CH719982A2 - POWER CONVERSION DEVICE AND POWER CONTROL DEVICE - Google Patents

Abstract

The invention relates to a power control device (2), which has an electrical quantity measuring unit (2a) which is configured to measure an electrical quantity of the electrical circuit, a command value calculation unit (2c) which is configured to calculate a control command value for the power converter (1) based on the electrical quantity, a phase calculation unit (2b) which is configured to determine a phase of the electrical quantity, a phase adjustment unit (11) which is configured to determine a phase of the electrical quantity Size adjusted and a control signal generating unit (15) configured to generate a control signal using a signal indicating a difference between before and after the adjustment of the phase, the generated signal for controlling an active power command value, to be given to the power control device (2), or a voltage command value or current command value to be given to the command value calculation unit (2c).

Description

AREA

[0001] The embodiments described herein generally relate to a power conversion device and a power control device.

BACKGROUND

[0002] Currently, the frequency adjustment of a power grid system is mainly carried out by the power control of a thermal power plant or a hydroelectric power plant.

The temporary frequency fluctuation before the power control of a thermal power plant or a hydroelectric power plant is suppressed by a sluggish response of a rotating machine such as a synchronous generator. In charging/discharging systems that use renewable energy such as solar and wind energy, the output fluctuates with a change in the natural environment. In order to suppress frequency fluctuations, frequency adjustment is used in practice by the charge/discharge control of a battery storage system.

A power conversion device (including a control device) used in a battery system for frequency adjustment measures a frequency of a circuit, obtains an input/output command value corresponding to the frequency, and controls the input/output of the power conversion device according to the command value. In addition, the power conversion device measures a voltage phase of the electrical circuit, determines a control phase, and controls input and output according to a command value. In a case where the voltage phase changes due to a frequency change or the like of the circuit, the control phase follows the voltage phase of the circuit, and the control device controls input and output according to the following control phase. Therefore, the power conversion device can stably control the input and output according to the command value even if the voltage phase of the electric circuit changes.

In a power plant using a synchronous generator such as thermal or hydraulic power generation, or a charging/discharging device such as a storage battery, in a case where the frequency of a grid system changes, the power of a driving motor controlled by a regulator-free function, and frequency fluctuation is suppressed. Regarding a transient frequency fluctuation and a voltage phase change, before the power of the prime mover changes, the power of the synchronous generator changes due to the inertia of the synchronous generator, and the transient frequency fluctuation is suppressed. That is, a power plant using a synchronous generator or a charging/discharging device such as a storage battery has a function of suppressing a frequency fluctuation through a sluggish response.

On the other hand, in wind power and solar power generation, the output command value and power fluctuate according to the fluctuations of wind speed and solar irradiation, which causes the frequency fluctuations of the grid. In addition, a power conversion device used for wind power generation, solar power generation, fuel cell system, battery storage system, etc. is a stationary device and does not have inertia like the synchronous generator. Furthermore, since these power conversion devices control the output and/or the input according to the command value, it is not possible to suppress the transient frequency fluctuation.

In a case when the number of charging/discharging devices connected to a grid system via a power conversion device such as wind or solar power generation increases and the ratio of power plants using a synchronous generator such as thermal or hydraulic Energy generation, or charging/discharging devices (inertial charging/discharging devices), such as a storage battery, decreases, there is a concern that the inertia of the entire grid system decreases and the frequency fluctuation of the grid system increases. Therefore, there is a need for a power conversion device that provides transient frequency fluctuation suppression equivalent to that of a power plant with a synchronous generator or a charge/discharge device such as a storage battery.

[0008] Controlling a virtual synchronous generator has been proposed as a method for realizing such a power conversion device. In this control, the control device of the power conversion device includes a calculation unit that simulates the characteristics of the synchronous generator and controls the output of the power conversion device based on the calculation result to simulate the output of the synchronous generator.

The control of the virtual synchronous generator requires complicated calculation and has the problem of causing a time delay in the calculation. Furthermore, since the output of the power conversion device behaves differently depending on a function and a constant used for calculation, in a case where a plurality of power conversion devices are connected to the same system, interference occurs in the control of each power conversion device, which is disadvantageous can affect the network system.

For this reason, it is desirable to provide a power conversion device and a power control device capable of changing an output and/or an input of a charger/discharger according to a transient frequency fluctuation and voltage phase variation of a system in order to control the frequency fluctuation of the system to suppress.

SUMMARY

According to one aspect of the invention, there is provided a power control device (2) which controls a power converter (1) connected to an AC electrical circuit, the power control device (2) comprising: an electrical quantity measuring unit (2a ), which is configured to measure an electrical quantity of the electrical circuit; a command value calculation unit (2c) configured to obtain a control command value for the power converter (1) based on the electrical quantity measured by the electrical quantity measuring unit (2a); a phase calculation unit (2b) configured to obtain a phase of the electrical quantity measured by the electrical quantity measuring unit (2a); a phase adjustment unit (11) configured to adjust a phase of the electrical quantity determined by the phase calculation unit (2b), and a control signal generating unit (15) configured to generate a control signal using a signal , which indicates a difference between before and after the adjustment of the phase adjusted by the phase adjustment unit (11), a signal generated by the control signal generating unit (15) for controlling an active power command value to be given to the power control device (2). , for controlling a voltage command value to be given to the command value calculation unit (2c), or for controlling a current command value to be given to the command value calculation unit (2c).

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a first embodiment (a situation in which a system frequency is stable). FIG. 2 is a conceptual diagram showing an example of a configuration of the charger/discharger with the power conversion device according to the first embodiment (a situation in which the system frequency decreases). FIG. 3 is a conceptual diagram showing an example of a configuration of the charger/discharger with the power conversion device according to the first embodiment (a situation in which the system frequency increases). FIG. 4 is a conceptual diagram showing in a simplified manner an example of a configuration of a charger/discharger with a power conversion device according to a related method (a situation in which a system frequency is stable). FIG. 5 is a conceptual diagram showing in a simplified manner an example of a configuration of the charger/discharger with the power conversion device according to the related art (a situation in which the system frequency decreases). FIG. 6 is a conceptual diagram showing in a simplified manner an example of a configuration of the charger/discharger with the power conversion device according to the related art (a situation in which the system frequency increases). FIG. 7A is a flowchart showing an example of the operation of the power control device according to the first embodiment. FIG. 7B is a diagram for explaining a difference in effect between the same embodiment and the related art. FIG. 8 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a second embodiment (a situation in which a system frequency is stable). 9 is a conceptual diagram showing an example of a configuration of the charger/discharger with the power conversion device according to the second embodiment (a situation in which the system frequency drops). FIG. 10 is a conceptual diagram showing an example of a configuration of the charger/discharger with the power conversion device according to the second embodiment (a situation in which the system frequency increases). FIG. 11 is a flowchart showing an example of the operation of the power control device according to the second embodiment. FIG. 12 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a third embodiment. FIG. 13 is a flowchart showing an example of the operation of the power control device according to the third embodiment. FIG. 14 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a fourth embodiment. FIG. 15 is a flowchart showing an example of the operation of the power control device according to the fourth embodiment. FIG. 16 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a fifth embodiment. FIG. 17 is a flowchart showing an example of the operation of the power control device according to the fifth embodiment. FIG. 18A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a sixth-1 embodiment. 18B is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a sixth-2 embodiment. FIG. 18C is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a sixth-3 embodiment. FIG. 18D is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a sixth-4 embodiment. FIG. 18E is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a sixth embodiment. FIG. 18F is a diagram showing an example of the functional configuration of a phase adjustment unit included in a power control device according to Embodiments 6-1, 6-2, 6-3, 6-4 and 6-5. FIG. 19A is a flowchart showing an example of the operation of the power control device according to Embodiment 6-1. FIG. 19B is a flowchart showing an example of the operation of the power control device according to Embodiment 6-2. FIG. 19C is a flowchart showing an example of the operation of the power control device according to Embodiment 6-3. FIG. 19D is a flowchart showing an example of the operation of the power control device according to Embodiment 6-4. FIG. 19E is a flowchart showing an example of the operation of the power control device according to Embodiment 6-5. FIG. 20A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-1. FIG. 20B is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-2. FIG. 20C is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-3. FIG. 20D is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-4. FIG. 20E is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-5. FIG. 20F is a diagram showing an example of a functional configuration of a phase adjustment unit included in a power control device according to Embodiments 7-1, 7-2, 7-3, 7-4 and 7-5. FIG. 21A is a flowchart showing an example of the operation of the power control device according to Embodiment 7-1. FIG. 21B is a flowchart showing an example of the operation of the power control device according to Embodiment 7-2. FIG. 21C is a flowchart showing an example of the operation of the power control device according to Embodiment 7-3. FIG. 21D is a flowchart showing an example of the operation of the power control device according to Embodiment 7-4. FIG. 21E is a flowchart showing an example of the operation of the power control device according to Embodiment 7-5. FIG. 22A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to an eighth embodiment. FIG. 22B is a diagram showing an example of a functional configuration of each phase adjustment unit included in a power control device according to the eighth embodiment. FIG. 23A is a flowchart showing an example (part 1) of the operation of the power control device according to the eighth embodiment. FIG. 23B is a flowchart showing an example (part 2) of the operation of the power control device according to the eighth embodiment. FIG. 23C is a flowchart showing an example (part 3) of the operation of the power control device according to the eighth embodiment. FIG. 23D is a flowchart showing an example (part 4) of the operation of the power control device according to the eighth embodiment. FIG. 23E is a flowchart showing an example (part 5) of the operation of the power control device according to the eighth embodiment. FIG. 24A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 9-1. FIG. 24B is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 9-2. FIG. 24C is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 9-3. FIG. 25A is a flowchart showing an example of the operation of the power conversion device according to Embodiment 9-1. FIG. 25B is a flowchart showing an example of the operation of the power conversion device according to Embodiment 9-2. FIG. 25C is a flowchart showing an example of the operation of the power conversion device according to Embodiment 9-3. FIG. 26A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 10-1. FIG. 26B is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 10-2. FIG. 26C is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 10-3. 26D is a diagram showing an example of a functional configuration of a comparison/determination unit included in the power conversion device 102 according to the tenth-1, the tenth-2 and the tenth-3 embodiments. FIG. 27A is a flowchart showing an example of the operation of the power conversion device according to Embodiment 10-1. FIG. 27B is a flowchart showing an example of the operation of the power conversion device according to Embodiment 10-2. FIG. 27C is a flowchart showing an example of the operation of the power conversion device according to Embodiment 10-3. FIG. 28 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to an eleventh embodiment. FIG. 29 is a flowchart showing an example of operation of a power control device according to the eleventh embodiment. FIG. 30 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a twelfth embodiment. FIG. 31 is a flowchart showing an example of operation of a power control device according to the twelfth embodiment. FIG. 32 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to a thirteenth embodiment. FIG. 33 is a diagram for explaining a specific calculation example (part 1) in the main part of the power control device 2 described in the first embodiment. FIG. 34 is a diagram for explaining a specific calculation example (part 2) in the main part of the power control device 2 described in the first embodiment. FIG. 35A is a diagram for explaining a specific calculation example 1-1 used for a phase adjustment unit 11 in FIG. 33 or a phase adjustment unit 11 in FIG. 34 applies. FIG. 35B is a diagram for explaining a specific calculation example 1-2 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 36A is a diagram for explaining a specific calculation example 2-1 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 36B is a diagram for explaining a specific calculation example 2-2 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 37A is a diagram for explaining a specific calculation example 2-3 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 37B is a diagram for explaining a specific calculation example 2-4 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 38A is a diagram for explaining a specific calculation example 2-5 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 38B is a diagram for explaining a specific calculation example 2-6 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 39A is a diagram for explaining a specific calculation example 3-1 applied to the phase adjustment unit 11 in FIG. 33 is applicable. FIG. 39B is a diagram for explaining a specific calculation example 3-2 applied to the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 40A is a diagram for explaining a specific calculation example 4-1 applied to the phase adjustment unit 11 in FIG. 33 is applicable. FIG. 40B is a diagram for explaining a specific calculation example 4-2 applied to the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 41A is a diagram for explaining a specific calculation example 4-3 applied to the phase adjustment unit 11 in FIG. 33 is applicable. FIG. 41B is a diagram for explaining a specific calculation example 4-4 applied to the phase adjustment unit 11 in FIG. 34 is applicable. FIG. 42 is a diagram for explaining a specific calculation example 5 applied to the phase adjustment unit 11 in FIG. 33 is applicable. FIG. 43A is a diagram for explaining a specific calculation example 6-1 applied to the phase adjustment unit 11 in FIG. 33 is applicable. FIG. 43B is a diagram for explaining a specific calculation example 6-2 applied to the phase adjustment unit 11 in FIG. 33 is applicable. FIG. 44A is a diagram for explaining a specific calculation example 7-1 applied to the phase adjustment unit 11 in FIG. 33 is applicable. FIG. 44B is a diagram for explaining a specific calculation example 7-2 applied to the phase adjustment unit 11 in FIG. 34 is applicable. 45A is a diagram for explaining a case where an inertia simulation control signal is made from a difference between an output of a phase adjustment unit 13 and an output of a voltage phase calculation unit 12 as a specific example of an inertia simulation control signal generating unit 15 in FIGS. 28, 30 and 32 is generated. 45B is a diagram for explaining a case where an inertia simulation control signal is generated from a phase difference obtained in a calculation process of the phase adjustment unit 13 as a specific example of the inertia simulation control signal generation unit 15 in FIGS. 28, 30 and 32 is produced.

DETAILED DESCRIPTION

The embodiments are described below with reference to the drawings.

First embodiment

[0014] First, a first embodiment will be described.

[0015] FIG. 1 to 3 are conceptual diagrams showing an example of a configuration of a charger/discharger with a power conversion device according to the first embodiment. FIG. 1 shows a situation where the system frequency is stable in the first embodiment, FIG. 2 shows a situation where the system frequency decreases in the same embodiment, and FIG. 3 shows a situation where the system frequency increases in the same embodiment. 1 to 3, the vectors A0, A1, A2, A3 and A10, which indicate the phase angles of the signals in the respective components, are shown schematically in rotating coordinate systems. The phase angle is 0° when the vector is oriented to the right on the rotating coordinate system. If the vector rotates clockwise, the phase angle becomes a minus value; if the vector rotates counterclockwise, the phase angle becomes a plus value.

[0016] The ones shown in FIGS. 1 to 3 shown charging/discharging device is, for example, a charging/discharging device of a battery storage system.

In the present embodiment, an example of the charging/discharging device of the “battery storage system” is described, but it is also possible to use these as well as other types of charging/discharging devices (charging/discharging devices such as wind turbines, solar systems and fuel cell systems) instead the loading/unloading device and the loading device. It is considered that the present invention is not limited to the charging/discharging device even in the other embodiments described later. In the present embodiment, an example of a case where the charging/discharging device is connected to a “grid system” is described, but the charging/discharging device may be connected to another AC circuit (e.g., a power distribution system, a power supply circuit, etc.) instead of the grid system the like). Further, in the present embodiment, an example of a case in which the phase of “voltage” is adjusted, but the phase is not limited to the voltage, and the phase of other electrical quantity (e.g., power, current, and the like) may be described be adjusted. The measured value used for phase adjustment is not limited to the value of the voltage of the network, but can also be another electrical quantity (e.g. power, current and the like). The value used for the adjustment calculation may be a value of a trigonometric phase function (e.g. cosθ, sinθ) or a phase change amount (Δθ).

[0018] The ones shown in FIGS. 1 to 3 includes as basic components a main transformer M, a parallel power switch CB as well as a power converter 1 and a power control device 2, which form a power converter device 3 as a stationary device.

The power converter 1 is connected to a network system S via a parallel power switch CB and the main transformer M. Of the circuits connecting the power converter 1 and the power system S, a measuring transformer VT is installed in the circuit connecting the power system S and the main transformer M, and a current transformer CT1 is installed in the circuit connecting the output side of the power converter 1 and connects the parallel circuit breaker CB. The measuring transformer VT outputs a voltage signal that corresponds to the voltage (system voltage) of the network system S. The power converter CT1 outputs a current signal corresponding to an input/output current of the power converter 1.

A storage battery B is connected to the power converter 1. The power converter 1 supplies power to and from the grid system S, and charges and discharges the storage battery B in accordance with signals received from the power control device 2 side via a later-described U-phase signal generating unit 5A, V-phase signal generating unit 5B, and W-phase signal generating unit 5C can be given. For example, when a phase difference (difference in phase angle) between the system voltage and the output voltage of the power converter 1 is 9, the output (discharge) of the active power of the power converter 1 is a value proportional to sinθ. As θ increases, the performance of the power converter 1 increases.

The power control device 2 receives various signals described later, generates a command value for the power converter 1, generates a signal corresponding to the command value, and outputs the signal to the power converter 1. The power control device 2 sets the phase of the output voltage of the power converter 1 to be ahead of the phase of the system voltage when the output (discharge) of the power converter 1 occurs, and sets the phase of the output voltage of the power converter 1 to be behind Phase of the system voltage is when the input (charging) occurs.

The charging/discharging device is equipped with an active power and reactive power calculation unit 201, an active power control command value calculation unit 202 and a reactive power/voltage control command value calculation unit 203.

The active power and reactive power calculation unit 201 receives a voltage signal transmitted from the measurement transformer VT, which outputs a voltage signal corresponding to the voltage (system voltage) of the grid system S, receives a current signal transmitted from a current transformer CT , which outputs a current signal corresponding to the output current of the power converter 1, and calculates and outputs an active power measurement value and a reactive power/voltage measurement value.

The active power control command value calculation unit 202 receives an automatic frequency control command value (AFC command value) and a controller clearance signal transmitted from the higher-level control system, generates an active power control command value from the automatic frequency control command value and the controller clearance signal and outputs the active power control command value .

The reactive power/voltage control command value calculation unit 203 receives a voltage command and a reactive power command transmitted from a higher control system, calculates a reactive power/voltage control command value from the voltage command and the reactive power command, and outputs the reactive power/voltage control command value .

The individual signals output from the active power and reactive power calculation unit 201, the active power control command value calculation unit 202 and the reactive power/voltage control command value calculation unit 203 are transmitted to the power control device 2.

The power control device 2 includes a system voltage measurement unit (electrical quantity measurement unit) 2a, a phase calculation unit 2b, a voltage command value calculation unit 2c, a two-phase-three-phase conversion unit 2d, and a calculation unit 2e, and further includes the phase adjustment unit 11 unique to the present embodiment In order to generate a signal that is given to the voltage command value calculation unit 2c, the power control device 2 further includes a calculation unit 3a, a d-axis current command value calculation unit 3b, a calculation unit 3c, a calculation unit 3d, a q-axis current command value - Calculation unit 3e and a calculation unit 3f and also includes a power converter current measuring unit 2f and a power converter current dq conversion unit 2g.

The power converter current measurement unit 2f receives the current signal output from the power converter CT1, measures the AC waveform of the current of the power converter 1, and outputs the measured value (current converter current measurement value).

The power converter current dq conversion unit 2g receives the power converter current measurement value output from the power converter current measurement unit 2f and performs dq conversion to obtain measured values of the d-axis current and the q-axis current (d-axis Current measurement value and q-axis current measurement value) to receive and output.

The calculation unit 3a receives the active power control command value output from the active power control command value calculation unit 202, receives the active power measurement value output from the active power and reactive power calculation unit 201, and outputs a difference (active power deviation) between the two.

The d-axis current command value calculation unit 3b receives the difference output from the calculation unit 3a, calculates a d-axis current command value from the difference signal, and outputs the d-axis current command value.

The calculation unit 3c receives the d-axis current command value output from the d-axis current command value calculation unit 3b, receives the d-axis current measurement value output from the power converter current dq conversion unit 2g, and outputs a difference (d-axis current deviation) between the two.

The calculation unit 3d receives the reactive power/voltage control command value output from the reactive power/voltage control command value calculation unit 203, receives the active power and the reactive power/voltage measurement value output from the active power and reactive power calculation unit 201 and outputs a difference (reactive power/voltage deviation) between the two values.

The q-axis current command value calculation unit 3e receives the difference signal output from the calculation unit 3d, calculates a q-axis current command value from the difference signal, and outputs the q-axis current command value.

The calculation unit 3f receives the q-axis current command value output from the q-axis current command value calculation unit 3e, receives the q-axis current measurement value output from the power converter current dq conversion unit 2g, and outputs a difference (q-axis current deviation) between the two.

The system voltage measuring unit 2a receives a voltage signal supplied from the transducer VT and measures an AC voltage waveform of the system voltage from the signal. For example, the system voltage measuring unit 2a obtains a numerical value of a three-phase voltage waveform (sine wave) from the voltage signal supplied from the transducer VT and outputs the obtained value.

The phase calculation unit 2b determines the phase of the AC voltage waveform of the voltage measured by the system voltage measuring unit 2a. For example, the phase calculation unit 2b performs three-phase-two-phase conversion on a three-phase voltage waveform of the voltage and obtains and outputs a phase value. In this example, the phase is determined by three-phase to two-phase conversion. Alternatively, the phase can also be determined by a method other than three-phase-two-phase conversion. For example, the phase can be determined using a PLL (phase-locked loop) calculation.

The phase adjustment unit 11 adjusts the phase of the voltage obtained from the phase calculation unit 2b as necessary. For example, the phase adjustment unit 11 obtains and outputs a value obtained by applying the calculation of the first-order delay of the angular velocity to the phase adjustment (for example, a phase value (θlag) obtained by adjusting a difference (ωdif) between a value (ω). Angular velocity of the output (9) of the phase calculation unit 2b and a value (ωlag) of a first order delay of the angular velocity is obtained by multiplying a coefficient (K) and the time (Δt). For example, the phase adjustment unit 11 performs the following calculation to obtain the adjusted phase value (θlag). ω = θ/Δt (Δt: sampling period) ωlag = ω / (1 + T s) (T: first-order delay time constant, s: Laplace operator) ωdif = ωlag - ω θlag = K · ωdif · Δt

Multiplication by the coefficient and/or Δt is not absolutely necessary. If the value of the adjusted phase is determined using the phase change amount (e.g. Δθ) instead of the angular velocity, the multiplication by Δt is not necessary. Furthermore, in a case where a dimensionless number such as a pu value is used for various numerical values, in a case where the value of Δt is constant, in a case where the coefficient is added together with the value of Δt is multiplied, or the like, the multiplication of the coefficient and / or Δt is omitted.

The voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase of the voltage adjusted by the phase adjustment unit 11. The voltage command value calculation unit 2c obtains a voltage command value, for example, from the phase of the voltage adjusted by the phase adjustment unit 11 and the d-axis current deviation and the q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

The two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion of the control command value obtained from the voltage command value calculation unit 2c to generate an AC waveform of the control command value. For example, the two-phase-three-phase conversion unit 2d converts the voltage command value obtained from the voltage command value calculation unit 2c into a command value of a three-phase voltage waveform and outputs the command value (for example, determines and outputs a value obtained by converting the α-axis voltage command value and of the β-axis voltage command value in three-phase AC). The command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d is sent to the U-phase signal generation unit 5A, the V-phase signal generation unit 5B and the W-phase signal generation unit 5C for each of the U, V and W Phases sent.

The U-phase signal generation unit 5A, the V-phase signal generation unit 5B and the W-phase signal generation unit 5C generate U-phase, V-phase and W-phase signals from the command value of the three-phase AC waveform, which from the two-phase-three-phase conversion unit 2d, or from the carrier waveform, and supply the generated signals to the power converter 1 to control input/output of the power converter 1.

The individual functions constituting such a power control device 2 may be implemented as hardware, or part or all of the functions may be implemented as software (a program to be implemented by a computer).

Next, a difference between the power conversion device 3 of the present embodiment and a prior art power conversion device 3 will be described.

[0045] FIG. 4 to 6 are conceptual diagrams showing in a simplified manner an example of a configuration of a charger/discharger with a power conversion device according to a related method. FIG. 4 shows a situation in which the system frequency is stable in the related art, FIG. 5 shows a situation in which the system frequency decreases in the related art, and FIG. 6 shows a situation where the system frequency increases in the related art. In the FIGS. 4 to 6, vectors A0, A1, A3 and A10, which indicate the phase angles of the signals in the respective components, are shown schematically in rotating coordinate systems. The phase angle is 0° when the vector is oriented to the right on the rotating coordinate system. If the vector rotates clockwise, the phase angle becomes a minus value; if the vector rotates counterclockwise, the phase angle becomes a plus value. In the FIGS. 4 to 6, the same reference numbers are assigned to the same elements as in the FIGS. 1 to 3.

In the present embodiment, the phase adjustment unit 11 is as shown in FIGS. 1 to 3 installed, while in the prior art the phase adjustment unit 11 is not as shown in FIGS. 4 to 6 is installed. Therefore, the present embodiment and the related art have different functions as described below.

- During unloading

The function when the power conversion device 3 is discharged will be explained with reference to FIG. 1 to 3 and FIG. 4 to 6 while comparing the present embodiment with the prior art.

In the present embodiment, the phase angle of the voltage signal of the network S at a stable system frequency is as shown in FIG. 1, for example 0° as indicated by vector A0. At this time, the phase angle of the input signal of the phase adjustment unit 11 (the output signal of the phase calculation unit 2b) is 0°, as indicated by the vector A1, and the phase angle of the output signal of the phase adjustment unit 11 is also 0°, as indicated by the vector A2.

This is because the output signal of the phase adjustment unit 11 is not affected by the first-order delay calculation and thus the input signal and the output signal of the phase adjustment unit 11 have the same phase angle value. At this time, the phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g., 30°) advanced by an angle (e.g., 30°) from the value (e.g., 0°) of the phase angle output from the phase adjustment unit 11, which is obtained by the tax calculation specified by the vector A3. Accordingly, the phase angle of the output voltage of the power converter 1 is also 30°, as indicated by the vector A10. Therefore, the phase difference φ between the system voltage and the output voltage of the power converter 1 is 30°, and the active power proportional to sin (30°) is output (discharged) by the power converter 1.

In the present embodiment, it is assumed that the phase angle of the voltage signal of the network S with decreasing system frequency, as shown in FIGURE 2, is, for example, -30°, as indicated by the vector A0.

[0051] At this time, the phase angle of the input signal of the phase adjustment unit 11 (the output signal of the phase calculation unit 2b) is also -30°, as indicated by the vector A1, but the phase angle of the output signal of the phase adjustment unit 11 is not the same as the vector A1, but is, for example, -15°, as indicated by vector A2 (the amount of change in phase angle is smaller in vector A2 than in vector A1).

This is because the change in the output signal of the phase adjustment unit 11 is a response adjusted by a function that uses the first-order delay of the angular velocity with respect to the change in the input signal of the phase adjustment unit 11. In a case where the change in the input signal of the phase adjustment unit 11 stops, the change amount of the output signal of the phase adjustment unit 11 is smaller than the change amount of the input signal. Therefore, the phase angle output from the phase adjustment unit 11 is, for example, -15°, as indicated by the vector A2. At this time, the phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g., 15°) shifted from the phase angle of -15° by an angle (e.g., 30°) obtained through the control calculation , as indicated by vector A3. Accordingly, the phase angle of the output voltage of the power converter 1 is also 15°, as indicated by the vector A10. Therefore, the phase difference ϕ between the phase (-30°) of the system voltage and the phase (15°) of the output voltage of the power converter 1 is 45°, and the active power proportional to sin (45°) is output (discharged) by the power converter 1.

[0053] Since the phase difference ϕ (= 45°) when the system frequency decreases is greater than the phase difference ϕ (= 30°) when the system frequency is stable, the active power output of the power converter 1 is greater when the system frequency decreases than when the system frequency is stable. That is, in a case where the phase of the system voltage changes with the decrease in the system frequency, the power converter 1 increases the output (discharged) power and suppresses the decrease in the system frequency.

In the present embodiment, as the system frequency increases, the phases of the system voltage, the output of the phase calculation unit 2b, the output of the phase adjustment unit 11, the output of the voltage command value calculation unit 2c and the output voltage of the power converter 1 change in the opposite direction to the case. in which the system frequency drops. That is, in the present embodiment, the phase difference φ when the system frequency increases is smaller than the phase difference φ when the system frequency is stable due to the above-described function of the phase adjustment unit 11, and the power output (discharged) from the power converter 1 is smaller as the system frequency increases , as if the system frequency is stable.

In the present embodiment, it is assumed that the phase angle of the voltage signal of the network S with an increase in the system frequency, as shown in Fig. 3, is, for example, 30°, as indicated by the vector A0.

[0056] At this time, the phase angle of the input signal of the phase adjustment unit 11 (the output signal of the phase calculation unit 2b) is also 30° as indicated by the vector A1, but the phase angle of the output signal of the phase adjustment unit 11 is not the same as the vector A1 but is e.g. 15°, as indicated by vector A2 (the amount of change in phase angle is smaller in vector A2 than in vector A1).

This is because the change in the output signal of the phase adjustment unit 11 is a response adjusted by a function that uses the first-order delay of the angular velocity with respect to the change in the input signal of the phase adjustment unit 11. In a case where the change in the input signal of the phase adjustment unit 11 stops, the change amount of the output signal of the phase adjustment unit 11 is smaller than the change amount of the input signal. Therefore, the phase angle output from the phase adjustment unit 11 is, for example, 15°, as indicated by the vector A2.

[0058] At this time, the phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g., 45°) shifted from the phase angle 15° (A0) of the system voltage by an angle (e.g., 30°) determined by the tax calculation is obtained as indicated by the vector A3. Accordingly, the phase angle of the output voltage of the power converter 1 is also 45°, as indicated by the vector A10. Therefore, the phase difference ϕ between the phase (30°) of the system voltage and the phase (45°) of the output voltage of the power converter 1 is 15°, and the active power proportional to sin (15°) is output (discharged) by the power converter 1.

[0059] Since the phase difference ϕ (= 15°) when the system frequency increases is smaller than the phase difference ϕ (= 30°) when the system frequency is stable, the active power output of the power converter 1 is smaller when the system frequency increases than when the system frequency is stable. That is, in a case where the phase of the power voltage changes with the increase in the system frequency, the power converter 1 reduces the output (discharged) power and suppresses the increase in the system frequency.

On the other hand, when the system frequency is stable in the prior art, the phase angles indicated by the vectors A0, A1, A3 and A10 are as shown in FIG. 4, the same as that shown in FIG. 1 described embodiment when the system frequency is stable. However, in the related art, when the system frequency decreases, as shown in FIG. 5, since there is no phase adjustment unit 11, the phase angles indicated by vectors A1, A3 and A10 are different from the phase angles when the system frequency is in the range shown in FIG. 2 described embodiment decreases.

In the prior art, it is assumed that the phase angle of the voltage signal of the network S is, for example, -30° as the system frequency decreases, as shown in FIG. 5, as indicated by the vector A0.

At this time, the phase angle output from the phase calculation unit 2b is -30° as indicated by the vector A1. The phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g., 30°) advanced from the phase angle of -30° by an angle (e.g., 0°) determined by the control calculation indicated by the vector A3 is received. Accordingly, the phase angle of the output voltage of the power converter 1 is also 0°, as indicated by the vector A10. Therefore, the phase difference ϕ between the phase (-30°) of the system voltage and the phase (0°) of the output voltage of the power converter 1 is 30°, and the active power proportional to sin (30°) is output (discharged) from the power converter 1.

That is, in the prior art, even if the phase of the system voltage changes, the phase in the power control device 2 follows the phase of the system voltage when the system frequency decreases. Therefore, the phase difference ϕ between the system voltage and the output voltage of the power converter 1 is the same as that at a stable system frequency, and the power output (discharged) from the power converter 1 is not changed. This means that the drop in system frequency is not suppressed.

In the prior art it is assumed that the phase angle of the voltage signal of the network S increases as the system frequency increases, as in FIG. 6, e.g. is 30°, as indicated by the vector A0.

At this time, the phase angle output from the phase calculation unit 2b is 30° as indicated by the vector A1. The phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g., 60°) shifted from the phase angle of 30° by an angle (e.g., 30°) obtained by the control calculation indicated by the vector A3 becomes. Accordingly, the phase angle of the output voltage of the power converter 1 is also 60°, as indicated by the vector A10. Therefore, the phase difference φ between the system voltage and the output voltage of the power converter 1 is 30°, and the active power proportional to sin (30°) is output (discharged) by the power converter 1.

