JP6196525B2 - Control circuit for controlling inverter circuit, inverter device provided with the control circuit, power system provided with the inverter device, and control method - Google Patents

Description

  The present invention relates to a control circuit that controls an inverter circuit, an inverter device that includes the control circuit, a power system that includes the inverter device, and a control method.

  2. Description of the Related Art Conventionally, an inverter device has been developed that converts DC power generated by a solar cell or the like into AC power and supplies it to an electric power system. In addition, in a photovoltaic power plant such as a mega solar power generator, a large amount of power is supplied to the power system by connecting a large number of inverter devices in parallel. SVC (Static Var Compensator: Static Reactive Power Compensator) is also connected in parallel to alleviate the voltage rise of the transmission line that sends power from the photovoltaic power plant to the power system. Mainly, SVC compensates reactive power, thereby controlling the voltage at the interconnection point where each inverter device is connected in parallel to suppress the voltage rise of the transmission line.

  FIG. 14 is a diagram showing a photovoltaic power plant in which a plurality of conventional general inverter devices are connected in parallel.

  Each inverter device A 'converts the DC power generated by the DC power source 1 including the solar battery into AC power and outputs the AC power. A large number of inverter devices A 'are connected in parallel, and the electric power output from each inverter device A' is combined and supplied to the power system B. Each inverter device A 'includes an inverter circuit 2 and a control circuit 3'. The inverter circuit 2 converts a DC voltage input from the DC power source 1 into an AC voltage by switching a switching element (not shown) based on the PWM signal input from the control circuit 3 ′. The control circuit 3 ′ generates and outputs a PWM signal for controlling the inverter circuit 2. The control circuit 3 'includes a reactive power control unit 30'. The reactive power control unit 30 'performs control so that the output reactive power of the inverter device A' becomes a target value. The inverter device A ″ constitutes the SVC and has the same configuration as the inverter device A ′.

  The monitoring device C is for centrally monitoring each inverter device A ′ and the inverter device A ″, and sets a target value of output reactive power of each inverter device A ′, A ″ (for example, see Patent Document 1). ). The monitoring device C causes the inverter device A ″ to compensate the reactive power as much as possible, and causes the inverter devices A ′ to evenly compensate for the amount that the inverter device A ″ cannot compensate. Further, when the temperature of a certain inverter device A ′ rises or when capacity is severe, the monitoring device C reduces reactive power to be compensated by the inverter device A ′, and other inverter devices A ′, A ”.

JP2013-99132A

Reza Olfati-Saber, J. Alex Fax, and Richard M. Murray, "Consensus and Cooperation in Networked Multi-Agent Systems", Proceedings of the IEEE, Vol. 95, No. 1, (2007) Mehran Mesbahi and Magnus Egerstedt, "Graph Theoretic Methods in Multiagent Networks", Princeton (2010)

  However, when the monitoring device C sets the target value of the output reactive power of each inverter device A ′, A ″, the system becomes a large scale, and it is difficult to flexibly cope with the increase / decrease in the inverter devices A ′, A ″. Are vulnerable. That is, it is necessary to provide a monitoring device C and communicate with each inverter device A ′, A ″. In the case of wired communication, the monitoring device C and each inverter device A ′, A ″ are connected by a communication line. There is a need. In the case of wireless communication, it is necessary to prevent radio waves from being blocked by obstacles. Further, when the inverter devices A ′ and A ″ are increased or decreased, it is necessary to change the control program of the monitoring device C. Further, when the monitoring device C fails, there is a problem that the target value cannot be set. Even when one inverter device A ′ (master) having the function of the monitoring device C outputs a target value to the other inverter devices A ′ and A ″ (slave), the same problem occurs.

  In addition, there is a limit to compensation for reactive power. For example, when the capacity of each inverter device A ′, A ″ is small or when the minimum value of the power factor is determined, it is not possible to compensate for the reactive power until the voltage rise of the transmission line is alleviated. When the reactance component of the line impedance of the transmission line is smaller than the resistance component, it becomes difficult to compensate by reactive power, and there is a method of suppressing the output active power of each inverter device A ′ in order to reduce the voltage rise of the transmission line. However, also in this case, in order to adjust the amount of suppression of the output active power of each inverter device A ′, the monitoring device C is necessary, and the same problem as described above arises.

  The present invention has been conceived under the circumstances described above, and provides a method capable of solving the above-described problems and adjusting the amount of suppression of the output active power of each inverter device A ′. Is the purpose.

  In order to solve the above problems, the present invention takes the following technical means.

  The control circuit provided by the first aspect of the present invention is a control circuit that controls an inverter circuit included in each inverter device in a power system in which a plurality of inverter devices that are not in a master-slave relationship are connected in parallel, An input voltage control means for generating an active power compensation value for controlling the voltage input to the inverter device; a connection point voltage control means for generating a compensation value for controlling the connection point voltage to a target value; Coordinate correction value generation means for generating a correction value for cooperating with each of the inverter devices, addition means for adding the correction value to the compensation value to calculate a correction compensation value, and the correction from the active power compensation value PWM signal generating means for generating a PWM signal based on the subtracted compensation value, weighting means for weighting the correction compensation value, and at least one other image Communication means for communicating with a barter device, wherein the communication means transmits a weighted correction compensation value to the other inverter device, and the cooperative correction value generation means comprises the weighted correction compensation value and The correction value is generated by using the calculation result based on the reception compensation value received from the other inverter device by the communication means. Note that “not in the master-slave relationship” means that one of the inverter devices (master: master) does not monitor or control the other (slave: slave), but all have equal relationships. Means. The “electric power system” means, for example, a power plant (for example, a mega solar) in which a large number of inverter devices are connected in parallel to perform solar power generation, a wind farm that performs wind power generation, or the like.

  In a preferred embodiment of the present invention, the cooperative correction value generation means includes a calculation means for performing a calculation based on the weighted correction compensation value and the reception compensation value, and a calculation result output by the calculation means. Integrating means for integrating to calculate the correction value.

  In a preferred embodiment of the present invention, the calculation means calculates the calculation result by subtracting the weighted correction compensation value from the reception compensation value and adding all the subtraction results.

  In a preferred embodiment of the present invention, the calculating means subtracts the weighted correction compensation values from the reception compensation values, adds all the subtraction results, and the communication means performs communication. The operation result is calculated by dividing by the number of inverter devices.

  In a preferred embodiment of the present invention, the computing means subtracts the weighted correction compensation value from the reception compensation value, adds all the subtraction results, and multiplies the weighted correction compensation value. Thus, the calculation result is calculated.

  In a preferred embodiment of the present invention, the calculation means subtracts the reception compensation value from the weighted correction compensation value, adds all the subtraction results, and squares the weighted correction compensation value. The result of the operation is calculated by multiplying.

