Control method of inverter circuit, power conversion device, energy storage device and computer readable storage medium

Abstract

The invention provides a control method of an inverter circuit, power conversion equipment, energy storage equipment and a computer readable storage medium. The control method of the inverter circuit comprises the following steps: acquiring an output active power value of the inverter circuit and an output current value of the inverter circuit; obtaining a voltage compensation value according to the output active power value and the output current value; obtaining a target output voltage value according to the voltage compensation value and a reference output voltage value of the inverter circuit; and generating a control signal according to the target output voltage value, wherein the control signal is used for controlling the inverter circuit to adjust the output voltage value of the inverter circuit. According to the control method of the inverter circuit provided by the invention, constant-power discharge of the inverter circuit can be realized.

Description

Technical Field

[0001] The present application relates to the field of power electronic control technology, and in particular to a control method for an inverter circuit, a power conversion device, an energy storage device, and a computer-readable storage medium. Background Art

[0002] When the AC output port of the inverter circuit is connected to an AC load, the inverter circuit will output an AC voltage with a rated voltage and a rated frequency for use by the AC load. When the output current of the AC output interface of the inverter circuit is greater than or less than the rated current, the related art often uses a method of gradually reducing the output voltage or gradually increasing the output voltage to achieve constant power discharge. In this way, the output voltage is always in a fluctuating state, causing the output power to fluctuate severely. Therefore, there is an urgent need for an inverter circuit control method to keep the output voltage and output power in a relatively stable state to achieve constant power discharge. Summary of the invention

[0003] In view of this, the present application provides a control method of an inverter circuit, a power conversion device, an energy storage device and a computer-readable storage medium, so that the output voltage and the output power are in a relatively stable state to achieve constant power discharge.

[0004] The first aspect of the present application provides a control method for an inverter circuit, comprising: obtaining an output active power value of the inverter circuit and an output current value of the inverter circuit; obtaining a voltage compensation value according to the output active power value and the output current value; obtaining a target output voltage value according to the voltage compensation value and a reference output voltage value of the inverter circuit; and generating a control signal according to the target output voltage value, the control signal being used to control the inverter circuit to adjust the output voltage value of the inverter circuit.

[0005] In one embodiment, the output active power value of the inverter circuit and the output current value of the inverter circuit are obtained, including: within a preset period, obtaining the instantaneous value of the output voltage and the instantaneous value of the output current of the inverter circuit at each sampling moment; according to the instantaneous value of the output voltage and the instantaneous value of the output current of the inverter circuit at each sampling moment, obtaining the output active power value of the inverter circuit and the output current value of the inverter circuit.

[0006] In one embodiment, a voltage compensation value is obtained according to an output active power value and an output current value, including: obtaining a rated output power value and a given current value of an inverter circuit; obtaining a first voltage compensation value according to the output active power value and the rated output power value; obtaining a second voltage compensation value according to the output current value and the given current value; and obtaining a voltage compensation value according to the first voltage compensation value and the second voltage compensation value.

[0007] In one embodiment, obtaining a first voltage compensation value according to an output active power value and a rated output power value includes: subtracting the output active power value from the rated output power value to obtain a power deviation value; and performing deviation adjustment on the power deviation value to obtain the first voltage compensation value.

[0008] In one embodiment, obtaining the second voltage compensation value according to the output current effective value and the given current effective value includes: subtracting the output current value from the given current value to obtain a current deviation value; and performing deviation adjustment on the current deviation value to obtain the second voltage compensation value.

[0009] In one embodiment, obtaining the voltage compensation value according to the first voltage compensation value and the second voltage compensation value includes: selecting a smaller value of the first voltage compensation value and the second voltage compensation value as the voltage compensation value.

[0010] In one embodiment, obtaining the target output voltage value according to the voltage compensation value and the reference output voltage value of the inverter circuit includes: taking the sum of the voltage compensation value and the reference output voltage value as the target output voltage value.

[0011] A second aspect of the present application provides a power conversion device, including an inverter circuit, an AC output interface and a control device, wherein the output end of the inverter circuit is connected to the AC output interface, the control device is connected to the inverter circuit, and the control device includes a processor and a memory, the memory is used to store a computer program, and the processor is used to execute the computer program and implement the control method of the inverter circuit as described in any of the above items when executing the computer program.