That is, in the prior art, the phase in the power control device 2 follows the phase of the system voltage as the system frequency increases, even if the phase of the system voltage changes. Therefore, the phase difference ϕ between the system voltage and the output voltage of the power converter 1 is the same as that at a stable system frequency, and the power output (discharged) from the power converter 1 is not changed. This means that an increase in the system frequency is not suppressed.

- During charging

Next, the function when the power conversion device 3 is charged will be described, comparing the present embodiment with the prior art. There is no illustration here.

In a case where the power conversion device 3 is charged, the relationship between the phase of the system voltage and the phase shift and delay of the output voltage of the power conversion device 3 is opposite to that in discharging.

That is, in the present embodiment, the phase difference φ when the system frequency decreases is smaller than the phase difference φ when the system frequency is stable due to the function of the phase adjustment unit 11 described above, and the (charged) power supplied to the power converter 1 when the system frequency decreases is smaller than at a stable system frequency. That is, in a case where the phase of the system voltage changes with the decrease in the system frequency, the power converter 1 reduces the input (charged) power and suppresses the decrease in the system frequency.

[0070] Furthermore, in the present embodiment, the phase difference φ when the system frequency rises is larger than the phase difference φ when the system frequency is stable due to the above-described function of the phase adjustment unit 11, and the power fed (charged) into the power converter 1 is at a rise the system frequency is greater than at a stable system frequency. That is, in a case where the phase of the system voltage changes with the rise of the system frequency, the power converter 1 increases the power to be input (charged) and suppresses the rise of the system frequency.

[0071] On the other hand, in the power control device 2, even if the phase of the system voltage changes when the system frequency decreases, the phase follows the phase of the system voltage in the prior art. Therefore, the phase difference φ between the system voltage and the output voltage of the power converter 1 is the same as when the system frequency is stable, and the power supplied (charged) by the power converter 1 is not changed. This means that a drop in the system frequency is not suppressed.

In the prior art, the phase in the power control device 2 follows the phase of the system voltage even if the system frequency increases and the phase of the system voltage changes. Therefore, the phase difference φ between the system voltage and the output voltage of the power converter 1 is the same as when the system frequency is stable, and the power supplied (charged) by the power converter 1 is not changed. This means that an increase in the system frequency is not suppressed.

In the above example, a case has been exemplified where the voltage waveform (sine wave) is subjected to three-phase-to-two-phase conversion to obtain the voltage phase, and the calculation of the first-order delay of the angular velocity is used for the phase adjustment. However, a phase of an electrical quantity (power, current, etc.) other than voltage can also be used. In the above example, a case in which the phase is obtained by three-phase-two-phase conversion has been described, but the phase may also be obtained by a method other than three-phase-two-phase conversion. For example, the phase can be determined using a PLL (phase-locked loop) calculation. In addition, a calculation (function) other than the first-order delay calculation may be used for the phase adjustment calculation. For example, a PLL calculation or a second-order delay calculation can be used in which the tracking speed is adjusted, or the same effect as the first-order delay calculation can be achieved by fixing the phase value for a certain period of time and using a function that the phase of the system follows after the certain period of time has elapsed. Instead of the phase, a value of a trigonometric phase function (e.g. cosθ, sinθ) or an amount of change (Δθ) can also be determined and used for various calculations.

Next, an example of the operation of the power control device 2 according to the first embodiment will be described with reference to the flowchart of FIG. 7A.

[0075] In the power control device 2, the system voltage measuring unit 2a receives the voltage signal supplied from the transducer VT and measures the AC waveform of the system voltage from the signal (step S1). For example, the system voltage measuring unit 2a obtains a numerical value of a three-phase voltage waveform (sine wave) from the voltage signal supplied from the transducer VT and outputs the obtained value.

[0076] Next, the phase calculation unit 2b determines the phase of the AC waveform of the voltage measured by the system voltage measuring unit 2a (step S2). For example, the phase calculation unit 2b performs three-phase-two-phase conversion on a three-phase voltage waveform of the voltage and obtains and outputs a phase value.

[0077] Next, the phase adjustment unit 11 adjusts the phase of the voltage obtained from the phase calculation unit 2b (step S3A). For example, the phase adjusting unit 11 determines and outputs a value obtained by applying the calculation of the first order delay of the angular velocity to the adjustment of the phase (for example, the phase adjusted by using a value obtained by multiplying the difference between the value of the angular velocity of the output of the phase calculation unit 2b and the value of the first order delay of the angular velocity with a coefficient as required).

[0078] Next, the voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase adjusted by the phase adjustment unit 11 (step S3B). The voltage command value calculation unit 2c obtains a voltage command value, for example, from the phase adjusted by the phase adjustment unit 11 and the d-axis current deviation and q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

The d-axis current deviation and the q-axis current deviation used by the voltage command value calculation unit 2c are obtained from the power converter current measurement unit 2f, the power converter current dq conversion unit 2g, the calculation unit 3a, the d Axis current command value calculation unit 3b, the calculation unit 3c, the calculation unit 3d, the q-axis current command value calculation unit 3e, and the calculation unit 3f which performs calculation processing and the like based on the active power measurement value sent from the active power and reactive power calculation unit 201 and reactive power measurement value, the active power control command value sent from the active power control command value calculation unit 202, the reactive power/voltage control command value sent from the reactive power/voltage control command value calculation unit 203 and the current signal sent from the power converter CT1.

[0080] Next, the two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion of the control command value obtained from the voltage command value calculation unit 2c to generate an AC waveform of the control command value (step S4). For example, the two-phase-three-phase conversion unit 2d converts the voltage command value obtained from the voltage command value calculation unit 2c into a command value of a three-phase voltage waveform and outputs the command value (for example, determines and outputs a value obtained by converting the α-axis voltage command value and of the β-axis voltage command value in three-phase AC).

The three-phase AC command value generated by the two-phase-three-phase conversion unit 2d is sent to the U-phase signal generation unit 5A, the V-phase signal generation unit 5B and the W-phase signal generation unit 5C for each of the U-phases, of V phases and W phases are sent, and U phase, V phase and W phase signals are generated. These signals are given to the power converter 1 to control the input/output of the power converter 1.

This has the consequence that, for example, in a case in which the power conversion device 3 is discharging, as the system frequency decreases, the phase difference ϕ between the system voltage and the output voltage of the power converter 1 increases and the power converter 1 increases the power to be output (discharged) and the Decrease in system frequency suppressed. On the other hand, if the system frequency increases, the phase difference ϕ between the mains voltage and the output voltage of the power converter 1 decreases, and the power converter 1 reduces the power to be output (discharged) and suppresses the increase in the system frequency.

[0083] Furthermore, in a case where the power conversion device 3 is charged, as the system frequency decreases, the phase difference φ between the system voltage and the output voltage of the power converter 1 decreases, and the power converter 1 reduces the power to be input (charged) and suppresses the decrease the system frequency. On the other hand, if the system frequency increases, the phase difference ϕ between the mains voltage and the output voltage of the power converter 1 increases, and the power converter 1 increases the (charged) power to be introduced and suppresses the increase in the system frequency.

[0084] According to the first embodiment, even if the input/output command value (active power control command value or the like) of the power conversion device 3 is constant, the phase adjusting unit 11 adjusts the phase of the voltage obtained from the phase calculation unit 2b when the phase of the electrical quantity such as the System voltage, due to a frequency fluctuation or the like of the AC electric circuit such as the power system S, fluctuates, so that the difference between the phase of the electric quantity (voltage, current, power and the like) input/output from the power conversion device 3 and the phase of the electrical quantity (voltage, current, power and the like) of the circuit such as the power system S can be changed, and the input/output of the power converter 1 can be changed.

This makes it possible to realize an operation (simulation of the sluggish response) similar to the sluggish response of the synchronous machine, and thus it is possible to suppress frequency fluctuations and oscillations of the power system, the electric circuit and the like, resulting in frequency stabilization of the power system , the electrical circuit and the like.

Here, an example of a change in the system voltage and the output of the power converter 1 and a change in the active power output from the power converter 1 to the grid system S in a case where the system frequency decreases is given with reference to the graph in FIG. 7B described. Here, an example of a case where the system frequency decreases is described, but in a case where the system frequency increases, the phase difference and the active power change in the opposite direction to the case where the system frequency decreases.

[0087] FIG. 7B(a) shows a waveform W1 of the system frequency, FIG. 7B(b) shows a waveform W2 of the phase difference between the mains voltage and the output voltage of the power converter 1, and FIG. 7B(c) shows a waveform W3 of the active power delivered by the power converter 1 to the network S.

[0088] In FIG. 7B(b) and 7B(c) are also a waveform W200 of the phase difference between the grid voltage and an output voltage of a general power conversion device (in a case where the phase difference is 0°) and a waveform W300 of the phase difference from the general power conversion device to the grid system S delivered active power (in a case in which the command value is 0), so that the behavior of the general power conversion device can also be detected.

For example, consider a case where the system frequency decreases from 50 Hz as shown by the waveform W1 in FIG. 7B(a). In a case where the system frequency decreases, the phase difference between the line voltage and the output voltage of the power converter 1 increases, as shown by the waveform W2 in FIG. 7B(b) due to the function of the phase adjustment unit 11 described above. In a case where the phase difference increases, the active power delivered from the power converter 1 to the grid system S increases, as shown by the waveform W3 in FIG. 7B(c), and the drop in system frequency is suppressed.

[0090] In a case where the decrease in the system frequency is suppressed and the system frequency becomes constant, the phase difference does not increase, as indicated by the waveform W2 of Fig. 7B(b), decreases, and quickly returns to the original value (Value before the system frequency decreases). Accordingly, as indicated by waveform W3 of Fig. 7B(c), the active power also does not increase, but decreases and quickly returns to the original value (value before the system frequency decreases).

[0091] That is, as the frequency decreases, the phase difference increases and the active power increases, and as the frequency becomes constant, the phase difference decreases and the active power decreases. This behavior is the same behavior as the sluggish response of the synchronous machine, in which the power increases with decreasing frequency and the phase difference decreases with constant frequency and the active power decreases.

[0092] On the other hand, in the general power conversion device, in a case where the system frequency decreases, the phase of the output voltage follows the system voltage, so that the phase difference between the system voltage and the output voltage of the power conversion device is constant (in the example of FIG. 7B(b) the phase difference is constant at 0°), as shown by waveform W200 of FIG. 7B(b). Since the phase difference is constant and the active power output from the power conversion device to the grid system S is constant (in the example of FIG. 7B(c), the phase difference is constant at 0°), as shown by the waveform W300 in FIG. 7B(c) is shown, this does not help suppress system frequency droop.

According to the present embodiment, it is possible to form the waveforms W2 and W3 with good response as shown in FIG. 7B(b) and 7B(c) shown. One reason for this is that the phase of the voltage measured by the system voltage measuring unit 2a is detected, and then the phase is adjusted using the result of calculating the first-order delay of the angular velocity. In a case where the calculation of the first-order delay is used for the sine waveform without detecting the phase, the influence of the first-order delay extends to components (amplitude and the like) other than the phase, and therefore it is difficult to to form a good waveform, as indicated by waveforms W2 and W3. Furthermore, in a case where the first-order delay calculation is used for the phase value instead of the angular velocity, a stationary difference is generated between the value before the first-order delay calculation and the value after the first-order delay calculation, even when the frequency is constant. Therefore, it is difficult to form a good waveform, as shown by waveforms W2 and W3.

As described above, according to the present embodiment, for example, in a case where the system frequency decreases, it is possible to increase the phase difference and increase the active power required to suppress the decrease, so that the system frequency can be stabilized early. In addition, after the system frequency is stabilized, the phase difference can be quickly and undisturbed returned to the original value, and the active power can be quickly and undisturbed returned to the original value. Therefore, after the system frequency is stabilized, the system frequency can be prevented from becoming unstable again. It goes without saying that when the system frequency increases, although the direction of behavior is different, the same functional effect can be achieved as when the system frequency decreases.

The above-described waveforms W2 and W3 can be applied to the calculation processing performed in the phase adjustment unit 11 (or in a phase adjustment unit 21, 32, 41 to 43 or 52 in any embodiment described later) by appropriately applying a phase adjustment function to a desired shape can be adjusted.

Second embodiment

Next, a second embodiment will be described. Below, description of parts common to the first embodiment will be omitted, and other parts will mainly be described.

[0097] FIG. 8 to 10 are conceptual diagrams showing an example of a configuration of a charger/discharger with a power conversion device according to the second embodiment. FIG. 8 shows a situation where a system frequency is stable in the same embodiment, FIG. 9 shows a situation where the system frequency decreases in the same embodiment, and FIG. 10 shows a situation where the system frequency increases in the same embodiment.

The second embodiment differs from the first embodiment in that a phase adjustment unit 21 is arranged to be inserted into a path connecting a voltage command value calculation unit 2c and a two-phase-three-phase conversion unit 2d. Since the phase adjustment unit 21 is used instead of the phase adjustment unit 11, the processing content and operation of the phase adjustment unit 21 are different from those of the phase adjustment unit 11 of the first embodiment.

The voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase of the voltage determined by a phase calculation unit 2b. The voltage command value calculation unit 2c determines a voltage command value, for example, from the phase of the voltage determined by the phase calculation unit 2b and the d-axis current deviation and q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

The phase adjustment unit 21 adjusts the phase of the voltage command value obtained from the voltage command value calculation unit 2c as necessary. For example, the phase adjustment unit 21 determines a value obtained by applying the first-order delay calculation to the phase adjustment (for example, the phase adjusted by using a value obtained by multiplying the difference between the value of the output angular velocity of the phase calculation unit 2b and the value of the first order deceleration of the angular velocity with a coefficient as required), adjusts the phase of the control command value (the output of the voltage command value calculation unit 2c) using the determined value and outputs the adjusted value.

The two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion of the control command value whose phase has been adjusted by the phase adjusting unit 21 to generate an AC waveform of the control command value. For example, the two-phase-three-phase conversion unit 2d converts the voltage command value whose phase has been adjusted by the phase adjustment unit 21 into a command value of a three-phase voltage waveform and outputs the command value (e.g., determines and outputs a value obtained by converting the α-axis voltage command value and the β-axis voltage command value into a three-phase alternating voltage command value).

- During unloading

The function when the power conversion device 3 is discharged will be explained with reference to FIG. 8 to 10 described.

In the present embodiment, the phase angle of a voltage signal of a network S at a stable system frequency as shown in Fig. 8 is, for example, 0° as indicated by a vector A0. At this time, the phase angle output from the phase calculation unit 2b is also 0°, as indicated by a vector A1. The phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g., 30°) that is shifted from the phase angle of 0° output from the phase calculation unit 2b by an angle (e.g., 30°) determined by the control calculation, such as given by a vector A3. The phase angle of the output signal of the phase adjustment unit 21 is also 30°, as indicated by a vector A4.

[0104] This is because the output signal of the phase adjustment unit 21 is not affected by the calculation of the first-order delay and thus the input signal and the output signal of the phase adjustment unit 21 have the same phase angle value. Accordingly, the phase angle of the output voltage of the power converter 1 is also 30°, as indicated by a vector A10. Therefore, the phase difference φ between the system voltage and the output voltage of the power converter 1 is 30°, and the active power proportional to sin (30°) is output (discharged) from the power converter 1.

In the present embodiment, it is assumed that the phase angle of the voltage signal of the network S is, for example, -30° as indicated by the vector A0 as the system frequency decreases, as shown in FIGURE 9.

[0106] At this time, the phase angle output from the phase calculation unit 2b is also -30°, as indicated by the vector A1. The phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g. 0°) that is shifted from the phase angle of -30° output from the phase calculation unit 2b by an angle (e.g. 30°) determined by The tax calculation specified in the vector A3 is determined. However, the phase angle of the output signal of the phase adjustment unit 21 is not the same as the vector A3, but is, for example, 15° as indicated by the vector A4. Accordingly, the phase angle of the output voltage of the power converter 1 is also 15°, as indicated by the vector A10. Therefore, the phase difference φ between the system voltage and the output voltage of the power converter 1 is 45°, and the active power proportional to sin (45°) is output (discharged) from the power converter 1.

[0107] Since the phase difference ϕ (= 45°) when the system frequency decreases is greater than the phase difference ϕ (= 30°) when the system frequency is stable, the active power output of the power converter 1 is greater when the system frequency decreases than when the system frequency is stable. That is, in a case where the phase of the system voltage changes with the decrease in the system frequency, the power converter 1 increases the output (discharged) power and suppresses the decrease in the system frequency.

In the present embodiment, it is assumed that the phase angle of the voltage signal of the grid system S is, for example, 30° as indicated by the vector A0 when the system frequency is increased, as shown in Fig. 10.

[0109] At this time, the phase angle output from the phase calculation unit 2b is also 30° as indicated by the vector A1. The phase angle of the voltage command value output from the voltage command value calculation unit 2c is an angle (e.g. 60°) advanced by an angle (e.g. 30°) from the phase angle of 30° output from the phase calculation unit 2b by an angle (e.g. 30°) determined by the Vector A3 specified tax calculation is determined. However, the phase angle of the output signal of the phase adjustment unit 21 is not the same as the vector A3, but is, for example, 45° as indicated by the vector A4. Accordingly, the phase angle of the output voltage of the power converter 1 is also 45°, as indicated by the vector A10. Therefore, the phase difference φ between the system voltage and the output voltage of the power converter 1 is 15°, and the active power proportional to sin (15°) is output (discharged) from the power converter 1.

[0110] Since the phase difference ϕ (= 15°) when the system frequency increases is smaller than the phase difference ϕ (= 30°) when the system frequency is stable, the active power output of the power converter 1 is smaller when the system frequency increases than when the system frequency is stable. That is, in a case where the phase of the system voltage changes with the increase in the system frequency, the power converter 1 reduces the output (discharged) power and suppresses the increase in the system frequency.

Next, an example of the operation of the power control device 2 according to the second embodiment will be described with reference to the flowchart of FIG. 11.

[0112] In the power control device 2, the system voltage measuring unit 2a receives the voltage signal supplied from the transducer VT and measures the AC waveform of the system voltage from the signal (step S1). For example, the system voltage measuring unit 2a determines a numerical value of a three-phase voltage waveform (sine wave) from the voltage signal supplied from the transducer VT and outputs the obtained value.

[0113] Next, the phase calculation unit 2b determines the phase of the voltage measured by the system voltage measuring unit 2a (step S2). For example, the phase calculation unit 2b performs three-phase-two-phase conversion on a three-phase voltage waveform of the voltage and obtains and outputs a phase value.

[0114] Next, the voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase of the voltage determined by the phase calculation unit 2b (step S3). The voltage command value calculation unit 2c determines a voltage command value, for example, from the phase of the voltage determined by the phase calculation unit 2b and the d-axis current deviation and q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

[0115] Next, the phase adjusting unit 21 adjusts the phase of the voltage command value determined by the voltage command value calculating unit 2c (step S4A). For example, the phase adjustment unit 21 determines a value determined by applying the first-order delay calculation to the phase adjustment (for example, the phase adjusted by using a value obtained by multiplying the difference between the angular velocity value of the output of the phase calculation unit 2b and the value of the first order deceleration of the angular velocity with a coefficient as required), adjusts the phase of the control command value (the output of the voltage command value calculation unit 2c) using the obtained value and outputs the adjusted value.

[0116] Next, the two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion on the voltage command value whose phase was adjusted by the phase adjustment unit 21 to generate an AC waveform of the control command value (step S4B). For example, the two-phase-three-phase conversion unit 2d converts the voltage command value whose phase has been adjusted by the phase adjustment unit 21 into a command value of a three-phase voltage waveform and outputs the command value (e.g., obtains and outputs a value obtained by converting the α-axis voltage command value and the β-axis voltage command value into a three-phase alternating voltage command value).

The command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d is sent to a U-phase signal generation unit 5A, a V-phase signal generation unit 5B and a W-phase signal generation unit 5C for each of the U-phases V-phase and W-phase are sent, and U-phase, V-phase and W-phase signals are generated. These signals are given to the power converter 1 to control input/output of the power converter 1.

[0118] According to the second embodiment, even if the input/output command value (active power control command value or the like) of the power conversion device 3 is constant, the phase adjusting unit 21 adjusts the phase of the voltage command value obtained from the voltage command value calculation unit 2c when the phase of the electrical quantity is as follows System voltage fluctuates due to a frequency fluctuation or the like of the AC electric circuit such as the power system S, so that the difference between the phase of the electric quantity (voltage, current, power and the like) input/outputted by the power conversion device 3 and the phase of the electric Size (voltage, current, power and the like) of the electrical circuit such as the power system S can be changed, and the input/output of the power converter 1 can be changed.

[0119] This makes it possible to realize an operation (simulation of the sluggish response) similar to the inertial behavior of the synchronous machine, and thus it is possible to suppress frequency fluctuations and oscillations of the power system, the electrical circuit and the like, which contributes to frequency stabilization of the power system, of the circuit and the like.

Third embodiment

[0120] Next, a third embodiment will be described. Below, description of parts common to the first embodiment will be omitted, and different parts will mainly be described.

[0121] FIG. 12 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the third embodiment. FIG. 12 shows a situation where a system frequency decreases in the same embodiment. In the same embodiment, the situation in which the system frequency is stable and the situation in which the system frequency increases can be easily derived from the description of each of the above-described embodiments, so the illustration and description thereof are omitted.

[0122] The third embodiment differs from the first embodiment in that a three-phase-two-phase conversion unit 31 and a phase adjustment unit 32 are arranged to be inserted into a path connecting a system voltage measurement unit 2a and a phase calculation unit 2b. Since the three-phase-two-phase conversion unit 31 and the phase adjustment unit 32 are used instead of the phase adjustment unit 11, the processing contents and operations of the phase calculation unit 2b and the phase adjustment unit 32 are different from those in the case of the first embodiment.

The three-phase-two-phase conversion unit 31 performs three-phase waveform three-phase-two-phase conversion of the voltage measured by the system voltage measuring unit 2a. For example, the three-phase-two-phase conversion unit 31 performs αβ conversion on a three-phase voltage waveform of a voltage, detects values of an α-axis voltage, a β-axis voltage and a phase, and outputs the detected values. It should be noted that this example describes an example of αβ conversion, but a method other than αβ conversion can also be used. For example, the dq conversion can be used.

The phase adjusting unit 32 adjusts the phase of the voltage obtained from the three-phase-two-phase conversion unit 31 as needed. For example, the phase adjusting unit 32 determines a value obtained by applying the calculation of the first order delay of the angular velocity to the adjustment of the phase (for example, the phase adjusted by using a value obtained by multiplying a difference between the value of the angular velocity of the phase of the output of the three-phase-two-phase converter unit 31 and the value of the first order delay of the angular velocity with a coefficient as necessary), adjusts the phases of the α-axis voltage and the β-axis voltage using this value and gives the adjusted phases.

The phase calculation unit 2b determines the phase of the voltage from the voltage whose phase was adjusted by the phase adjustment unit 32. For example, the phase calculation unit 2b determines a phase value from the α-axis voltage and the β-axis voltage whose phase has been adjusted, and outputs the phase value.

A voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase of the voltage determined by the phase calculation unit 2b. The voltage command value calculation unit 2c determines a voltage command value, for example, from the phase determined by the phase calculation unit 2b and the d-axis current deviation and q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

Next, an example of the operation of a power control device 2 according to the third embodiment will be described with reference to the flowchart of FIG. 13.

[0128] In the power control device 2, the system voltage measuring unit 2a receives a voltage signal supplied from a transducer VT and measures an AC waveform of a system voltage from the signal (step S1). For example, the system voltage measurement unit 2a determines a numerical value of a three-phase voltage waveform (sine wave) from the voltage signal supplied from the transducer VT and outputs the determined value.

[0129] Subsequently, the three-phase-two-phase conversion unit 31 determines the phase of the voltage measured by the system voltage measuring unit 2a (step S2A). For example, the three-phase-two-phase conversion unit 31 performs αβ conversion on a three-phase voltage waveform of a voltage, detects values of an α-axis voltage, a β-axis voltage and a phase, and outputs the detected values.

[0130] Next, the phase adjusting unit 32 adjusts the phase of the voltage obtained from the three-phase-two-phase conversion unit 31 (step S2B). For example, the phase adjusting unit 32 applies the calculation of the first order delay of the angular velocity to the adjustment of the phase and obtains a value at which the phase is delayed (e.g., the phase adjusted using a value obtained by multiplying a difference between the value of the angular velocity of the phase of the output of the three-phase-two-phase converter unit 31 and the value of the first order delay of the angular velocity with a coefficient as necessary), adjusts the phases of the α-axis voltage and the β-axis voltage using this value and outputs the adjusted phases.

[0131] Next, the phase calculation unit 2b determines the phase of the voltage from the voltage whose phase was adjusted by the phase adjustment unit 32 (step S2C). For example, the phase calculation unit 2b determines a phase value from the α-axis voltage and the β-axis voltage whose phase has been adjusted, and outputs the phase value.

[0132] Next, the voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase of the voltage determined by the phase calculation unit 2b (step S3). The voltage command value calculation unit 2c determines a voltage command value, for example, from the phase determined by the phase calculation unit 2b and the d-axis current deviation and the q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

[0133] Next, a two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion of the control command value obtained from the voltage command value calculation unit 2c to generate an AC waveform of the control command value (step S4). For example, the two-phase-three-phase conversion unit 2d converts the voltage command value obtained from the voltage command value calculation unit 2c into a command value of a three-phase voltage waveform and outputs the command value (for example, a value obtained by converting the α-axis voltage command value and the β -Axis voltage command value is determined and output into a three-phase alternating current command value).

The command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d is sent to a U-phase signal generation unit 5A, a V-phase signal generation unit 5B and a W-phase signal generation unit 5C for each of the U-phases V-phase and W-phase are sent, and U-phase, V-phase and W-phase signals are generated. These signals are given to the power converter 1 to control the input/output of the power converter 1.

According to the third embodiment, the three-phase-two-phase conversion unit 31 determines the phase of the voltage by three-phase-two-phase conversion from the voltage measured by the system voltage measuring unit 2a even if the input/output command value (active power control value) Command value or the like) of the power conversion device 3 is constant when the phase of the electrical quantity such as the system voltage fluctuates due to a frequency fluctuation or the like of the AC electric circuit such as the power system S, and the phase adjusting unit 32 adjusts the phase of the voltage obtained from the three-phase-two-phase conversion unit 31 sets so that the difference between the phase of the electrical quantity (voltage, current, power and the like) input/outputted from the power conversion device 3 and the phase of the electrical quantity (voltage, current, power and the like) of the electrical circuit , such as the network system S, can be changed, and the input/output of the power converter 1 can be changed.

This makes it possible to realize an operation (simulation of the sluggish response) similar to the sluggish response in the synchronous machine, so that it is possible to suppress the frequency fluctuations and oscillations of the electric circuit, which contributes to the frequency stabilization of the electric circuit .

Fourth embodiment

[0137] Next, a fourth embodiment will be described. Below, description of parts common to the first embodiment will be omitted, and different parts will mainly be described.

[0138] FIG. 14 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the fourth embodiment. FIG. 14 shows a situation where a system frequency decreases in the same embodiment. In the same embodiment, the situation in which the system frequency is stable and the situation in which the system frequency increases can be easily derived from the description of each of the above-described embodiments, so the illustration and description thereof are omitted.

The fourth embodiment is different from the first embodiment in that phase adjusting units 41 to 43, each corresponding to a U phase, a V phase and a W phase, are arranged to be inserted into paths that each connect a two-phase-three-phase conversion unit 2d and a U-phase signal generation unit 5A, a V-phase signal generation unit 5B and a W-phase signal generation unit 5C.

The phase adjusting units 41 to 43 adjust the phase of the command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d for each of the U, V and W phases as necessary. For example, the phase adjusting units 41 to 43 obtain a value obtained by applying the calculation of the first-order delay of the angular velocity to the adjustment of the phase (for example, the phase adjusted by using a value obtained by multiplying a difference between a value of the angular velocity of the output of a phase calculation unit 2b and the value of the first order delay of the angular velocity with a coefficient as required), adjust the phases of the voltage command values of the U-phase, V-phase and W-phase using this value and give the adjusted phases.

[0141] The U-phase signal generation unit 5A, the V-phase signal generation unit 5B and the W-phase signal generation unit 5C generate U-phase, V-phase and W-phase signals from the command value of the three-phase voltage waveform, their Phase has been adjusted by the phase adjusting units 41 to 43, or from the carrier waveform, and supply the generated signals to a power converter 1 to control input/output of the power converter 1.

Next, an example of the operation of a power control device 2 according to the fourth embodiment will be described with reference to the flowchart of FIG. 15.

[0143] In the power control device 2, a system voltage measuring unit 2a receives a voltage signal supplied from a transducer VT and measures an AC waveform of a system voltage from the signal (step S1). For example, the system voltage measurement unit 2a determines a numerical value of a three-phase voltage waveform (sine wave) from the voltage signal supplied from the transducer VT and outputs the determined value.

[0144] Next, the phase calculation unit 2b determines the phase and the like of the AC voltage waveform of the voltage measured by the system voltage measuring unit 2a (step S2). For example, the phase calculation unit 2b performs three-phase-two-phase conversion on a three-phase voltage waveform of the voltage, and obtains and outputs a phase value.

[0145] Next, a voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase of the voltage determined by the phase calculation unit 2b (step S3). The voltage command value calculation unit 2c obtains a voltage command value, for example, from the phase of the voltage determined by the phase calculation unit 2b and the d-axis current deviation and the q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

[0146] Next, the two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion of the control command value obtained from the voltage command value calculation unit 2c to generate an AC waveform of the control command value (step S4). For example, the two-phase-three-phase conversion unit 2d converts the voltage command value obtained from the voltage command value calculation unit 2c into a command value of a three-phase voltage waveform and outputs the command value (for example, a value obtained by converting the α-axis voltage and β -Axis voltage command values are obtained and output into a three-phase AC current command value).

[0147] Next, the phase adjusting units 41 to 43 adjust the phase of the command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d for each of the U phase, the V phase and the W phase (step S5) . For example, the phase adjusting units 41 to 43 obtain a value obtained by applying the calculation of the first order delay of the angular velocity to the adjustment of the phase (for example, the phase adjusted by using a value obtained by multiplying a difference between a value of the angular velocity of the output of the phase calculation unit 2b and the value of the first order delay of the angular velocity with a coefficient as required), set the phases of the voltage command values of the U-phase, V-phase and W-phase using this value and output the adjusted ones phases.

The command values of the three-phase voltage waveform whose phases have been adjusted by the phase adjusting units 41 to 43 are sent to the U-phase signal generating unit 5A, the V-phase signal generating unit 5B and the W-phase signal generating unit 5C for each of the U-phase Phases, V-phases and W-phases are sent, and U-phase, V-phase and W-phase signals are generated. These signals are given to the power converter 1 to control the input/output of the power converter 1.

[0149] This has the consequence that, for example, in a case in which a power conversion device 3 is discharging, as the system frequency decreases, the phase difference ϕ between the system voltage and the output voltage of the power converter 1 increases and the power converter 1 increases the power to be delivered (discharged) and the Decrease in system frequency suppressed. On the other hand, if the system frequency increases, the phase difference φ between the mains voltage and the output voltage of the power converter 1 decreases, and the power converter 1 reduces the power to be delivered (discharged) and suppresses the increase in the system frequency.

[0150] Furthermore, in a case where the power conversion device 3 is charged, as the system frequency decreases, the phase difference φ between the system voltage and the output voltage of the power converter 1 decreases, and the power converter 1 reduces the power to be input (charged) and suppresses the decrease the system frequency. On the other hand, if the system frequency increases, the phase difference ϕ between the mains voltage and the output voltage of the power converter 1 increases, and the power converter 1 increases the (charged) power to be introduced and suppresses the increase in the system frequency.

[0151] According to the fourth embodiment, the phase adjusting units 41 to 43 adjust the phase of the command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d even if the input/output command value (active power control command value or the like ) of the power conversion device 3 is constant when the phase of the electrical quantity such as the system voltage fluctuates due to a frequency fluctuation or the like of the electrical circuit such as a power system S, so that the difference between the phase of the electrical quantity (voltage, current , power, and the like) input/output from the power conversion device 3, and the phase of the electrical quantity (voltage, current, power, and the like) of the electrical circuit such as the power system S can be changed, and the input/output of the power converter 1 can be changed.