  In a preferred embodiment of the present invention, the weighting means performs weighting by dividing the correction compensation value by a preset weighting value.

  In a preferred embodiment of the present invention, the apparatus further comprises temperature detecting means for detecting the temperature of the inverter circuit, and weighting value setting means for setting a weighting value corresponding to the temperature, wherein the weighting means includes the weighting value. Weighting is performed by dividing the correction compensation value by the weighting value set by the setting means.

  In a preferred embodiment of the present invention, the clock means for outputting the date or time, and the weight value are stored in association with the date or time, and the date or time corresponding to the date or time output by the clock means is stored. Weighting value setting means for setting a weighting value, and the weighting means performs weighting by dividing the correction compensation value by the weighting value set by the weighting value setting means.

  In a preferred embodiment of the present invention, the weighting unit further includes an active power calculating unit that calculates an output active power of the inverter circuit, and a weighting value setting unit that sets a weighting value corresponding to the output active power. Performs weighting by dividing the correction compensation value by the weighting value set by the weighting value setting means.

  The inverter device provided by the second aspect of the present invention includes the control circuit provided by the first aspect of the present invention and an inverter circuit.

  The power system provided by the third aspect of the present invention is characterized in that a plurality of inverter devices provided by the second aspect of the present invention are connected in parallel.

  A control method provided by a fourth aspect of the present invention is a control method for controlling an inverter circuit included in each inverter device in a power system in which a plurality of inverter devices that are not in a master-slave relationship are connected in parallel. A first step of generating an active power compensation value for controlling a voltage input to the apparatus; a second step of generating a compensation value for controlling a connection point voltage to a target value; and each of the inverters A third step of generating a correction value for cooperating with the apparatus; a fourth step of calculating a correction compensation value by adding the correction value to the compensation value; and the correction compensation value from the active power compensation value. A fifth step of generating a PWM signal based on the subtracted value, a sixth step of weighting the correction compensation value, and adding the weighted correction compensation value to at least one other inverse A seventh step of transmitting to the device and an eighth step of receiving the value transmitted by the other inverter device as a reception compensation value are performed by each inverter device, and the third step includes: The correction value is generated using a calculation result based on the weighted correction compensation value and the reception compensation value received in the eighth step.

  According to the present invention, the cooperative correction value generation means generates a correction value using a calculation result based on the weighted correction compensation value and the reception compensation value. When the cooperative correction value generating means of each inverter device performs this, the weighted correction compensation values of all the inverter devices converge to the same value. Therefore, the correction compensation value of each inverter device is a value corresponding to each weight. Since the suppression amount of the output active power of each inverter device is adjusted based on the correction compensation value, the suppression amount of the output active power can be adjusted according to the weighting. Each inverter device only needs to perform mutual communication with at least one inverter device (for example, a device located in the vicinity or a device with which communication has been established). There is no need to communicate with the inverter device. Therefore, the system does not become a big deal. Even when a certain inverter device breaks down, it is only necessary that all other inverter devices can communicate with any one of the inverter devices. Moreover, it can respond flexibly to the increase / decrease of the inverter device.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a figure for demonstrating the inverter apparatus which concerns on 1st Embodiment. It is a figure which shows the solar power plant which concerns on 1st Embodiment. It is a figure for demonstrating the connection point voltage control system of an inverter apparatus. It is a figure for demonstrating the connection point voltage control system of the whole electric power system. 3 is a graph representing the power system shown in FIG. It is a figure showing the control system of the connection point voltage of the whole electric power system which concerns on 1st Embodiment. It is a figure for demonstrating the internal structure of a current control part. It is a figure which shows the simulation result which confirmed the fluctuation | variation suppression of the connection point voltage in an electric power system. It is a figure which shows the simulation result which confirmed the fluctuation | variation suppression of the connection point voltage in an electric power system. It is a figure which shows the simulation result which confirmed the fluctuation | variation suppression of the connection point voltage in an electric power system. It is a figure for demonstrating the inverter apparatus which concerns on 2nd Embodiment. It is a figure for demonstrating the inverter apparatus which concerns on 3rd Embodiment. It is a figure for demonstrating the inverter apparatus which concerns on 4th Embodiment. It is a figure which shows the solar power plant in which the conventional general inverter apparatus was connected in multiple numbers.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings, taking as an example a case where a control circuit according to the present invention is used in an inverter device of a solar power plant.

  FIG. 1 is a diagram for explaining the inverter device according to the first embodiment. FIG. 2 is a diagram illustrating a photovoltaic power plant (power system) in which a plurality of inverter devices according to the first embodiment are connected in parallel.

  The inverter device A is a so-called power conditioner, and includes an inverter circuit 2, a control circuit 3, a current sensor 4, a voltage sensor 5, and a DC voltage sensor 6, as shown in FIG. The inverter device A converts the DC power output from the DC power source 1 into AC power by the inverter circuit 2 and outputs the AC power. Although not shown, a transformer for boosting (or stepping down) the AC voltage is provided on the output side of the inverter circuit 2.

  Further, as shown in FIG. 2, the inverter device A is connected in parallel with the other inverter device A. FIG. 2 shows a state where four inverter devices A (A1 to A4) are connected. In the actual power system, more inverter devices A are connected, but for the sake of simplicity of explanation, extremely few cases are shown.

  The arrows shown in FIG. 2 indicate that communication is being performed. That is, the inverter device A1 performs mutual communication only with the inverter device A2, and the inverter device A2 performs mutual communication only with the inverter device A1 and the inverter device A3. Further, the inverter device A3 performs mutual communication only with the inverter device A2 and the inverter device A4, and the inverter device A4 performs mutual communication only with the inverter device A3.

  Returning to FIG. 1, the DC power source 1 outputs DC power and includes a solar cell. A solar cell generates direct-current power by converting solar energy into electrical energy. The DC power source 1 outputs the generated DC power to the inverter circuit 2. Note that the DC power source 1 is not limited to one that generates DC power from a solar cell. For example, the DC power source 1 may be a fuel cell, a storage battery, an electric double layer capacitor, a lithium ion battery, or AC power generated by a diesel engine generator, a micro gas turbine generator, a wind turbine generator, or the like. It may be a device that converts to DC power and outputs it.

  The inverter circuit 2 converts DC power input from the DC power source 1 into AC power and outputs the AC power. The inverter circuit 2 includes a PWM control inverter and a filter (not shown). The PWM control inverter is a three-phase inverter provided with three sets of six switching elements (not shown). Based on the PWM signal input from the control circuit 3, each switching element is switched on and off to generate DC power. Convert to AC power. The filter removes high frequency components due to switching. The inverter circuit 2 is not limited to this. For example, the PWM control inverter may be a single-phase inverter or a multi-level inverter. Further, the present invention is not limited to PWM control, and other methods such as phase shift control may be used.