[0012] The third aspect of the present application provides an energy storage device, including a battery module, an inverter circuit, an AC output interface and a control device, wherein the battery module is used to provide power input to the input end of the inverter circuit, the output end of the inverter circuit is connected to the AC output interface, the control device is connected to the inverter circuit, and the control device includes a processor and a memory, the memory is used to store a computer program, the processor is used to execute the computer program and, when executing the computer program, implements the control method of the inverter circuit as described in any of the above items.

[0013] A fourth aspect of the present application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, enables the processor to implement a control method for an inverter circuit as described in any one of the above items.

[0014] In summary, the control method of the inverter circuit provided by the present application first obtains the output active power value and the output current value of the inverter circuit, so as to determine the control amount for adjusting the output voltage value, that is, the voltage compensation value, through the output active power value and the output current value. Then, the target output voltage value is obtained according to the voltage compensation value and the reference output voltage value, and a control signal is generated according to the target output voltage value to control the inverter circuit to adjust the output voltage value of the inverter circuit. Among them, when the output active power value is greater than the given active power value or the output current value is greater than the given current value, the voltage compensation value is a negative value, so that the adjusted output voltage value drops to a target output voltage value less than the reference output voltage value; when the output active power value is less than the given active power value or the output current value is less than the given current value, the voltage compensation value is a positive value, so that the adjusted output voltage value rises to a target output voltage value greater than the reference output voltage value, and because under the premise that the load remains unchanged, the output current value is positively correlated with the output voltage value, and under the premise that the power factor is a positive value, the output voltage value is positively correlated with the output active power value, therefore, the output active power value and the output current value rise with the increase of the output voltage value, and fall with the decrease. In this way, by adjusting the output voltage value, the output voltage value, the output active power value and the output current value can be quickly in a stable state, thereby realizing the constant power discharge of the inverter circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope of protection of the present application. In each of the drawings, similar components are numbered similarly.

[0016] Figure 1 A schematic diagram of an application environment of an inverter circuit provided in an embodiment of the present application.

[0017] Figure 2 is a circuit diagram of an inverter circuit in one embodiment of the present application.

[0018] Figure 3 A flowchart of a control method for an inverter circuit provided in an embodiment of the present application.

[0019] Figure 4 Schematic diagram of the flow of sub-steps of step S301 in one embodiment of the present application.

[0020] Figure 5 Schematic diagram of the flow of sub-steps of step S302 in one embodiment of the present application.

[0021] Figure 6 Schematic diagram of the flow of sub-steps of step S502 in an embodiment of the present application.

[0022] Figure 7 Schematic diagram of the flow of sub-steps of step S503 in an embodiment of the present application.

[0023] Figure 8 In one embodiment of the present application, an active power loop is selected to participate in the output voltage value adjustment and when the output active power value of the inverter circuit exceeds the rated output power value, the output voltage value change curve is shown.

[0024] Fig. 9 In one embodiment of the present application, a current loop is selected to participate in the output voltage value adjustment and when the output current value of the inverter circuit exceeds a given current value, the output voltage value change curve is shown.

[0025] Fig.10 A specific control block diagram of a control method for an inverter circuit provided in one embodiment of the present application.

[0026] Fig.11 The figure is a schematic diagram of an output power curve of an inverter circuit obtained when the output voltage is gradually adjusted according to the prior art.

[0027] Fig.12 The figure is a schematic diagram of an output power curve obtained by modulating an inverter circuit according to the control method of an inverter circuit provided in the present application.

[0028] Fig.13 This is a structural block diagram of a power conversion device provided in one embodiment of the present application.

[0029] Fig.14 A structural block diagram of an energy storage device provided in one embodiment of the present application.

[0030] Fig.15 This is a structural block diagram of a control device provided in one embodiment of the present application.

[0031] Fig.16 A functional block diagram of a computer-readable storage medium provided for one embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0033] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] Some embodiments will be described below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0036] See also Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the application environment of the inverter circuit 10. Figure 1 As shown, the inverter circuit 10 is connected to the DC power source 20 via a DC bus (including a positive DC bus BUS+ and a negative DC bus BUS-). The output end of the inverter circuit 10 (including a positive output terminal OUT+ and a negative output terminal OUT-) is connected to a load 30.