[0152] In this way, an operation (simulation of the sluggish response) can be realized that is similar to the inertia behavior in the synchronous machine, so that the frequency fluctuations and oscillations of the circuit can be suppressed, which contributes to the frequency stabilization of the electrical circuit.

Fifth embodiment

[0153] Next, a fifth embodiment will be described. Below, description of parts common to the first embodiment will be omitted, and various parts will mainly be described.

[0154] FIG. 16 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the fifth embodiment. FIG. 16 shows a situation where a system frequency decreases in the same embodiment. In the same embodiment, the situation in which the system frequency is stable and the situation in which the system frequency increases can be easily derived from the description of each embodiment described above, so the illustration and description thereof are omitted.

[0155] The fifth embodiment is different from the first embodiment in that a phase measuring unit 51, a phase adjusting unit 52 and an AC waveform generating unit 53 are arranged to be inserted into a path including a system voltage measuring unit 2a and a phase calculation unit 2b connects. Since the voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generation unit 53 are used instead of the phase adjustment unit 11, the processing content and operation of the phase adjustment unit 52 are different from those of the phase adjustment unit 11 of the first embodiment.

The voltage phase calculation unit 51 determines the phase of the AC waveform of the voltage measured by the system voltage measuring unit 2a. For example, the voltage phase calculation unit 51 performs three-phase to two-phase conversion of the three-phase voltage waveform of the voltage, and obtains and outputs a phase value. In this example, the phase is determined by three-phase to two-phase conversion. Alternatively, the phase may also be determined by a method other than three-phase-two-phase conversion. For example, the phase can be determined using a PLL (phase-locked loop) calculation.

The phase adjustment unit 52 adjusts the phase of the voltage measured by the voltage phase calculation unit 51 as needed. For example, the phase adjusting unit 52 receives and outputs a value obtained by applying the calculation of the first order delay of the angular velocity to the adjustment of the phase (for example, the phase adjusted by using a value obtained by multiplying the difference between the value of the angular velocity of the output of the phase measuring unit 51 and the value of the first order delay of the angular velocity with a coefficient).

The AC waveform generating unit 53 generates a three-phase AC waveform from the phase adjusted by the phase adjusting unit 52. For example, the AC waveform generating unit 53 obtains a three-phase AC waveform (e.g., cos (θαlag), cos (θαlag -2 · π/3), cos (θαlag -4 · π/3)) from the output (phase θαlag) of a phase adjusting unit 32 and outputs the three-phase AC waveform.

The phase calculation unit 2b determines the phase of the three-phase AC waveform generated by the AC waveform generation unit 53. For example, the phase calculation unit 2b performs three-phase-two-phase conversion of the three-phase AC waveform and obtains and outputs a phase value.

A voltage command value calculation unit 2c obtains a control command value for a power converter 1 based on the phase determined by the phase calculation unit 2b. The voltage command value calculation unit 2c determines a voltage command value, for example, from the phase determined by the phase calculation unit 2b and the d-axis current deviation and q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

[0161] Next, an example of the operation of a power control device 2 according to the fifth embodiment will be described with reference to the flowchart of FIG. 17.

[0162] In the power control device 2, the system voltage measuring unit 2a receives the voltage signal supplied from the transducer VT and measures the AC waveform of the system voltage from the signal (step S1). For example, the system voltage measuring unit 2a obtains a numerical value of a three-phase voltage waveform (sine wave) from the voltage signal supplied from the transducer VT and outputs the obtained value.

[0163] Subsequently, the voltage phase calculation unit 51 determines the phase of the voltage measured by the system voltage measuring unit 2a (step S2D). For example, the voltage phase calculation unit 51 performs three-phase to two-phase conversion of the three-phase voltage waveform of the voltage, and obtains and outputs a phase value.

[0164] Next, the phase adjustment unit 52 adjusts the phase of the voltage measured by the voltage phase calculation unit 51 (step S2E). For example, the phase adjustment unit 52 determines and outputs a value obtained by applying the calculation of the first-order delay of the angular velocity to the adjustment of the phase (for example, the phase is adjusted using a value obtained by multiplying the difference between the value the angular velocity of the output of the phase measuring unit 51 and the value of the first order delay of the angular velocity with a coefficient as required).

[0165] Next, the AC waveform generating unit 53 generates a three-phase AC waveform from the phase adjusted by the phase adjusting unit 52 (step S2F). For example, the AC waveform generation unit 53 obtains a three-phase AC waveform (e.g., cos (θαlag), cos (θαlag -2 · π/3), cos (θαlag -4 · π/3)) from the phase (phase θαlag) and outputs the three-phase AC waveform.

[0166] Next, the phase calculation unit 2b obtains a phase from the three-phase AC waveform generated by the AC waveform generation unit 53 (step S2G). For example, the phase calculation unit 2b performs three-phase-two-phase conversion on a three-phase voltage waveform of the voltage and obtains and outputs a phase value.

[0167] Next, the voltage command value calculation unit 2c determines a control command value for the power converter 1 based on the phase of the voltage determined by the phase calculation unit 2b (step S3). The voltage command value calculation unit 2c obtains a voltage command value, for example, from the phase of the voltage obtained by the phase calculation unit 2b and the d-axis current deviation and q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

[0168] Next, a two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion of the control command value obtained from the voltage command value calculation unit 2c to generate an AC waveform of the control command value (step S4). For example, the two-phase-three-phase conversion unit 2d converts the voltage command value obtained from the voltage command value calculation unit 2c into a voltage command value of a three-phase voltage waveform and outputs the command value (for example, a value obtained by converting the α-axis voltage command value and the β -Axis voltage command value is determined and output into a three-phase alternating voltage command value).

[0169] The command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d is sent to a U-phase signal generation unit 5A, a V-phase signal generation unit 5B and a W-phase signal generation unit 5C for each of the U-phases V-phase and W-phase are sent, and U-phase, V-phase and W-phase signals are generated. These signals are given to the power converter 1 to control the input/output of the power converter 1.

[0170] According to the fifth embodiment, even if the input/output command value (active power control command value or the like) of the power conversion device 3 is constant, the phase adjusting unit 52 adjusts the phase of the voltage measured by the voltage phase calculation unit 51 when the phase of the electrical quantity such as the system voltage is constant due to a Frequency fluctuation or the like of the AC electric circuit such as the power system S fluctuates, so that the difference between the phase of the electric quantity (voltage, current, power and the like) input/output from the power conversion device 3 and the phase of the electric quantity (voltage , current, power and the like) of the electrical circuit such as the power system S can be changed, and the input/output of the power converter 1 can be changed. In this way, an operation (simulation of inertia behavior) can be realized that is similar to the inertia behavior in the synchronous machine, so that the frequency fluctuations and oscillations of the circuit can be suppressed, which contributes to the frequency stabilization of the circuit.

Sixth-1, Sixth-2, Sixth-3, Sixth-4 and Sixth-5 embodiments

Next, Embodiments 6-1, 6-2, 6-3, 6-4 and 6-5 will be described. Below, description of parts common to the first to fifth embodiments will be omitted, and different parts will mainly be described.

[0172] FIG. 18A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the sixth-1 embodiment. FIG. 18B is a diagram illustrating an example of a configuration of a charger/discharger with a power conversion device according to the sixth embodiment. FIG. 18C is a diagram illustrating an example of a configuration of a charger/discharger with a power conversion device according to the sixth embodiment. FIG. 18D is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the sixth to fourth embodiments. FIG. 18E is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the sixth to fifth embodiments.

[0173] FIG. 18A, 18B, 18C, 18D and 18E show situations where the system frequency drops. The situation in which the system frequency is stable and the situation in which the system frequency increases can be easily deduced from the description of the individual embodiments described above, so that illustration and description are omitted.

[0174] As in FIG. 18A, a power control device 2 according to Embodiment 6-1 includes a function switching command unit 61 in addition to the components shown in the first embodiment (FIG. 2 and the like). As shown in FIG. 18B, a power control device 2 according to Embodiment 6-2 includes a function switching command unit 61 in addition to the components shown in the second embodiment (FIG. 9 and the like). As shown in FIG. 18C, a power control device 2 according to Embodiment 6-3 includes a function switching command unit 61 in addition to the components shown in the third embodiment (FIG. 12 and the like). As shown in FIG. 18D, a power control device 2 according to Embodiment 6-4 includes a function switching command unit 61 in addition to the components shown in the fourth embodiment (FIG. 14 and the like). As shown in FIG. 18E, a power control device 2 according to Embodiment 6-5 includes a function switching command unit 61 in addition to the components shown in the fifth embodiment (FIG. 16 and the like).

[0175] In addition, the ones shown in FIGS. 18A, 18B, 18C, 18D and 18E, phase adjustment units 11, 21, 32 and 41 to 43 have a variety of functions that enable the degree of phase adjustment to be changed (e.g. the degree of adjustment of the phase).

The function switching command unit 61 shown in Figs. 18A, 18B, 18C, 18D and 18E has a function of determining a function to be used for the phase adjustment from a plurality of functions included in the corresponding phase adjustment unit and the phase adjustment unit to give a command to switch the function (function switching command) so that the function is used for phase adjustment. The function switching command unit 61 may be configured to issue a command by manual operation or may be configured to issue a command in response to an external command.

[0177] FIG. 18F is a diagram showing an example of a functional configuration of a phase adjustment unit included in a power control device according to Embodiments 6-1, 6-2, 6-3, 6-4 and 6-5. Here, the function of the phase adjustment unit 11 of Embodiment 6-1 will be described as an example. Note that the function of adjusting the phases of the phase adjusting units 21, 32, 41 to 43 and 52 of Embodiments 6-2, 6-3, 6-4 and 6-5 is the same as that of the phase adjusting unit 11, supra that their description is omitted. Note that the phase adjusting units 21, 32, 41 to 43 and 52 do not output the phase value after adjustment, but output a value obtained by adjusting the phase of the input signal (a value of a waveform with the same amplitude as the input waveform and the adjusted phase).

[0178] As in FIG. 18F, the phase adjustment unit 11 includes a first function calculation unit F1, a second function calculation unit F2, a limit value calculation unit L1, switches SWa, SWb, SWc and SWd and a limit priority calculation unit P1.

[0179] The first function calculation unit F1 outputs a result (e.g. θ11ag) obtained by adjusting the phase of the input signal using the first function with respect to the input signal. This function includes, for example, a function for determining a value (ω) of the angular velocity of the input signal (9), a function for determining a value (ω1lag) of a first first-order delay of the angular velocity of the input signal, a function for determining a difference (ω1dif) between the value of the first first order delay of the angular velocity of the input signal and the value of the angular velocity of the input signal, a function for multiplying a coefficient and a function for multiplying time (Δt) to convert the value of the angular velocity into a phase value. In addition, the function for determining the value of the first order delay of the angular velocity contains a time constant T1, and the function for multiplying the coefficient contains a coefficient K1. The calculation performed by the first function calculation unit F1 is, for example, as follows. ω = θ/At (Δt: sample period) ω11ag = ω / (1 + T1 s) (s: Laplace operator) ω1dif = ω1lag - ω θ1lag = K2 • ω1dif · Δt

The second function calculation unit F2 outputs a result (e.g. θ2lag) obtained by adjusting the phase of the input signal using the second function with respect to the input signal. This function includes, for example, a function for determining a value (ω) of the angular velocity of the input signal (9), a function for determining a value (ω2lag) of a second first-order delay of the angular velocity of the input signal, a function for determining a difference (ω2dif) between the value of the second first order delay of the angular velocity of the input signal and the value of the angular velocity of the input signal, a function for multiplying a coefficient, and a function for multiplying time (Δt) to convert the value of the angular velocity into a phase value. In addition, the function for determining the value of the first order delay of the angular velocity contains a time constant T1, and the function for multiplying the coefficient contains a coefficient K1. The calculation performed by the first function calculation unit F1 is, for example, as follows. ω = θ/At (Δt: sample period) ω2lag = ω/(1 + T2 · s) (s: Laplace operator) ω2dif = ω2lag - ω θ2lag = K2 · ω2dif · Δt

[0181] The multiplication of the coefficient and/or Δt is not necessarily required in both the first function calculation unit F1 and the second function calculation unit F2. In a case where the value of the adjusted phase is determined using the phase change amount (e.g. Δθ) instead of the angular velocity, the multiplication by Δt is not necessary. Furthermore, in a case where a dimensionless number such as a pu value is used for various numerical values, in a case where the value of Δt is constant, in a case where the coefficient is added together with the value of Δt is multiplied, or the like, the multiplication of the coefficient and / or Δt is omitted.

[0182] The limit value calculation unit L1 calculates and outputs a result resulting from limiting the setting value of the phase of the input signal with the upper limit value and/or the lower limit value.

[0183] The limit priority calculation unit P1 receives the output signals of the first function calculation unit F1 and the second function calculation unit F2, receives the output signal of the limit value calculation unit L1 and preferably outputs a signal whose value is within the limit value (e.g. a signal with a smaller absolute value).

[0184] Next, an example of the operation of the power control device 2 according to Embodiment 6-1 will be described with reference to the flowchart of FIG. 19A. Here, description will be given of parts related to the flowchart of FIG. 1 shown in the first embodiment. 7A are omitted and different parts are described.

[0185] The above-described processing in steps S1 and S2 is also performed in the present embodiment.

[0186] In the power control device 2, the function switching command unit 61 determines a function to be used for phase adjustment from a plurality of functions included in the phase adjustment unit 11, and outputs a function switching command to the phase adjustment unit 11 so that the function for the phase adjustment is used (step S21).

[0187] Next, the phase adjusting unit 11 adjusts the phase of the voltage obtained by a phase calculation unit 2b using the designated function according to the command given by the function switching command unit 61 (step S3A-1).

[0188] Thereafter, similar processing to steps S3B and S4 described above is performed.

[0189] According to Embodiment 6-1, by issuing a function switching command from the function switching command unit 61 to the phase adjustment unit 11, it is possible to select a function to be used for the phase adjustment from a plurality of functions included in the phase adjustment unit 11 , or not to denote the function, and thus it is possible to increase or decrease an effect of the inertial reaction simulation.

[0190] Next, an example of the operation of the power control device 2 according to Embodiment 6-2 will be described with reference to the flowchart of FIG. 19B. Here, the description of parts related to the flowchart shown in the second embodiment of FIG. 11 are omitted and other parts will be described.

[0191] The above-described processing in steps S1 to S3 is also carried out in the present embodiment.

[0192] In the power control device 2, the function switching command unit 61 determines a function to be used for the phase adjustment from a plurality of functions included in the phase adjustment unit 21, and issues a function switching command to the phase adjustment unit 21 so that the function for the phase adjustment is used (step S21).

[0193] Next, the phase adjusting unit 21 adjusts the phase of the voltage command value obtained from the voltage command value calculating unit 2c using the designated function according to the command given by the function switching command unit 61 (step S4A-1).

[0194] Thereafter, similar processing to step S4B described above is performed.

[0195] According to Embodiment 6-2, by issuing a function switching command from the function switching command unit 61 to the phase adjustment unit 21, it is possible to select a function to be used for the phase adjustment from a plurality of functions included in the phase adjustment unit 21. to determine or not to determine the function, and thus it is possible to increase or decrease an effect of the inertial reaction simulation.

Next, an example of the operation of the power control device 2 according to Embodiment 6-3 will be described with reference to the flowchart in FIG. 19C. Here, description will be given of parts related to the flowchart shown in the third embodiment of FIG. 13 are omitted and different parts are described.

[0197] The above-described processing in steps S1 and S2A is also performed in the present embodiment.

[0198] In the power control device 2, the function switching command unit 61 determines a function to be used for the phase adjustment from a plurality of functions included in the phase adjustment unit 32, and issues a function switching command to the phase adjustment unit 32 so that the function for the phase adjustment is used (step S21).

[0199] Next, the phase adjusting unit 32 adjusts the phase of the voltage obtained from the three-phase-two-phase conversion unit 31 using the designated function according to the command given by the function switching command unit 61 (step S2B-1).

[0200] Thereafter, similar processing to steps S2C, S3 and S4 described above is performed.

[0201] According to Embodiment 6-3, by issuing a function switching command from the function switching command unit 61 to the phase adjustment unit 32, it is possible to select a function to be used for the phase adjustment from a plurality of functions included in the phase adjustment unit 32. to determine or not to determine the function, and thus it is possible to increase or decrease an effect of the inertial reaction simulation.

[0202] Next, an example of the operation of the power control device 2 according to Embodiment 6-4 will be described with reference to the flowchart in FIG. 19D described. Here, description will be given of parts related to the flowchart shown in the fourth embodiment of FIG. 15 are omitted and other parts will be described.

[0203] The above-described processing in steps S1 to S4 is also carried out in the present embodiment.

[0204] In the power control device 2, the function switching command unit 61 determines a function to be used for the phase adjustment from a plurality of functions included in each of the phase adjustment units 41 to 43, and issues a function switching command to each of the phase adjustment units 41 to 43, so that the phase adjustment function is used (step S21).

[0205] Next, each of the phase adjusting units 41 to 43 adjusts the phase of the command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d using the designated function according to the command given by the function switching command unit 61 (step S5- 1).

[0206] According to Embodiment 6-4, it is possible to designate a function to be used for the phase adjustment from a plurality of functions provided in each of the phase adjustment units 41 to 43 by issuing a function switching command from the function switching command unit 61 to each of the phase adjustment units 41 to 43 43 are included or not to designate the function, and thus it is possible to increase or decrease an effect of the inertial reaction simulation.

[0207] Next, an example of the operation of the power control device 2 according to Embodiment 6-5 will be described with reference to the flowchart in FIG. 19E described. Here, description will be given of parts related to the flowchart shown in the fifth embodiment of FIG. 17 are omitted and different parts are described.

[0208] The above-described processing in steps S1 and S2D is also performed in the present embodiment.

[0209] In the power control device 2, the function switching command unit 61 designates a function to be used for phase adjustment from a plurality of functions included in the phase adjustment unit 52, and issues a function switching command to the phase adjustment unit 52 so that the function for the phase adjustment is used (step S21).

[0210] Next, the phase adjusting unit 52 adjusts the phase of the voltage measured by the voltage phase calculating unit 51 using the designated function according to the command given by the function switching command unit 61 (step S2E-1).

[0211] Thereafter, similar processing to steps S2F, S2G, S3 and S4 described above is performed.

[0212] According to Embodiment 6-5, it is possible to designate a function to be used for the phase adjustment from among a plurality of functions included in the phase adjustment unit 52 by issuing a function switching command from the function switching command unit 61 to the phase adjustment unit 52 Function cannot be denoted, and thus it is possible to increase or decrease an effect of the inertial reaction simulation.

Seventh-1, Seventh-2, Seventh-3, Seventh-4 and Seventh-5 embodiments

Next, Embodiments 7-1, 7-2, 7-3, 7-4 and 7-5 will be described. Below, description of parts common to the first to fifth embodiments will be omitted, and various parts thereof will mainly be described.

[0214] FIG. 20A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-1. FIG. 20B is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-2. FIG. 20C is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-3. FIG. 20D is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-4. FIG. 20E is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 7-5.

[0215] FIG. 20A, 20B, 20C, 20D and 20E show situations where the system frequency drops. The situation in which the system frequency is stable and the situation in which the system frequency increases can be easily deduced from the description of the individual embodiments described above, so their illustration and description are omitted.

[0216] As in FIG. 20A, a power control device 2 according to Embodiment 7-1 includes a coefficient change command unit 71 in addition to the components shown in the first embodiment (FIG. 2 and the like). As shown in FIG. 20B, a power control device 2 according to Embodiment 7-2 includes a coefficient change command unit 71 in addition to the components shown in the second embodiment (FIG. 9 and the like). As shown in FIG. 20C, a power control device 2 according to Embodiment 7-3 includes a coefficient change command unit 71 in addition to the components shown in the third embodiment (FIG. 12 and the like). As shown in FIG. 20D, a power control device 2 according to Embodiment 7-4 includes, in addition to the components shown in the fourth embodiment (FIG. 14 and the like), a coefficient change command unit 71. As shown in FIG. 20E, a power control device 2 according to Embodiment 7-5 includes a coefficient change command unit 71 in addition to the components shown in the fifth embodiment (FIG. 16 and the like).

[0217] In addition, the ones shown in FIGS. 20A, 20B, 20C, 20D and 20E, phase adjustment units 11, 21, 32, 41 to 43 and 52 shown have functions that make it possible to change the degree of phase adjustment (e.g. the degree of adjustment of the phase) according to the value of the coefficient.

The coefficient change command unit 71 shown in each of Figs. 20A, 20B, 20C, 20D and 20E has a function of giving a command to change the time constant and/or the coefficient (coefficient change command) to the phase adjusting unit, so that a Value of the time constant and / or the coefficient to be applied is used in the function used for the phase adjustment in the corresponding phase adjustment unit. The coefficient change command unit 71 may specify the value of the time constant and/or the coefficient instead of giving the command to change the time constant and/or the coefficient. Additionally, it may be configured to issue a command through manual operation or may be configured to issue a command in response to an external command.

[0219] FIG. 20F is a diagram showing an example of a functional configuration of a phase adjustment unit included in a power control device according to Embodiments 7-1, 7-2, 7-3, 7-4 and 7-5. Here, the function of the phase adjustment unit 11 of Embodiment 7-1 will be described as an example. Note that the functions of the phase adjustment units 21, 32, 41 to 43 and 52 of Embodiments 7-2, 7-3, 7-4 and 7-5 are to determine the phase after adjustment (adjustment of the phase under Using a value obtained by multiplying the first-order delay of the angular velocity and the difference of the angular velocity by a coefficient as necessary), are the same as those of the phase adjusting unit 11, and therefore their description is omitted. Note that the phase adjusting units 21, 32, 41 to 43 and 52 do not output the phase value after adjustment, but output a value obtained by adjusting the phase of the input signal (a value of a waveform having the same amplitude as the input waveform and the adjusted phase).

[0220] As in FIG. 20F, the phase adjustment unit 11 includes a function calculation unit F20, a limit value calculation unit L1, and a limit priority calculation unit P1.

[0221] The function calculation unit F20 outputs a result obtained by adjusting the phase of the input signal using a function with respect to the input signal. This function includes, for example, a function for determining the value (ω) of the angular velocity of the input signal (9), a function for determining the value (ωlag) of the first-order delay of the angular velocity of the input signal, a function for determining the difference (ωdif) between the first order delay value of the angular velocity of the input signal and the value of the angular velocity of the input signal, a function for multiplying a coefficient, and a function for multiplying time (Δt) to convert the value of the angular velocity into a phase value. In addition, the function for determining the value of the first-order delay of the angular velocity includes a time constant T, and the function for multiplying the coefficient includes a coefficient K. The value of the first-order delay time constant T and/or the coefficient K of the coefficient multiplication unit can be changed become. The calculation performed by the function calculation unit F20 is, for example, as follows. ω = θ/At (Δt: sample period) ωlag = ω/(1 + T s) (s: Laplace operator) ωdif = ωlag - ω θlag = K · ωdif · Δt

[0222] The limit value calculation unit L1 calculates and outputs a result resulting from limiting the setting value of the phase of the input signal with the upper limit value and/or the lower limit value.

[0223] The limit priority calculation unit P1 receives the output signal of the function calculation unit F20, receives the output signal of the limit value calculation unit L1, and preferably outputs a signal whose value is within the limit range (for example, a signal with a smaller absolute value).

[0224] The time constant T of the first-order delay calculation and/or the value of the coefficient K of the coefficient calculation unit included in the function of the function calculation unit F20 are changed by a value or a coefficient change command given from the coefficient change command unit 71.

[0225] Next, an example of the operation of the power control device 2 according to the seventh embodiment will be described with reference to the flowchart of FIG. 21A. Here, description will be given of parts related to the flowchart of FIG. 1 shown in the first embodiment. 7A are omitted and other parts will be described.

[0226] The above-described processing in steps S1 and S2 is also performed in the present embodiment.

[0227] In the power control device 2, the coefficient change command unit 71 determines a value of a coefficient to be applied to a function used for phase adjustment, and issues a coefficient change command to the phase adjustment unit 11 so that the value of the coefficient is applied to the function ( Step S31).

[0228] Next, the phase adjustment unit 11 adjusts the phase of the voltage obtained by a phase calculation unit 2b using the function to which the set time constant and/or the coefficient is applied according to the command given by the coefficient change command unit 71 ( Step S3A-2).

[0229] Thereafter, similar processing to steps S3B and S4 described above is performed.

[0230] According to Embodiment 7-1, it is possible to change the value of the coefficient to be applied to the function included in the phase adjusting unit 11 by giving the coefficient change command from the coefficient change command unit 71 to the phase adjusting unit 11, and thus is It is possible to increase or decrease an effect of the inertial reaction simulation.

[0231] Next, an example of the operation of the power control device 2 according to Embodiment 7-2 will be described with reference to the flowchart of FIG. 21B. Here, the description of parts related to the flowchart shown in the second embodiment of FIG. 11 are omitted and other parts will be described.

[0232] The above-described processing in steps S1 to S3 is also performed in the present embodiment.

[0233] In the power control device 2, the coefficient change command unit 71 determines a value of a coefficient to be applied to a function used for phase adjustment, and issues a coefficient change command to the phase adjustment unit 11 so that the value of the coefficient is applied to the function ( Step S31).

[0234] Next, the phase adjusting unit 21 adjusts the phase of the voltage command value obtained from a voltage command value calculating unit 2c using the function to which the designated time constant and/or the designated coefficient is applied according to the command given by the coefficient changing command unit 71 ( Step S4A-2).

[0235] Thereafter, similar processing to step S4B described above is performed.

[0236] According to Embodiment 7-2, it is possible to change the value of the coefficient to be applied to the function included in the phase adjusting unit 21 by giving the coefficient change command from the coefficient change command unit 71 to the phase adjusting unit 21, and thus is It is possible to increase or decrease an effect of the inertial reaction simulation.

[0237] Next, an example of the operation of the power control device 2 according to Embodiment 7-3 will be described with reference to the flowchart of FIG. 21C. Here, description will be given of parts related to the flowchart shown in the third embodiment of FIG. 13 are omitted and other parts will be described.

[0238] The above-described processing in steps S1 and S2A is also performed in the present embodiment.

[0239] In the power control device 2, the coefficient change command unit 71 determines a value of a coefficient to be applied to a function used for phase adjustment, and issues a coefficient change command to the phase adjustment unit 32 so that the value of the coefficient is applied to the function ( Step S31).

[0240] Next, the phase adjusting unit 32 adjusts the phase of the voltage obtained from the three-phase-two-phase conversion unit 31 by using the function to which the designated time constant and/or the designated coefficient according to that given by the coefficient changing command unit 71 command is applied (step S2B-1).

[0241] Thereafter, similar processing to steps S2C, S3 and S4 described above is performed.

[0242] According to Embodiment 7-3, it is possible to change the value of the coefficient to be applied to the function included in the phase adjusting unit 32 by giving the coefficient change command from the coefficient change command unit 71 to the phase adjusting unit 32, and thus, it is possible to increase or decrease an effect of the inertial reaction simulation.

[0243] Next, an example of the operation of the power control device 2 according to Embodiment 7-4 will be described with reference to the flowchart of FIG. 21D. Here, description will be given of parts related to the flowchart shown in the fourth embodiment of FIG. 15 are omitted and other parts will be described.

[0244] The above-described processing in steps S1 to S4 is also carried out in the present embodiment.

[0245] In the power control device 2, the coefficient change command unit 71 determines a value of a coefficient to be applied to a function used for phase adjustment, and issues a coefficient change command to each of the phase adjustment units 41 to 43 to apply the value of the coefficient to the function (step S31).

[0246] Next, each of the phase adjusting units 41 to 43 adjusts the phase of the command value of the three-phase voltage waveform generated by a two-phase-three-phase conversion unit 2d using the function to which the specified time constant and/or the specified coefficient according to the command given by the coefficient change command unit 71 is applied (step S5-2).

[0247] According to Embodiment 7-4, it is possible to give the coefficient change command from the coefficient change command unit 71 to each of the phase adjusting units 41 to 43 to change the value of the coefficient applied to the function performed in each of the phase adjusting units 41 to 43 is included, and thus it is possible to increase or decrease an effect of the inertial reaction simulation.

[0248] Next, an example of the operation of the power control device 2 according to Embodiment 7-5 will be described with reference to the flowchart of FIG. 21E. Here, description will be given of parts related to the flowchart shown in the fifth embodiment in FIG. 17 are omitted and different parts are described.

[0249] The above-described processing in steps S1 and S2D is also performed in the present embodiment.

[0250] In the power control device 2, the coefficient change command unit 71 determines a value of a coefficient to be applied to a function used for phase adjustment, and issues a coefficient change command to the phase adjustment unit 52 so that the value of the coefficient is applied to the function ( Step S31).

[0251] Next, the phase adjustment unit 52 adjusts the phase of the voltage measured by the voltage phase calculation unit 51 using the function to which the designated time constant and/or the designated coefficient is applied according to the command given by the coefficient change command unit 71 (step S2E -2).

[0252] Thereafter, similar processing to steps S2F, S2G, S3 and S4 described above is performed.

[0253] According to Embodiment 7-5, it is possible to give the coefficient change command from the coefficient change command unit 71 to the phase adjusting unit 52 to change the value of the coefficient to be applied to the function included in the phase adjusting unit 52, and thus it is possible to increase or decrease an effect of the inertial reaction simulation.

Eighth embodiment

[0254] Next, an eighth embodiment will be described. Below, description of parts common to the first to fifth embodiments will be omitted, and various parts will mainly be described.

[0255] FIG. 22A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the eighth embodiment. Note that in FIG. 22A, the same reference numbers are assigned to the same elements as in the FIGS. 1 to 3, 8 to 11, 12, 14 and 16 described in the first to fifth embodiments. Note that the signals from a phase calculation unit 2b to the phase adjustment units 21 and 41 to 43 are not shown.

[0256] A power control device 2 according to the eighth embodiment includes components of at least one of the embodiments of the phase adjustment unit 11 described in the first embodiment (FIG. 1 and the like), the phase adjustment unit 21 described in the second embodiment (FIG. 8 and the like), the in the third embodiment (FIG. 12 and the like), the phase adjustment units 41 to 43 described in the fourth embodiment (FIG. 14 and the like), the voltage-phase calculation unit 51 described in the fifth embodiment (FIG. 16 and the like), the phase adjustment unit 52 and the AC waveform generating unit 53. For convenience, configuration examples of the above-described five embodiments are shown here in the same drawing, but in order to obtain the effect of simulating the inertial behavior, a configuration including only components of one embodiment may be used contains.

[0257] The phase adjustment unit 11 in FIG. 22A is further provided with the switching units SW1a and SW1b. These switching units enable switching between a first path through which the output signal of the phase calculation unit 2b passes through the phase adjustment unit 11, and a second path (bypass BP1) through which the output signal of the phase calculation unit 2b is bypassed without passing through the phase adjustment unit 11.

[0258] When the switching unit SW1a is in a closed state and the switching unit SW1b is in an open state, a circuit is formed that causes the phase adjustment unit 11 to process the output signal of the phase calculation unit 2b via the first path and then output the processed signal to provide a voltage command value calculation unit 2c. Further, when the switching unit SW1b is in a closed state and the switching unit SW1a is in an open state, a circuit is formed that supplies the output signal of the phase calculation unit 2b to the voltage command value calculation unit 2c via the second path (bypass BP1) without the phase adjustment unit 11 to go through.

[0259] The phase adjustment unit 21 in FIG. 22A is further provided with the switching units SW2a and SW2b. These switching units enable switching between a first path, via which the output signal of the voltage command value calculation unit 2c passes through the phase adjustment unit 21, and a second path (bypass BP2), via which the output signal of the voltage command value calculation unit 2c is bypassed, without the phase adjustment unit 21 run through.

[0260] When the switching unit SW2a is in a closed state and the switching unit SW2b is in an open state, a circuit is formed that causes the phase adjustment unit 21 to process the output signal of the voltage command value calculation unit 2c via the first path and then the processed To supply signal to a two-phase-three-phase conversion unit 2d. Furthermore, when the switching unit SW2b is in a closed state and the switching unit SW2a is in an open state, a circuit is formed that supplies the output signal of the voltage command value calculation unit 2c to the two-phase-three-phase conversion unit 2d via the second path (bypass BP2). without going through the phase adjustment unit 21.