  The current sensor 4 detects an instantaneous value of the three-phase output current of the inverter circuit 2. The current sensor 4 digitally converts the detected instantaneous value and outputs it to the control circuit 3 as current signals Iu, Iv, Iw (the three current signals may be collectively described as “current signal I”). . The voltage sensor 5 detects an instantaneous value of the three-phase interconnection point voltage of the inverter device A. The voltage sensor 5 digitally converts the detected instantaneous value, calculates an effective value, and outputs it to the control circuit 3 as a voltage signal V. The DC voltage sensor 6 detects the input voltage of the inverter circuit 2. The DC voltage sensor 6 digitally converts the detected voltage and outputs it to the control circuit 3 as a voltage signal Vdc.

  The control circuit 3 controls the inverter circuit 2 and is realized by, for example, a microcomputer. The control circuit 3 according to the present embodiment controls the input voltage, output reactive power, output current, and interconnection point voltage of the inverter circuit 2. Among these, about the connection point voltage, all the inverter apparatuses A (A1-A4) (refer FIG. 2) connected to the electric power system control in cooperation.

  Below, the control system of the connection point voltage which concerns on this invention is demonstrated with reference to FIGS.

  FIG. 3 is a diagram for explaining the interconnection point voltage control system of the inverter device A.

FIG. 3A shows a model of a general inverter device. The active power output from the inverter device is P, the reactive power is Q, the d-axis component and the q-axis component of the output current of the inverter device are Id and Iq (respective target values are Id ^* and Iq ^* ). The d-axis component and the q-axis component are two-phase components of the rotating coordinate system after being converted by a three-phase / two-phase converting process and a rotating coordinate converting process described later. Assuming that the internal phase of the inverter device completely follows the phase of the interconnection point voltage, the q-axis component of the output voltage is Vq = 0, and the d-axis component is Vd = V (the interconnection point voltage). Effective value)
P = Vd · Id + Vq · Iq = V · Id
Q = Vd · Iq−Vq · Id = V · Iq
It has become.

In the present invention, since the increase of the connection point voltage is reduced by suppressing the output active power, a control system for suppressing the increase of the connection point voltage is added to the model of FIG. FIG. 3 (b) shows a model in which a control system for suppressing the increase of the interconnection point voltage is added. In FIG. 3 (b), a connection point voltage control system for inputting the deviation ΔV from the target value of the connection point voltage V and outputting the connection point voltage compensation value ΔId ^* is added, and the connection point voltage compensation is performed. The value ΔId ^* is subtracted from the target value Id ^* of the d-axis component of the output current.

The dynamics of the current control system, the PWM and the inverter main circuit can be ignored because they are faster than the dynamics of the power control system. FIG. 3C shows a model approximated by ignoring these. Note that Id ′ ^* = Id ^* −ΔId ^* .

  FIG. 3D shows a model in which only the interconnection point voltage control system is focused on in the model of FIG.

FIG. 4 is a diagram for explaining an interconnection point voltage control system of the entire power system. The active power output from each of the inverter devices A1 to A4 is changed by ΔP ₁ to ΔP ₄ respectively, and the active power supplied to the interconnection point is changed by a change amount ΔP obtained by adding these. The interconnection point voltage V fluctuates due to fluctuations in the supplied effective power P. These are shown in FIG. Note that R is a resistance component of the line impedance of the transmission line. Further, the fluctuation (disturbance) ΔPw of the active power includes a fluctuation due to a load fluctuation or a change in the output of the solar cell. FIG. 4 shows a system that suppresses fluctuations in the interconnection point voltage by adjusting the active power of each inverter device A. However, in this case, since each inverter device A does not cooperate to suppress the output active power, the output active power that each inverter device A suppresses is determined by the internally set gain, the arrangement location, and the like. End up. For example, it is impossible to suppress the output active power of the inverter device A1 by half of the other devices and to suppress the inverter devices A2 to A4 evenly or according to the capacity of each inverter device A.

  Next, a method for controlling the output active power in cooperation with each inverter device A will be described.

  There is known a consensus algorithm for converging a plurality of control target state values to the same value (see Non-Patent Documents 1 and 2). When each control target is a vertex and the communication state between each control target is expressed as a graph, if the graph is connected by an undirected graph in the graph theory, the state of each control target is determined using a consensus algorithm. The values can converge to the same value to achieve consensus. For example, when the power system shown in FIG. 2 is expressed in a graph, it is as shown in FIG. Vertices A1 to A4 represent inverter devices A1 to A4, respectively, and sides with arrows represent communication states between the inverter devices. Each side indicates that mutual communication is performed, and the graph is an undirected graph. Since a communication path exists for any two vertices of the graph, the graph is connected. Therefore, in the case of the power system shown in FIG. 2, consensus can be achieved. In addition, since the graphs shown in FIGS. 5B and 5C are also connected by undirected graphs, the communication states of the inverter devices A1 to A4 in the power system of FIG. Consensus can be achieved. In this way, the inverter device A performs mutual communication with at least one inverter device A among the inverter devices A connected to the power system, and any two inverter devices A connected to the power system. As long as a communication path exists (hereinafter, this state is referred to as a “connected state”), it is necessary to communicate with all inverter devices A connected to the power system. Absent.

In the present embodiment, the value of the state of each control target is not converged to the same value, but weighting is performed to converge the weighted value to the same value. That is, the weighting value W _i of each inverter device A is set in advance, weighting is performed by dividing the state value by the weighting value W _i , and the weighted value is converged to the same value. Thus, the value of each state converges to a value corresponding to the weighting value W _i. For example, if W ₁ = W ₂ = W ₃ = 1 and W ₄ = 10, the value of the state of the inverter device A4 converges to 10 times the value of the state of the other inverter device A.

  FIG. 6 is a system in which a consensus algorithm and weighting are added to the system shown in FIG. 4, and each inverter device A cooperates to suppress the active power that is its share, thereby reducing the fluctuation of the interconnection point voltage. It represents the control system to be suppressed.

The compensation value ΔId _i ′ (= ΔId _i ^* / W _i ) obtained by dividing the compensation value ΔId _i ^* by the weighting value W _i converges to the same value by the consensus algorithm. 'When, the inverter device A _i, the compensation value ^{_{ΔId i * = W i · ΔIdα}} ' the convergence value Derutaaidiarufa will suppress the effective power according to. That is, the active power corresponding to the weight value W _i is suppressed. Therefore, for example, if W ₁ = W ₂ = W ₃ = 1 and W ₄ = 10, the inverter device A4 can suppress the active power 10 times that of the other inverter devices A.

