WO2023233454A1 - 電力変換装置、および制御装置 - Google Patents

電力変換装置、および制御装置 Download PDF

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Publication number
WO2023233454A1
WO2023233454A1 PCT/JP2022/021899 JP2022021899W WO2023233454A1 WO 2023233454 A1 WO2023233454 A1 WO 2023233454A1 JP 2022021899 W JP2022021899 W JP 2022021899W WO 2023233454 A1 WO2023233454 A1 WO 2023233454A1
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Prior art keywords
power
voltage
constant
power converter
phase
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Ceased
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PCT/JP2022/021899
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English (en)
French (fr)
Japanese (ja)
Inventor
幸太 ▲浜▼中
涼介 宇田
香帆 椋木
俊行 藤井
孝途 東井
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to EP22944744.6A priority Critical patent/EP4535591A4/en
Priority to US18/868,572 priority patent/US20250357761A1/en
Priority to PCT/JP2022/021899 priority patent/WO2023233454A1/ja
Priority to JP2022550807A priority patent/JP7183486B1/ja
Publication of WO2023233454A1 publication Critical patent/WO2023233454A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in networks by storage of energy
    • H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2103/00—Details of circuit arrangements for mains or AC distribution networks
    • H02J2103/30—Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks

Definitions

  • the present disclosure relates to a power conversion device and a control device.
  • a power converter equipped with virtual synchronous machine control is controlled to simulate the behavior when a synchronous generator to be simulated is connected to the power system.
  • the control device according to Japanese Patent Application Publication No. 2019-176584 (Patent Document 1) calculates a virtual inertia value based on the specifications and operating status of the distributed power source, and combines the calculated virtual inertia value with the request from the system operator.
  • a virtual inertia is set in the power conversion device based on either one of the required inertia value and the required inertia value.
  • a voltage-controlled power converter equipped with virtual synchronous machine control operates as a voltage source that can output an AC voltage having a voltage phase and voltage amplitude different from the grid voltage.
  • a phase difference occurs between the AC voltage of the power converter and the grid voltage, the AC voltage decreases, and the effective power of the power converter decreases.
  • Power input/output occurs.
  • the capacity of the power source for example, a storage battery, etc.
  • the DC voltage of the power converter will fluctuate. There was a problem that an overvoltage occurred, and as a result, the power converter stopped protecting itself.
  • An object of an aspect of the present disclosure is to provide a power converter and a control device that can stably continue operation in a power converter that performs control simulating a synchronous generator.
  • a power conversion device includes a power storage element, a power converter that performs power conversion between the power storage element and the power grid, and a control device that operates the power converter as a voltage source.
  • the power converter converts the DC power output from the power storage element into AC power, and outputs the AC power to the power grid.
  • the control device includes a generator simulator that generates an angular frequency deviation by simulating the characteristics of the synchronous generator based on the active power command value and the active power of the power system, and a generator simulator that generates an angular frequency deviation based on the AC voltage of the power system.
  • the constant setting unit sets at least one of an inertia constant and a damping constant of the synchronous generator; a phase generation section that generates a reference phase of the output voltage of the power converter based on the angular frequency deviation and the reference angular frequency;
  • the power converter includes a signal generator that generates a control signal for the power converter based on the reference phase and a reference voltage command value of the output voltage of the power converter.
  • a control device operates a power converter that performs power conversion between a power storage element and a power grid as a voltage source.
  • the power converter converts the DC power output from the power storage element into AC power, and outputs the AC power to the power grid.
  • the control device includes a generator simulator that generates an angular frequency deviation by simulating the characteristics of the synchronous generator based on the active power command value and the active power of the power system, and a generator simulator that generates an angular frequency deviation based on the AC voltage of the power system.
  • the constant setting unit sets at least one of an inertia constant and a damping constant of the synchronous generator; a phase generation section that generates a reference phase of the output voltage of the power converter based on the angular frequency deviation and the reference angular frequency;
  • the power converter includes a signal generating section that generates a control signal for the power converter based on the reference phase and a reference voltage command value of the output voltage of the power converter.
  • a power converter that performs control simulating a synchronous generator can continue to operate stably.