[0261] The phase adjustment unit 32 in FIG. 22A is further provided with the switching units SW3a and SW3b. These switching units enable switching between a first path through which the output signal of the three-phase-two-phase converter unit 31 passes through the phase adjustment unit 32 and a second path (bypass BP3) through which the output signal of the three-phase-two-phase converter unit 31 is bypassed without to go through the phase adjustment unit 32.

[0262] When the switching unit SW3a is in a closed state and the switching unit SW3b is in an open state, a circuit is formed that causes the phase adjusting unit 32 to process the output signal of the three-phase-two-phase converter unit 31 via the first path and then to deliver the processed signal to the phase calculation unit 2b. In addition, when the switching unit SW3b is in a closed state and the switching unit SW3a is in an open state, a circuit is formed that supplies the output signal of the three-phase-two-phase converter unit 31 to the phase calculation unit 2b via the second path (bypass BP3) without to go through the phase adjustment unit 32.

[0263] The phase adjustment units 41 to 43 in FIG. 22A are also provided with the switching units SW4ua and SW4ub, SW4va and SW4vb or SW4wa and SW4wb. These switching units enable switching between a first path, via which the output signal of the two-phase-three-phase conversion unit 2d passes through the phase adjustment units 41 to 43, and a second path (bypass BP4u, BP4v, BP4w), via which the output signal of the two-phase-three-phase Conversion unit 2d is bypassed without passing through the phase adjustment units 41 to 43.

[0264] When the switching units SW4ua, SW4va and SW4wa are in a closed state and the switching units SW4ub, SW4vb and SW4wb are in an open state, a circuit is formed that causes the phase adjusting units 41 to 43 to output the output signal of the two-phase-three-phase Converting unit 2d via the first path and then supplying the processed output signal to a U-phase signal generating unit 5A, a V-phase signal generating unit 5B and a W-phase signal generating unit 5C. Furthermore, when the switching units SW4ub, SW4vb and SW4wb are in a closed state and the switching units SW4ua, SW4va and SW4wa are in an open state, a circuit is formed which outputs the output signal of the two-phase-three-phase conversion unit 2d via the second path (bypass BP4u , BP4v, BP4w) to the U-phase signal generation unit 5A, the V-phase signal generation unit 5B and the W-phase signal generation unit 5C without passing through the phase adjustment units 41 to 43.

[0265] The voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generation unit 53 in Fig. 22A are further provided with the switching units SW5a and SW5b. These switching units enable switching between a first path through which the output of the system voltage measurement unit 2a passes through the voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generation unit 53, and a second path (bypass BP5) through which the output of the system voltage measurement unit 2a is bypassed , without passing through the voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generation unit 53.

[0266] When the switching unit SW5a is in a closed state and the switching unit SW5b is in an open state, a circuit is formed that causes the voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generating unit 53 to output the output signal of the system voltage measuring unit 2a via the to process the first path and then deliver the processed signal to the three-phase-two-phase converter unit 31. In addition, when the switching unit SW5b is in a closed state and the switching unit SW5a is in an open state, a circuit is formed that supplies the output signal of the system voltage measuring unit 2a to the three-phase-two-phase converter unit 31 via the second path (bypass BP5) without the voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generation unit 53.

[0267] The power control device 2 according to the eighth embodiment further includes a shift switching command unit 81. Each of the above-described switching units unlocks a specific path among the first and second paths in response to a path switching command issued from the shift switching command unit 81.

22B is a diagram showing an example of a functional configuration of each phase adjustment unit included in the power control device 2 according to the eighth embodiment. Here the function of the phase adjustment unit 11 is described as an example. Note that the function of obtaining the phases after adjustment of the phase adjusting units 21, 32, 41 to 43 and 52 is the same as that of the phase adjusting unit 11, and therefore the description thereof is omitted. Note that the phase adjusting units 21, 32, 41 to 43 and 52 do not output the phase value after adjustment, but output a value obtained by adjusting the phase of the input signal (a value of a waveform with the same amplitude as the input waveform and the adjusted phase).

[0269] As in FIG. 22B, the phase adjustment unit 11 includes a function calculation unit F22, a limit value calculation unit L1 and a limit priority calculation unit P1.

[0270] The function calculation unit F22 outputs a result (e.g. θlag) obtained by adjusting the phase of the input signal using a function with respect to the input signal. This function includes, for example, a function for determining the value (ω) of the angular velocity of the input signal (9), a function for determining the value (ωlag) of the first-order delay of the angular velocity of the input signal, a function for determining the difference (ωdif) between the value of the first order delay of the angular velocity of the input signal and the value of the angular velocity of the input signal, a function for multiplying a coefficient and a function for multiplying time (Δt) to convert the value of the angular velocity into a phase value. In addition, the function for obtaining the value of the first-order deceleration of the angular velocity includes a time constant T, and the function for multiplying the coefficient includes a coefficient K. The calculation performed by the function calculation unit F22 is, for example, as follows. ω = θ/At (Δt: sample period) ωlag = ω/ (1 + T s) (s: Laplace operator) ωdif = ωlag - ω θlag = K · ωdif · Δt

[0271] The limit value calculation unit L1 calculates and outputs a result resulting from limiting the setting value of the phase of the input signal with the upper limit value and/or the lower limit value.

[0272] The limit priority calculation unit P1 receives the output signal of the function calculation unit F22, receives the output signal of the limit value calculation unit L1, and preferably outputs a signal whose value is within the limit range (for example, a signal with a smaller absolute value).

[0273] For the calculation of the phase adjustment, a calculation (function) other than the calculation of the first-order delay can be used. For example, a PLL calculation or a second-order delay calculation can be used. The limit value calculation unit L1 and the limit priority calculation unit P1 may be provided outside the phase adjustment unit 11, or a plurality of limit value calculation units may be provided, and the limit value may be switched by a switch or the like.

[0274] Next, an example (part 1) of the operation of the power control device 2 according to the eighth embodiment will be described with reference to the flowchart of FIG. 23A. Here, description will be given of parts related to the flowchart of FIG. 1 shown in the first embodiment. 7A are omitted, and various parts are described.

[0275] The above-described processing in steps S1 and S2 is also performed in the present embodiment.

[0276] In the power control device 2, the shift switching command unit 81 determines a path to be activated between the first path and the second path (bypass BP1) passing through the phase adjusting unit 11, and issues a shift switching command to the switching units SW1a and SW1b so that only the Path is activated. As a result, in the switching units SW1a and SW1b, the opening/closing state is switched so that the designated path is activated in accordance with the command given from the switching command unit 81. In a case where the first path is activated (NO in step S41), the phase adjusting unit 11 adjusts the phase of the voltage obtained from the phase calculation unit 2b (step S3A-3). If the second path (bypass BP1) is activated (YES in step S41), the phase is not adjusted.

[0277] Next, the voltage command value calculation unit 2c determines a control command value for a power converter 1 based on the phase adjusted by the phase adjusting unit 11 or the bypassed phase (step S3B-3). The voltage command value calculation unit 2c obtains a voltage command value, for example, from the phase set or bypassed by the phase adjustment unit 11 and the d-axis current deviation and the q-axis current deviation calculated by the calculation units 3c and 3f, and outputs the voltage command value.

[0278] Thereafter, processing similar to that in step S4 described above is performed.

[0279] Next, an example (part 2) of the operation of the power control device 2 according to the eighth embodiment will be explained with reference to the flowchart in FIG. 23B described. Here, the description of parts related to the flowchart shown in the second embodiment of FIG. 11 are omitted, and various parts are described.

[0280] The above-described processing in steps S1 to S3 is also carried out in the present embodiment.

[0281] In the power control device 2, the shift switching command unit 81 determines a path to be activated between the first path and the second path (bypass BP2) passing through the phase adjusting unit 21, and issues a shift switching command to the switching units SW2a and SW2b so that only the Path is activated. As a result, in the switching units SW2a and SW2b, the opening/closing state is switched so that the designated path is activated in accordance with the command given by the switching switching command unit 81. In a case where the first path is activated (NO in step S41), the phase adjusting unit 21 adjusts the phase of the voltage command value obtained from the voltage command value calculating unit 2c (step S4A-3). In a case where the second path (bypass BP2) is activated (YES in step S41), the phase is not adjusted.

[0282] Thereafter, the two-phase-three-phase conversion unit 2d performs two-phase-three-phase conversion on the voltage command value whose phase was adjusted by the phase adjusting unit 21 or on the bypassed voltage command value to generate an AC waveform of the control command value (step S4B-3 ). For example, the two-phase-three-phase conversion unit 2d converts the voltage command value whose phase has been adjusted by the phase adjustment unit 21 into a command value of a three-phase voltage waveform, and outputs the command value (e.g., obtains and outputs a value obtained by converting the α-axis voltage command value and the β-axis voltage command value into a three-phase alternating voltage command value).

[0283] Next, an example (Part 3) of the operation of the power control device 2 according to the eighth embodiment will be explained with reference to the flowchart in FIG. 23C described. Here, description will be given of parts related to the flowchart shown in the third embodiment of FIG. 13 are omitted and various parts are described.

[0284] The above-described processing in steps S1 and S2A is also performed in the present embodiment.

[0285] In the power control device 2, the shift switching command unit 81 determines a path to be activated between the first path and the second path (bypass BP3) passing through the phase adjusting unit 32, and issues a shift switching command to the switching units SW3a and SW3b so that only the Path is activated. As a result, in the switching units SW3a and SW3b, the opening/closing state is switched so that the designated path is activated in accordance with the command given from the switching command unit 81. In a case where the first path is activated (NO in step S41), the phase adjusting unit 32 adjusts the phase of the voltage obtained from the three-phase-two-phase converter unit 31 (step S2B-3). If the second path (bypass BP3) is activated (YES in step S41), the phase is not adjusted.

[0286] Next, the phase calculation unit 2b determines the phase of the voltage from the voltage whose phase was adjusted by the phase adjusting unit 32, the bypassed voltage (step S2C-3). For example, the phase calculation unit 2b obtains a phase value from the α-axis voltage and the β-axis voltage whose phase has been adjusted, and outputs the phase value.

[0287] Thereafter, similar processing to steps S3 and S4 described above is performed.

[0288] Next, an example (part 4) of the operation of the power control device 2 according to the eighth embodiment will be explained with reference to the flowchart in FIG. 23D described. Here, description will be given of parts related to the flowchart shown in the fourth embodiment of FIG. 15 are omitted and other parts will be described.

[0289] The above-described processing in steps S1 to S4 is also carried out in the present embodiment.

[0290] In the power control device 2, the shift switching command unit 81 determines a path to be activated between the first path and the second path (bypass BP4u, BP4v, BP4w) passing through the phase adjustment units 41 to 43, and issues a shift switching command to the switching units SW4ua, SW4va, SW4wa, SW4ub, SW4vb and SW4wb so that only the path is activated. As a result, in the switching units SW4ua, SW4va, SW4wa, SW4ub, SW4vb and SW4wb, the opening/closing state is switched so that the designated path is activated according to the command given from the switching command unit 81. In a case where the first path is activated (NO in step S41), the phase adjusting units 41 to 43 obtain a value obtained by adjusting the phase of the command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d is (step S5B-3). In a case where the second path (bypass BP4u, BP4v, BP4w) is activated, the phase is not adjusted (YES in step S41).

[0291] Next, an example (Part 5) of the operation of the power control device 2 according to the eighth embodiment will be explained with reference to the flowchart in FIG. 23E described. Here, description will be given of parts related to the flowchart shown in the fifth embodiment of FIG. 17 are omitted and other parts will be described.

[0292] The above-described processing in step S1 is also performed in the present embodiment.

[0293] In the power control device 2, the switching switching command unit 81 determines a path to be activated between the first path and the second path (bypass BP5) passing through the voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generating unit 53, and issues a switching switching command to the switching units SW5a and SW5b so that only the path is activated. As a result, in the switching units SW5a and SW5b, the opening/closing state is switched so that the designated path is released according to the command given from the switching switching command unit 81. In a case where the first path is enabled (NO in step S41), the voltage phase calculation unit 51 obtains the phase of the voltage from the voltage measured by the system voltage measuring unit 2a (step S2D-3), the phase adjusting unit 52 adjusts the phase of the voltage measured by the system voltage measuring unit 2a Voltage phase calculation unit 51 inputs the measured voltage (step S2E), and the AC waveform generating unit 53 generates a three-phase AC waveform of the voltage whose phase has been adjusted by the phase adjusting unit 52 (step S2F). In a case where the second path (bypass BP5) is enabled, the processing of the voltage phase calculation unit 51, the phase adjustment unit 52 and the AC waveform generation unit 53 is not performed (YES in step S41).

[0294] Next, the phase calculation unit 2b obtains the phase from the three-phase AC waveform (three-phase AC waveform whose phase has been adjusted) generated by the AC waveform generation unit 53 or the bypassed three-phase AC waveform (step S2G-3). For example, the phase calculation unit 2b performs three-phase-two-phase conversion on a three-phase voltage waveform of the voltage, and obtains and outputs a phase value.

[0295] Thereafter, similar processing to steps S3 and S4 described above is performed.

[0296] According to the eighth embodiment, by issuing a switching command from the switching command unit 81 to any switching unit, it is possible to switch the path so that only one of the first path and the second path is activated, and thus it is possible to switch between to switch between activating and deactivating the simulation of the inertial reaction.

[0297] Note that in a case where a function related to path switching is realized by software, circuits constituting the switching units SW1 and SW2, the first path, the second path and the like, can be omitted.

Ninth-1, Ninth-2 and Ninth-3 embodiments

[0298] Next, Embodiments 9-1, 9-2 and 9-3 will be described. The following is the description of parts corresponding to Embodiment 6-1, Embodiment 6-2, 6-3, Embodiment 6-4 and 6-5, Embodiment 7-1, Embodiment 7-2, Embodiment 7-3, etc 7-4 and 7-5 and the eighth embodiment are omitted, and various parts thereof are mainly described.

24A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the ninth embodiment-1. FIG. 24B is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 9-2. FIG. 24C is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 9-3.

[0300] As shown in Fig. 24A, a power conversion device 3 according to Embodiment 9-1 includes an electric quantity change processing unit 10 and a power control device 2. The power control device 2 corresponds to the power control device 2 used in Embodiments 6-1, 6-2, 6-3, 6-4 and 6-5 (FIGS. 18A, 18B, 18C, 18D, 18E, and the like). However, in the present embodiment, instead of the function switching command unit 61 in the power control device 2, a function switching command unit 96-1 having the same function as the function switching command unit 61 outside the power control device 2 is provided.

[0301] The electric quantity change processing unit 10 includes a reference value setting unit 90, a current measuring unit 91, a system voltage measuring unit 92, a phase calculation unit 93, an electric quantity change calculation unit 94, a comparison unit 95, and the function switching command unit 96-1.

[0302] The reference value setting unit 90 has a function of setting a reference value for a change amount or a change rate of an electrical quantity (voltage, current, power, phase, etc.) and outputting the set reference value. Here, for example, the reference value is at least one of three types of reference values, including a reference value used for comparison with a value of a change amount or a change rate of a current measured by the current measuring unit 91, a reference value used for comparison with a A value of a change amount or a change rate of a voltage measured by the system voltage measuring unit 92 and a reference value used for comparison with a value of a change amount or a change rate of a phase obtained from the phase calculation unit 93. Here, an example of a case in which a function for setting all three kinds of reference values and a function for outputting the set reference value are provided will be described, but the present invention is not limited to this example. The reference value can consist of two types or only one type. Here, an example will be described in which the current measurement unit 91, the system voltage measurement unit 92, and the phase calculation unit 93 are included, but the phase calculation unit 93 may not be included, and any type of the current measurement unit 91 and the system voltage measurement unit 92 may be included.

[0303] The current measuring unit 91 receives a current signal supplied from a power converter CT1, and uses the signal to measure the AC waveform of the current flowing through the circuit on the output side of the power converter 1 (current).

[0304] The system voltage measurement unit 92 receives a voltage signal supplied from a transducer VT and measures an AC waveform of the system voltage from the signal. For example, the system voltage measurement unit 92 obtains a numerical value of a three-phase voltage waveform (sine wave) from the voltage signal supplied from the transducer VT and outputs the obtained value.

[0305] The phase calculation unit 93 determines the phase of the AC voltage waveform of the voltage measured by the system voltage measuring unit 92. For example, the phase calculation unit 93 performs three-phase-two-phase conversion on a three-phase voltage waveform of the voltage, and obtains and outputs a phase value.

[0306] The electric quantity change calculation unit 94 determines a change amount or a change rate of an electrical quantity (current, voltage, phase, etc.) determined by the current measurement unit 91, the system voltage measurement unit 92, or the phase calculation unit 93. Here, amount of change means an amount of change in the broadest sense, including a rate of change and the like.

[0307] The current value measured by the current measuring unit 91, the voltage value measured by the system voltage measuring unit 92, or the phase value determined by the phase calculation unit 93 is input to the electric quantity change calculation unit 94.

[0308] The comparison unit 95 outputs information indicating whether the change amount or the change rate of the electrical quantity determined by the electrical quantity change calculation unit 94 is equal to or greater than or greater than a predetermined reference value determined by the reference value setting unit 90 has been set (or is equal to, or smaller, or smaller than the predetermined reference value) or not.

[0309] The function switching command unit 96-1 determines a function to be used for the phase adjustment from a plurality of functions included in a corresponding phase adjustment unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 according to the information output from the comparison unit 95, and gives a command for switching the function (switch open/close) (function switching command) to the corresponding phase adjustment unit in the power control device 2 so that the function for phase adjustment is used.

[0310] As in FIG. 24B, a power conversion device 3 according to Embodiment 9-2 includes an electric quantity change processing unit 10 and a power control device 2. The power control device 2 corresponds to the power control device 2 used in Embodiments 7-1, 7-2, 7-3, 7-4 and 7-5 (FIGS. 20A, 20B, 20C, 20D, 20E and the like). However, in the present embodiment, instead of the coefficient change command unit 71 in the power control device 2, a coefficient change command unit 96-2 having the same function as the coefficient change command unit 71 outside the power control device 2 is provided.

[0311] The electric quantity change processing unit 10 includes a reference value setting unit 90, a current measurement unit 91, a system voltage measurement unit 92, a phase calculation unit 93, an electric quantity change calculation unit 94, a comparison unit 95, and the coefficient change command unit 96-2.

[0312] The functions of the reference value setting unit 90, the current measuring unit 91, the system voltage measuring unit 92, the phase calculation unit 93, the electric quantity change calculation unit 94 and the comparison unit 95 are as described above.

[0313] According to the information output from the comparison unit 95, the coefficient change command unit 96-2 issues a command to change the time constant and/or the coefficient (coefficient change command) to the corresponding phase adjustment unit in the power control device 2, so that the value of the time constant and/or the coefficient to be applied to the function used for the phase adjustment in the corresponding phase adjustment unit (one of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 is applied to the function. Instead of giving the command to change the time constant and/or the coefficient, the value of the time constant and/or the coefficient can also be specified.

[0314] As in FIG. 24C, a power conversion device 3 according to Embodiment 9-3 includes an electric quantity change processing unit 10 and a power control device 2. The power control device 2 corresponds to the power control device 2 described in the eighth embodiment (Fig. 22A and the like). However, in the present embodiment, instead of providing the circuit switching command unit 81 in the power control device 2, a circuit switching command unit 96-3 having the same function as the circuit switching command unit 81 is provided outside the power control device 2.

[0315] The electric quantity change processing unit 10 includes a reference value setting unit 90, a current measuring unit 91, a system voltage measuring unit 92, a phase calculation unit 93, an electric quantity change calculation unit 94, a comparison unit 95, and the circuit switching command unit 96-3.

[0316] The functions of the reference value setting unit 90, the current measuring unit 91, the system voltage measuring unit 92, the phase calculation unit 93, the electric quantity change calculation unit 94 and the comparison unit 95 are as described above.

[0317] According to the information output from the comparison unit 95, the shift switching command unit 96-3 determines a path to be enabled between a first path and a second path (any of a bypass BP1, a bypass BP2, a bypass BP3, the bypasses BP4u, BP4v and BP4w and a bypass BP5) which is connected by the corresponding phase adjustment unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the one shown in FIG. 22A, and the corresponding switching unit (any of the switching units SW1a and SW1b, the switching units SW2a and SW2b, the switching units SW3a and SW3b, the switching units SW4ua, SW4va, SW4wa, SW4ub, SW4vb and SW4wb and the switching units SW5a and SW5b ) in the power control device 2 gives a command to switch the open/close state (switch switching command) so that only the path is released.

[0318] Next, an example of the operation of the power conversion device 3 according to the ninth embodiment will be described with reference to a flowchart in FIG. 25A.

[0319] In the present embodiment, the reference value setting unit 90 sets a reference value for a change amount or a change rate of an electrical quantity (voltage, current, power, phase, etc.) (step S50).

[0320] Furthermore, the current measuring unit 91 measures an AC waveform of a current flowing through a circuit on an output side of the power converter 1 (current) from a current signal supplied from a power converter CT1, the system voltage measuring unit 92 measures an AC waveform of a system voltage from one of one Transducer VT supplied voltage signal, the phase calculation unit 93 obtains the phase of the AC waveform of the voltage measured by the system voltage measuring unit 92, and the electrical quantity change calculation unit 94 obtains the amount of change or the rate of change in the electrical quantity obtained from the current measuring unit 91, the system voltage measuring unit 92 or the phase calculation unit 93 is obtained (step S51).

[0321] Next, the comparison unit 95 receives the value of the change amount or the change rate of the electrical quantity (current, voltage, phase, etc.) obtained from the electric quantity change calculation unit 94, receives a reference value corresponding to the change amount or the change rate of the electrical quantity from the reference value setting unit 90, makes a comparison between both, and outputs information indicating whether or not the amount of change or the rate of change of the electrical quantity satisfies a condition for performing the inertial behavior simulation (step S52).

[0322] Next, the function switch command unit 96-1 determines whether or not the information output from the comparison unit 95 satisfies a predetermined condition (step S53), and in a case where the condition is satisfied, the function switch command unit 96-1 gives one Function switching command (switch opening/closing command) to the corresponding phase adjustment unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 (step S21-1).

[0323] For example, in a case where the information output from the comparison unit 95 does not indicate that the condition for performing the inertia behavior simulation is satisfied, the function switch command unit 96-1 issues a function switch command (switch open/close command) to the corresponding phase adjustment unit in the power control device 2, so that the calculation processing by the function is bypassed, so that the simulation of the sluggish response is not performed. On the other hand, in a case where the information output from the comparison unit 95 indicates that the condition for performing the inertia simulation is satisfied, the function switching command unit 96-1 issues a function switching command (switch open/close command) to the corresponding phase adjustment unit in the power control device 2, so that a predetermined function is used for the phase adjustment, so that the simulation of the inertia behavior is carried out.

[0324] Next, an example of the operation of the power conversion device 3 according to Embodiment 9-2 will be described using the flowchart in FIG. 25B.

[0325] The processing described above in steps S50 to S52 is also performed in the present embodiment.

[0326] Next, the coefficient change command unit 96-2 determines whether or not the information output from the comparison unit 95 satisfies a predetermined condition (step S53), and in a case where the condition is satisfied, the coefficient change command unit outputs 96-2 sends a command to change the time constant and/or the coefficient to the corresponding phase adjustment unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 (step S31-1).

[0327] For example, in a case where the information output from the comparison unit 95 does not indicate that the condition for performing the slow reaction simulation is satisfied, the coefficient change command unit 96-2 issues a command to change the time constant and/or or the coefficient to the corresponding phase adjustment unit in the power control device 2, so that the time constant and/or the coefficient with a value of 0 is applied to the function, so that the simulation of the inertia behavior is not carried out. On the other hand, in a case where the information output from the comparison unit 95 indicates that the condition for performing the inertia reaction simulation is satisfied, the coefficient change command unit 96-2 issues a command to change the time constant and/or the coefficient to the corresponding phase adjustment unit in the power control device 2, so that the time constant and/or the coefficient with a predetermined value is applied to the function so that the inertia response simulation is performed.

[0328] Next, an example of the operation of the power conversion device 3 according to Embodiment 9-3 will be described with reference to a flowchart in FIG. 25C.

[0329] The above-described processing in steps S50 to S52 is also performed in the present embodiment.

[0330] Next, the shift shift command unit 96-3 determines whether or not the information output from the comparison unit 95 satisfies a predetermined condition (step S53), and in a case where the condition is satisfied, the shift shift command unit 96-3 gives one Command for switching the open/close state (circuit switching command) to the corresponding circuit unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2, so that only the first path including the corresponding phase adjustment unit (any of the switching units SW1a and SW1b, the switching units SW2a and SW2b, the switching units SW3a and SW3b, the switching units SW4ua, SW4va, SW4wa, SW4ub, SW4vb and SW4wb and the switching units SW5a and SW5b) in the power control device 2 is released (step S41-1).

[0331] For example, in a case where the information output from the comparison unit 95 does not indicate that the condition for performing the inertia behavior simulation is satisfied, the shift switching command unit 96-3 issues a switching command to the corresponding switching unit in the power control device 2, so that the second path is activated and the first path is deactivated, so that the simulation of the inertial behavior is not carried out. On the other hand, in a case where the information output from the comparison unit 95 indicates that the condition for performing the inertia reaction simulation is satisfied, the shift switching command unit 96-3 issues a shift switching command to the corresponding circuit unit in the power control device 2 so that the first path is activated and the second path is deactivated so that the inertial response simulation is performed.

[0332] According to Embodiments 9-1, 9-2 and 9-3, the activation and deactivation of the simulation of the inertia behavior is switched according to the information from the comparison unit 95, so that stable control that does not fall into an outlier or an uncontrollable state due to excessive control can be realized. Embodiments 10-1, 10-2 and 10-3

[0333] Next, Embodiments 10-1, 10-2 and 10-3 will be described. The following is the description of parts corresponding to Embodiments 6-1, 6-2, 6-3, 6-4 and 6-5, Embodiments 7-1, 7-2, 7-3, 7-4 and 7- 5 and the eighth embodiment are omitted, and various parts are mainly described.

[0334] In Embodiments 9-1, 9-2 and 9-3, an example was described in which the electrical quantity, the amount of change or the rate of change of the electrical quantity, or the reference value used to determine whether the condition for execution the simulation of the inertia behavior is satisfied or not is used is one type, but in Embodiments 10-1, 10-2 and 10-3, an example is described in which the electrical quantity, the amount of change or the rate of change of the electrical quantity or the reference value used to determine whether the condition for performing the inertial reaction simulation is satisfied or not is a variety of types.

26A is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 10-1. FIG. 26B is a diagram illustrating an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 10-2. FIG. 26C is a diagram showing an example of a configuration of a charger/discharger with a power conversion device according to Embodiment 10-3.

[0336] As in FIG. 26A, a power conversion device 3 according to Embodiment 10-1 includes an electric quantity change processing unit 10 and a power control device 2. The power control device 2 corresponds to the power control device 2 used in Embodiments 6-1, 6-2, 6-3, 6-4 and 6-5 (FIGS. 18A, 18B, 18C, 18D, 18E and the like). However, in the present embodiment, instead of the function switching command unit 61 in the power control device 2, a function switching command unit 103-1 having the same function as the function switching command unit 61 outside the power control device 2 is provided.

[0337] The electric quantity change processing unit 10 includes a current measuring unit 91, a system voltage measuring unit 92, a phase calculation unit 93, a reference value setting unit 100, an electric quantity change calculation unit 101, a comparison/determination unit 102, and the function switching command unit 103-1.

[0338] The functions of the current measuring unit 91, the system voltage measuring unit 92 and the phase calculation unit 93 are as described above.

[0339] The reference value setting unit 100 has a function (limit value setting function) for setting a limit value (upper limit value and/or lower limit value).

[0340] The reference value setting unit 100 has a function of setting an electrical quantity (voltage, current, power, phase, etc.) or a reference value of a change amount or a change rate of the electrical quantity (e.g., an upper limit and/or a lower limit), and a Function for outputting the set reference value. The reference value referred to here is, for example, at least one of six types of reference values, including a reference value used for comparison with the value of the current measured by the current measuring unit 91, a reference value used for comparison with the value of the a reference value used for comparison with the phase value obtained by the phase calculation unit 93, a reference value used for comparison with the value of the amount of change or the rate of change of the current of the current measurement unit 91 obtained by the system voltage measuring unit 92 Electric quantity change calculation unit 101 is calculated, a reference value used for comparison with the value of the change amount or rate of change of the voltage of the system voltage measuring unit 92 calculated by the electric quantity change calculation unit 101, and a reference value used for comparison with the value of The amount of change or the rate of change of the phase of the phase calculation unit 93 is used, which is calculated by the electric quantity change calculation unit 101. Here, an example of a case in which a function for setting all six kinds of reference values and a function for outputting the set reference value are provided will be described, but the present invention is not limited to this example. The reference value can consist of two to five types or only one type.

[0341] The electrical quantity change calculation unit 101 obtains a change amount or a change rate of an electrical quantity (current, voltage, phase, etc.) determined by the current measurement unit 91, the system voltage measurement unit 92, or the phase calculation unit 93.

[0342] At least one of three kinds of values, including the current value measured by the current measuring unit 91, the voltage value measured by the system voltage measuring unit 92, and the phase value determined by the phase calculation unit 93, is input to the electric quantity change calculation unit 101. Here, an example of a case where all three kinds of values are input to the electric quantity change calculation unit 101 will be described, but the present invention is not limited to this example. Also, only two kinds of values or only one kind of values may be input into the electric quantity change calculation unit 101.

[0343] The comparison/determination unit 102 has a function of performing comparison processing (comparison function) and a function of performing determination processing (determination function).

[0344] The comparison function of the comparison/determination unit 102 has the function of determining a value of an electrical quantity (current, voltage, phase, etc.) determined by the current measuring unit 91, the system voltage measuring unit 92 or the phase calculation unit 93, and/or a value of a change amount or a rate of change of the electrical quantity, receive a reference value corresponding to the electrical quantity and/or the amount or rate of change of the electrical quantity from the reference value setting unit 100, and output information indicating whether the electrical quantity (current , voltage, phase, etc.) and/or the value of the amount of change or the rate of change of the electrical quantity deviates from a predetermined reference value or not.

[0345] The comparison function of the comparison/determination unit 102 includes, for example, a function for receiving a value of an electrical quantity (current, voltage, phase, etc.) determined by the current measuring unit 91, the system voltage measuring unit 92 or the phase calculation unit 93, and/or or a value of a change amount or a change rate of the electrical quantity, receiving a reference value corresponding to the electrical quantity and/or the change amount or the change rate of the electrical quantity from the reference value setting unit 100, making a comparison between them, and outputting information that indicate whether the electrical quantity and/or the value of the amount of change or the rate of change of the electrical quantity deviates from the reference value or not.

[0346] The determining function of the comparing/determining unit 102 has the function of determining whether to switch the function based on the output of the comparing function of the comparing/determining unit 102 (information indicating whether or not the reference value does not deviate). should or not.

[0347] The function switching command unit 103-1 designates a function to be used for the phase adjustment from a plurality of functions included in a corresponding phase adjustment unit (any one of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 according to the information output from the comparison unit/determination unit 102, and gives a command for switching the function (switch open/close) (function switching command) to the corresponding phase adjustment unit in the power control device 2 so that the function for phase adjustment is used.

[0348] As in FIG. 26B, a power conversion device 3 according to Embodiment 10-2 includes an electric quantity change processing unit 10 and a power control device 2. The power control device 2 corresponds to the power control device 2 used in Embodiments 7-1, 7-2, 7-3, 7-4 and 7-5 (FIGS. 20A, 20B, 20C, 20D, 20E and the like). However, in the present embodiment, instead of the coefficient change command unit 71 in the power control device 2, a coefficient change command unit 103-2 having the same function as the coefficient change command unit 71 outside the power control device 2 is provided.

[0349] The electric quantity change processing unit 10 includes a current measurement unit 91, a system voltage measurement unit 92, a phase calculation unit 93, a reference value setting unit 100, an electric quantity change calculation unit 101, a comparison/determination unit 102, and the coefficient change command unit 103-2.