  Returning to FIG. 1, the control circuit 3 performs PWM based on the current signal I input from the current sensor 4, the voltage signal V input from the voltage sensor 5, and the voltage signal Vdc input from the DC voltage sensor 6. A signal is generated and output to the inverter circuit 2. The control circuit 3 includes a reactive power control unit 30, an input voltage control unit 31, a connection point voltage control unit 32, a cooperative correction value generation unit 33, an adder 34, a current control unit 35, a command signal generation unit 36, and a PWM signal generation. A unit 37, a weighting unit 38, and a communication unit 39.

The reactive power control unit 30 is for controlling the output reactive power of the inverter circuit 2. Although not shown, the reactive power control unit 30 calculates the output reactive power of the inverter circuit 2 from the instantaneous value of the current detected by the current sensor 4 and the instantaneous value of the voltage detected by the voltage sensor 5, and the target value The PI control (proportional integral control) is performed on the deviation from, and the reactive power compensation value is output. The reactive power compensation value is input to the current control unit 35 as the target value Iq ^* . The control of the reactive power control unit 30 is not limited to PI control, and other control such as I control (integration control) may be performed.

The input voltage control unit 31 is for controlling the input voltage of the inverter circuit 2. The input voltage control unit 31 controls the input power by controlling the input voltage, thereby controlling the output active power of the inverter circuit 2. The input voltage control unit 31 receives a deviation ΔVdc between the voltage signal Vdc input from the DC voltage sensor 6 and the input voltage target value Vdc ^* that is a target value thereof, performs PI control, and outputs an active power compensation value. . The control of the input voltage control unit 31 is not limited to PI control, and other control such as I control may be performed.

The connection point voltage control unit 32 is for controlling the connection point voltage. The connection point voltage control unit 32 controls the connection point voltage by suppressing and controlling the active power output from the inverter circuit 2. The connection point voltage control unit 32 receives a deviation ΔV between the voltage signal V input from the voltage sensor 5 and the connection point voltage target value V ^{* that} is a target value thereof, performs PI control, and performs the connection point voltage. Output the compensation value. The interconnection point voltage compensation value is input to the adder 34. The control of the interconnection point voltage control unit 32 is not limited to PI control, and other control such as I control may be performed.

  The cooperation correction value generation unit 33 generates a cooperation correction value for cooperation with each inverter device A. Details of the cooperative correction value generation unit 33 will be described later.

The adder 34 calculates the correction compensation value ΔId _i ^* by adding the cooperation correction value input from the cooperation correction value generation unit 33 to the connection point voltage compensation value input from the connection point voltage control unit 32. To do. The active power compensation value output from the input voltage control unit 31 is subtracted from the correction compensation value ΔId _i ^* output from the adder 34 and input to the current control unit 35 as the target value Id ^* . The adder 34 also outputs the calculated correction compensation value ΔId _i ^* to the weighting unit 38.

  The current control unit 35 is for controlling the output current of the inverter circuit 2. The current control unit 35 generates a current compensation value based on the current signal I input from the current sensor 4 and outputs the current compensation value to the command signal generation unit 36.

  FIG. 7 is a functional block diagram for explaining the internal configuration of the current control unit 35.

  The current control unit 35 includes a three-phase / two-phase conversion unit 351, a rotation coordinate conversion unit 352, an LPF 353, an LPF 354, a PI control unit 355, a PI control unit 356, a stationary coordinate conversion unit 357, and a two-phase / three-phase conversion unit. 358.

  The three-phase / two-phase conversion unit 351 performs a so-called three-phase / two-phase conversion process (αβ conversion process). The three-phase / two-phase conversion process is a process that converts a three-phase AC signal into an equivalent two-phase AC signal. The three-phase AC signal is a stationary orthogonal coordinate system (hereinafter referred to as “static coordinate system”). In this case, the signals are decomposed into orthogonal α-axis and β-axis components and the components of the respective axes are added to each other, thereby converting into an AC signal of the α-axis component and an AC signal of the β-axis component. The three-phase / two-phase converter 351 converts the three-phase current signals Iu, Iv, and Iw input from the current sensor 4 into an α-axis current signal Iα and a β-axis current signal Iβ, and a rotational coordinate converter 352. Output to.

The conversion process performed by the three-phase / two-phase conversion unit 351 is represented by a determinant represented by the following equation (1).

  The rotation coordinate conversion unit 352 performs a so-called rotation coordinate conversion process (dq conversion process). The rotation coordinate conversion process is a process of converting a two-phase signal in the stationary coordinate system into a two-phase signal in the rotation coordinate system. The rotating coordinate system is an orthogonal coordinate system having orthogonal d-axis and q-axis and rotating in the same rotational direction at the same angular velocity as the fundamental wave of the interconnection point voltage. The rotating coordinate conversion unit 352 converts the α-axis current signal Iα and β-axis current signal Iβ of the stationary coordinate system input from the three-phase / two-phase conversion unit 351 based on the phase θ of the fundamental wave of the interconnection point voltage. It is converted into a d-axis current signal Id and a q-axis current signal Iq in the rotating coordinate system and output.

The conversion process performed by the rotation coordinate conversion unit 352 is expressed by a determinant represented by the following expression (2).

  LPF 353 and LPF 354 are low-pass filters and pass only the DC components of d-axis current signal Id and q-axis current signal Iq, respectively. Through the rotation coordinate conversion process, the fundamental wave components of the α-axis current signal Iα and the β-axis current signal Iβ are converted into DC components of the d-axis current signal Id and the q-axis current signal Iq, respectively. That is, the LPF 353 and the LPF 354 remove unbalanced components and harmonic components and pass only the fundamental wave components.

The PI control unit 355 performs PI control based on the deviation between the DC component of the d-axis current signal Id and the target value, and outputs a current compensation value Xd. The correction compensation value ΔId _i ^* is subtracted from the active power compensation value output from the input voltage control unit 31 and used as the target value Id ^* of the d-axis current signal Id. The PI control unit 356 performs PI control based on the deviation between the DC component of the q-axis current signal Iq and the target value Iq ^*, and outputs a current compensation value Xq. The reactive power compensation value output from reactive power control unit 30 is used as target value Iq ^* of q-axis current signal Iq.

  The stationary coordinate conversion unit 357 converts the current compensation values Xd and Xq respectively input from the PI control unit 355 and the PI control unit 356 into the current compensation values Xα and Xβ of the stationary coordinate system. In contrast to 352, the conversion processing is performed. The static coordinate conversion unit 357 performs a so-called static coordinate conversion process (inverse dq conversion process), and calculates the current compensation values Xd and Xq of the rotating coordinate system based on the phase θ and the current compensation value Xα of the static coordinate system. , Xβ.

The conversion process performed by the stationary coordinate conversion unit 357 is represented by a determinant represented by the following expression (3).