  • FIG. 1 is a diagram for explaining an example of the overall configuration of a power conversion system.
  • 2 is a diagram showing an example of the configuration of a power converter 20.
  • FIG. 3 is a diagram showing another example of the configuration of power converter 20.
  • FIG. 1 is a diagram showing an example of a hardware configuration of a control device 100.
  • FIG. FIG. 3 is a block diagram showing an example of a functional configuration of a command generation section.
  • FIG. 2 is a block diagram showing an example of the configuration of a constant setting section.
  • FIG. 1 is a diagram for explaining an example of the overall configuration of a power conversion system.
  • Power conversion system 1000 includes a power system 2 , a transformer 3 , an alternating current detector 6 , an alternating current voltage detector 7 , a direct current voltage detector 9 , and a power converter 200 .
  • Power conversion device 200 includes control device 100, power converter 20, and power storage element 40.
  • Power converter 20 is connected to interconnection point 4 of power system 2 via transformer 3 .
  • the power system 2 is a three-phase AC power source.
  • the power converter 20 is a power converter that is connected to the power storage element 40 and performs power conversion between the power storage element 40 and the power system 2. Specifically, power converter 20 converts the DC power output from power storage element 40 into AC power, and outputs the AC power to power system 2 via transformer 3 . Furthermore, power converter 20 converts AC power from power system 2 into DC power, and outputs the DC power to power storage element 40 . Thereby, power converter 20 charges and discharges the power of power storage element 40 .
  • the power converter 20 is controlled by the control device 100 as a voltage source capable of outputting an AC voltage having a voltage phase and voltage amplitude different from the grid voltage.
  • FIG. 2 is a diagram showing an example of the configuration of the power converter 20.
  • power storage element 40 includes capacitors 41 and 42 connected in series.
  • Energy storage element 40 corresponds to one embodiment of a DC power source.
  • the power storage element 40 is formed of an electric double layer capacitor, and has a capacity larger than that of a power storage element formed of a general capacitor and smaller than a capacity of a power storage element formed of a secondary battery.
  • power converter 20 is configured such that continuous output of rated power completes discharging of power storage element 40 in several seconds (for example, about 3 seconds).
  • the power converter 20 includes inverters 21u, 21v, and 21w as three-level converters.
  • Each of the inverters 21u, 21v, and 21w has a known configuration including four switching elements configured with triacs, and converts the DC voltage of the capacitor connected in parallel to the power storage element 40 into the PWM ( It is converted into a sinusoidal AC voltage using Pulse Width Modulation control.
  • An inverter 21u is connected to the U-phase secondary winding of the transformer 3
  • an inverter 21v is connected to the V-phase secondary winding
  • an inverter 21w is connected to the W-phase secondary winding.
  • control signals Sgu, Sgv, and Sgw shown in FIG. 2 and input to the inverters 21u, 21v, and 21w, respectively, are the on/off control signals ( 4 pieces) is comprehensively shown.
  • the inverters 21u, 21v, and 21w output sinusoidal AC voltages having phases different by 120 degrees to the three-phase power transmission line. Thereby, the power converter 20 operates as a three-phase, three-level converter.
  • FIG. 3 is a diagram showing another example of the configuration of the power converter 20.
  • Power converter 20 shown in FIG. 3 further includes inverters 21x, 21y, and 21z in addition to inverters 21u, 21v, and 21w shown in FIG.
  • the secondary winding of the transformer 3 is composed of an open winding.
  • Inverters 21u and 21x are connected to the positive and negative sides of the U-phase secondary winding of transformer 3, respectively.
  • Inverters 21v and 21y are connected to the positive and negative sides of the V-phase secondary winding, respectively.
  • Inverters 21w and 21z are connected to the positive and negative sides of the W-phase secondary winding, respectively.
  • control signals Sgu, Sgv, Sgw, Sgx, Sgy, and Sgz input to each of the inverters 21u, 21v, 21w, 21x, 21y, and 21z shown in FIG. It comprehensively shows on/off control signals for four switching elements in the inverter.