[0350] The functions of the current measurement unit 91, the system voltage measurement unit 92, the phase calculation unit 93, the reference value setting unit 100, the electric quantity change calculation unit 101 and the comparison/determination unit 102 are as described above.

[0351] According to the information output from the comparison unit/determination unit 102, the coefficient change command unit 103-2 issues a command for changing the time constant and/or the coefficient (coefficient change command) to the corresponding phase adjusting unit in the power control device 2 so that the value the time constant and/or the coefficient to be applied to the function used for the phase adjustment in the corresponding phase adjustment unit (one of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 is applied. The coefficient change command unit 103-2 may specify the value of the time constant and/or the coefficient instead of giving the command to change the time constant and/or the coefficient.

[0352] In a case where the information output from the comparison unit/determination unit 102 does not indicate that the condition for performing the slow response simulation is satisfied (for example, in a case where the value is “0”) , the coefficient change command unit 103-2 issues a coefficient change command to the corresponding phase adjustment unit in the power control device 2 so that the time constant and/or the coefficient with the value 0 is applied to the function, so that the simulation of the slow response is not performed becomes. On the other hand, in a case where the information output from the comparison unit/determination unit 102 indicates that the condition for performing the inertia behavior simulation is satisfied (for example, in a case where the value “1 “), a command for changing the time constant and/or the coefficient to the corresponding phase adjustment unit in the power control device 2 so that the time constant and/or the coefficient is applied to the function with a predetermined value, so that the simulation of the slow response is carried out.

[0353] As in FIG. 26C, a power conversion device 3 according to Embodiment 10-3 includes an electric quantity change processing unit 10 and a power control device 2. The power control device 2 corresponds to the power control device 2 used in Embodiments 6-1, 6-2, 6-3, 6-4 and 6-5 (FIGS. 18A, 18B, 18C, 18D, 18E, and the like). However, in the present embodiment, instead of the shift switching command unit 81 in the power control device 2, a shift switching command unit 103-3 having the same function as the shift switching command unit 81 outside the power control device 2 is provided.

[0354] The electric quantity change processing unit 10 includes a current measurement unit 91, a system voltage measurement unit 92, a phase calculation unit 93, a reference value setting unit 100, an electric quantity change calculation unit 101, a comparison/determination unit 102, and the circuit switching command unit 103-3.

[0355] The functions of the current measurement unit 91, the system voltage measurement unit 92, the phase calculation unit 93, the reference value setting unit 100, the electric quantity change calculation unit 101 and the comparison/determination unit 102 are as described above.

[0356] According to the information output from the comparison unit/determination unit 102, the shift switching command unit 103-3 determines a path to be enabled between a first path and a second path (any of a bypass BP1, a bypass BP2, a bypass BP3, bypasses BP4u, BP4v, and BP4w and a bypass BP5) which is connected by the corresponding phase adjustment unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the one shown in FIG. 22A, and the corresponding switching unit (any of the switching units SW1a and SW1b, the switching units SW2a and SW2b, the switching units SW3a and SW3b, the switching units SW4ua, SW4va, SW4wa, SW4ub, SW4vb and SW4wb and the switching units SW5a and SW5b ) in the power control device 2 gives a command to switch the open/close state (switch switching command) so that only the path is enabled.

[0357] In a case where the information output from the comparison unit/determination unit 102 does not indicate that the condition for performing the inertia behavior simulation is satisfied (e.g., in a case where the value is “0”), there is the shift switching command unit 103-3 sends a shift switching command to the corresponding phase adjustment unit in the power control device 2 so that the second path is activated and the first path is deactivated, so that the simulation of the inertia behavior is not performed. On the other hand, in a case where the information output from the comparison unit/determination unit 102 indicates that the condition for performing the inertia behavior simulation is satisfied (for example, in a case where the value “1”), the shift switching command unit 103-3 is), a circuit switching command to the corresponding phase adjustment unit in the power control device 2, so that the first path is activated and the second path is deactivated, so that the simulation of the inertial behavior is carried out.

26D is a diagram showing an example of a functional configuration of the comparison/determination unit 102 included in the power conversion device 3 according to Embodiments 10-1, 10-2 and 10-3.

[0359] In the example of FIG. 26D it is assumed that the function of the reference value setting unit 100 described above is integrated into the comparison/determination unit 102. The function of the limit value/reference value setting unit 100 is realized by a first reference value setting unit 102c and a second reference value setting unit 102f in the comparison/determination unit 102.

[0360] Die Vergleichs-/Bestimmungseinheit 102 beinhaltet eine Spannungsmesseinheit 102a, eine Änderungsbetragsberechnungseinheit 102b, eine erste Referenzwerteinstellungseinheit 102c, eine Spannungsänderungsbetragsvergleichseinheit 102d, eine Strommesseinheit 102e, eine zweite Referenzwerteinstellungseinheit 102f, eine Stromvergleichseinheit 102g und eine Bestimmungsberechnungseinheit 102h.

[0361] For example, the comparison/determination unit 102 receives a signal of the system voltage measured by the system voltage measuring unit 92 and receives a signal of the circuit current measured by the current measuring unit 91.

[0362] The voltage measurement unit 102a measures the voltage from the system voltage signal input to the comparison/determination unit 102. The change amount calculation unit 102b measures a change amount of the voltage measured by the voltage measurement unit 102a. The first reference value setting unit 102c sets a reference value for the voltage change amount. The voltage change amount comparison unit 102d compares the change amount measured by the change amount calculation unit 102b with the reference value and outputs a value of "1", for example, when the change amount is equal to or exceeds the reference value, and otherwise outputs a value of "0", for example out of.

[0363] On the other hand, the current measurement unit 102e measures the value of the circuit input to the comparison/determination unit 102. The second reference value setting unit 102f sets a reference value for the current. The current comparison unit 102g compares the current value measured by the current measuring unit 102e with the reference value and, for example, outputs a value of “1” when the current value is equal to or smaller than the reference value, that is, in a state in which the current value does not deviate from the reference value, and otherwise outputs a value of “0”, for example.

[0364] The determination calculation unit 102h receives the value output from the voltage change amount comparison unit 102d and receives the value output from the current comparison unit 102g. The determination calculation unit 102h outputs a value of “1” (i.e., information indicating that it is in a state suitable for performing the inertia reaction simulation) when the value “1” and output from the voltage change amount comparison unit 102d the value output from the current comparison unit 102g is “1”, and otherwise outputs a value of “0” (i.e., information indicating that it is not in a state suitable for performing the inertia reaction simulation).

[0365] Note that in this example, a case has been exemplified where the two kinds of electrical quantities received from the comparison/determination unit 102 are “voltage” and “current,” respectively. However, each of the two types of electrical quantities can be changed into different electrical quantities (power, phase, etc.). The two types of electrical quantities may be different from each other or may be the same type of electrical quantity.

[0366] Next, an example of the operation of the power conversion device 3 according to the tenth embodiment will be explained with reference to the flowchart in FIG. 27A described.

[0367] In the present embodiment, the command value setting unit 100 sets a command value of an electrical quantity (voltage, current, power, phase, etc.) and/or a change amount or a change speed of the electrical quantity (step S60).

[0368] Furthermore, the current measuring unit 91 measures an AC waveform of a current flowing through a circuit on an output side of the power converter 1 (current) from a current signal supplied from a power converter CT1, the system voltage measuring unit 92 measures an AC waveform of a system voltage from one of one Transducer VT supplied voltage signal, the phase calculation unit 93 obtains the phase of the AC waveform of the voltage measured by the system voltage measuring unit 92, and the electrical quantity change calculation unit 101 obtains the amount of change or the rate of change in the electrical quantity obtained from the current measuring unit 91, the system voltage measuring unit 92 or the phase calculation unit 93 is obtained (step S61).

[0369] Next, the comparison/determination unit 102 receives a value of the electrical quantity (current, voltage, phase, etc.) determined by the current measurement unit 91, the system voltage measurement unit 92, or the phase calculation unit 93 and/or a value of a change amount or a rate of change of the electrical quantity (current, voltage, phase, etc.), which is determined by the electrical quantity change calculation unit 101, receives the electrical quantity or a reference value corresponding to the change amount or the rate of change of the electrical quantity from the reference value setting unit 100, makes a comparison between both and outputs information indicating whether or not the amount of change or the rate of change of the electrical quantity deviates from the reference value (step S62).

[0370] Next, the comparison/determination unit 102 performs processing to determine whether the condition for performing the inertia reaction simulation is satisfied (step S62).

[0371] The comparison function of the comparison/determination unit 102 includes, for example, a function for receiving a value of an electrical quantity (current, voltage, phase, etc.) determined by the current measuring unit 91, the system voltage measuring unit 92 or the phase calculation unit 93, and/or or a value of a change amount or a change rate of the electrical quantity (current, voltage, phase, etc.) determined by the electric quantity change calculation unit 101, receiving a reference value corresponding to the electrical quantity and/or the change amount or the change rate of the electrical quantity corresponds to outputting from the reference value setting unit 100, comparing the two, and outputting information indicating whether the value of the electrical quantity deviates from the reference value or not.

[0372] On the other hand, the determining function of the comparison/determination unit 102 has the function of determining, based on the output of the comparison function of the comparison/determination unit 102 (information indicating whether or not the reference value does not deviate), whether the function is switched should be or not.

[0373] Next, the function switching command unit 103-1 issues a function switching command to the corresponding phase adjustment unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 according to the information output from the comparison/determination unit 102 (step S21-2).

[0374] In a case where the information output from the comparison/determination unit 102 does not indicate that the condition for performing the inertia behavior simulation is satisfied (e.g., in a case where the value is “0”), the function switching command unit 103-1 issues a function switching command (switch opening/closing command) to the corresponding phase adjustment unit in the power control device 2, so that the calculation processing by the function is bypassed, so that the simulation of the sluggish response is not performed. On the other hand, in a case where the information output from the comparison/determination unit 102 indicates that the condition for performing the inertia behavior simulation is satisfied (e.g., in a case where the value “1”), the function switching command unit 103-1 is), a function switching command (switch open/close command) to the corresponding phase adjustment unit in the power control device 2 so that a predetermined function is used for the phase adjustment so that the simulation of the inertia behavior is carried out.

[0375] Next, an example of the operation of the power conversion device 3 according to the tenth embodiment will be described with reference to a flowchart in FIG. 27B.

[0376] The above-described processing in steps S60, S61 and S62 is also performed in the present embodiment.

[0377] Next, the coefficient change command unit 103-2 gives a command to change the time constant and/or the coefficient to the corresponding phase adjustment unit (any of the phase adjustment units 11, 21, 32, 41 to 43 and 52) in the power control device 2 according to the information output from the comparison/determination unit 102 (step S31-2).

[0378] Next, an example of the operation of the power conversion device 3 according to Embodiment 10-3 will be described with reference to a flowchart in FIG. 27C.

[0379] The above-described processing in steps S60, S61 and S62 is also performed in the present embodiment.

[0380] Next, the shift shift command unit 103-3 determines whether or not the information output from the comparison/determination unit 102 satisfies a predetermined condition (step S63), and in a case where the condition is satisfied, the shift shift command unit 103 outputs -3 sends a command for switching the open/close state (circuit switching command) to the corresponding circuit unit (any of the phase adjusting units 11, 21, 32, 41 to 43 and 52) in the power control device 2, so that only the first path including the corresponding phase adjusting unit ( any of the switching units SW1a and SW1b, the switching units SW2a and SW2b, the switching units SW3a and SW3b, the switching units SW4ua, SW4va, SW4wa, SW4ub, SW4vb and SW4wb, and the switching units SW5a and SW5b) in the power control device 2 is released (step S41-1 ).

[0381] According to Embodiments 10-1, 10-2 and 10-3, the activation and deactivation of the inertia reaction simulation is switched or the effect of the inertia reaction simulation is increased or decreased according to the information from the comparison/determination unit 102, so that an appropriate Control can be performed and stable control that does not fall into an outlier or an uncontrollable state due to excessive control can be realized.

Eleventh embodiment

[0382] Next, an eleventh embodiment will be described. Below, description of parts common to the first embodiment will be omitted, and various parts will mainly be described.

[0383] FIG. 28 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the eleventh embodiment. Note that in FIG. 28 the same reference numerals correspond to the same elements as in FIG. 2 are assigned. Here, an example of a case where a power conversion device 3 discharges will be described. In addition, FIG. 28 shows a situation in which a system frequency decreases in the same embodiment. In the same embodiment, the situation in which the system frequency is stable and the situation in which the system frequency increases can be easily derived from the description of each of the above-described embodiments, so the illustration and description thereof are omitted.

[0384] In the first embodiment described above, an example has been described in which even when the input/output command value (active power control command value or the like) of the power conversion device 3 is constant, the phase of the electric quantity, such as For example, the system voltage fluctuates due to a frequency fluctuation or the like of the AC electrical circuit such as the power system S, the phase supplied to the voltage command value calculation unit 2c is changed to make up the difference between the phase of the electrical quantity (voltage, current, power and etc.) input/output from the power conversion device 3 and the phase of the electrical quantity (voltage, current, power and the like) of the electrical circuit such as the power system S.

[0385] On the other hand, in the eleventh embodiment, an example will be described in which the input/output (voltage, current, power, etc.) of the power conversion device 3 is changed by not changing the phase supplied to the voltage command value calculation unit 2c but changing that of The inertia simulation control signal supplied to the inertia simulation control signal generating unit 15 is added to the active power control command value supplied from the active power control command value calculation unit 202 to the power control device 2 described above.

[0386] As in FIG. 28, the power control device 2 according to the eleventh embodiment includes, in addition to the components shown in the first embodiment (FIG. 2 and the like), the inertia simulation control signal generating unit 15 and the like.

[0387] As described above, the phase adjustment unit 11 adjusts the phase of the voltage obtained from the phase calculation unit 2b as needed. For example, the phase adjustment unit 11 determines and outputs a value obtained by applying the calculation of the first order delay of the angular velocity to the adjustment of the phase (for example, a phase value (θlag) obtained by setting a difference (ωdif) between a value (ω) an angular velocity of the output (9) of the phase calculation unit 2b and a value (ωlag) of a first-order delay of the angular velocity is obtained by multiplying a coefficient (K) and the time (Δt). For example, the calculation performed by the phase adjustment unit 11 is the same as the calculation performed by the phase adjustment unit 11 of the first embodiment.

[0388] The inertia simulation control signal generation unit 15 receives and generates a signal (inertia simulation control signal θdif) indicating a difference between the phase (9) obtained from the phase calculation unit 2b and the phase (θlag) after adjustment by the phase adjustment unit 11 a value obtained by converting the value by applying a function (e.g. sinθ), multiplying the value by a coefficient, or converting the value to a pu value as necessary. The inertia simulation control signal generating unit 15, for example, performs the following calculation to generate an inertia simulation control signal (Pvic). θdif = θlag-θ Pvic = sin (θdif) (Example of converting θdif to an inertial simulation control signal using a function) Pvic = K - θdif (Example of multiplying θdif by a coefficient and converting it to an inertial simulation control signal) Pvic = K - θdif/(2 - n)

(Example of converting θdif to a pu value and further multiplying the pu value by a coefficient to obtain an inertia simulation control signal)

[0389] Pvic = K - sin(θdif)

(Example of using a function for θdif and further multiplying θdif by a coefficient to obtain an inertia simulation control signal)

[0390] The inertia simulation control signal generated by the inertia simulation control signal generation unit 15 is added to the active power control command value supplied to the power control device 2 from the active power control command value calculation unit 202. For example, the inertia simulation control signal generated by the inertia simulation control signal generating unit 15 is supplied to a calculation unit 3a as shown in FIG. 28.

[0391] As described above, the active power control command value calculation unit 202 receives, for example, the automatic frequency control command value (AFC command value) and/or the controller-free signal transmitted from the higher-level control system and outputs the active power control command value. The active power control command value output from the active power control command value calculation unit 202 is transmitted to the calculation unit 3a in the power control device 2.

[0392] The calculation unit 3a receives the active power control command value output from the active power control command value calculation unit 202, receives the active power measurement value output from the active power and reactive power calculation unit 201, and outputs a difference (active power deviation) between the two . At this time, the calculation unit 3a adds the inertia simulation control signal output from the inertia simulation control signal generating unit 15. The output of the calculation unit 3a is sent to a d-axis current command value calculation unit 3b.

[0393] The d-axis current command value calculation unit 3b receives the output of the calculation unit 3a, and obtains and outputs a d-axis current command value based on the output of the calculation unit 3a. The current command value for the d-axis is sent to the calculation unit 3c. The calculation unit 3c receives the d-axis current command value, receives the measured value of the d-axis current output from the power converter current dq conversion unit 2g, and outputs the deviation of the d-axis current as the difference between the two values. The d-axis current deviation is sent to the voltage command value calculation unit 2c.

[0394] The voltage command value calculation unit 2c obtains a voltage command value from the phase of the voltage, the d-axis current deviation, and the q-axis current deviation obtained from the phase calculation unit 2b, and outputs the voltage command value.

[0395] The two-phase-three-phase conversion unit 2d converts the voltage command value into a command value of a three-phase voltage waveform and outputs the command value (determines and outputs, for example, a value obtained by converting the α-axis voltage command value and the β-axis voltage command value into a three-phase alternating voltage command value).

- During unloading

[0396] The function when the power conversion device 3 is discharged will be explained with reference to FIG. 28 described.

[0397] In the present embodiment, it is assumed that when the system frequency decreases, the phase angle of the input signal of the phase adjustment unit 11 (the output signal of the phase calculation unit 2b) is, for example, -30° as indicated by a vector A1, and the phase angle of the output signal of the Phase adjustment unit 11 (the input signal of the inertia simulation control signal generating unit 15) is, for example, -15°, as indicated by a vector A2. At this time, the difference between the output signal (-15°) of the phase adjustment unit 11 and the input signal (-30°) is 15°, and the value of the inertia simulation control signal output from the inertia simulation control signal generating unit 15 is, for example, sin ( 15°) (in a case where the inertia simulation control signal is obtained using sinθ as a conversion function).

[0398] If the calculation unit 3a does not receive the inertia simulation control signal output from the inertia simulation control signal generation unit 15 (or receives an inertia simulation control signal having a value of 0), the voltage command value output from the voltage command value calculation unit 2c is a Value calculated by a difference (active power deviation) between the output of the active power control command value calculation unit 202 and the output of the active power and reactive power calculation unit 201.

[0399] On the other hand, as in this example, when the calculation unit 3a receives the inertia simulation control signal whose value output from the inertia simulation control signal generating unit 15 is sin (15°), the output of the calculation unit 3a increases by an amount that is obtained by adding the value of the inertia simulation control signal (sin (15°)).

[0400] Accordingly, the active power output (discharged) from the power converter 1 increases by the inertia simulation control signal.

[0401] In the present embodiment, as the system frequency increases, the system voltage, the output of the phase calculation unit 2b, the output of the phase adjustment unit 11, the output of the inertia simulation control signal generating unit 15, the output of the voltage command value calculation unit 2c, and the output of the Power converter 1 in the opposite direction to the case where the system frequency drops. For example, assume that the phase angle of the input signal of the phase adjustment unit 11 (the output signal of the phase calculation unit 2b) is 30°, and the phase angle of the output signal of the phase adjustment unit 11 (the input signal of the inertia simulation control signal generating unit 15) is 15°. At this time, the difference between the output signal (15°) of the phase adjustment unit 11 and the input signal (30°) is -15°, and the value of the inertia simulation control signal output from the inertia simulation control signal generating unit 15 is, for example, sin (- 15°), which is a minus value. That is, in the present embodiment, when the system frequency increases, the output of the calculation unit 3a is smaller by the value of the inertia simulation control signal than when the system frequency is stable due to the above-described functions of the phase adjustment unit 11 and the inertia simulation control signal generating unit 15. Accordingly, the active power output (discharged) from the power converter 1 is smaller than that when the system frequency is stable by the value of the inertia simulation control signal.

- While charging

[0402] In a case where the power conversion device 3 is charged, the relationship between the increase or decrease of the inertia simulation control signal and the increase or decrease of the absolute value of the active power of the power conversion device 3 is opposite to that in discharging. For example, assuming that the active power in the discharging direction is plus and the active power in the charging direction is minus, in a case where the value of the signal difference before and after the plus phase speed adjustment is added, the absolute value of the active power in the discharging direction increases, and the absolute value of the active power in the charging direction decreases. Conversely, in a case where the value of the minus inertia simulation control signal is added, the absolute value of the active power in the discharging direction decreases and the absolute value of the command value in the charging direction increases.

[0403] That is, in the present embodiment, when the system frequency decreases, the absolute value of the output of the calculation unit 3a is smaller than the absolute value of the output of the calculation unit 3a by the value of the inertia simulation control signal when the system frequency decreases due to the above-described functions of the phase adjustment unit 11 and the Inertial simulation control signal generating unit 15 is stable, and the power input (charged) to power converter 1 is smaller than that when the system frequency is stable. That is, in a case where the phase of the system voltage changes with the decrease in the system frequency, the power converter 1 reduces the input (charged) power and suppresses the decrease in the system frequency.

[0404] Furthermore, in the present embodiment, when the system frequency increases, the absolute value of the output of the calculation unit 3a is larger by the value of the inertia simulation control signal than the absolute value of the output of the calculation unit 3a when the system frequency increases due to the above-described functions of the phase adjustment unit 11 and the inertia simulation control signal generating unit 15 is stable, and the power supplied (charged) to the power converter 1 is larger when the system frequency increases than when the system frequency is stable. That is, in a case where the phase of the system voltage changes with the rise of the system frequency, the power converter 1 increases the power to be input (charged) and suppresses the rise of the system frequency.

[0405] Next, an example of the operation of the power control device 2 according to the eleventh embodiment will be described with reference to the flowchart of FIG. 29. Here, description of parts consistent with the flowchart of Fig. 7A shown in the first embodiment is omitted, and different parts are described.

[0406] The above-described processing in steps S1 and S2 is also performed in the present embodiment.

[0407] Next, the phase adjustment unit 11 adjusts the phase of the voltage obtained from the phase calculation unit 2b (step S71). For example, the phase adjusting unit 11 obtains and outputs a value obtained by applying the calculation of the first-order delay of the angular velocity to the adjustment of the phase (for example, a phase value obtained by adjusting the difference between the value of the angular velocity output from the phase calculating unit 2b Angular velocity and the value of the first order delay of the angular velocity is obtained by multiplying a coefficient and time).

[0408] Next, the inertia simulation control signal generation unit 15 generates a signal (inertia simulation control signal) representing a difference between the phase (9) obtained from the phase calculation unit 2b, the phase (θlag) after adjustment by the phase adjustment unit 11, and the Phase (9) indicates before the adjustment (step S72).

[0409] The inertia simulation control signal generated by the inertia simulation control signal generation unit 15 in this way is added to the active power control command value supplied from the active power control command value calculation unit 202 to the power control device 2 (step S73).

[0410] For example, the inertia simulation control signal generated by the inertia simulation control signal generation unit 15 is supplied to a calculation unit 3a. The calculation unit 3a receives the active power control command value output from the active power control command value calculation unit 202, receives the active power measurement value output from the active power and reactive power calculation unit 201, and outputs a difference (active power deviation) between the two. At this time, the calculation unit 3a adds the inertia simulation control signal output from the inertia simulation control signal generating unit 15. The output of the calculation unit 3a is sent to a d-axis current command value calculation unit 3b. The d-axis current command value calculation unit 3b receives the output of the calculation unit 3a and outputs the d-axis current command value based on the output of the calculation unit 3a. The current command value for the d-axis is sent to the calculation unit 3c. The calculation unit 3c receives the d-axis current command value, receives the d-axis current measurement value output from the power converter dq conversion unit 2g, and outputs the d-axis current deviation as the difference between the two values out of. The d-axis current deviation is sent to the voltage command value calculation unit 2c.

[0411] Next, the voltage command value calculation unit 2c determines a voltage command value from the phase of the voltage, the d-axis current deviation and the q-axis current deviation obtained by the phase calculation unit 2b, and outputs the voltage command value (step S3 ).

[0412] Next, the two-phase-three-phase conversion unit 2d converts the voltage command value into a command value of a three-phase voltage waveform and outputs the command value (step S4).

[0413] The command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d is sent to a U-phase signal generation unit 5A, a V-phase signal generation unit 5B and a W-phase signal generation unit 5C for each of the U-phases V-phase and W-phase are sent, and U-phase, V-phase and W-phase signals are generated. These signals are given to the power converter 1 to control the input/output of the power converter 1.

[0414] As a result, for example, in a case where the power conversion device 3 discharges when the system frequency decreases, the output of the calculation unit 3a increases by the output (plus value) of the inertia simulation control signal generation unit 15, and the power converter 1 increases that to be output (discharged) power and suppresses the drop in system frequency. On the other hand, when the system frequency increases, the output of the calculation unit 3a decreases by the output (minus value) of the inertia simulation control signal generating unit 15, and the power converter 1 reduces the power to be output (discharged) and suppresses the increase in the system frequency.

[0415] Furthermore, in a case where the power conversion device 3 is charged, when the system frequency decreases, the absolute value of the output of the calculation unit 3a decreases by the output (plus value) of the inertia simulation control signal generating unit 15, and the power converter 1 decreases the (loaded) power to be entered and suppresses the decrease in system frequency. On the other hand, when the system frequency increases, the absolute value of the output of the calculation unit 3a increases by the output (minus value) of the inertia simulation control signal generating unit 15, and the power converter 1 increases the power to be input (charged) and suppresses the increase in the system frequency.

[0416] According to the eleventh embodiment, when the phase of the electrical quantity such as the system voltage fluctuates due to a frequency fluctuation or the like of an AC electrical circuit such as a power system S, the inertia simulation control signal is added to the active power control command value derived from the active power Control command value calculation unit 202 is supplied to the power control device 2 so that the electrical quantity (voltage, current, power and the like) input/output from the power conversion device 3 can be changed.

[0417] This makes it possible to realize an operation (simulating the inertial response) similar to the inertial response in the synchronous machine, so that the frequency fluctuations and oscillations of the circuit can be suppressed, which contributes to the frequency stabilization of the electric circuit.

Twelfth embodiment

[0418] Next, a twelfth embodiment will be described. Below, description of parts common to the eleventh embodiment will be omitted, and various parts will be mainly described therefor.

[0419] FIG. 30 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the twelfth embodiment. It should be noted that in FIG. 30 the same reference numbers are assigned to the same elements as in FIG. 28.

[0420] In the eleventh embodiment described above, an example has been described in which input/output (voltage, current, power, and the like) of the power conversion device 3 is changed by adding the inertia simulation control signal to the active power control command value determined by the active power control command value -Calculation unit 202 is delivered to the calculation unit 3a in the power control device 2.

[0421] On the other hand, in the twelfth embodiment, an example is described in which the input/output (voltage, current, power, and the like) of a power conversion device 3 is changed by adding an inertia simulation control signal to a d-axis current command value determined by a d-axis current command value calculation unit 3b is supplied to a calculation unit 3c.

[0422] As in the case of the eleventh embodiment, an inertia simulation control signal generating unit 15 according to the twelfth embodiment receives a signal (inertia simulation control signal) indicating a difference between a phase obtained by a phase calculation unit 2b and the phase after adjustment by a phase adjustment unit 11, and produces a value obtained by converting the value using a function (e.g. sinθ), multiplying the value by a coefficient, or converting the value to a pu value as necessary. However, the inertia simulation control signal generated by the inertia simulation control signal generating unit 15 is not added to an active power control command value supplied to a power control device 2 from an active power control command value calculation unit 202, but is added to a current command value generated in the power control device 2. For example, the inertia simulation control signal generated by the inertia simulation control signal generating unit 15 is not supplied to a calculation unit 3a but is supplied to the calculation unit 3c as shown in FIG. 30 shown. Note that the calculation performed by the inertia simulation control signal generation unit 15 is, for example, the same as the calculation performed by the inertia simulation control signal generation unit 15 of the eleventh embodiment described above.

[0423] The calculation unit 3c receives the d-axis current command value output from the d-axis current command value calculation unit 3b, receives the d-axis current measurement value output from a power converter current dq conversion unit 2g, and outputs a difference (d-axis current deviation) between the two. At this time, the calculation unit 3c adds the inertia simulation control signal output from the inertia simulation control signal generating unit 15. The d-axis current deviation is sent to a voltage command value calculation unit 2c.

[0424] The voltage command value calculation unit 2c determines a voltage command value from the phase of the voltage, the d-axis current deviation, and the q-axis current deviation determined by the phase calculation unit 2b, and outputs the voltage command value.

[0425] The two-phase-three-phase conversion unit 2d converts the voltage command value into a command value of a three-phase voltage waveform and outputs the command value (e.g., determines and outputs a value obtained by converting the α-axis voltage and the β-axis voltage command value into a three-phase alternating current command value).

- During unloading

[0426] In the present embodiment, the function when the system frequency decreases is similar to the case of the eleventh embodiment, and the value of the output of the calculation unit 3c increases by adding the value (plus value) of the inertia simulation control signal compared to that Case in which the frequency is stable and the active power output (output) of the power converter 1 also increases. The function when the system frequency increases is also similar to the case of the eleventh embodiment, and the value of the output of the calculation unit 3c decreases by the addition of the inertia simulation control signal (minus value) compared to the case where the frequency is stable, and the active power output (discharged) from the power converter 1 also decreases.

- During charging

[0427] The function when the frequency decreases during charging of the power conversion device 3 is also similar to the case of the eleventh embodiment, and the absolute value of the output (minus value) of the calculation unit 3c increases by the addition of the inertia simulation control signal (plus value). Compared to the case where the frequency is stable, and the (loaded) active power input to the power converter 1 also decreases. The function when the frequency increases is also similar to the case of the eleventh embodiment, and the absolute value of the output (minus value) of the calculation unit 3c increases by the addition of the inertia simulation control signal (minus value) compared to the case where the frequency is stable, and the active power input (loaded) into the power converter 1 also decreases.

[0428] Next, an example of the operation of the power control device 2 according to the twelfth embodiment will be described with reference to the flowchart of FIG. 31. Here, description of parts consistent with the flowchart of Fig. 29 shown in the eleventh embodiment will be omitted, and other parts will be described.

[0429] The above-described processing in steps S1, S2, S71 and S72 is also performed in the present embodiment.

[0430] The inertia simulation control signal generated by the inertia simulation control signal generating unit 15 is used to calculate a current command value generated in the power control device 2 (step S73-1).

[0431] For example, the control signal generated by the inertia simulation control signal generation unit 15 is forwarded to the calculation unit 3c. The calculation unit 3c receives the d-axis current command value output from the d-axis current command value calculation unit 3b, receives the d-axis current measurement value output from a power converter current dq conversion unit 2g, and outputs a difference ( d-axis current deviation) between the two. At this time, the calculation unit 3c adds the inertia simulation control signal output from the inertia simulation control signal generation unit 15. The d-axis current deviation is sent to the voltage command value calculation unit 2c.

[0432] Thereafter, similar processing to steps S3 and S4 described above is performed.

[0433] The command value of the three-phase voltage waveform generated by the two-phase-three-phase conversion unit 2d is sent to a U-phase signal generation unit 5A, a V-phase signal generation unit 5B and a W-phase signal generation unit 5C for each of the U -phases, V-phases and W-phases are sent, and U-phase, V-phase and W-phase signals are generated. These signals are given to a power converter 1 to control the input/output of the power converter 1.

[0434] As a result, for example, in a case where the power conversion device 3 discharges when the system frequency decreases, the output of the calculation unit 3c increases by the output (plus value) of the inertia simulation control signal generating unit 15, and the power converter 1 increases that to be output (discharged) power and suppresses the drop in system frequency. On the other hand, when the system frequency increases, the output of the calculation unit 3c decreases by the output (minus value) of the inertia simulation control signal generating unit 15, and the power converter 1 reduces the power to be output (discharged) and suppresses the increase in the system frequency.

[0435] Furthermore, in a case where the power conversion device 3 is charged, when the system frequency decreases, the absolute value of the output of the calculation unit 3c decreases by the output (plus value) of the inertia simulation control signal generating unit 15, and the power converter 1 decreases the (loaded) power to be entered and suppresses the decrease in system frequency. On the other hand, when the system frequency increases, the absolute value of the output of the calculation unit 3c increases by the output (minus value) of the inertia simulation control signal generating unit 15, and the power converter 1 increases the power to be input (charged) and suppresses the increase in the system frequency.