  The two-phase / three-phase conversion unit 358 converts the current compensation values Xα and Xβ input from the stationary coordinate conversion unit 357 into three-phase current compensation values Xu, Xv, and Xw. The two-phase / three-phase conversion unit 358 performs a so-called two-phase / three-phase conversion process (reverse αβ conversion process), and performs a conversion process opposite to the three-phase / two-phase conversion unit 351.

The conversion process performed by the two-phase / three-phase conversion unit 358 is represented by a determinant represented by the following equation (4).

  In addition, although this embodiment demonstrated the case where the inverter apparatus A was a three-phase system, a single phase system may be sufficient. In the case of a single-phase system, the current control unit 35 may control the single-phase current signal that detects the output current of the inverter circuit 2.

  The command signal generator 36 generates a command signal based on the current compensation values Xu, Xv, Xw input from the current controller 35 and outputs the command signal to the PWM signal generator 37.

  The PWM signal generation unit 37 generates a PWM signal. The PWM signal generation unit 37 generates a PWM signal by a triangular wave comparison method based on the carrier signal and the command signal input from the command signal generation unit 36. For example, a pulse signal that is high when the command signal is larger than the carrier signal and low when the command signal is equal to or less than the carrier signal is generated as a PWM signal. The generated PWM signal is output to the inverter circuit 2. The PWM signal generation unit 37 is not limited to the case where the PWM signal is generated by the triangular wave comparison method. For example, the PWM signal generation unit 37 may generate the PWM signal by a hysteresis method.

The weighting unit 38 weights the correction compensation value ΔId _i ^* input from the adder 34. A weighting value W _i is set in the weighting unit 38 in advance. The weighting unit 38 outputs the weighted correction compensation value ΔId _i ′ obtained by dividing the correction compensation value ΔId _i ^* by the weighting value W _i to the communication unit 39 and the cooperative correction value generation unit 33.

The weighting value W _i is set in advance according to the magnitude (suppression amount) of the output active power to be suppressed by the inverter device A. For example, since the capacity of the inverter device A1 (see FIG. 2) is larger than the capacity of the inverter devices A2 to A4, when it is desired to increase the suppression amount of the inverter device A1 (when it is desired to reduce the suppression amount of the inverter devices A2 to A4 as much as possible). , the weighting value W ₁ of the inverter device A1, set the larger value as compared with the weighting value W ₂ to _W-4 of the other inverter A2 to A4. The weighting values W _{2 to} W ₄ may be the same value in order to make the amount of suppression equal. It is also possible to set the weighting value W _i in accordance with the size of the solar cell panel is connected to the inverter A.

The communication unit 39 communicates with the control circuit 3 of the other inverter device A. The communication unit 39 receives the weighted correction compensation value ΔId _i ′ from the weighting unit 38 and transmits it to the communication unit 39 of another inverter device A. Further, the communication unit 39 outputs the compensation value ΔId _j ′ received from the communication unit 39 of the other inverter device A to the cooperative correction value generation unit 33. Note that the communication method is not limited, and may be wired communication or wireless communication.

For example, when the inverter device A is the inverter device A2 shown in FIG. 2, the communication unit 39 transmits the weighted correction compensation value ΔId ₂ ′ to the communication units 39 of the inverter devices A1 and A3, and the communication unit of the inverter device A1. 39 receives the compensation value ΔId ₁ ′, and receives the compensation value ΔId ₃ ′ from the communication unit 39 of the inverter device A3.

  Next, details of the cooperative correction value generation unit 33 will be described.

The cooperative correction value generation unit 33 receives the weighted correction compensation value ΔId _i ′ (hereinafter abbreviated as “compensation value ΔId _i ′”) input from the weighting unit 38 and the communication unit 39. Using the compensation value ΔId _j ′ of the other inverter device A, a cooperative correction value for cooperating with each inverter device A is generated. Even if the compensation value ΔId _i ′ and the compensation value ΔId _j ′ are different, the calculation value in the cooperative correction value generation unit 33 is repeated so that the compensation value ΔId _i ′ and the compensation value ΔId _j ′ are a common value. Converge to. As shown in FIG. 1, the cooperative correction value generation unit 33 includes a calculation unit 331, a multiplier 332, and an integrator 333.

The computing unit 331 performs computation based on the following equation (5). That is, the calculation unit 331 subtracts the compensation value ΔId _i ′ input from the weighting unit 38 from each compensation value ΔId _j ′ input from the communication unit 39, and adds the calculation result u _i obtained by adding all the subtraction results. The result is output to the multiplier 332.

For example, if the inverter apparatus A of the inverter device A2 (see FIG. 2), computation unit 331 performs calculation of the following equation (6), and outputs the operation result u _2.

The multiplier 332 multiplies the calculation result u _i input from the calculation unit 331 by a predetermined coefficient ε and outputs the result to the integrator 333. The coefficient ε is a value that satisfies 0 <ε <1 / d _max and is set in advance. d _max is the _maximum of all the inverter devices A connected to the power system among d _i that is the number of other inverter devices A with which the communication unit 39 communicates. That is, it is the number of compensation values ΔId _j ′ input to the communication unit 39 of the inverter device A connected to the power system that communicates with the largest number of other inverter devices A. Incidentally, the coefficient epsilon, operation result u _i becomes too large (small), in order to suppress the fluctuation of the cooperative correction value becomes too large, it is intended to be multiplied to the calculation result u _i. Therefore, when the process in the cooperative correction value generation unit 33 is a continuous time process, it is not necessary to provide the multiplier 332.

  The integrator 333 generates and outputs a cooperative correction value by integrating the value input from the multiplier 332. The integrator 333 generates a cooperative correction value by adding the value input from the multiplier 332 to the previously generated cooperative correction value. The cooperative correction value is output to the adder 34.

  In the present embodiment, the case where the control circuit 3 is realized as a digital circuit has been described, but it may be realized as an analog circuit. Further, the processing performed by each unit may be designed by a program, and the computer may function as the control circuit 3 by executing the program. The program may be recorded on a recording medium and read by a computer.

In the present embodiment, the cooperative correction value generation unit 33 uses the compensation value ΔId _i ′ input from the weighting unit 38 and the compensation value ΔId _j ′ of the other inverter device A input from the communication unit 39. Then, a cooperative correction value is generated. When the compensation value ΔId _i ′ is larger than the arithmetic mean value of the respective compensation values ΔId _j ′, the computation result u _i output from the computation unit 331 becomes a negative value. Then, the cooperative correction value becomes small, and the compensation value ΔId _i ′ also becomes small. On the other hand, when the compensation value ΔId _i ′ is smaller than the arithmetic mean value of the respective compensation values ΔId _j ′, the computation result u _i output from the computation unit 331 becomes a positive value. As a result, the cooperative correction value increases and the compensation value ΔId _i ′ also increases. That is, the compensation value ΔId _i ′ approaches the arithmetic mean value of each compensation value ΔId _j ′. By performing this process in each inverter device A, the compensation value ΔId _i ′ of each inverter device A converges to the same value. It has been mathematically proved that the value of the state to be controlled converges to the same value by using the consensus algorithm (see Non-Patent Documents 1 and 2). In the case of the present embodiment, the compensation value ΔId _i ′ is the value of the state to be controlled.