  • the power converter 20 can be configured by a self-excited converter such as a two-level converter or a modular multi-level converter as long as it has a DC/AC power conversion function.
  • alternating current detector 6 detects three-phase alternating current at interconnection point 4 between power system 2 and power converter 20. Specifically, the alternating current detector 6 detects the U-phase alternating current Isysu, the V-phase alternating current Isysv, and the W-phase alternating current Isysw flowing between the transformer 3 and the connection point 4. Alternating currents Isysu, Isysv, and Isysw (hereinafter also collectively referred to as “alternating current Isys”) are input to the control device 100.
  • the AC voltage detector 7 detects the three-phase AC voltage at the interconnection point 4 of the power system 2. Specifically, the AC voltage detector 7 detects the U-phase AC voltage Vsysu, the V-phase AC voltage Vsysv, and the W-phase AC voltage Vsysw at the connection point 4. AC voltages Vsysu, Vsysv, and Vsysw (hereinafter also collectively referred to as “AC voltage Vsys”) are input to the control device 100.
  • the DC voltage detector 9 detects the DC voltage Vdc output from the power storage element 40.
  • DC voltage Vdc is input to control device 100. Note that the DC voltage Vdc can also be said to be the DC voltage output from the power converter 20.
  • the control device 100 is a device that operates the power converter 20 as a voltage source.
  • the control device 100 includes a command generation section 101 and a signal generation section 103 as main functional components.
  • Each function of command generation section 101 and signal generation section 103 is realized by a processing circuit.
  • the processing circuit may be dedicated hardware or may be a CPU (Central Processing Unit) that executes a program stored in the internal memory of the control device 100.
  • the processing circuit is dedicated hardware, the processing circuit is configured of, for example, an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or a combination thereof.
  • the command generation unit 101 mainly has a function of simulating the characteristics of a synchronous generator, and has the function of simulating the characteristics of a synchronous generator, and is configured to set the reference phase ⁇ of the voltage output from the power converter 20 and the voltage command value of the voltage (i.e., voltage amplitude Command values) Vdref and Vqref are generated.
  • the reference phase ⁇ is a reference phase used to control the power converter 20.
  • Vdref is a d-axis voltage command value in a two-axis (ie, d-axis and q-axis) rotating coordinate system
  • Vqref is a q-axis voltage command value. Details of the command generation unit 101 will be described later. In this embodiment, it is assumed that the d-axis voltage in the rotating coordinate system corresponds to a reactive voltage component, and the q-axis voltage corresponds to an active voltage component. The same applies to current.
  • the signal generation unit 103 generates electric power based on the reference phase ⁇ , the d-axis voltage command value Vdref, and the q-axis voltage command value Vqref (hereinafter also collectively referred to as “voltage command value Vref”) generated by the command generation unit 101.
  • a control signal for the converter 20 is generated and output to the power converter 20.
  • signal generation section 103 includes a three-phase voltage generation section 105 and a PWM control section 107.
  • the three-phase voltage generation unit 105 generates three-phase sine wave voltages Vu*, Vv*, Vw by two-phase/three-phase conversion based on the reference phase ⁇ , the d-axis voltage command value Vdref, and the q-axis voltage command value Vqref. Generate *.
  • the PWM control unit 107 performs pulse width modulation on each of the three-phase sinusoidal voltages Vu*, Vv*, and Vw* to generate a control signal as a PWM signal. For example, control signals Sgu, Sgv, and Sgw for each of the four switching elements of inverters 21u, 21v, and 21w shown in FIG. 2 are generated. PWM control section 107 outputs the control signal to power converter 20. Typically, the control signal is a gate control signal for controlling on and off of each switching element included in power converter 20.
  • FIG. 4 is a diagram showing an example of the hardware configuration of the control device 100.
  • FIG. 4 shows an example in which the control device 100 is configured by a computer.
  • control device 100 includes one or more input converters 70, one or more sample and hold (S/H) circuits 71, multiplexer 72, A/D converter 73, It includes at least one CPU 74 , a RAM (Random Access Memory) 75 , a ROM (Read Only Memory) 76 , one or more input/output interfaces 77 , and an auxiliary storage device 78 .