[0436] According to the twelfth embodiment, when the phase of the electrical quantity such as the system voltage fluctuates due to a frequency fluctuation or the like of an AC circuit such as a power system S, the electrical quantity (voltage, current, power and the like), input/output from the power conversion device 3 can be changed by adding the inertia simulation control signal to the d-axis current command value supplied from the d-axis current command value calculation unit 3b to the calculation unit 3c.

[0437] This makes it possible to realize an operation (simulating the inertial response) similar to the inertial response in the synchronous machine, so that the frequency fluctuations and oscillations of the circuit can be suppressed, which contributes to the frequency stabilization of the circuit.

[0438] In each of the above-described embodiments, an example of a case where the control target (power converter 1) of the power control device 2 is a power conversion device for a storage battery has been described. However, the present invention is not limited to this case. For example, the control target may be a power conversion device designed for an energy storage device such as an electric vehicle charging device, an electric double layer capacitor, a flywheel, a superconducting coil or a hydrogen storage device, a power generation device such as a variable speed pumped storage device, a fuel cell, a wind turbine or a solar energy system, a load such as a refrigerator, air conditioner, pump or fan or similar is used. That is, most power conversion devices can be a control target, except the power conversion device (e.g., a power conversion device for a rolling device) that requires high-precision control.

[0439] In each of the above embodiments, an example of a case in which the configuration for adjusting the phase and the like is applied to the power control device that controls the power converter 1 included in the charge/discharge device such as the battery system has been described . However, the present invention is not limited to this, and for example, as in a thirteenth embodiment described later, the present invention can also be applied to a power control device that controls a secondary exciter included in a charger/discharger. such as a variable speed pumped storage system.

Thirteenth embodiment

[0440] Next, the thirteenth embodiment will be described. Below, description of parts common to the eleventh embodiment will be omitted, and various parts will mainly be described.

[0441] FIG. 32 is a conceptual diagram showing an example of a configuration of a charger/discharger with a power conversion device according to the thirteenth embodiment. It should be noted that in FIG. 32 the same reference numbers to the same elements as in FIG. 28 are assigned. Here, an example of a case where a generator motor 6 generates electricity will be described. In addition, FIG. 32 shows a situation where the system frequency decreases in the same embodiment. In the same embodiment, the situation in which the system frequency is stable and the situation in which the system frequency increases can be easily derived from the description of each embodiment described above, so the illustration and description thereof are omitted.

[0442] In the eleventh embodiment described above, an example of a case in which the configuration for adjusting the charging/discharging power and the like is applied to the power control device 2 that controls the power converter 1 installed in the charging/discharging device has been described as intended for the battery system.

[0443] On the other hand, in the thirteenth embodiment, an example of a case in which a charging/discharging power adjustment configuration is applied to a power control device 2 that controls a secondary exciter 8 installed in a charging/discharging system such as a pumped storage facility is described -Power generation system is included.

[0444] The ones shown in FIG. 32 is, for example, a charging/discharging system of a variable speed pumped storage power generation system and includes the generator motor 6, a pump water wheel 7, the secondary exciter 8, an excitation switch E1 and an excitation transformer E2.

[0445] The primary side of the generator motor 6 is connected to the network S via a parallel switch CB and a main transformer M. The pump water wheel 7 is mechanically connected to the generator motor 6. The secondary exciter 8 is connected to the secondary winding side of the generator motor 6 and controls the generator motor 6.

[0446] The secondary exciter 8 is a part of the elements constituting a power conversion device 3. The secondary exciter 8 includes a converter 8a, a DC voltage unit 8b and an inverter 8c. One end of the power converter 8a is connected to a circuit between the main transformer M and the parallel switch CB via the power switch E1 and the excitation transformer E2. The DC voltage unit 8b is connected between the converter 8a and the inverter 8c. The inverter 8c is connected to the secondary side of the generator motor 6.

[0447] The inverter 8c controls a secondary current of the generator motor 6 in accordance with signals supplied from the power control device 2 side via a U-phase signal generation unit 5A, a V-phase signal generation unit 5B, and a W-phase signal generation unit 5C are given, and thereby carries out the feeding (pumping) and delivery (power generation) of electricity to the side of the grid system S.

[0448] The functions, processing contents and operations of the other components are similar to the eleventh embodiment described above, so the description and illustration thereof are omitted.

[0449] According to the thirteenth embodiment, even in a case where the configuration for performing the active power control using the inertia simulation control signal is applied to the power control device 2 that controls the secondary exciter 8 installed in the charging/discharging device such as the pump storage -Variable speed power generation system is included, the electrical quantity (voltage, current, power and the like) input/output from the generator motor 6 is changed.

[0450] In this way, an operation (simulation of the inertia behavior) can be realized that is similar to the inertia behavior in the synchronous machine, so that the frequency fluctuations and oscillations of the circuit can be suppressed, which contributes to the frequency stabilization of the circuit.

[0451] In the eleventh to thirteenth embodiments described above, the example in which the output signal of the inertia simulation control signal generating unit 15 is input to FIG. 3a or 3c has been described. However, the inertia simulation control signal may also be input into a path related to the active power control, for example, into an active power control command value calculation unit 202, before 3a, after 3a, before 3b, before 3c, after 3c or into a voltage command value calculation unit 2C .

[0452] Furthermore, the phase after the phase adjustment (a value obtained by applying a function or, if necessary, by multiplying a coefficient) can be added to the part of the path related to the active power control, such as 3a, 3c, the Active power control command value calculation unit 202, before 3a, after 3a, before 3b, before 3c, after 3c or the voltage command value calculation unit 2C, and the phase before phase adjustment (a value obtained by applying a function or, if necessary, by multiplying a coefficient will) can be subtracted. For example, the phase after phase adjustment can be added and the phase before phase adjustment can be subtracted in the part of the calculation unit 3a.

[0453] In the eleventh to thirteenth embodiments described above, the example in which the inertia simulation control signal generating unit 15 is disposed behind the phase adjusting unit 11 has been described. However, the function of the inertia simulation control signal generating unit 15 may be provided within the phase adjustment unit 11, or a difference (a value obtained by applying a function or multiplying a coefficient if necessary) between the value of the phase before the phase adjustment and the value of the phase after phase adjustment, which is obtained in the process of calculation of the phase adjustment unit 11, may be used instead of the output signal of the inertia simulation control signal generating unit 15. The difference between the angular velocity before application of the function calculation (first-order delay or the like) and the angular velocity after application of the function calculation (first-order delay or the like) may be used instead of the output signal of the inertia simulation control signal generating unit 15.

[0454] In the example of the thirteenth embodiment described above, the example of a variable speed pumped storage power plant was described, but the present invention can also be applied to a wind turbine for charging/discharging that includes a secondary exciter or a power control device that includes a secondary exciter Flywheel generator engine controls. Further, the present invention can be applied to a power control device that controls a secondary exciter included in a charging/discharging system that includes a prime mover such as a water wheel or a turbine instead of a pump water wheel and a generator instead of a generator-motor. The present invention can be applied to a power control device that controls a secondary exciter included in a load system that includes a load such as a pump or a fan instead of a pump water wheel and an electric motor instead of a generator motor.

[0455] In the eleventh to thirteenth embodiments described above, an example in which the power control device 2 and the voltage signal generating unit (the U-phase signal generating unit 5A or the like) are separated has been described. However, the functions of the power control device 2 and the voltage signal generating unit may be included in a control device or a control unit. Furthermore, a plurality of components (various calculation units and the like) in the power control device 2 may be integrated into one component, or one or more components in the power control device 2 may be provided outside the power control device 2.

Specific calculation example in the main part of the power control device 2 (Part 1)

[0456] FIG. 33 is a diagram for explaining a specific calculation example (part 1) in the main part of the power control device 2 described in the first embodiment. Here, elements similar to those in FIG. 1 match, marked with the same reference numbers. Note that the specific calculation example described here is not limited to the power control device 2 described in the first embodiment, and can also be applied to the power control device 2 described in each of the second to thirteenth embodiments by modifying it accordingly. The specific example can be applied to the second to fifth embodiments, for example, by providing a function of changing the position of the phase adjustment unit or changing the output signal (phase) of the phase adjustment unit into a signal after phase adjustment (signal whose amplitude is the same as that of the phase adjustment unit). Input signal and whose phase is only adjusted) is provided. The specific example can be applied to embodiments 6-1 to 6-5, 7-1 to 7-5, 9-1, 9-2, 10-1 and 10-2 by providing the phase adjustment unit with a function of switching, for example a function or for changing a coefficient by a function switching command or a coefficient switching command. The specific example can be applied, for example, to Embodiments 8-1 to 8-5, 9-3 and 10-3 by adding a bypass circuit outside the phase adjustment unit and providing a switch for switching between using and not using the phase adjustment unit. The specific example can be applied to the eleventh to thirteenth embodiments, for example, by inputting the output signal of the phase adjustment unit 11 into the inertia simulation control signal generating unit 15 instead of inputting the output signal into the voltage command value calculation unit 2c and inputting the output of the phase calculation unit 2b into the phase adjustment unit 11 and the voltage command value calculation unit 2c.

[0457] The ones shown in FIG. 33 includes a phase calculation unit 12A, a θα calculation unit 12B, a phase adjustment unit 11, a voltage command value calculation unit 2c, and a two-phase-three-phase conversion unit 2d.

[0458] In order not to complicate the drawing, in FIG. 33 omits the representation of the system voltage measuring unit 2a described above, and the representation of the other elements 2f, 2g, 3a, 3b, 3c, 3d, 3e and 3f is also omitted. The system voltage measurement unit 2a described above may be included in the phase calculation unit 12A. The phase calculation unit 12A and the θα calculation unit 12B are elements constituting the phase calculation unit 2b described above.

[0459] The phase calculation unit 12A receives the three-phase AC voltages Vu, Vv and Vw output from the above-described transducer VT, performs αβ conversion, and outputs an α-axis voltage Vα and a β-axis voltage Vβ. An example of the αβ conversion formula is described below. Vα = (2/3) · {Vu - (Vv + Vw)/2} Vβ = (1/√3) · (Vv - Vw)

[0460] The θα calculation unit 12B receives the α-axis voltage Vα and the β-axis voltage Vβ, determines a phase θα, and outputs a phase θα.

[0461] An example of a calculation formula for the phase θα is described below. θα = arcsin[Vβ/{√(Vα2 + Vβ2)}]

[0462] The phase adjustment unit 11 performs calculations for adjusting the phase θα, and obtains and outputs a phase (adjusted phase) θαlag after the phase adjustment. That is, the phase adjusting unit 11 generates the adjusted phase θα lag of the phase θα. A specific example of the calculation performed by the phase adjustment unit 11 will be described in detail later.

[0463] The voltage command value calculation unit 2c obtains and outputs the α-axis voltage command value Vαlag and the β-axis voltage command value Vβlag after the phase adjustment using the adjusted phase θαlag. It should be noted that Vα, Vβ, Vαlag and Vβlag after conversion are voltages that change sinusoidally, and even if the frequency is constant, the values of θα and θαlag change with time at an angular velocity corresponding to the frequency.

[0464] The two-phase-three-phase conversion unit 2d obtains and outputs the three-phase AC voltages Vulag, Vvlag and Vwlag after phase adjustment using the α-axis voltage command value Vαlag and the β-axis voltage command value Vβlag after phase adjustment.

Examples of the formulas of Vulag, Vvlag and Vwlag are described below. For easier understanding, a comparison of the expressions of the three-phase AC voltage waveforms before and after phase adjustment is shown here using a formula for a general three-phase AC voltage without considering the influence of the voltage command value. Vulag = Vup · sin(θαlag) Vvlag = Vvp sin(θαlag - 2 π/3) Vwlag = Vwp sin(θαlag - 4 π/3)

[0466] Note that Vup, Vvp and Vwp are amplitude values of Vu, Vv and Vw. In a case where the amplitude values of Vu, Vv and Vw are the same, Vup can be used in place of Vvp and Vwp, Vvp in place of Vup and Vwp, and Vwp in place of Vup and Vvp. where: Vu = Vup sin (θα) Vv = Vvp sin (θα - 2 π/3) Vw = Vwp sin (θα - 4 π/3)

[0467] Therefore, the phase difference between Vu and Vulag, between Vv and Vvlag and between Vw and Vwlag is θαlag - θα. The active power generated between the power conversion device 3 and the network S is expressed, for example, by the following formula. P = (Vi · Vs/X) · sin(θα) Plag = (Vi · Vs/X) · sin(θαlag) where: P: active power without phase adjustment Plag: active power with phase adjustment Vi: output voltage of the power conversion device Vs: system voltage X: impedance between energy conversion device and system.

[0468] Therefore, the relationship between θαlag, (θαlag - θα), P and Plag is as follows.

[0469] If π/2 > θαlag > 0 and (θαlag - θα) > 0, Plag (output) > P (output)

[0470] If π/2 > θαlag > 0 and (θαlag - θα) < 0, Plag (output) < P (output)

[0471] If 0 > θαlag > - π/2 and (θαlag - θα) > 0, Plag (input) < P (input)

[0472] If 0 > θαlag > - π/2 and (θαlag - θα) < 0, Plag (input) > P (input) where: P (output): active power output from the power conversion device when no phase adjustment is made Plag (output): active power output from the power conversion device when phase adjustment is made P (input): active power input to the power conversion device when no phase adjustment is made Plag (Input): Active power input into the power conversion device when phase adjustment is made.

[0473] In a case where the system frequency decreases while the power conversion device 3 discharges (discharges active power), θαlag > θα, that is, (θαlag - θα) > 0, so that the power of the power conversion device increases and the decrease in the system frequency is suppressed becomes.

[0474] In a case where the system frequency increases while the power conversion device 3 discharges (discharges active power), θαlag <θα, that is, H. (θαlag - θα) < 0, so that the performance of the power conversion device decreases and the increase in the system frequency is suppressed.

[0475] In a case where the system frequency decreases while the power conversion device 3 is being charged (obtaining active power), θαlag > θα, i.e. H. (θαlag - θα) > 0, so that the input to the power conversion device decreases and the drop in system frequency is suppressed.

[0476] In a case where the system frequency increases while the power conversion device 3 is being charged (receiving active power), θαlag <θα, that is, H. (θαlag - θα) < 0, so that the input to the power conversion device increases and the increase in system frequency is suppressed.

[0477] In the above example, the example in which the phase θα changes with the frequency change of the system has been described. However, a similar effect can also be obtained in a case where the frequency does not change and the phase θα changes with the change in the power flow of the system or the like. The input/output of the power conversion device increases or decreases with the frequency change and phase change of the system voltage, and the frequency change and phase change of the system are suppressed, so that the inertial response of the synchronous machine can be simulated.

[0478] By applying the function of adjusting the phase θα to the calculation of the phase adjusting unit 11 in the power control device 2, the waveforms W2 and W3 in FIG. 7B also have a desirable response to the change in system frequency.

[0479] In the above example, the case where the αβ conversion is applied to the phase calculation unit 12A has been described, but the system voltage phase may be determined by another method (e.g., PLL calculation) instead of the αβ conversion, and the adjusted one phase can be obtained. Specific calculation example in the main part of the power control device 2 (Part 2)

[0480] FIG. 34 is a diagram for explaining a specific calculation example (part 2) in the main part of the power control device 2 described in the first embodiment.

[0481] In FIG. 34 are elements similar to those in FIG. 1 match, marked with the same reference numbers. Note that the specific calculation example described here is not limited to the power control device 2 described in the first embodiment, and can also be applied to the power control device 2 described in the second to thirteenth embodiments by modifying it accordingly. The specific example can be applied to the second to fifth embodiments, for example, by providing a function of changing the position of the phase adjustment unit or changing the output signal (phase) of the phase adjustment unit into a signal after phase adjustment (signal whose amplitude is the same as that of the phase adjustment unit). Input signal and whose phase is only adjusted) is provided. The specific example can be applied to embodiments 6-1 to 6-5, 7-1 to 7-5, 9-1, 9-2, 10-1 and 10-2 by providing the phase adjustment unit with a function of switching, for example a function or for changing a coefficient by a function switching command or a coefficient switching command. The specific example can be applied, for example, to Embodiments 8-1 to 8-5, 9-3 and 10-3 by adding a bypass circuit outside the phase adjustment unit and providing a switch for switching between using and not using the phase adjustment unit. The specific example can be applied to the eleventh to thirteenth embodiments, for example, by inputting the output signal of the phase adjustment unit 11 into the inertia simulation control signal generating unit 15 instead of inputting the output signal into the voltage command value calculation unit 2c and inputting the output of the phase calculation unit 2b into the phase adjustment unit 11 and the voltage command value calculation unit 2c.

[0482] The ones shown in FIG. 34 includes a constant frequency signal generating unit 12C, a phase calculation unit 12D, a θd calculation unit 12E, a phase adjustment unit 11, a voltage command value calculation unit 2c, and a two-phase-three-phase conversion unit 2d.

[0483] To avoid complicating the drawing, in FIG. 34 omits the representation of the system voltage measuring unit 2a described above, and the representation of the other elements 2f, 2g, 3a, 3b, 3c, 3d, 3e and 3f is also omitted. The system voltage measurement unit 2a described above may be included in the phase calculation unit 12D. The constant frequency signal generation unit 12C, the phase calculation unit 12D and the θd calculation unit 12E are elements constituting the above-described phase calculation unit 2b.

[0484] The constant frequency signal generating unit 12C generates an electrical signal (e.g., a constant frequency signal of 50 Hz) fc having a constant frequency.

[0485] The phase calculation unit 12D receives the three-phase AC voltages Vu, Vv and Vw output from the above-described transducer VT, receives the constant frequency signal fc output from the constant frequency signal generation unit 12C, performs dq conversion (rotational coordinate conversion). and outputs a d-axis voltage Vd and a q-axis voltage Vq.

[0486] An example of the dq conversion formula is described below. Vd = (2/3) · {cos (θc) • Vu + cos (θc - 2 · π/3) · Vv + cos (θc - 4 · π/3) · Vw} Vq = - (2/3) · {sin(θc) · Vu + sin(θc - 2 · π/3) · Vv + sin(θc - 4 · π/3) · Vw} where: θc: phase of the constant frequency signal fc (instead of the phase of the constant frequency signal fc, an average value, a moving average value, a median value or the like of the voltage phase measured by the measuring transducer VT can also be used).

[0487] The θd calculation unit 12E receives the d-axis voltage Vd and the q-axis voltage Vq, and determines and outputs a phase θd.

[0488] An example of a calculation formula for the phase θd is described below. θd = arcsin[Vq/{√(Vd2 + Vq2)}]

[0489] The phase adjustment unit 11 performs calculations for adjusting the phase θd, and determines and outputs a phase (adjusted phase) θdlag after the phase adjustment. That is, the phase adjusting unit 11 generates the adjusted phase θdlag of the phase θd. A specific example of the calculation performed by the phase adjustment unit 11 will be described in detail later.

[0490] The voltage command value calculation unit 2c obtains and outputs the d-axis voltage command value Vdlag and the q-axis voltage command value Vqlag after the phase adjustment using the adjusted phase θdlag. When the frequencies of Vu, Vv and Vw coincide with the constant frequency signal fc, Vd and Vq have constant values after conversion, and the values of θd and θdlag do not change. In a case where the frequencies of Vu, Vv and Vw deviate from the constant frequency signal fc, the values of θd and θdlag change at angular velocities corresponding to the differences between the frequencies of Vu, Vv and Vw and the frequency of the Signal with constant frequency fc correspond.

[0491] The two-phase-three-phase conversion unit 2d obtains and outputs the three-phase AC voltages Vulag, Vvlag and Vwlag after phase adjustment using the d-axis voltage command value Vdlag and the q-axis voltage command value Vqlag after phase adjustment.

Examples of the formulas of Vulag, Vvlag and Vwlag are described below. For easier understanding, a comparison of the expressions of the three-phase AC voltage waveforms before and after phase adjustment is shown here using a formula for a general three-phase AC voltage without considering the influence of the voltage command value. Vulag = Vup sin(θc + θdlag) Vvlag = Vvp sin(θc + θdlag - 2π/3) Vwlag = Vwp sin(θc + θdlag - 4 π/3)

[0493] Note that Vup, Vvp and Vwp are amplitude values of Vu, Vv and Vw. In a case where the amplitude values of Vu, Vv and Vw are the same, Vup can be used in place of Vvp and Vwp, Vvp in place of Vup and Vwp, and Vwp in place of Vup and Vvp. where: Vu = Vup · sin (θc + θd) Vv = Vvp sin (θc + θd - 2 π/3) Vw = Vwp sin (θc + θd - 4 π/3)

[0494] Therefore, the phase difference between Vu and Vulag, between Vv and Vvlag and between Vw and Vwlag is θdlag - θd.

[0495] The active power generated between the power conversion device 3 and the network S is expressed, for example, by the following formula. P = (Vi · Vs/X) · sin (θd) Plag = (Vi · Vs/X) · sin(θdlag) where: P: active power without phase adjustment Plag: active power with phase adjustment Vi: output voltage of the power conversion device Vs: system voltage X: impedance between power conversion device and system.

[0496] Therefore, the relationship between θdlag, (θdlag - θd), P and Plag is as follows.

[0497] If π/2 > θdlag > 0 and (θdlag - θd) > 0, Plag (output) > P (output)

[0498] If π/2 > θdlag > 0 and (θdlag - θd) < 0, Plag (output) < P (output)

[0499] If 0 > θdlag > - π/2 and (θdlag - θd) > 0, Plag (input) < P (input)

[0500] If 0 > θdlag > - π/2 and (θdlag - θd) < 0, Plag (input) > P (input) where: P (output): active power output from the power conversion device when no phase adjustment is made Plag (output): active power output from the power conversion device when phase adjustment is made P (input): active power input to the power conversion device when no phase adjustment is made Plag (Input): Active power input into the power conversion device when phase adjustment is made.

[0501] In a case where the system frequency decreases while the power conversion device 3 discharges (discharges active power), θdlag > θd, that is, (θdlag - θd) > 0, so that the power of the power conversion device 3 increases and the decrease in the system frequency is suppressed.

[0502] In a case where the system frequency increases while the power conversion device 3 discharges (discharges active power), θdlag < θd, i.e. H. (θdlag - θd) < 0, so that the performance of the power conversion device 3 decreases and the increase in the system frequency is suppressed.

[0503] In a case where the system frequency decreases while the power conversion device 3 is being charged (receiving active power), θdlag > θd, that is, (θdlag - θd) > 0, so that the input to the power conversion device 3 decreases and the drop the system frequency is suppressed.

[0504] In a case where the system frequency increases while the power conversion device 3 is being charged (receiving active power), θdlag < θd, i.e. (θdlag - θd) < 0, so that the input to the power conversion device 3 increases and the increase in System frequency is suppressed.

[0505] In the above example, the example in which the phase θd changes with the frequency change of the system has been described. However, a similar effect can also be obtained in a case where the frequency does not change and the phase changes with the change in the power flow of the system or the like. The input/output of the power conversion device 3 increases or decreases with the frequency change and the phase change of the system voltage, and the frequency change and the phase change of the system are suppressed, so that the inertia behavior of the synchronous machine can be simulated.

[0506] By applying the function of adjusting the phase θd to the calculation of the phase adjusting unit 11 in the power control device 2, the waveforms W2 and W3 in FIG. 7B also have desirable responsiveness to the change in system frequency.

[0507] In the above example, the case that the dq conversion is applied to the phase calculation unit 12A has been described, but the system voltage phase may be determined by another method (e.g., PLL calculation; phase-locked loop) instead of the dq conversion , and the adjusted phase can be obtained.

Specific examples 1-1 and 1-2 for calculation in the phase adjustment unit 11

(Specific Example 1-1)

[0508] FIG. 35A is a diagram for explaining a specific calculation example 1-1 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0509] One in FIG. Phase adjustment unit/function calculation unit F0 shown in FIG. 35A includes an angular velocity calculation unit 13A and a phase adjustment function processing unit 13B, and performs the following calculation.

- In the event that the input in FIG. 35A θα is

[0510] The angular velocity calculation unit 13A receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0511] The phase adjustment function processing unit 13B receives the angular velocity ωα of the phase θα output from the angular velocity calculation unit 13A and the phase θα, calculates a phase θαlag adjusted with a function that tracks a change in the angular velocity ωα, and outputs the calculated value out of.

- In the event that the input in FIG. 35A θd is

[0512] The angular velocity calculation unit 13A receives a phase θd, calculates an angular velocity ωd of the phase θd, and outputs the angular velocity ωd.

[0513] The phase adjustment function processing unit 13B receives the angular velocity ωd of the phase θd output from the angular velocity calculation unit 13A and the phase θd, calculates a phase θdlag adjusted using a function that tracks a change in the angular velocity ωd, and outputs the calculated value out of.

[0514] According to the example of FIG. 35A, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by applying the function tracking the change in the angular velocity ωα of the phase θα or the angular velocity ωd of the phase θd to the calculation processing performed in the phase adjustment unit 11.

(Specific example 1-2)

[0515] FIG. 35B is a diagram for explaining a specific calculation example 1-2 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0516] One in FIG. Phase adjustment unit/function calculation unit F0 shown in FIG. 35B includes a phase change amount calculation unit 13C and a phase adjustment function processing unit 13D, and performs the following calculation.

- In the event that the input in FIG. 35B θα is

[0517] The phase change amount calculation unit 13C receives the phase θα and calculates and outputs a change amount Δθα of the phase θα.

[0518] The phase adjustment function processing unit 13D receives the change amount Δθα output from the phase change amount calculation unit 13C and the phase θα, calculates a phase θαlag adjusted with a function that tracks the change in the change amount Δθα, and outputs the calculated one value.

- In the event that the input in FIG. 35B θd

[0519] The phase change amount calculation unit 13C receives the phase θd and calculates and outputs a change amount Δθd of the phase θd.

[0520] The phase adjustment function processing unit 13D receives the change amount Δθd output from the phase change amount calculation unit 13C and the phase θd, calculates a phase θdlag adjusted using a function that tracks the change in the change amount Δθd, and outputs the calculated value and outputs the calculated value.

[0521] According to the example of FIG. 35B, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by applying the function tracking the change amount Δθα of the phase θα or the change amount Δθd of the phase θd to the calculation processing performed in the phase adjustment unit 11.

Specific examples 2-1 and 2-2 for calculation in the phase adjustment unit 11

(Specific Example 2-1)

[0522] FIG. 36A is a diagram for explaining a specific calculation example 2-1 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0523] A phase adjustment unit/function calculation unit F0 in FIG. 36A includes an angular velocity calculation unit 13A, a first-order delay calculation unit 13E, and a Δt multiplication unit 13F, and performs the following calculation.

- In the event that the input in FIG. 36Aθα

[0524] The angular velocity calculation unit 13A receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0525] The first-order delay calculation unit 13E receives the angular velocity ωα of the phase θα output from the angular velocity calculation unit 13A, calculates a phase adjustment signal ωαdif1 using a calculation containing a function corresponding to the angular velocity ωα lags by a first order and outputs the calculated value.

[0526] The Δt multiplication unit 13F receives the signal ωαdif1 output from the first-order delay calculation unit 13E, multiplies ωαdif1 by a step time Δt, converts the angular velocity into the phase change amount, and outputs the result. A calculation unit 130 determines a value obtained by adding the output of the Δt multiplication unit 13F and the phase θα, and outputs the determined value as an adjusted phase θαlag outside the phase adjustment unit 11.

[0527] In the example above, an example was described in which ωαdif1 is multiplied by Δt in order to convert the angular velocity into the amount of phase change. However, for various variables, a dimensionless amount such as a pu value may be used, and the Δt multiplication unit 13F may be omitted.

- In the event that the input in FIG. 36A θd

[0528] The angular velocity calculation unit 13A receives a phase θd, calculates an angular velocity ωd of the phase θd, and outputs the angular velocity ωd.

[0529] The first-order deceleration calculation unit 13E receives the angular velocity ωd of the phase θd output from the angular velocity calculation unit 13A, calculates a phase adjustment signal ωddif1 using a calculation with a function that lags the angular velocity ωd by a first order, and outputs the calculated value.

[0530] The Δt multiplication unit 13F receives the signal ωddif1 output from the first-order delay calculation unit 13E, multiplies ωddif1 by a step time Δt, converts the angular velocity into the phase change amount, and outputs the result. The calculation unit 130 obtains a value obtained by adding the output of the Δt multiplication unit 13F and the phase θd, and outputs the obtained value as an adjusted phase θdlag to the outside of the phase adjustment unit 11.

[0531] In the example above, an example was described in which ωddif1 is multiplied by Δt in order to convert the angular velocity into the amount of phase change. However, for various variables, a dimensionless amount such as a pu value may be used, and the Δt multiplication unit 13F may be omitted.

[0532] According to the example of FIG. 36A, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by applying the calculation including the function that lags the angular velocity ωα of the phase θα or the angular velocity ωd of the phase θd by a first order to the calculation processing performed in the phase adjustment unit 11.

(Specific Example 2-2)

[0533] FIG. 36B is a diagram for explaining a specific calculation example 2-2 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0534] One in FIG. Phase adjustment unit/function calculation unit F0 shown in FIG. 36B includes a phase change amount calculation unit 13C and a first-order delay calculation unit 13G, and performs the following calculation.

- In the event that the input in FIG. 36B θα is

[0535] The phase change amount calculation unit 13C receives the phase θα and calculates and outputs a change amount Δθα of the phase θα.

[0536] The first-order delay calculation unit 13G receives the change amount Δθα of the phase θα output from the phase change amount calculation unit 13C, calculates a phase adjustment signal Δθαif1 using a calculation with a function that lags the change amount Δθα by a first order, and outputs the calculated one value.

[0537] A calculation unit 130 obtains a value resulting from the addition of the output of the first-order delay calculation unit 13G and the phase θα, and outputs the value as an adjusted phase θαlag to the outside of the phase adjustment unit 11.

- In the event that the input in FIG. 36B θd is

[0538] The phase change amount calculation unit 13C receives the phase θd and calculates and outputs a change amount Δθd of the phase θd.

[0539] The first-order delay calculation unit 13G receives the change amount Δθd of the phase θd output from the phase change amount calculation unit 13C, calculates a phase adjustment signal Δθdif1 using a calculation including a function that lags the change amount Δθd by a first order, and outputs the calculated value out of.

[0540] The calculation unit 130 determines a value obtained by adding the output of the first-order delay calculation unit 13G and the phase θd, and outputs the determined value as an adjusted phase θdlag to the outside of the phase adjustment unit 11.

[0541] According to the example of FIG. 36B, waveforms W2 and W3 of FIG. 7B have a desirable responsiveness to the change in the system frequency by applying the calculation including the function tracking the change amount Δθα of the phase θα or the change amount Δθd of the phase θd by a first order to the calculation processing performed in the phase adjustment unit 11.

Specific examples 2-3 and 2-4 for calculation in the phase adjustment unit 11

(Specific example 2-3)

[0542] FIG. 37A is a diagram for explaining a specific calculation example 2-3 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0543] FIG. 37A shows a modification of FIG. 36A.

[0544] A phase adjustment unit/function calculation unit F0 in FIG. 37A includes an angular velocity calculation unit 13A, a second-order delay calculation unit 13H, and a Δt multiplication unit 13F, and performs the following calculation.

- In the event that the input in FIG. 37A θα is

[0545] The angular velocity calculation unit 13A receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0546] The second-order delay calculation unit 13H receives the angular velocity ωα of the phase θα output from the angular velocity calculation unit 13A, calculates a phase adjustment signal ωαdif using a calculation with a function tracking the angular velocity ωα by a second order, and outputs the calculated one value.

[0547] The Δt multiplication unit 13F receives the ωαdif2 output from the second-order delay calculation unit 13H, multiplies ωαdif2 by a step time Δt, converts the angular velocity into the phase change amount, and outputs the result. A calculation unit 130 determines a value obtained by adding the output of the Δt multiplication unit 13F and the phase θα, and outputs the obtained value as an adjusted phase θαlag to the outside of the phase adjustment unit 11.