  Hereinafter, in the power system illustrated in FIG. 2, a description will be given of a simulation in which each inverter device A confirms that the fluctuation of the interconnection point voltage is suppressed by suppressing output active power in cooperation. A simulation was performed using the control system shown in FIG.

The proportional gain Kp ₁ of the connection point voltage control unit 32 of the inverter device A1 is “0.5”, the integral gain Ki ₁ is “6”, and the proportional gain Kp ₂ of the connection point voltage control unit 32 of the inverter device A2 is “ 1 ”, the integral gain Ki ₂ is“ 10 ”, the proportional gain Kp ₃ of the interconnection point voltage control unit 32 of the inverter device A3 is“ 0.5 ”, the integral gain Ki ₃ is“ 3 ”, and the interconnection of the inverter device A4 The proportional gain Kp ₄ of the point voltage control unit 32 is set to “0.6”, the integral gain Ki _{4 is set} to “7”, the interconnection point voltage V is set to “1 [pu]”, and the line impedance resistance of the transmission line The component R is “0.06 [pu]”. 8 to 10 show the results of the simulation.

8 and 9, which the weighting value W ₁ to _W-4, which is set in the weighting unit 38 of the inverter device Al to A4, and the _{W 1 = W 2 = W 3} = W 4 = 1, each This is for confirming that the inverter device A cooperates to suppress the output active power. FIG. 8 is for comparison, and shows the case without cooperation (that is, when the control system shown in FIG. 4 is used), and FIG. 9 shows the case with cooperation (that is, shown in FIG. 6). (When using a control system).

  In both cases, the disturbance ΔPw is 0.1 [p. u. ] Was step-injected. FIG. 8A and FIG. 9A show the time change of the interconnection point voltage deviation ΔV. Moreover, FIG.8 (b) and FIG.9 (b) have shown the time change of the suppression amount of the output active power of each inverter apparatus A1-A4. In the figure, since the case where the output active power is increased is positive, the suppression amount is shown as a negative value.

  In the case of FIG. 8, although the fluctuation | variation of a connection point voltage can be suppressed immediately, the suppression amount of each inverter apparatus A1-A4 is being fixed to the value according to each gain. Therefore, the suppression amount of each inverter device A1 to A4 cannot be controlled. In the case of FIG.8 (b), the output active power of inverter apparatus A2 is suppressed most, and this suppression amount cannot be made small.

  In the case of FIG. 9 as well, as in the case of FIG. 8, the fluctuation of the interconnection point voltage can be immediately suppressed. In the case of FIG. 9, the suppression amount of each of the inverter devices A1 to A4 converges to the same value in about 8 seconds from the start of the simulation. That is, the inverter devices A1 to A4 cooperate to suppress the output active power.

  A simulation was also performed for each of the cases where the communication state of the power system of FIG. 2 is the graphs shown in FIGS. 5B and 5C. In these cases as well as in the case of FIG. 9, it was possible to immediately suppress the fluctuation of the interconnection point voltage, and it was confirmed that the suppression amounts of the inverter devices A1 to A4 converge to the same value. Further, in the case of the graph of FIG. 5B, the time until convergence is shorter than in the case of FIG. 9 (in the case of the graph of FIG. 5A), and in the case of the graph of FIG. The time to convergence has become even shorter. The simulation results are not shown.

In FIG. 10, the weighting values W _{1 to} W ₄ set in the weighting unit 38 of the inverter devices A1 to A4 are set to W ₂ = W ₃ = W ₄ = 1, and W ₁ is changed with time. This is for confirming that the amount of suppression of the output active power of each inverter device A varies depending on the weighting value. Also in the case of FIG. 10, the disturbance ΔPw is 0.1 [p. u. ] Was step-injected. FIG. 10A shows the time change of the interconnection point voltage deviation ΔV, and FIG. 10B shows the time change of the suppression amount of the output active power of each inverter device A1 to A4. The weighting value W ₁ is set to “1” at the start of the simulation, but is changed to “2” after 15 seconds from the start of the simulation, and is changed to “4” after 30 seconds.

As shown in FIG. 10, the fluctuation of the interconnection point voltage can be immediately suppressed, and the suppression amount of each of the inverter devices A1 to A4 converges to the same value in about 8 seconds from the start of the simulation. Further, after the weight value W ₁ is changed to “2”, the suppression amount of the inverter devices A2 to A4 is small (the value in FIG. 10B is large), and the suppression amount of the inverter device A1 is large (FIG. 10 (b) is small). That is, the inverter device A1 comes to bear a part of the suppression amount of the inverter devices A2 to A4. The suppression amount of the inverter devices A2 to A4 is half of the suppression amount of the inverter device A1. Further, after the weight value W ₁ is changed to “4”, the suppression amount of the inverter devices A2 to A4 is one-fourth of the suppression amount of the inverter device A1. Thus, it has been confirmed that the amount of suppression of the output active power of each inverter device A varies depending on the weighting value.

According to the present embodiment, the cooperative correction value generation unit 33 generates a cooperative correction value using a calculation result based on the compensation value ΔId _i ′ and the compensation value ΔId _j ′. When the cooperative correction value generation unit 33 of each inverter device A1 to A4 performs this, the compensation value ΔId _i ′ of all the inverter devices A1 to A4 converges to the same value. Therefore, the correction compensation values ΔId _i ^* of the inverter devices A1 to A4 are values corresponding to the respective weighting values W _{1 to} W ₄ . Since the amount of suppression of the output active power of each inverter device A1 to A4 is adjusted based on the correction compensation value ΔId _i ^* , the amount of suppression of the output active power of each inverter device A1 to A4 is set to the weighting values W _{1 to} W _4. Can be adjusted according to.

  In addition, each inverter device A connected to the power system performs mutual communication only with at least one inverter device A (for example, a device that is located in the vicinity or that has established communication), and the power system It is only necessary that the connected state is established, and it is not necessary for one inverter device A or the monitoring device to communicate with all other inverter devices A. Therefore, the system does not become a big deal. Moreover, even when a certain inverter device A fails or when a certain inverter device A is reduced, all the other inverter devices A can communicate with any one of the inverter devices A, and the power system is in a connected state. Good. Further, when the number of inverter devices A is increased, it is only necessary that the inverter device A performs mutual communication with at least one inverter device A. Therefore, the increase / decrease in the inverter device A can be flexibly dealt with.