  • Control device 100 also includes a bus 79 that interconnects the components.
  • the input converter 70 has an auxiliary transformer for each input channel.
  • Each auxiliary transformer converts the detection signal from each detector of FIG. 1 into a signal at a voltage level suitable for subsequent signal processing.
  • the S/H circuit 71 is provided for each input converter 70.
  • the S/H circuit 71 samples and holds a signal representing the amount of electricity received from the corresponding input converter 70 at a specified sampling frequency.
  • the multiplexer 72 sequentially selects the signals held in the plurality of sample and hold circuits 71.
  • A/D converter 73 converts the signal selected by multiplexer 72 into a digital value. Note that by providing a plurality of A/D converters 73, A/D conversion may be performed in parallel on detection signals of a plurality of input channels.
  • the CPU 74 controls the entire control device 100 and executes arithmetic processing according to a program.
  • RAM 75 as a volatile memory
  • ROM 76 as a non-volatile memory are used as main memory of the CPU 74.
  • the ROM 76 stores programs, signal processing settings, and the like.
  • the auxiliary storage device 78 is a non-volatile memory with a larger capacity than the ROM 76, and stores programs, data of the detected amount of electricity, and the like.
  • the input/output interface 77 is an interface circuit for communicating between the CPU 74 and external devices.
  • control device 100 it is also possible to configure at least a portion of the control device 100 using circuits such as FPGA and ASIC.
  • FIG. 5 is a block diagram showing an example of the functional configuration of the command generation section.
  • command generation section 101 includes a PLL (Phase Locked Loop) circuit 52, a constant setting section 54, a generator simulating section 60, a phase generation section 85, and a voltage command generation section 90.
  • Command generation section 101 further includes coordinate conversion sections 31 and 32 and AC power calculation section 35. In the following description, it is assumed that each signal is converted into a PU (Per Unit) inside the control device 100 (specifically, the command generation section 101).
  • PU Per Unit
  • the PLL circuit 52 detects the voltage phase ⁇ pll of the AC voltage Vsys detected by the AC voltage detector 7. Specifically, the PLL circuit 52 uses the AC voltage Vsys as an input signal using a feedback loop, and uses a signal whose phase is synchronized with this input signal as the detected voltage phase value (i.e., ⁇ pll) of the AC voltage Vsys. Output.
  • the constant setting section 54 sets the rotor of the synchronous generator (i.e., virtual synchronous generator) to be simulated by the power converter 20 (for example, the generator simulating section 60) based on the AC voltage Vsys of the power system 2.
  • a moment of inertia (ie, an inertia constant) M and a damping constant D are set.
  • the constant setting unit 54 adjusts the inertia constant M and the active power input and output between the power system 2 and the power converter 20. Set the damping constant D. Details of the constant setting section 54 will be described later.
  • the active power command value Pref is, for example, the active power command value P1 in response to a request from a host device. Further, the active power command value Pref may be an active power command value P2 as a frequency adjustment amount corresponding to governor-free operation of the synchronous generator when the frequency of the power system 2 fluctuates. Furthermore, the active power command value Pref may be an active power command value P3 for causing the DC voltage Vdc of the power storage element 40 to follow the DC voltage command value. Alternatively, the active power command value Pref may be an added value obtained by adding at least two of the active power command values P1 to P3.
  • the generator simulator 60 generates the angular frequency deviation ⁇ by simulating the characteristics of the synchronous generator based on the active power command value Pref and the active power Ps output from the power converter.
  • the generator simulator 60 includes a subtracter 62 , an integrator 63 , a high-pass filter 64 , and a proportional device 65 .
  • the integrator 63 time-integrates the output value of the subtracter 62 and outputs the angular frequency deviation ⁇ .
  • "M" of the integrator 63 is the inertia constant of the synchronous generator.
  • the angular frequency deviation ⁇ outputted by the integrator 63 corresponds to the difference between the angular frequency of the rotor and the reference angular frequency ⁇ 0 in the virtual synchronous generator.
  • the reference angular frequency ⁇ 0 is the angular frequency of the reference frequency (for example, 50 Hz or 60 Hz) of power in the power system 2.