[0548] In the example above, an example was described in which ωαdif2 is multiplied by Δt in order to convert the angular velocity into the amount of phase change. However, for various variables, a dimensionless amount such as a pu value may be used, and the Δt multiplication unit 13F may be omitted.

- In the event that the input in FIG. 37A θd is

[0549] The angular velocity calculation unit 13A receives a phase θd, calculates an angular velocity ωd of the phase θd, and outputs the angular velocity ωd.

[0550] The second-order deceleration calculation unit 13H receives the angular velocity ωα of the phase θd output from the angular velocity calculation unit 13A, calculates a phase adjustment signal ωddif2 using a calculation containing a function that lags the angular velocity ωd by a second order, and outputs the calculated value out of.

[0551] The Δt multiplication unit 13F receives the output ωddif2 from the delay calculation unit 13H, multiplies ωddif2 by a step time Δt, converts the angular velocity into the phase change amount, and outputs the result. The calculation unit 130 obtains a value obtained by adding the output of the Δt multiplication unit 13F and the phase θd, and outputs the obtained value as an adjusted phase θdlag to the outside of the phase adjustment unit 11.

[0552] In the example above, an example was described in which ωddif2 is multiplied by Δt in order to convert the angular velocity into the amount of phase change. However, for various variables, a dimensionless amount such as a pu value may be used, and the Δt multiplication unit 13F may be omitted.

[0553] According to the example of FIG. 37A, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by applying the calculation including the function that lags the angular velocity ωα of the phase θα or the angular velocity ωd of the phase θd by a second order to the calculation processing performed in the phase adjustment unit 11.

(Specific Example 2-4)

[0554] FIG. 37B is a diagram for explaining a specific calculation example 2-4 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0555] FIG. 37B shows a modification of FIG. 36B.

[0556] One in FIG. 37B phase adjustment unit/function calculation unit F0 includes a phase change amount calculation unit 13C and a second-order delay calculation unit 131, and performs the following calculation.

- In the event that the input in FIG. 37B θα is

[0557] The phase change amount calculation unit 13C receives the phase θα and calculates and outputs a change amount Δθα of the phase θα.

[0558] The second-order delay calculation unit 131 receives the change amount Δθα of the phase θα output from the phase change amount calculation unit 13C, calculates a phase adjustment signal Δαdif2 using a calculation including a function that lags the change amount Δθα by a second order, and outputs the calculated value out of.

[0559] A calculation unit 130 obtains a value obtained by adding the output of the second-order delay calculation unit 131 and the phase θα, and outputs the value as an adjusted phase θαlag to the outside of the phase adjustment unit 11.

- In the event that the input in FIG. 37B θd is

[0560] The phase change amount calculation unit 13C receives the phase θd and calculates and outputs a change amount Δθd of the phase θd.

[0561] The second-order delay calculation unit 131 receives the change amount Δθd of the phase θd output from the phase change amount calculation unit 13C, calculates a phase adjustment signal Δθddif2 using a calculation including a function that lags the change amount Δθd by a second order, and outputs the calculated value out of.

[0562] The calculation unit 130 obtains a value obtained by adding the output of the second-order delay calculation unit 131 and the phase θd, and outputs the obtained value as an adjusted phase θdlag to the outside of the phase adjustment unit 11.

[0563] According to the example of FIG. 37B, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by applying the calculation including the function that lags the change amount Δθα of the phase θα or the change amount Δθd of the phase θd by a second order to the calculation processing performed in the phase adjustment unit 11. Specific examples 2-5 and 2-6 for calculation in the phase adjustment unit 11

(Specific Example 2-5)

[0564] FIG. 38A is a diagram for explaining a specific calculation example 2-5 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0565] FIG. 38A shows a modification of FIG. 36A or FIG. 37A.

[0566] One in FIG. Phase adjustment unit/function calculation unit F0 shown in Fig. 38A includes an angular velocity calculation unit 13A, a first and second order delay calculation unit 13J, and a Δt multiplication unit 13F, and performs the following calculation.

- In the event that the input in FIG. 38A θα is

[0567] The angular velocity calculation unit 13A receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0568] The first and second order delay calculation unit 13J receives the angular velocity ωα of the phase θα output from the angular velocity calculation unit 13A, calculates a phase adjustment signal ωαlag12 using a calculation containing a function corresponding to the angular velocity ωα by a first and a second Order lags behind and outputs the calculated value.

[0569] The Δt multiplication unit 13F receives the ωαlag12 output from the first- and second-order delay calculation unit 13J, multiplies the ωαlag12 by a step time Δt, converts the angular velocity into the phase change amount, and outputs the result. A calculation unit 130 determines a value obtained by adding the output of the Δt multiplication unit 13F and the phase θα, and outputs the determined value as an adjusted phase θαlag outside the phase adjustment unit 11.

[0570] In the example above, an example was described in which ωαlag12 is multiplied by Δt in order to convert the angular velocity into the amount of phase change. However, for various variables, a dimensionless amount such as a pu value may be used, and the Δt multiplication unit 13F may be omitted.

- In the event that the input in FIG. 38A θd is

[0571] The angular velocity calculation unit 13A receives a phase θd, calculates an angular velocity ωd of the phase θd, and outputs the angular velocity ωd.

[0572] The first- and second-order deceleration calculation unit 13J receives the angular velocity ωd of the phase θd output from the angular velocity calculation unit 13A, determines a first-order deceleration value and a second-order deceleration value of the angular velocity ωd using a calculation, which includes a function that tracks the angular velocity ωd by a first order and a second order, and calculates and outputs a phase adjustment signal ωdlag12.

[0573] The Δt multiplication unit 13F receives the wdlag12 output from the first-order and second-order delay calculation unit 13J, multiplies ωdlag12 by a step time Δt, converts the angular velocity into the phase change amount, and outputs the result. The calculation unit 130 determines a value obtained by adding the output of the Δt multiplication unit 13F and the phase θd, and outputs the determined value as an adjusted phase shift to the outside of the phase adjustment unit 11.

[0574] In the example above, an example was described in which ωdlag12 is multiplied by Δt to convert the angular velocity into the amount of phase change. However, for various variables, a dimensionless amount such as a pu value may be used, and the Δt multiplication unit 13F may be omitted.

[0575] According to the example of FIG. 38A, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by applying the calculation including the function that lags the angular velocity ωα of the phase θα or the angular velocity ωd of the phase θd by a first order and a second order to the calculation processing performed in the phase adjustment unit 11 is applied.

(Specific Example 2-6)

[0576] FIG. 38B is a diagram for explaining a specific calculation example 2-6 applied to the phase adjustment unit 11 in FIG. 33 or the phase adjustment unit 11 in FIG. 34 is applicable.

[0577] FIG. 38B shows a modification of FIG. 36B or FIG. 37B.

A phase adjustment unit/function calculation unit F0 shown in Fig. 38B includes a phase change amount calculation unit 13C and a first- and second-order delay calculation unit 13K, and performs the following calculation.

- In the event that the input in FIG. 38B θα is

[0579] The phase change amount calculation unit 13C receives the phase θα and calculates and outputs a change amount Δθα of the phase θα.

[0580] The first- and second-order delay calculation unit 13K receives the change amount Δθα of the phase θα output from the phase change amount calculation unit 13C, calculates a phase adjustment signal Δθαlag12 using a calculation containing a function corresponding to the change amount Δθα by one first and second order follows, and outputs the calculated value.

- In the event that the input in FIG. 38B θd is

[0581] The phase change amount calculation unit 13C receives the phase θd and calculates and outputs a change amount Δθd of the phase θd.

[0582] The first- and second-order delay calculation unit 13K receives the change amount Δθd of the phase θd output from the phase change amount calculation unit 13C, calculates a phase adjustment signal Δθdlag12 using a calculation including a function corresponding to the change amount Δθd by a first and one second order lags and outputs the calculated value.

[0583] According to the example of FIG. 38B, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by setting the function including the first-order delay calculation and the second-order delay calculation of the change amount Δθα of the phase θα or the change amount Δθd of the phase θd to those in the phase adjustment unit 11 calculation processing performed is applied.

Specific examples 3-1 and 3-2 for calculation in the phase adjustment unit 11

(Specific Example 3-1)

[0584] FIG. 39A is a diagram for explaining a specific calculation example 3-1 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 39A θd can be easily analogized from the contents of Specific Example 3-1 described below, and therefore the description thereof is omitted here.

[0585] One in FIG. 39A shown phase adjustment unit/function calculation unit F0 includes a ωα calculation unit (angular velocity calculation unit) 13A', a first order ωα delay calculation unit 13E', a Kα1 multiplication unit AA, a Kα multiplication unit AB, a subtraction unit AC, a Δt multiplication unit 13F' and a Addition unit AD and performs the following calculation.

[0586] The ωα calculation unit 13A' receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0587] The first-order ωα deceleration calculation unit 13E' receives the angular velocity ωα output from the ωα calculation unit 13A', calculates a first-order deceleration ωαlag1 of the angular velocity ωα using a function that lags the angular velocity ωα by a first order, and outputs the calculated value.

[0588] The Kα1 multiplication unit AA multiplies the first-order delay ωαlag1 of the angular velocity ωα output from the first-order ωα delay calculation unit 13E' by a coefficient Kα1 to output Kα1 · ωαlag1.

[0589] The Kα multiplication unit AB multiplies the angular velocity ωα output from the ωα calculation unit 13A' by the coefficient Kα and outputs Kα · ωαlag1.

[0590] The subtraction unit AC subtracts the output Kα · ωα from the Kα multiplication unit AB from the output Kα1 · ωαlag1 from the Kα1 multiplication unit AA and outputs the difference between the two (Kα1 · ωαlag1 - Kα · ωα).

[0591] The Δt multiplication unit 13F' receives (Kα1 · ωαlag1 - Kα · ωα) output from the subtraction unit AC, multiplies (Kα1 · ωαlag1 - Kα · ωα) by a step time Δt, converts the angular velocity into the phase change amount, and outputs ( Kα1 · Δθαlag1 - Kα · Δθα).

[0592] The addition unit AD adds the phase θα to (Kα1 - Δθαlag1 - Kα - Δθα) output from the Δt multiplication unit 13F', and outputs the result as the adjusted phase θαlag to the outside of the phase adjustment unit 11. Note that a dimensionless amount such as a pu value can be used for various variables and the Δt multiplication unit 13F' can be omitted.

[0593] For the sake of simplicity, a case in which Kα = Kα1 = 1 is described here as an example. For example, in a case where the system frequency decreases, the value of the angular velocity ωα of the phase θα decreases. Since the value of ωαlag1, which is a first-order delay of ωα, decreases more slowly than the value of ωα, ωαlag1 > ωα, the value of (ωαlag1 - ωα) is positive (plus), and the value (Δθαlag1 - Δθα) , which is obtained by multiplying (ωαlag1 - ωα) by Δt, is also positive (plus). Since θαlag is a value obtained by adding θα and (Δθαlag1 - Δθα), θαlag > θα.

[0594] In a case where the system frequency increases, the value of ωα increases. Since the value of ωαlag1, which is a first-order delay of ωα, increases more slowly than the value of ωα, ωαlag1 < ωα, the value of (ωαlag1 - ωα) is negative (minus), and the value (Δθαlag1 - Δθα), which is obtained by multiplying (ωαlag1 - ωα) by Δt is also negative (minus). Since θαlag is a value obtained by adding θα and (Δθαlag1 - Δθα) (negative value), θαlag < θα.

[0595] In a case where the decrease or increase in the system frequency converges and the frequency becomes constant, the value of ωαlag1 approaches the value of ωα. In a case where a sufficiently long time elapses with respect to the first-order delay time constant after the frequency becomes constant, ωαlag1 ≈ ωα, i.e. H. (ωαlag1 - ωα) ≈ 0, and θαlag ≈ θα.

[0596] Although the case Kα = Kα1 = 1 has been described here, Kα and Kα1 can have values other than 1. In a case where the value of the coefficient of the coefficient multiplication unit is 1, the coefficient multiplication unit may be omitted. In addition, the coefficient multiplication unit may be provided in a subsequent stage of the subtraction unit AC or a subsequent stage of the Δt multiplication unit 13F'.

[0597] According to the example of FIG. 39A, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by applying a combination of various calculation elements, including a function that lags the angular velocity ωα of the phase θα by a first order, to the calculation processing performed in the phase adjustment unit 11.

[0598] In the above example, an example in which the phase θα is obtained by αβ conversion and θαlag has been described, but a similar effect can also be obtained when the phase θd is obtained by dq conversion and θdlag.

(Concrete Example 3-2)

[0599] FIG. 39B is a diagram for explaining a specific calculation example 3-2 applied to the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 39B θα can be easily analogized from the contents of specific Example 3-2 described below, and therefore the description thereof is omitted here.

[0600] One in FIG. 39B phase adjustment unit/function calculation unit F0 includes a Δθd calculation unit (phase change amount calculation unit) 13C', a first order Δθd delay calculation unit 13G', a Kd1 multiplication unit AE, a Kd multiplication unit AF, a subtraction unit AG and an addition unit AH, and performs the following calculation through.

[0601] The Δθd calculation unit 13C' receives the phase θd and calculates and outputs a change amount Δθd of the phase θd.

[0602] The first-order Δθd delay calculation unit 13G' receives the change amount Δθd of the phase θd output from the Δθd calculation unit 13C', calculates a first-order delay Δθdlag1 of the change amount Δθd using a function corresponding to the change amount Δθd by one first order lags and outputs the calculated value.

[0603] The Kdl multiplication unit AE multiplies the first-order delay Δθdlag1 of the change amount Δθd output from the first-order Δθd delay calculation unit 13G' by a coefficient Kd1 and outputs Kd1 · Δθdlag1.

[0604] The Kd multiplication unit AF multiplies the change amount Δθd output from the Δθd calculation unit 13C' by the coefficient Kd and outputs Kd · Δθd.

[0605] The subtraction unit AG subtracts the Kd · Δθd output from the Kd multiplication unit AF from the Kd1 · Δθdlag1 output from the Kd1 multiplication unit AE and outputs the difference between both (Kd1 · Δθdlag1- Kd · Δθd).

[0606] The addition unit AH adds the phase θd to (Kd1 · Δθdlag1 - Kd · Δθd) output from the subtraction unit AG, and outputs the result as the adjusted phase θdlag.

[0607] The appropriate values of Kd and Kd1 differ depending on the characteristics of a power system, a power conversion device, etc., but for simplicity, a case of Kd1 = Kd = 1 is described here as an example. For example, in a case where the system frequency decreases, the value of the change amount Δθd of the phase θd decreases. Since the value of Δθdlag1, which is a first-order delay of Δθd, decreases more slowly than the value of Δθd, Δθdlag1 > Δθd, and the value of (Δθdlag1 - Δθd) is positive (plus). Since θαlag is a value obtained by adding θα and (Δθαlag1 - Δθα), θdlag > θd.

[0608] In a case where the system frequency increases, the value of Δθd increases. Since the value of Δθdlag1, which is a first-order delay of Δθd, increases more slowly than the value of Δθd, Δθdlag1 < Δθd and the value of (Δθdlag1 - Δθd) is negative (minus). Since θdlag is a value obtained by adding θd and (Δθdlag1 - Δθd) (negative value), θdlag < θd.

[0609] In a case where the decrease or increase in the system frequency converges and the frequency becomes constant, the value of Δθdlag1 approaches the value of Δθd. In a case where a sufficiently long time elapses with respect to the first-order delay time constant after the frequency becomes constant, Δθdlag1 ≈ Δθd, i.e. H. (Δθdlag1 - Δθd) ≈ 0, and θdlag ≈ θd.

[0610] Although the case Kd = Kd1 = 1 has been described here, Kd1 and Kd can have values other than 1. When the coefficient of the coefficient multiplication unit is 1, the coefficient multiplication unit can be omitted. In addition, the coefficient multiplication unit can be provided in a subsequent stage of the subtraction unit AG.

[0611] According to the example of FIG. 39B, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in the system frequency by a combination of various calculation elements, including a function that tracks the change amount Δθd of the phase θd (or the change amount Δθα of the phase θα) by a first order, to that performed in the phase adjustment unit 11 Calculation processing is applied.

[0612] In the above example, an example in which the phase θd is obtained by dq conversion and θdlag is obtained has been described, but a similar effect can also be obtained when the phase θα is obtained by αβ conversion and θαlag.

Specific examples 4-1 and 4-2 for calculation in the phase adjustment unit 11

(Specific Example 4-1)

[0613] FIG. 40A is a diagram for explaining a specific calculation example 4-1 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 40A θd can be easily analogized from the contents of Specific Example 4-1 described below, and therefore the description thereof is omitted here.

[0614] One in FIG. 40A shown phase adjustment unit/function calculation unit F0 comprises a ωα calculation unit (angular velocity calculation unit) 13A', a first order ωα delay calculation unit 13E', a Kα1 multiplication unit AA, a first order ωαlag1 delay calculation unit AI, a Kα2 multiplication unit AJ, a subtraction unit AK, a Δt multiplication unit 13F' and an addition unit AD and performs the following calculation.

[0615] The ωα calculation unit 13A' receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0616] The first-order ωα deceleration calculation unit 13E' receives the angular velocity ωα output from the ωα calculation unit 13A', calculates a first-order deceleration ωαlag1 of the angular velocity ωα using a function that lags the angular velocity ωα by a first order, and outputs the calculated value.

[0617] The Kα1 multiplication unit AA multiplies the first-order delay ωαlag1 of the angular velocity ωα output from the first-order ωα calculation unit 13E' by a coefficient Kα1 to output Kα1 · ωαlag1.

[0618] The ωαlag1 first-order delay calculation unit AI for calculating the first-order delay ωαlag1 receives the first-order delay ωα of the angular velocity ωα output from the first-order delay ωα calculation unit 13E', calculates a second-order delay ωαlag2 of the angular velocity ωα Use a function that lags the first order delay ωαlag1 of the angular velocity ωα by a first order (i.e. a function that lags the angular velocity ωα by a second order) and outputs the calculated value.

[0619] The Kα2 multiplication unit AJ multiplies the second-order delay ωαlag2 of the angular velocity ωα output from the first-order ωαlag1 calculation unit AI by a coefficient Kα2 and outputs Kα2 · ωαlag2.

[0620] The subtraction unit AK subtracts the output Kα1 · ωαlag1 of the Kα1 multiplication unit AA from the output Kα2 · ωαlag2 of the Kα2 multiplication unit AJ and outputs the difference between the two (Kα2 · ωαlag2 - Kα1 · ωαlag1).

[0621] The Δt multiplication unit 13F' receives the output (Kα2 · ωαlag2 - Kα1 · ωαlag1) from the subtraction unit AK, multiplies (Kα2 · ωαlag2 - Kα1 · ωαlag1) by a step time Δt, converts the angular velocity into the phase change amount, and outputs (Kα2 · Δθαlag2 - Kα1 · Δθαlag1).

[0622] The addition unit AD adds (Kα2 · Δθαlag2 - Kα1 · Δθαlag1) output from the Δt multiplication unit 13F' and the phase θα, and outputs the result as an adjusted phase θαlag to the outside of the phase adjustment unit 11. Note that a dimensionless amount such as a pu value can be used for various variables and the Δt multiplication unit 13F' can be omitted.

[0623] The appropriate values of Kα2 and Kα1 are different depending on the characteristics of a network, a power conversion device, etc., but for simplicity, a case of Kα2 = Kα1 = 1 is described here.

[0624] For example, in a case where the system frequency decreases, the values of ωα, ωαlag1 and ωαlag2 decrease. The value of ωαlag1, which is a first-order delay of ωα, changes slower than the value of ωα. Furthermore, since the value of ωαlag2, which is a first-order delay of ωαlag1 (the second-order delay of ωα), decreases more slowly than ωαlag1, ωαlag2 > ωαlag1, the value of (ωαlag2 - ωαlag1) is positive (plus), and the Value (Δθαlag2 - Δωαlag1) obtained by multiplying (ωαlag2 - ωαlag1) by Δt is also positive (plus). Since θαlag is a value obtained by adding θα and (θαlag2 - θαlag1), θαlag > θα.

[0625] In a case where the system frequency increases, the values of ωα, ωαlag1 and ωαlag2 increase. The value of ωαlag1, which is a first-order delay of ωα, changes slower than the value of ωα. Furthermore, since the value of ωαlag2, which is a first-order delay of ωαlag1 (the second-order delay of ωα), increases more slowly than ωαlag1, ωαlag2 < ωαlag1, the value of (ωαlag2 - ωαlag1) is negative (minus), and the Value (Δθαlag2 - Δθαlag1) obtained by multiplying (ωαlag2 - ωαlag1) by Δt is also negative (minus). Since θαlag is a value obtained by adding θα and (θαlag2 - θαlag1) (negative value), θαlag < θα.

[0626] In a case where the decrease or increase in the system frequency converges and the frequency becomes constant, the values of ωαlag1 and ωαlag2 approach the value of ωα. In a case where a sufficiently long time elapses with respect to the first-order delay time constant after the frequency becomes constant, ωαlag1 ≈ ωαlag2 ≈ ωα, i.e. H. (ωαlag2 - ωαlag1) ≈ 0, and θαlag ≈ θα.

[0627] Although the case Kα2 = Kα1 = 1 has been described here, Kα2 and Kα1 can have values other than 1. If the coefficient of the coefficient multiplication unit is 1, the coefficient multiplication unit can be omitted. Furthermore, the coefficient multiplication unit may be provided in a subsequent stage of the subtraction unit AK or a subsequent stage of the Δt multiplication unit 13F'.

[0628] According to the example of FIG. 40A, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in system frequency by using a combination of various calculation elements, including a function that lags the angular velocity ωα of the phase θα by a first order and a function that further lags the first order delay by a first order. is applied to the calculation processing performed in the phase adjustment unit 11.

[0629] In the above example, an example in which the phase θα is obtained by αβ conversion and θαlag has been described, but a similar effect can also be obtained when the phase θd is obtained by dq conversion and θdlag.

(Specific Example 4-2)

[0630] FIG. 40B is a diagram for explaining a specific calculation example 4-2 applied to the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 40B θα can be easily analogized from the contents of Specific Example 4-2 described below, and therefore the description thereof is omitted here.

[0631] One in FIG. 40B includes a Δθd calculation unit (phase change amount calculation unit) 13C', a first order Δθd delay calculation unit 13G', a Kd1 multiplication unit AE, a first order Δθdlag1 delay calculation unit AL, a Kd2 multiplication unit AM, a subtraction unit ON and an addition unit AH and performs the following calculation.

[0632] The Δθd calculation unit 13C' receives the phase θd and calculates and outputs a change amount Δθd of the phase θd.

[0633] The first-order Δθd delay calculation unit 13G' receives the change amount Δθd output from the Δθd calculation unit 13C', calculates a first-order delay Δθdlag1 of the change amount Δθd using a function that lags the change amount Δθd by a first order, and outputs the calculated value.

[0634] The Kdl multiplication unit AE multiplies the first-order delay Δθdlag1 of the change amount Δθd output from the first-order Δθd delay calculation unit 13G' by a coefficient Kd1 and outputs Kd1 · Δθdlag1.

[0635] The first-order Δθdlag1 delay calculation unit AL receives the first-order delay Δθdlag1 of the change amount Δθd output from the first-order Δθd delay calculation unit 13G', calculates a second-order delay Δθdlag2 of the change amount Δθd using a function corresponding to the delay first order Δθdlag1 lags the amount of change Δθd by a first order (that is, a function that lags the amount of change Δθd by a second order), and outputs the calculated value.

[0636] The Kd2 multiplication unit AM multiplies the second-order delay Δθdlag2 of the change amount Δθd output from the first-order Δθdlag1 calculation unit AL by a coefficient Kd2 and outputs Kd2 · Δθdlag2.

[0637] The subtraction unit AN subtracts the Kd1 · Δθdlag1 output from the Kd1 multiplication unit AE from the Kd2 · Δθdlag2 output from the Kd2 multiplication unit AM and outputs a difference between the two numbers (Kd2 · Δθdlag2 - Kd1 · Δθdlag1).

[0638] The addition unit AH adds the phase θd to (Kd2 · Δθdlag2 - Kd1 · Δθdlag1) output from the subtraction unit AN, and outputs the result as the adjusted phase θdlag.

[0639] The appropriate values of Kd2 and Kd1 are different from each other depending on the characteristics of a power system, a power conversion device, etc., but for the sake of simplicity, a case of Kd2 = Kd1 = 1 is described here.

[0640] For example, in a case where the system frequency decreases, the values of Δθd, Δθdlag1 and Δθdlag2 decrease. The value of Δθdlag1, which is a first-order delay of Δθd, decreases more slowly than the value of Δθd. Furthermore, since the value of Δθdlag2, which is the first-order delay of Δθdlag1 (the second-order delay of Δθd), decreases at a slower rate than Δθdlag1, Δθdlag2 > Δθdlag1, and the value of (Δθdlag2 - Δθdlag1) is positive (plus) . Since θdlag is a value obtained by adding (Δθdlag2 - Δθdlag1) and θd, θdlag > θd.

[0641] In a case where the system frequency increases, the values of Δθd, Δθdlag1 and Δθdlag2 increase. The value of Δθdlag1, which is a first-order delay of Δθd, increases more slowly than the value of Δθd. Furthermore, since the value of Δθdlag2, which is a first-order delay of Δθdlag1 (the second-order delay of Δθd), increases at a slower rate than Δθdlag1, Δθdlag2 < Δθdlag1, and the value of (Δθdlag2 - Δθdlag1) is negative (minus) . Since θdlag is a value obtained by adding (Δθdlag2 - Δθdlag1) and θd, θdlag < θd.

[0642] In a case where the decrease or increase in the system frequency converges and the frequency becomes constant, the values of Δθdlag1 and Δθdlag2 approach the value of Δθd. In a case where a sufficiently long time elapses with respect to the first-order delay time constant after the frequency becomes constant, Δθdlag1 ≈ Δθdlag2 ≈ Δθd, i.e. H. (Δθdlag2 - Δθdlag1) ≈ 0, and θdlag ≈ θd.

[0643] Although the case Kd2 = Kd1 = 1 has been described here, Kd2 and Kd1 can have values other than 1. If the coefficient of the coefficient multiplication unit is 1, the coefficient multiplication unit can be omitted. In addition, the coefficient multiplication unit can be provided in a subsequent stage of the subtraction unit AN.

[0644] According to the example of FIG. 40B, waveforms W2 and W3 of FIG. 7B have desirable responsiveness to the change in system frequency by using a combination of various calculation elements, including a function that lags the amount of change Δθd of phase θd by a first order and a function that further lags the first order delay by a first order. is applied to the calculation processing performed in the phase adjustment unit 11.

[0645] In the above example, an example was described in which the phase θd is obtained by dq conversion and θdlag is obtained, but a similar effect can also be obtained when the phase θα is obtained by αβ conversion and θαlag is determined.

Specific examples 4-3 and 4-4 for calculation in the phase adjustment unit 11

(Specific Example 4-3)

[0646] FIG. 41A is a diagram for explaining a specific example 4-3 of calculation applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 41A θd can be easily analogized from the contents of Specific Example 4-3 described below, and therefore the description thereof is omitted here.

[0647] FIG. 41A shows a modification of FIG. 40A.

[0648] One in FIG. 41A shown phase adjustment unit/function calculation unit F0 comprises a ωα calculation unit (angular velocity calculation unit) 13A', a first order ωα delay calculation unit 13E', a Kα1 multiplication unit AA, a second order ωα delay calculation unit AO, a Kα2 multiplication unit AJ, a subtraction unit AK, a Δt multiplication unit 13F' and an addition unit AD and performs the following calculation.

[0649] The ωα calculation unit 13A' receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0650] The first-order ωα deceleration calculation unit 13E' receives the angular velocity ωα output from the ωα calculation unit 13A', calculates a first-order deceleration ωαlag1 of the angular velocity ωα using a function that lags the angular velocity ωα by a first order, and outputs the calculated value.

[0651] The Kα1 multiplication unit AA multiplies the first-order delay ωαlag1 of the angular velocity ωα output from the first-order ωα delay calculation unit 13E' by a coefficient Kα1 to output Kα1 · ωαlag1.

[0652] The second-order ωα deceleration calculation unit AO receives the angular velocity ωα output from the ωα calculation unit 13A', calculates a second-order deceleration ωαlag2 of the angular velocity ωα using a function that lags the angular velocity ωα by a second order, and outputs the calculated value.

[0653] The Kα2 multiplication unit AJ multiplies the second-order delay ωαlag2 of the angular velocity ωα output from the second-order ωα calculation unit AO by the coefficient Kα2 to output Kα2 · ωαlag2.

[0654] The subtraction unit AK subtracts the output Kα1 · ωαlag1 of the Kα1 multiplication unit AA from the output Kα2 · ωαlag2 of the Kα2 multiplication unit AJ and outputs the difference between the two (Kα2 · ωαlag2 - Kα1 · ωαlag1).

[0655] The Δt multiplication unit 13F' receives the output (Kα2 · ωαlag2 - Kα1 · ωαlag1) from the subtraction unit AK, multiplies (Kα2 · ωαlag2 - Kα1 · ωαlag1) by a step time Δt, converts the angular velocity into the phase change amount, and outputs (Kα2 · Δθαlag2 - Kα1 · Δθαlag1). Note that for various variables, a dimensionless amount such as a pu value may be used, and the Δt multiplication unit 13F' may be omitted.

[0656] The addition unit AD adds (Kα2 · Δθαlag2 - Kα1 · Δθlag1) output from the Δt multiplication unit 13F' to the phase θα, and outputs the result as an adjusted phase θαlag to the outside of the phase adjustment unit 11.

[0657] In a case when the coefficient of the coefficient multiplication unit is 1, the coefficient multiplication unit may be omitted. Furthermore, the coefficient multiplication unit may be provided in a subsequent stage of the subtraction unit AK or a subsequent stage of the Δt multiplication unit 13F'.

[0658] According to the example of FIG. 41A, waveforms W2 and W3 of FIG. 7B have a desirable response to the change in system frequency by a combination of various calculation elements, including a function that lags the angular velocity ωα of phase θα by a first order and a function that lags the angular velocity ωα of phase θα by a second order , to which calculation processing performed in the phase adjustment unit 11 is applied.

[0659] In the above example, an example was described in which the phase θα is obtained by αβ conversion and θαlag is obtained, but a similar effect can also be obtained when the phase θd is obtained by dq conversion and θdlag is determined.

(Specific Example 4-4)

[0660] FIG. 41B is a diagram for explaining a specific example 4-4 of calculation applied to the phase adjustment unit 11 in FIG. 34, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 41B θα can be easily analogized from the contents of Specific Example 4-4 described below, and therefore the description thereof is omitted here.

[0661] FIG. 41B shows a modification of FIG. 40B.

[0662] One in FIG. 41B phase adjustment unit/function calculation unit F0 includes a Δθd calculation unit 13C', a first order Δθd delay calculation unit 13G', a Kd1 multiplication unit AE, a second order Δθd delay calculation unit AP, a Kd2 multiplication unit AM, a subtraction unit AN and an addition unit AH and performs the following calculation.

[0663] The Δθd calculation unit 13C' receives the phase θd and calculates and outputs a change amount Δθd of the phase θd.

[0664] The first-order Δθd delay calculation unit 13G' receives the change amount Δθd output from the Δθd calculation unit 13C', calculates a first-order delay Δθdlag1 of the change amount Δθd using a function that lags the change amount Δθd by a first order, and outputs the calculated value.

[0665] The Kdl multiplication unit AE multiplies the first-order delay Δθdlag1 of the change amount Δθd output from the first-order Δθd delay calculation unit 13G' by a coefficient Kd1 and outputs Kd1 · Δθdlag1.

[0666] The Δθd calculation unit AP receives the change amount Δθd output from the Δθd calculation unit 13C', calculates a second-order delay Δθdlag2 of the change amount Δθd using a function that lags the change amount Δθd by a second order, and outputs the calculated value out of.

[0667] The Kd2 multiplication unit AM multiplies the second-order delay Δθd of the change amount Δθd output from the Δθd calculation unit AP by the coefficient Kd2, and outputs Kd2 · Δθdlag2.