  In the first embodiment, the case where the inverter device A converts the input from the DC power source 1 and outputs it to the power system B has been described, but the present invention is not limited to this. For example, the inverter device A may be an inverter device for charging / discharging a storage battery, or may be an inverter device for a load capable of adjusting power. Even in these cases, active power can be suppressed in cooperation with other inverter devices A.

  In the above description, the case where the connection point voltage is increased has been described. However, the connection point voltage may be decreased. When each inverter device A is performing MPPT control, since the output active power is controlled to be maximized, the output active power cannot be further increased in order to increase the interconnection voltage. In order to be able to cope with a decrease in interconnection point voltage, the output active power may be controlled to about 90% of the maximum value instead of the MPPT control. Or, when the connection point voltage drops, switch to perform communication only with the inverter device (storage battery or load inverter device) that can increase the output active power, and the active power is coordinated only between them. It is sufficient to make the increase of.

In the first embodiment, the case where the arithmetic expression set in the arithmetic unit 331 is the expression (5) has been described, but the present invention is not limited to this. Another equation for converging the compensation value ΔId _i ′ of the inverter devices A1 to A4 to the same value may be used.

For example, the compensation value ΔId _i ′ can be converged to the same value even when the arithmetic expression set in the arithmetic unit 331 is the following expression (7). d _i is the number of other inverter devices A with which the communication unit 39 communicates, that is, the number of compensation values ΔId _j ′ input to the communication unit 39.

Further, even when the calculation formulas set in the calculation unit 331 are the following formulas (8) to (10), the compensation value ΔId _i ′ can be converged to the same value.

  In the said 1st Embodiment, although the case where the fixed value was preset as a weighting value of each inverter apparatus A was demonstrated, it is not restricted to this. The weighting value of each inverter device A may be changeable.

FIG. 11 is a diagram for explaining an inverter device A according to the second embodiment. In FIG. 11, only the control circuit 3 is shown, and the description of the control circuit 3 that is common to the control circuit 3 according to the first embodiment (see FIG. 1) is omitted. The inverter device A according to the second embodiment differs from the inverter device A according to the first embodiment in that the weighting value _Wi is changed according to the temperature of the inverter circuit 2. As shown in FIG. 11, the inverter device A according to the second embodiment further includes a temperature detection unit 40 and a weight value setting unit 41 in the control circuit 3.

Although not shown, a temperature sensor is attached to the heat sink of the inverter circuit 2. The temperature detection unit 40 detects the temperature detected by the temperature sensor, and outputs the detected temperature to the weight value setting unit 41. The weight value setting unit 41 sets the weight value W _i corresponding to the temperature input from the temperature detection unit 40 in the weight unit 38. When the temperature of the inverter circuit 2 is high, it is considered that the inverter circuit 2 is burdened. Therefore, it is better to reduce the effective load by reducing the output active power by increasing the suppression amount. Therefore, the weight value setting unit 41 increases the set weight value W _i as the temperature input from the temperature detection unit 40 increases. In the present embodiment, compared to a threshold value that sets the temperature input from the temperature detecting section 40 in advance, the temperature is changed to a large value weighting value W _i if the threshold is greater than. Incidentally, may be set a plurality of threshold values, the weighting value W _i may be stepwise changed. Further, a calculation formula for linearly calculating the weighted value W _i from the temperature input from the temperature detection unit 40 may be set, and the calculation result of the calculation formula may be set.

According to the second embodiment, when an excessive load is applied to the inverter circuit 2 of the inverter device A and the temperature of the inverter circuit 2 becomes high, the weighting value _Wi is changed to a large value. Thereby, the suppression amount of the output active power of the said inverter apparatus A becomes large, and the suppression amount of the output active power of the other inverter apparatus A becomes small by that much. Thereby, the output active power of the inverter device A is suppressed, and the burden is reduced. Also in the second embodiment, the same effects as in the first embodiment can be obtained.

FIG. 12 is a diagram for explaining an inverter device A according to the third embodiment. FIG. 12A shows only the control circuit 3 of the inverter device A according to the third embodiment, and the common part of the control circuit 3 with the control circuit 3 according to the first embodiment (see FIG. 1). Is omitted. The inverter device A according to the third embodiment is different from the inverter device A according to the first embodiment in that the weighting value _Wi is changed according to the date and time. As illustrated in FIG. 12A, the inverter device A according to the third embodiment further includes a clock unit 42 and a weight value setting unit 41 ′ in the control circuit 3.

  The clock unit 42 outputs the date and time (hereinafter collectively referred to as “date and time”) to the weight value setting unit 41 ′.

The weighting value setting unit 41 ′ sets the weighting value W _i corresponding to the date and time input from the clock unit 42 in the weighting unit 38. Since the position of the sun changes with time, the shadowed area such as a building changes with time. In addition, since the sun's orbit changes depending on the date (for example, the sun's orbit differs greatly between the summer solstice and the winter solstice), the shadowed area such as a building also changes depending on the date. When the solar cell panel connected to the inverter device A is shaded, the electric power generated by the solar cell panel is reduced. In this case, since it is desired to avoid further suppressing the output power of the inverter device A, it is desired to reduce the suppression amount. In this embodiment, by investigating the solar panel shadows such advance, the weighting value W _i of the inverter device A shadow takes solar panel is connected, to switch to a smaller value in the shadow takes time ing. Further, the weighting value W _i is made smaller as the shadowed area becomes larger. Specifically, the weight value setting unit 41 ′ stores the weight value W _i table shown in FIG. 12B in the memory, and sets the weight value W _i corresponding to the date and time input from the clock unit 42. Read and set. In FIG. 12B, since the shadow is applied to the solar cell panel from 9:00 to 12:00 in January, a smaller value than usual is set for this date and time. The weight value W _i may be changed only by time regardless of the date, or may be changed only by date regardless of the time.

According to the third embodiment, on the date and time when the solar cell panel connected to the inverter device A is shaded, the weighting value _Wi is changed to a smaller value, and the amount of suppression of the output active power is reduced. Thereby, when the electric power generated by the shadow becomes small, the suppression amount can be made small. In the third embodiment, the same effects as in the first embodiment can be obtained.

FIG. 13 is a diagram for explaining an inverter device A according to the fourth embodiment. In FIG. 13, the description of the common part of the control circuit 3 with the control circuit 3 according to the first embodiment (see FIG. 1) is omitted. The inverter device A according to the fourth embodiment is different from the inverter device A according to the first embodiment in that the weighting value _Wi is changed according to the output active power of the inverter circuit 2. As shown in FIG. 13, the inverter device A according to the fourth embodiment further includes an active power calculation unit 43 and a weight value setting unit 41 ″ in the control circuit 3.