  • the high-pass filter 64 performs high-pass filter processing on the angular frequency deviation ⁇ and outputs it to the proportional device 65.
  • the proportional device 65 outputs a multiplication value "D ⁇ " of the angular frequency deviation ⁇ after high-pass filter processing and the damping constant D.
  • the subtracter 62 outputs a value obtained by subtracting the multiplication value “D ⁇ ” from the deviation ⁇ P to the integrator 63.
  • the integrator 63 integrates the output value of the subtracter 62 over time, thereby simulating the braking force of the synchronous generator in controlling the power converter 20.
  • the phase generation unit 85 generates a reference phase ⁇ of the output voltage of the power converter 20 based on the angular frequency deviation ⁇ and the reference angular frequency ⁇ 0.
  • phase generation section 85 includes an adder 86 and an integrator 87.
  • the integrator 87 time-integrates the angular frequency ⁇ to generate a reference phase ⁇ .
  • Voltage command value of output voltage A functional configuration related to generation of a voltage command value (namely, voltage amplitude command value) of the output voltage of the power converter 20 will be described.
  • the coordinate conversion unit 31 performs three-phase/two-phase conversion on the alternating currents Isysu, Isysv, and Isysw using the reference phase ⁇ , and calculates the d-axis current Id and the q-axis current Iq.
  • the coordinate conversion unit 32 performs three-phase/two-phase conversion on the AC voltages Vsysu, Vsysv, and Vsysw using the reference phase ⁇ , and calculates the d-axis voltage Vd and the q-axis voltage Vq.
  • harmonic components of the d-axis current Id and the q-axis current Iq are removed by a moving average filter or the like.
  • harmonic components of the d-axis voltage Vd and the q-axis voltage Vq are removed by a moving average filter or the like.
  • the active power Ps is input to the subtracter 56, and the reactive power Qs is input to the subtracter 37.
  • the voltage command generation unit 90 generates a voltage command value Vref of the output voltage of the power converter 20.
  • the voltage command value Vref includes a d-axis voltage command value Vdref and a q-axis voltage command value Vqref.
  • the voltage command value generated by the voltage command generation unit 90 may be referred to as a "reference voltage command value.”
  • Voltage command generation section 90 includes a positive-sequence voltage calculation section 36 , subtracters 37 and 38 , voltage adjustment section 91 , coordinate conversion sections 92 and 94 , and adder 93 .
  • the positive-sequence voltage calculation unit 36 calculates the positive-sequence voltage Vpos based on the d-axis voltage Vd and the q-axis voltage Vq.
  • the voltage adjustment unit 91 selects either the automatic reactive power adjustment mode or the automatic voltage adjustment mode, and generates the voltage amplitude adjustment amount ⁇ Vacref based on the selected mode. Specifically, when the automatic reactive power adjustment mode is selected, the voltage adjustment unit 91 generates the voltage amplitude adjustment amount ⁇ Vacref through feedback control to make the deviation ⁇ Q equal to or less than a specified value (for example, 0). When the automatic voltage adjustment mode is selected, the voltage adjustment unit 91 generates the voltage amplitude adjustment amount ⁇ Vacref through feedback control to make the deviation ⁇ Vpos less than or equal to a specified value (for example, 0).
  • the voltage adjustment section 91 includes a PI controller, a first-order delay element, and the like.
  • the coordinate conversion unit 92 converts the d-axis component (i.e., the specified d-axis voltage command value Vdx and the q-axis component (i.e., the specified q-axis voltage command value Vqx) of the specified voltage command value into amplitude
  • the specified d-axis voltage command value Vdx and the specified q-axis voltage command value Vqx are values set in advance by a system operator, etc.
  • the adder 93 adds the amplitude
  • the coordinate conversion unit 94 transforms the amplitude
  • the signal generation unit 103 in FIG. 1 generates a control signal for the power converter 20 based on the reference phase ⁇ and reference voltage command value Vref generated by the command generation unit 101 described above.
  • FIG. 6 is a block diagram showing an example of the configuration of the constant setting section.
  • constant setting section 54 includes a first setting section 201 and a second setting section 202.