[0668] The subtraction unit AN subtracts the Kd1 · Δθdlag1 output from the Kd1 multiplication unit AE from the Kd2 · Δθdlag2 output from the Kd2 multiplication unit AM, and outputs a difference between the two (Kd2 · Δθdlag2 - Kd1 · Δθdlag1).

[0669] The addition unit AH adds the phase θd to (Kd2 · Δθdlag2 - Kd1 · Δθdlag1) output from the subtraction unit AN, and outputs the result as the adjusted phase θdlag.

[0670] In a case when the coefficient of the coefficient multiplication unit is 1, the coefficient multiplication unit may be omitted. In addition, the coefficient multiplication unit can be provided in a subsequent stage of the subtraction unit AN.

41B, the waveforms W2 and W3 of FIG order, and a function that lags the change amount Δθd of the phase θd by a second order is applied to the calculation processing performed in the phase adjustment unit 11.

[0672] In the above example, an example was described in which the phase θd is obtained by dq conversion and θdlag is obtained, but a similar effect can also be obtained when the phase θα is obtained by αβ conversion and θαlag is obtained becomes.

Specific example 5 for the calculation in the phase adjustment unit 11

[0673] FIG. 42 is a diagram for explaining a specific calculation example 5 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable.

[0674] FIG. 42 shows an example of a case where PLL calculation is applied to a phase adjustment unit/function calculation unit F0.

[0675] The ones shown in FIG. 42, for example, generates an adjusted phase θαlag from an input phase θα after an αβ conversion using a PLL (phase-locked loop) calculation. The degree of adjustment of the adjusted phase θαlag can be adjusted by changing the coefficient used for calculating the adjusted phase θαlag and the value of the time constant.

[0676] The ones shown in FIG. 42 includes a subtraction unit CA, a Kp multiplication unit CB, an integration processing unit CC, an integration processing unit CD, an addition unit CE, and a constant Kf, and performs the following calculation.

[0677] The subtraction unit CA receives the phase θα, subtracts an output θαlag to be described later of the integration processing unit CD from the phase θα, and outputs ϕα (θα - θαlag) representing a phase difference between the two.

[0678] The Kp multiplication unit CB and the integration processing unit CC perform a proportional calculation of the phase difference ϕα output from the subtraction unit CA.

[0679] The Kp multiplication unit CB multiplies the phase difference ϕα output from the subtraction unit CA by a gain factor using a coefficient Kp and outputs Kp · ϕα. The value of Kp can be variable. In this case, the value of Kp can be adjusted according to a state change of the system (amplitude change, phase change and the like of various electrical quantities) or the like. Furthermore, a plurality of Kp multiplication units CB may be provided, and switching may be performed according to a change in the state of the system or the like.

[0680] The integration processing unit CC integrates the phase difference ϕα output from the subtraction unit CA and outputs the integrated value (for example, Σ (ϕα/Ti)). The value of Ti can be variable. In this case, the value of Ti can be adjusted according to a state change of the system (amplitude change, phase change and the like of various electrical quantities). In addition, a plurality of integration processing units CC may be provided, and the switching may be performed depending on a change in the state of the system or the like. The constant Kf is a constant determined from a nominal frequency or the like of the system. In a case where a dimensionless quantity such as a pu value for various coefficients in FIG. For example, if 42 is used, the constant is 1.

[0681] The addition unit CE receives the Kp · ϕd output from the Kp multiplication unit CB and the integral value (e.g. Σ (ϕα/Ti)) output from the integration processing unit CC, adds the constant Kf, and outputs the result. The addition unit CE, for example, outputs the value (1 + Kp · ϕα + Σ (ϕα/Ti)).

[0682] The integration processing unit CD integrates the output of the addition unit CE and outputs a value obtained by multiplying the output by a coefficient Kc as θαlag. The coefficient Kc is a constant determined from a conversion value from the pu value to a physical quantity, a calculation cycle, and the like. θαlag is output as adjusted phase θαlag to the outside of the phase adjustment unit 11 and input to the subtraction unit CA.

[0683] For the sake of simplicity, the operation of FIG. 42 in a case where Kf is equal to 1 and various variables are dimensionless quantities such as pu values.

[0684] Since θα increases with the speed of the angular velocity of the system frequency, in a case where the system frequency is constant, the increasing speed (angular velocity) of θα is also constant. For example, if the system frequency is the nominal frequency (1 pu), the slew rate (angular velocity) of θα is also 1 pu. Further, in a case where the sum of the output of the Kp multiplication unit CB and the output of the integration processing unit CC is 0 pu, the output of the addition unit CE (input of the integration processing unit CD) is 1 pu. Therefore, the slew rate (angular velocity) of the output (θαlag) of the integration processing unit CD is also 1 pu. This means that it is stabilized at θα = θαlag and ωα = ωαlag.

[0685] In a case where the system frequency decreases and the slew rate (angular velocity) of θα decreases, ϕα < 0 (θα - θαlag < 0), and the sum of the output of the Kp multiplication unit CB and the output of the integration processing unit CC is also less than 0. Accordingly, the output of the addition unit CE is less than 1 pu, the slew rate of the output of the integration processing unit CD is also less than 1 pu, and the slew rate (angular velocity) of θαlag decreases. The rate of increase (angular velocity) of θαlag continues to decrease until ϕα = 0. In a case where the decrease in system frequency (decrease in slew rate of θα) converges and θα = θαlag (ϕα = 0) after a certain time, the slew rate (angular velocity) of θα and the slew rate (angular velocity) of θαlag are also equal , and the calculation is stabilized. The time from the convergence of the decrease in the system frequency to the time θα = θαlag depends on the values of the proportionality coefficient Kp, the integral time constant Ti and the coefficient Kc. The behavior that θαlag - θα > 0 (ϕα = θα - θαlag < 0) while the system frequency decreases, the decrease in the system frequency converges and θα = θαlag is reached after a certain time corresponds to the behavior of the phase adjustment unit that is shown in the Embodiment described above is described.

[0686] In a case where the system frequency increases and the slew rate (angular velocity) of θα increases, ϕα > 0 (θα - θαlag > 0), and the sum of the output of the Kp multiplication unit CB and the output of the integration processing unit CC is also greater than 0. Accordingly, the output of the addition unit CE is greater than 1 pu, the slew rate of the output of the integration processing unit CD is also greater than 1 pu, and the slew rate (angular velocity) of θαlag increases. The slew rate (angular velocity) of θαlag continues to increase until ϕα = 0. In a case where the increase in system frequency (increase in slew rate of θα) converges and θα = θαlag (ϕα = 0) after a certain time, the are The slew rate (angular velocity) of θα and the slew rate (angular velocity) of θα were also the same, and the calculation is stabilized. The time from the convergence of the increase in the system frequency to the time θα = θαlag depends on the values of the proportionality coefficient Kp, the integral time constant Ti and the coefficient Kc. The behavior that θαlag - θα < 0 (ϕα = θα - θαlag > 0) while the system frequency increases, the increase in the system frequency converges and θα = θαlag is reached after a certain time corresponds to the behavior of the phase adjustment unit as shown in the embodiment described above is described.

[0687] As described above, the values of Kp and Ti can be variable. For example, in a case where the effect of the inertial reaction simulation is enhanced, the values of Kp and Ti can be adjusted so that the absolute value of (θαlag - θα) in which the phase θα changes is large. In a case where the effect of the inertial reaction simulation is reduced, the values of Kp and Ti can be adjusted so that the absolute value of (θαlag - θα) at which the phase θα changes is small.

[0688] That is, in order to increase the effect of the phase inertia simulation, the value of Kp can be reduced and the value of Ti can be increased compared to the case where the effect of the phase inertia simulation is reduced. In order to reduce the effect of the phase inertia simulation, the value of Kp may be increased and the value of Ti may be decreased compared to the case where the effect of the phase inertia simulation is increased.

[0689] According to the example of Fig. 42, the waveforms W2 and W3 of Fig. 7B can have a desirable response to the change in system frequency by a combination of calculation elements using the principle of phase-locked loop (PLL) calculation , to which calculation processing performed in the phase adjustment unit 11 is applied.

[0690] Note that in the above example, the example in which the phase adjustment unit/function calculation unit F0 receives the phase θα has been described. However, instead of θα, Vα (V cos (θα)) and Vβ (V sin (θα)) can also be received, and the values of Vd (cos (θα - θαlag)) and Vq (sin (θα - θαlag) ) can be determined from cos (θαlag) and sin (θαlag) to determine ϕα (θα - θαlag) from the obtained Vd and Vq.

Specific Examples 6-1 and 6-2 for calculation in the phase adjustment unit 11

(Concrete Example 6-1)

[0691] FIG. 43A is a diagram for explaining a specific calculation example 6-1 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 43A θα can be easily analogized from the contents of Specific Example 6-1 described below, and therefore the description thereof is omitted here.

[0692] One in FIG. 43A, phase adjustment unit/function calculation unit F0 includes a coefficient switching command output unit 16 on the outside or inside thereof, and includes a ωα calculation unit (angular velocity calculation unit) 13A', function processing units F3 and F4, a subtraction unit DA, a Δt multiplication unit 13F', an addition unit DB and switching units SW3, SW4, SW5 and SW6 and performs the following calculation.

[0693] The function processing units F3 and F4 have functions that can be used to calculate an angular velocity ωα. The switching unit SW3 selectively switches a time constant T11 or T12 that is used for the function of the function processing unit F3. The switching unit SW4 selectively switches a time constant T21 or T22 that is used for the function of the function processing unit F4. The switching unit SW5 selectively switches a coefficient Kα21 or Kα22, which is multiplied by the output of the function processing unit F4. The switching unit SW6 selectively switches a coefficient Kα11 or Kα12, which is to be multiplied by the output of the function processing unit F3.

[0694] The coefficient switching command output unit 16 issues a command to the switching units SW3, SW4, SW5 and SW6 for selectively switching coefficients used for various functions and calculations in accordance with a state change of the system (amplitude change, phase change and the like of various electrical quantities).

[0695] For example, the coefficient switching command output unit 16 measures the system voltage from the three-phase AC voltages Vu, Vv and Vw output from a transducer VT, and outputs a coefficient switching command when different quantities (at least one of the quantities such as amplitude, frequency and phase) of the system voltage decrease to predetermined values or less (or less than the predetermined values) or increase to predetermined values or more (or beyond the predetermined values). In a case where the coefficient switching command is issued, the coefficients to be used are switched from, for example, T11, T21, Kα11 and Kα21 to T12, T22, Kα12 and Kα22. When various quantities of the system voltage return to the predetermined values, the coefficient switching command is reset and the coefficients return from T12, T22, Kα12 and Kα22 to T11, T21, Kα11 and Kα21.

[0696] The ωα calculation unit 13A' receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0697] The function processing unit F3 receives the angular velocity ωα output from the ωα calculation unit 13A' and outputs a first-order delay ωαlag1n of the angular velocity ωα using a function that lags the angular velocity ωα by a first order.

[0698] One of the coefficients T11 and T12 selected by the switching unit SW3 is applied to the function of the function processing unit F3.

[0699] ωαlag1n output from the function processing unit F3 is multiplied by one of the coefficients Kα11 and Kα12 of the path selected by the switching unit SW6, and Kα11 · ωαlag1n or Kα12 · ωαlag1n (hereinafter collectively referred to as Kα1n · ωαlag1), which generated as a result are sent to the subtraction unit DA.

[0700] The function processing unit F4 receives the output ωαlag1n from the function processing unit F3 and outputs a second-order delay ωαlag2n of the angular velocity ωα using a function that lags ωαlag1n by another first-order delay.

[0701] One of the coefficients T21 and T22 selected by the switching unit SW4 is applied to the function of the function processing unit F4.

[0702] ωαlag2n output from the function processing unit F4 is multiplied by one of the coefficients Kα21 and Kα22 of the path selected by the switching unit SW5, and Kα21 · ωαlag2n or Kα22 · ωαlag2n (hereinafter collectively referred to as Kα2n · ωαlag2), which generated as a result are sent to the subtraction unit DA.

[0703] The subtraction unit DA subtracts Kα1n · ωαlag1 from Kα2n · ωαlag2 and outputs a difference between the two (Kα2n · ωαlag2 - Kα1n · ωαlag1).

[0704] The Δt multiplication unit 13F' receives the (Kα2n · ωαlag2 - Kα1n · ωαlag1) output from the subtraction unit DA, multiplies it by a step time Δt, converts the angular velocity into the phase change amount, and outputs (Kα2n · Δθαlag2 - Kα1n · Δθαlag1 ) out of. Note that a dimensionless amount can be used as a variable and that the multiplication unit Δt can be omitted.

[0705] The addition unit DB adds (Kα2n · Δθαlag2 - Kα1n · Δθαlag1) output from the Δt multiplication unit 13F' and the phase θα, and outputs the result as θαlag to the outside of the phase adjusting unit 11.

[0706] According to the example of FIG (amplitude change, frequency change, phase change and the like of various electrical quantities) are applied to the calculation processing performed in the phase adjustment unit 11.

[0707] In the above example, an example in which the phase θα is obtained by αβ conversion and θαlag has been described, but a similar effect can also be obtained when the phase θd is obtained by dq conversion and θdlag is obtained.

[0708] In the above example, an example in which two first-order delay functions are applied to the calculation of the angular velocity ωα has been described, but a first-order delay function can also be used. In addition, a calculation other than the first-order delay function (a PLL calculation, a second-order delay function, etc.) can also be used.

(Specific Example 6-2)

[0709] FIG. 43B is a diagram for explaining a specific calculation example 6-2 applied to the phase adjustment unit 11 in FIG. 33, the phase adjustment unit 21, 32, 41 to 43 or 52 of the second to thirteenth embodiments described above, or the function calculation unit F1, F2 or F20 of FIG. 18F, 20F or 22B is applicable. Note that a specific example of the calculation applicable in a case where the input in FIG. 43B θα can be easily analogized from the contents of Specific Example 6-2 described below, and therefore the description thereof is omitted here.

[0710] One in FIG. 43B includes a function switching command output unit 17 on its outside or inside and includes a ωα calculation unit (angular velocity calculation unit) 13A', function processing units F31 and F32, function processing units F41 and F42, a subtraction unit DC, a Δt multiplication unit 13F', an addition unit DD and switching units SW7 and SW8 and performs the following calculation.

[0711] The function processing units F31, F32, F41 and F42 have functions that can be used to calculate an angular velocity ωα. The switching unit SW7 selectively switches the function and a coefficient Kα21 of the function processing unit F41 or the function and a coefficient Kα22 of the function processing unit F42 used for the calculation. The switching unit SW8 selectively switches a coefficient Kα11 or Kα12, which is multiplied by the output of the function processing unit F31 or F32.

[0712] The function switching command output unit 17 issues a command to the switching units SW7 and SW8 for selectively switching various functions or for selectively switching coefficients used for various functions or calculations in accordance with a state change of the system (amplitude change, phase change and the like of various electrical quantities). .

[0713] For example, the function switching command output unit 17 measures the system voltage from the three-phase AC voltages Vu, Vv and Vw output from a transducer VT, and outputs a function switching command when different quantities (at least one of the quantities such as amplitude, frequency and phase) of the system voltage decrease to predetermined values or less (or less than the predetermined values) or increase to predetermined values or more (or beyond the predetermined values). In a case when the function switching command is issued, the path of the function and the coefficient to be used are switched. For example, the path of the function of the function processing unit F31, the function of the function processing unit F41, the coefficient Kα21 and the coefficient Kα11 is switched to the path of the function of the function processing unit F32, the function of the function processing unit F42, the coefficient Kα22 and the coefficient Kα12. In a case when various quantities of the system voltage return to predetermined values, the function switching command is reset and the original state is restored.

[0714] The ωα calculation unit 13A' receives a phase θα, calculates an angular velocity ωα of the phase θα, and outputs the angular velocity ωα.

[0715] The function processing units F31 and F32 receive the angular velocity ωα output from the ωα calculation unit 13A' and output first-order delays ωαlag11 and ωαlag12 of the angular velocity ωα, respectively, using a function that lags the angular velocity ωα by a first order.

[0716] The value ωαlag11 or ωαlag12 output by the function processing unit F31 or F32 is multiplied by one of the coefficients Kα11 and Kα12 selected by the switching unit SW8, and the value Kα11 · ωalag1n or Kα12 · ωαlag1n (hereinafter collectively referred to as Kα1n · ωαlag1n) is sent to the subtraction unit DC.

[0717] The function processing units F41 and F42 receive the ωαlag11 and ωαlag12 output from the function processing units F31 and F32 and output the second-order delays ωαlag21 and ωαlag22 of the angular velocity ωα by using a function that lags it by another first order.

[0718] ωαlag21 and ωαlag22 output from the function processing units F41 and F42 are multiplied by the coefficients Kα21 and Kα22, and as a result, Kα21 · ωαlag21 and Kα22 · ωαlag22 are generated, and the signal selected by SW7 (hereinafter collectively referred to as Kα2n · ωαlag2n) is sent to the subtraction unit DC.

[0719] The subtraction unit DC subtracts Kα1n · ωαlag1n from Kα2n · ωαlag2n and outputs a difference between the two (Kα2n · ωαlag2n - Kα1n · ωαlag1n).

[0720] The Δt multiplication unit 13F' receives the (Kα2n · ωαlag2n - Kα1n · ωαlag1n) output from the subtraction unit DC, multiplies it by a step time Δt, converts the angular velocity into the phase change amount, and outputs (Kα2n · Δθαlag2n - Kα1n · Δθαlag1n ) out of.

[0721] Note that a dimensionless amount can be used as a variable and that the multiplication unit Δt can be omitted.

[0722] The addition unit DD adds (Kα2n · Δθαlag2n - Kα1n · Δθαlag1n) output from the Δt multiplication unit 13F' and the phase θα, and outputs the result as θαlag to the outside of the phase adjusting unit 11.

[0723] According to the example of FIG. 43B, waveforms W2 and W3 of FIG. 7B have a desirable responsiveness to the change in the system frequency by processing the selective switching of various functions according to the state change of the system (amplitude change, frequency change, phase change and the like of various electrical quantities) or the selective switching of various functions or coefficients used for the calculation are applied to the calculation processing performed in the phase adjustment unit 11.

[0724] In the above example, an example in which the phase θα is obtained by αβ conversion and θαlag has been described, but a similar effect can also be obtained when the phase θd is obtained by dq conversion and θdlag.

[0725] In the above example, an example in which two first-order delay functions are applied to a calculation path of the angular velocity ωα has been described, but a first-order delay function can also be used.

[0726] Furthermore, a calculation other than the first-order delay function (a PLL calculation, a second-order delay function, etc.) may also be used.

Specific Examples 7-1 and 7-2 for calculation in the phase adjustment unit 11

(Specific Example 7-1)

[0727] FIG. 44A is a diagram for explaining a specific calculation example 7-1 used for the phase adjustment unit 11 in FIG. 33 applies.

[0728] FIG. 44A shows a modification of FIG. 40A.

[0729] A phase adjustment unit/function calculation unit F0 in FIG. 44A includes an nth power calculation unit AQ in addition to the various elements in FIG. 40A. It should be noted that here the description of parts similar to those in FIG. 40A is omitted and various parts are mainly described.

[0730] The nth power calculation unit AQ determines the nth power of the output of the subtraction unit AK and outputs positive and negative signs corresponding to the output of the subtraction unit AK. The Δt multiplication unit 13F' multiplies the output of the nth power calculation unit AQ by a step time Δt to convert the angular velocity into the phase change amount, and outputs the phase change amount. The addition unit AD adds the Δt multiplication unit 13F' and θα and outputs the result outside the phase adjustment unit 11 as the adjusted phase θαlag.

[0731] For example, in a case where n > 1, the change in the output of the nth power calculation unit AQ is larger than the change in the output of the subtraction unit AK. Therefore, by choosing an appropriate value for n, the effect of phase adjustment can be increased compared to a case where there is no nth power calculation unit AQ.

[0732] In other words, for example, in a case where the system frequency decreases, the speed of the phase difference represented by the waveform W2 in FIG. 7B(b) is displayed. Accordingly, the active power shown by waveform W3 in FIG. 7B(c) increases sharply, and the effect of suppressing the drop in system frequency increases. Furthermore, in a case where the drop in the system frequency is suppressed and the system frequency is stabilized, the phase difference represented by the waveform W2 in FIG. 7B(b) decreases sharply and quickly returns to the original value (value before the system frequency decreases). Accordingly, the active power represented by the waveform W3 in FIG. 7B(c) also decreases sharply and quickly returns to the original value (value before the system frequency decreases).

[0733] According to the example of FIG. 44A, waveforms W2 and W3 of FIG. 7B can be improved to show a more desirable response to the change of the system frequency by applying the processing of the output of the result of the nth power (power) calculation to the calculation processing performed in the phase adjustment unit 11.

(Specific Example 7-2)

[0734] FIG. 44B is a diagram for explaining a specific calculation example 7-2 applied to the phase adjustment unit 11 in FIG. 34 is applicable.

[0735] FIG. 44B shows a modification of FIG. 40B.

[0736] A phase adjustment unit/function calculation unit F0 in FIG. 44B includes an nth power calculation unit AR in addition to the various elements in FIG. 40B. It should be noted that here the description of parts similar to those in FIG. 40B will be omitted and different parts will be mainly described.

[0737] The nth power calculation unit AR obtains the nth power of the output of the subtraction unit AN and outputs positive and negative signs corresponding to the output of the subtraction unit AN. The addition unit AH adds the output of the nth power calculation unit AR and θd and outputs the result as an adjusted phase θdlag to the outside of the phase adjustment unit 11.

[0738] For example, in a case where n > 1, the change in the output of the nth power calculation unit AR is larger than the change in the output of the subtraction unit AN. Therefore, by choosing an appropriate value of n, the effect of phase adjustment can be increased compared to a case where there is no nth power calculation unit AR.

[0739] According to the example of FIG. 44B, waveforms W2 and W3 of FIG. 7B can be improved to show a more desirable response to the change of the system frequency by applying the processing of the output of the result of calculation of the nth power (power) of the adjusted phase θdlag to the calculation processing performed in the phase adjusting unit 11. Specific calculation example for the inertia simulation control signal generating unit 15

[0740] FIG. 45A and 45B are diagrams for explaining a specific calculation example applied to the inertia simulation control signal generating unit 15 in FIG. 28, 30 and 32 is applicable. FIG. 45A is an example of a case where the final output (θαlag, θdlag and the like) of the phase adjustment unit 11 is input to the inertia simulation control signal generating unit 15. 45B is an example of a case where a signal generated in the calculation process of the phase adjustment unit 11 is output and input to the inertia simulation control signal generating unit 15.

[0741] The inertia simulation control signal generating unit 15 in FIG. 45A includes a subtraction calculation unit and a conversion function. The subtraction calculation unit subtracts the value of the output signal of the phase calculation unit 2b from the value of the output signal of the phase adjustment unit 11 to obtain φα, φd and the like. The conversion function is a function for converting φα, φd and the like into signals suitable for the power control device 2. For example, angles such as ϕα and ϕd are converted into sin values, pu values and the like, multiplied by coefficients if necessary, and converted into signals suitable for the power control device 2.

[0742] The inertia simulation control signal generating unit 15 in FIG. 45B contains a conversion function. The conversion function is a function for converting φα, φd and the like into signals suitable for the power control device 2. For example, angles such as ϕα and ϕd are converted into sin values, pu values and the like, multiplied by the required coefficients, and converted into signals suitable for the power control device 2.

[0743] For example, in a case where a during calculation of the phase adjustment unit/function calculation unit F0 in FIG. 42 generated signal is used, the output ϕα of the subtraction unit CA is input into the inertia simulation control signal generation unit 15. For example, in a case where a during the calculation of the phase adjustment unit/function calculation unit F0 in FIGS. 36A, 37A and 38A, the output (signal before addition of θα) of the Δt multiplication unit 13F of the phase adjustment unit/function calculation unit F0 is input to the inertia simulation control signal generation unit 15. Instead of inputting the output of the Δt multiplication unit 13F into the inertia simulation control signal generation unit 15, the output of the first order delay calculation unit 13E, the second order delay calculation unit 13H, or the first and second order delay calculation units 13J may be input to the inertia simulation control signal generation unit 15, and the inertia simulation control signal generation unit 15 can generate the inertia simulation control signal using an appropriate coefficient and conversion function.

[0744] In a case where a during the calculation of the phase adjustment unit/function calculation unit F0 in FIGS. 36B, 37B and 38B is used, the signal before adding θd (output of the first order delay calculation unit 13E, the second order delay calculation unit 13H or the first and second order delay calculation units 13J) of the phase adjustment unit/function calculation unit F0 into the inertia simulation control signal -Generation unit 15 can be entered.

[0745] In a case where a during the calculation of the phase adjustment unit/function calculation unit F0 in FIGS. 39A, 40A and 41A, the output of the Δt multiplication unit 13F' (the signal before addition of θα in the phase adjustment unit 11) may be input to the inertia simulation control signal generation unit 15. Instead of inputting the output of the Δt multiplication unit 13F' into the inertia simulation control signal generation unit 15, the output of the subtraction unit AC or the subtraction unit AK may be input into the inertia simulation control signal generation unit 15, and the inertia simulation control signal generation unit 15 can do so Generate inertial simulation control signal using an appropriate coefficient and conversion function.

[0746] In a case where a during calculation of the phase adjustment unit/function calculation unit F0 in FIG. 39B, 40B and 41B is used, the signal may be input to the inertia simulation control signal generating unit 15 before adding θd in the phase adjustment unit/function calculation unit F0. In the case of FIG. 39B, the output signal (Kd1 x Δθdlag1 - Kd x Δθd) of the subtraction unit AG can be input to the inertia simulation control signal generating unit 15, and in the cases of FIG. 40B and 41B, the output signal (Kd2 x Δθdlag2 - Kd1 x Δθdlag1) of the subtraction unit AN can be input to the inertia simulation control signal generating unit 15.

[0747] As described in detail above, in each embodiment, it is possible to change the output and/or the input of the charger/discharger according to the transient frequency fluctuation and the voltage phase change of the system and to suppress the frequency fluctuation of the system.

[0748] Although certain embodiments have been described, these embodiments have been presented by way of example only and are not intended to limit the scope of the inventions. In fact, the new embodiments described herein may be embodied in a variety of other forms; Additionally, various omissions, substitutions, and changes may be made in the form of the embodiments described herein. The appended claims and their equivalents are intended to cover such forms or modifications as would come within the scope of the inventions.

Claims (13)

1. Power control device (2) that controls a power converter (1) connected to an AC circuit, the power control device (2) comprising: an electrical quantity measuring unit (2a) configured to measure an electrical quantity of the electrical circuit; a command value calculation unit (2c) configured to obtain a control command value for the power converter (1) based on the electrical quantity measured by the electrical quantity measuring unit (2a); a phase calculation unit (2b) configured to determine a phase of the electrical quantity measured by the electrical quantity measuring unit (2a); a phase adjustment unit (11) configured to adjust a phase of the electrical quantity determined by the phase calculation unit (2b); and a control signal generating unit (15) configured to generate a control signal using a signal indicating a difference between the time before and after the adjustment of the phase adjusted by the phase adjusting unit (11), wherein a signal generated by the control signal generation unit (15) for controlling an active power command value to be given to the power control device (2), for controlling a voltage command value to be given to the command value calculation unit (2c) or for controlling a voltage command value to be given to the command value -Calculation unit (2c) is used to give the current command value. 2. Power control device (2) that controls a power converter (1) of a rotating machine connected to an AC electrical circuit, the power control device (2) comprising: an electrical quantity measuring unit (2a) configured to measure an electrical quantity of the electrical circuit; a command value calculation unit (2c) configured to obtain a control command value for the power converter (1) based on the electrical quantity measured by the electrical quantity measuring unit (2a); a phase calculation unit (2b) configured to determine a phase of the electrical quantity measured by the electrical quantity measuring unit (2a); a phase adjustment unit (11) configured to adjust a phase of the electrical quantity obtained from the phase calculation unit (2b); and a control signal generating unit (15) configured to generate a control signal using a signal indicating a difference between the time before and after the adjustment of the phase adjusted by the phase adjusting unit (11), wherein a signal generated by the control signal generation unit (15) for controlling an active power command value to be given to the power control device (2), for controlling a voltage command value to be given to the command value calculation unit (2c) or for controlling a voltage command value to be given to the command value -Calculation unit (2c) is used to give the current command value. 3. Power control device (2) according to claim 1 or 2, wherein the phase adjustment unit (11) includes a variety of functions that make it possible to change the degree of adjustment of the phase, and a designated function among the functions is used to adjust the phase in response to a command to switch the function. 4. Power control device (2) according to claim 1 or 2, wherein the phase adjustment unit (11) includes a function making it possible to change a degree of adjustment of the phase depending on a value of a coefficient, and uses a value of a particular coefficient to adjust the phase in response to a command to change the coefficient. 5. Power control device (2) according to claim 1 or 2, further comprising: a switching unit (SW1a to SW5b) configured to switch between a first path in which a signal indicative of an electrical quantity of the circuit passes through the phase adjustment unit (11) and a second path in which the Signal bypasses the phase adjustment unit (11) without passing through the phase adjustment unit (11), enables where the switching unit (SW1a to SW5b) releases a particular path of the first path and the second path in response to a path switching command. 6. Power conversion device comprising: the power control device (2) according to claim 1 or 2; an electrical quantity change calculation unit (94) configured to determine a change amount or a change rate of an electrical quantity of the electrical circuit obtained by measuring the electrical quantity; a comparison unit (95) configured to output information indicating whether the amount of change or the rate of change of the electrical quantity determined by the electrical quantity change calculation unit (94) is equal to or greater than a predetermined reference value or exceeds this, or whether it is equal to or smaller than or falls below the predetermined reference value; and a command unit (96-1, 96-2 or 96-3) configured to change a degree of adjustment of the phase according to the information output from the comparison unit (95). 7. Power conversion device comprising: the power control device (2) according to claim 1 or 2; a comparison unit (102) configured to output information indicating whether a value of an electrical quantity of the electrical circuit obtained by measuring the electrical quantity is equal to or greater than or greater than a predetermined reference value, or whether it is equal to or smaller than the predetermined reference value; and a command unit (103-1, 103-2 or 103-3) configured to change the degree of adjustment of the phase according to the information output from the comparison unit (102). 8. Power conversion device comprising: the power control device (2) according to claim 1 or 2; a determination unit (102) configured to output information indicating whether a value of a first electrical quantity of the electrical circuit obtained by measuring the first electrical quantity or a change amount or a change rate of the value of the first electrical quantity is equal to or greater than a predetermined reference value, or exceeds it, or not, or is equal to or less than the predetermined reference value, or falls below it, and a value of a second electrical quantity of the electrical circuit, which is determined by measuring the second electrical quantity is obtained, or an amount of change or a rate of change of the value of the second electrical quantity is equal to or greater than, or exceeds, a predetermined reference value, or is equal to or less than, or falls below, the predetermined reference value; and a command unit (103-1, 103-2 or 103-3) configured to change a degree of adjustment of the phase according to the information output from the determination unit (102). 9. Power control device (2) according to claim 1 or 2, wherein the phase calculation unit (2b) performs an αβ conversion or a dq conversion, and the phase adjustment unit (11) generates an adjusted phase, which is obtained by adjusting a phase after αβ conversion or after dq conversion of the electrical quantity. 10. Power control device (2) according to claim 9, wherein the phase adjustment unit (11) generates the adjusted phase by performing a calculation using an angular velocity or a change amount of the phase after αβ conversion or after dq conversion of the electrical quantity. 11. Power control device (2) according to claim 9, wherein the phase adjustment unit (11) generates the adjusted phase by performing a calculation using a first-order delay and/or a second-order delay of an angular velocity or a change amount of the phase after αβ conversion or after dq conversion of the electrical quantity. 12. Power control device (2) according to claim 9, wherein the phase adjustment unit (11) the adjusted phase is generated from the electrical quantity using a PLL calculation and the adjusted phase can be adjusted by changing the values of a time constant and a coefficient used for the PPL calculation. 13. Power control device (2) according to claim 9, wherein the phase adjustment unit (11) contains a plurality of functions or coefficients that can be used to calculate the adjusted phase, and the power control device (2) further comprises a switching command unit (SW3 to SW6) configured to selectively select a function or a coefficient to be used for calculating the adjusted phase among the functions or coefficients in accordance switches with the electrical size.