  The active power calculation unit 43 calculates the output active power P of the inverter circuit 2, and the current signals Iu, Iv, Iw input from the current sensor 4 and the three-phase continuous signal input from the voltage sensor 5. The output active power P is calculated from the voltage signals Vu, Vv, Vw obtained by digitally converting the instantaneous value of the system point voltage. The active power calculation unit 43 outputs the calculated output active power P to the weighting value setting unit 41 ″.

Weighting value setting unit 41 "when setting the weighting value W _i corresponding to the output effective power P input from the effective power calculator 43 to the weighting section 38. Output active power P is large, the capacity of the inverter apparatus A In the present embodiment, the output active power is reduced by increasing the suppression amount. In other words, the weight value setting unit 41 ″ is input from the active power calculation unit 43. It is compared with the threshold value that sets the output effective power P in advance, the output effective power P is changed to a large value weighting value W _i if the threshold is greater than. Incidentally, may be set a plurality of threshold values, the weighting value W _i may be stepwise changed. Alternatively, a calculation formula for linearly calculating the weighted received value W _i from the output active power P may be set, and a calculation result of the calculation formula may be set.

According to the fourth embodiment, when the output active power P of the inverter device A is large, the weighting value _Wi is changed to a large value. Thereby, the suppression amount of the output active power of the said inverter apparatus A becomes large, and output active power is suppressed. Moreover, also in 4th Embodiment, there can exist an effect similar to 1st Embodiment.

Incidentally, it is also possible to change the weighting value W _i by the generator of the DC power source 1. Further, when the DC power source 1 is a solar cell, the weighting value W _i is determined by the amount of solar radiation, and when the DC power source 1 is an apparatus that converts AC power generated by a wind turbine generator or the like into DC power and outputs it, the weight value W _i May be changed. Further, it is also possible to change the weighting value W _i in accordance with the power sale price.

  The control circuit, inverter device, power system, and control method according to the present invention are not limited to the above-described embodiments. The specific configuration of each part of the control circuit, the inverter device, the power system, and the control method according to the present invention can be varied in design in various ways.

A, A1 to A4 Inverter device 1 DC power supply 2 Inverter circuit 3 Control circuit 30 Reactive power control unit 31 Input voltage control unit 32 Linkage point voltage control unit 33 Cooperative correction value generation unit 331 Calculation unit 332 Multiplier 333 Integrator 34 Addition 35 Current control unit 351 Three-phase / two-phase conversion unit 352 Rotational coordinate conversion unit 353, 354 Low-pass filter 355, 356 PI control unit 357 Stationary coordinate conversion unit 358 Two-phase / three-phase conversion unit 36 Command signal generation unit 37 PWM signal Generation unit 38 Weighting unit 39 Communication unit 40 Temperature detection unit 41, 41 ', 41 "Weight value setting unit 42 Clock unit 43 Active power calculation unit 4 Current sensor 5 Voltage sensor 6 DC voltage sensor B Power system

Claims (13)

In a power system in which a plurality of inverter devices that are not in a master-slave relationship are connected in parallel, a control circuit that controls an inverter circuit included in each inverter device,
Input voltage control means for generating an active power compensation value for controlling the voltage input to the inverter device;
A connection point voltage control means for generating a compensation value for controlling the connection point voltage to a target value;
Cooperative correction value generation means for generating a correction value for cooperation with each of the inverter devices;
Adding means for calculating a correction compensation value by adding the correction value to the compensation value;
PWM signal generating means for generating a PWM signal based on a value obtained by subtracting the correction compensation value from the active power compensation value;
Weighting means for weighting the correction compensation value;
Communication means for communicating with at least one other inverter device;
With
The communication means transmits a weighted correction compensation value to the other inverter device,
The cooperative correction value generation means generates the correction value using a calculation result based on the weighted correction compensation value and the reception compensation value received by the communication means from the other inverter device.
A control circuit characterized by that. The cooperative correction value generating means
A calculation means for performing a calculation based on the weighted correction compensation value and the reception compensation value;
Integrating means for calculating the correction value by integrating the calculation result output by the calculating means;
The control circuit according to claim 1, comprising: The calculation means subtracts the weighted correction compensation value from the reception compensation value, and calculates the calculation result by adding all the subtraction results.
The control circuit according to claim 2. The arithmetic means subtracts the weighted correction compensation value from the reception compensation value, adds all the subtraction results, and divides by the number of other inverter devices with which the communication means is communicating. , Calculate the calculation result,
The control circuit according to claim 2. The calculating means subtracts the weighted correction compensation value from the reception compensation value, adds all the subtraction results, and multiplies the weighted correction compensation value to calculate the calculation result.
The control circuit according to claim 2. The calculation means calculates the calculation result by subtracting the reception compensation value from the weighted correction compensation value, adding all the subtraction results, and multiplying by the square of the weighted correction compensation value. To
The control circuit according to claim 2. The weighting unit performs weighting by dividing the correction compensation value by a preset weighting value.
The control circuit according to claim 1. Temperature detecting means for detecting the temperature of the inverter circuit;
Weighting value setting means for setting a weighting value corresponding to the temperature;
Further comprising
The weighting unit performs weighting by dividing the correction compensation value by a weighting value set by the weighting value setting unit.
The control circuit according to claim 1. Clock means for outputting the date or time;
A weighting value setting means for storing a weighting value in association with the date or time, and for setting a weighting value corresponding to the date or time output by the clock means;
Further comprising
The weighting unit performs weighting by dividing the correction compensation value by a weighting value set by the weighting value setting unit.
The control circuit according to claim 1. Active power calculating means for calculating output active power of the inverter circuit;
Weighting value setting means for setting a weighting value corresponding to the output active power;
Further comprising
The weighting unit performs weighting by dividing the correction compensation value by a weighting value set by the weighting value setting unit.
The control circuit according to claim 1.   An inverter device comprising the control circuit according to claim 1 and an inverter circuit.   A power system, wherein a plurality of the inverter devices according to claim 11 are connected in parallel. In a power system in which a plurality of inverter devices that are not in a master-slave relationship are connected in parallel, a control method for controlling the inverter circuit of each inverter device,
A first step of generating an active power compensation value for controlling a voltage input to the inverter device;
A second step of generating a compensation value for controlling the interconnection point voltage to a target value;
A third step of generating a correction value for cooperating with each inverter device;
A fourth step of calculating a correction compensation value by adding the correction value to the compensation value;
A fifth step of generating a PWM signal based on subtracting the correction compensation value from the active power compensation value;
A sixth step of weighting the correction compensation value;
A seventh step of transmitting the weighted correction compensation value to at least one other inverter device;
An eighth step of receiving a value transmitted by the other inverter device as a reception compensation value;
Is performed by each inverter device,
The third step generates the correction value using a calculation result based on the weighted correction compensation value and the reception compensation value received in the eighth step.
A control method characterized by that.