  • the first setting unit 201 sets the inertia constant M based on the phase difference ⁇ between the phase ⁇ pll of the AC voltage Vsys of the power system 2 and the reference phase ⁇ of the output voltage of the power converter 20.
  • the first setting unit 201 decreases the inertia constant M.
  • the first setting unit 201 returns the inertia constant M to the initial value.
  • the first setting section 201 includes a subtracter 111, an absolute value calculator 112, a comparator 113, and a switch 114.
  • the subtracter 111 calculates the difference between the phase ⁇ pll and the reference phase ⁇ .
  • the absolute value calculator 112 calculates the phase difference ⁇ as the absolute value of the difference.
  • the comparator 113 compares the phase difference ⁇ and the threshold value ⁇ th, and outputs a constant Cr1 according to the comparison result. When the phase difference ⁇ is greater than or equal to the threshold value ⁇ th, the comparator 113 outputs a constant Cr1 with a value of “1”. When the phase difference ⁇ is less than the threshold value ⁇ th, the comparator 113 outputs a constant Cr1 having a value of “0”.
  • the switch 114 When the switch 114 receives the constant Cr1 having the value "0", it sets the value of the inertia constant M to M0. When the switch 114 receives the constant Cr1 having the value "1”, the switch 114 sets the value of the inertia constant M to M1 (M1 ⁇ M0).
  • the value of the inertia constant M is set to the initial value M0.
  • Initial value M0 is, for example, a discharge time constant of power storage element 40.
  • the discharge time constant is the time required until the discharge is completed when the electricity storage element 40 charged to the rated voltage is discharged at the rated current.
  • the switch 114 switches the value of the inertia constant M to M1, which is smaller than the initial value M0.
  • the switch 114 returns (i.e., switches) the value of the inertia constant M from M1 to the initial value M0.
  • the first setting unit 201 may set the inertia constant M in proportion to the magnitude of the phase difference ⁇ .
  • the first setting unit 201 may be configured to decrease the inertia constant M as the phase difference ⁇ increases.
  • the inertia constant M is set to be small when the phase of the AC voltage Vsys fluctuates (that is, when the phase difference ⁇ becomes large). Thereby, it is possible to suppress an increase in the input and output of active power (that is, a fluctuation in active power) due to an increase in the phase difference ⁇ . Therefore, it is possible to prevent an overvoltage in the DC voltage of the power converter 20 that may occur when the input/output of active power is large, and as a result, the power converter 20 can continue to operate without a protective stop.
  • the second setting unit 202 sets the damping constant D based on the effective voltage Vq of the AC voltage Vsys of the power system 2 (that is, corresponding to the q-axis voltage Vq). Specifically, when the effective voltage Vq is less than the threshold value Vqth, the second setting unit 202 increases the damping constant D. On the other hand, when the effective voltage Vq becomes equal to or higher than the threshold value Vqth, the second setting unit 202 returns the damping constant D to the initial value.
  • the second setting section 202 includes an absolute value calculator 115, a comparator 116, and a switch 117.
  • the absolute value calculator 115 calculates the absolute value of the effective voltage Vq (hereinafter also referred to as effective voltage
  • Comparator 116 compares effective voltage
  • the value of the damping constant D is set to the initial value D0.
  • the initial value D0 is set, for example, to a damping constant of a synchronous generator having the same capacity as the power converter 20.
  • the switch 117 switches the value of the damping constant D to D1, which is larger than the initial value D0.
  • the switch 117 returns (switches) the value of the damping constant D from D1 to the initial value D0.
  • the second setting unit 202 may set the damping constant D in proportion to the magnitude of the effective voltage
  • the second setting unit 202 may be configured to increase the damping constant D as the effective voltage
  • the damping constant D is set to be large when the effective voltage of the AC voltage Vsys fluctuates (that is, when the effective voltage
  • the power converter 200 Since the power converter 200 according to the present embodiment is a voltage-controlled power converter having virtual synchronous machine control, the power converter 200 has a short circuit capacity ratio (SCR) of 1 or less in the power system 2. Stable operation is possible even in weak systems.
  • SCR short circuit capacity ratio
  • the power converter 200 if a phase difference occurs between the output voltage of the power converter 20 and the grid voltage due to a grid fault or the like, and the output voltage decreases, the effective Power input/output increases.
  • the inertia constant M and the damping constant D are set so that the input/output of active power becomes small according to fluctuations in the phase difference ⁇ and the effective voltage
  • the constant setting unit 54 has explained the configuration in which the inertia constant M and the damping constant D are set based on the AC voltage Vsys of the power system 2, but the configuration is not limited to this.
  • the constant setting unit 54 may set only the inertia constant M based on the phase difference ⁇ .
  • the damping constant D is fixed to the initial value D0.
  • the constant setting section 54 may set only the damping constant D based on the effective voltage Vq.
  • the inertia constant M is fixed to the initial value M0.
  • the constant setting section 54 may have only the first setting section 201 or only the second setting section 202. Therefore, the constant setting unit 54 may be configured to set at least one of the inertia constant M and the damping constant D based on the AC voltage Vsys of the power system 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
PCT/JP2022/021899 2022-05-30 2022-05-30 電力変換装置、および制御装置 Ceased WO2023233454A1 (ja)

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EP22944744.6A EP4535591A4 (en) 2022-05-30 2022-05-30 POWER CONVERSION DEVICE AND CONTROL DEVICE
US18/868,572 US20250357761A1 (en) 2022-05-30 2022-05-30 Power conversion device
PCT/JP2022/021899 WO2023233454A1 (ja) 2022-05-30 2022-05-30 電力変換装置、および制御装置
JP2022550807A JP7183486B1 (ja) 2022-05-30 2022-05-30 電力変換装置、および制御装置

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WO2022269811A1 (ja) * 2021-06-23 2022-12-29 三菱電機株式会社 制御装置、および電力変換装置
CN119563280A (zh) * 2023-06-30 2025-03-04 株式会社Tmeic 电压控制装置以及电压控制方法
KR102890596B1 (ko) * 2024-01-03 2025-11-26 한국에너지기술연구원 응답 속도가 개선된 그리드 포밍 인버터 및 그 제어방법
CN118263888B (zh) * 2024-05-28 2024-08-20 西安热工研究院有限公司 一种超级电容混合储能协调控制方法及系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009225599A (ja) * 2008-03-18 2009-10-01 Kawasaki Heavy Ind Ltd 電力変換装置
US20140067138A1 (en) * 2011-02-28 2014-03-06 Abengoa Solar New Technologies, S.A. Virtual controller of electromechanical characteristics for static power converters
JP2019004571A (ja) * 2017-06-13 2019-01-10 株式会社日立製作所 新エネルギー源統合電力変換装置
JP2019154219A (ja) * 2018-03-01 2019-09-12 富士電機株式会社 制御装置及び制御方法
JP2019176584A (ja) 2018-03-28 2019-10-10 株式会社日立製作所 分散電源の制御装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113452015B (zh) * 2021-06-03 2022-10-25 湖南大学 基于参数灵活调控的虚拟同步发电机暂态控制方法
CN113612250B (zh) * 2021-07-05 2024-02-06 武汉理工大学 基于频率偏差的虚拟同步发电机变惯量阻尼协同控制方法
CN113629782B (zh) * 2021-07-20 2024-10-29 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 一种自适应惯量的虚拟同步机控制方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009225599A (ja) * 2008-03-18 2009-10-01 Kawasaki Heavy Ind Ltd 電力変換装置
US20140067138A1 (en) * 2011-02-28 2014-03-06 Abengoa Solar New Technologies, S.A. Virtual controller of electromechanical characteristics for static power converters
JP2019004571A (ja) * 2017-06-13 2019-01-10 株式会社日立製作所 新エネルギー源統合電力変換装置
JP2019154219A (ja) * 2018-03-01 2019-09-12 富士電機株式会社 制御装置及び制御方法
JP2019176584A (ja) 2018-03-28 2019-10-10 株式会社日立製作所 分散電源の制御装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4535591A4

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US20250357761A1 (en) 2025-11-20
EP4535591A4 (en) 2025-07-02

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