[0037] The DC power supply 20 may be a battery module, an energy storage device, or other electronic device for outputting DC power, and the present application does not limit the DC power supply 20. The load 30 may be an AC load having an excitation coil or winding, such as a motor or a transformer. The inverter circuit 10 is used to convert the DC power output by the DC power supply 20 into AC power to supply power to the load 30.

[0038] Understandably, in some embodiments, the inverter circuit 10 can also supply power to the load 30 after passing through a transformer, and the present application does not limit this. In some embodiments, the inverter circuit 10 and the DC power supply 20 can be integrated into the same device to form an energy storage device. In other embodiments, the inverter circuit 10 can be integrated with other voltage conversion circuits such as a DC conversion circuit in a device to form a power converter, and the DC power supply 20 can be connected to the DC bus through the DC interface of the power converter.

[0039] Please continue reading Figure 2Specifically, in one embodiment, the inverter circuit 10 includes a switch tube Q1, a switch tube Q2, a switch tube Q3, a switch tube Q4, an inductor L1, a capacitor C1 and a capacitor C2. Among them, the first end of the switch tube Q1 and the first end of the switch tube Q3 are both electrically connected to the positive DC bus BUS+. The second end of the switch tube Q1 is electrically connected to the first end of the switch tube Q2. The second end of the switch tube Q3 is electrically connected to the first end of the switch tube Q4. The second end of the switch tube Q2 and the second end of the switch tube Q4 are both electrically connected to the negative DC bus BUS-. The controlled ends of the switch tubes Q1, Q2, Q3 and Q4 are all electrically connected to the controller (not shown). The first end of the inductor L1 is electrically connected between the second end of the switch tube Q1 and the first end of the switch tube Q2, and the second end of the inductor L1 is electrically connected to the positive output terminal OUT+ of the inverter circuit 10. The negative output terminal OUT- of the inverter circuit 10 is electrically connected between the second end of the switch tube Q3 and the first end of the switch tube Q4. The capacitor C1 is connected between the positive output terminal OUT+ and the negative output terminal OUT- of the inverter circuit 10. The capacitor C2 is connected between the positive DC bus BUS+ and the negative DC bus BUS-.

[0040] It is understandable that the present application does not limit the specific circuit structure of the inverter circuit. Figure 1 Only a single-phase full-bridge inverter circuit is used as an example for description. In other embodiments, the inverter circuit 10 may also be other inverter circuits, such as a half-bridge inverter circuit, a multi-phase inverter circuit, etc. Correspondingly, when the inverter circuit 10 is a single-phase inverter circuit, the inverter circuit 10 can output single-phase alternating current; when the inverter circuit 10 is a multi-phase inverter circuit, the inverter circuit 10 can output multi-phase alternating current. This application will be described later using a single-phase inverter circuit as an example.

[0041] Furthermore, when the output end of the inverter circuit is connected to an AC load, the inverter circuit will output an AC voltage of rated voltage and rated frequency for use by the AC load. When the output current of the AC output interface of the inverter circuit is greater than or less than the rated current, the related art often uses a method of gradually reducing the output voltage or gradually increasing the output voltage to achieve constant power discharge. In this way, the output voltage is always in a fluctuating state, causing the output power to fluctuate severely. Therefore, there is an urgent need for an inverter circuit control method to keep the output voltage and output power in a relatively stable state to achieve constant power discharge.

[0042] To this end, the present application provides a control method for an inverter circuit to keep the output voltage and output power in a relatively stable state to achieve constant power discharge.

[0043] See also Figure 3 , Figure 3A flow chart of a control method for an inverter circuit provided in an embodiment of the present application. The control method can be applied to a controller (not shown) for controlling the inverter circuit 10. The control method includes:

[0044] Step S301: Acquire the output active power value of the inverter circuit and the output current value of the inverter circuit.

[0045] In the present application, when the output end of the inverter circuit 10 is connected to the load 30 , the inverter circuit 10 can output alternating current to power the load 30 , so that the load 30 works.

[0046] The output active power value can be obtained according to the instantaneous value of the output power of the inverter circuit. The output current value can be obtained according to the instantaneous value of the output current of the inverter circuit. For example, the output current value can be the instantaneous value of the output current after filtering, or the output current value can be the effective value of the output current calculated according to the instantaneous value of the output current, etc.

[0047] Step S302: Obtain a voltage compensation value according to the output active power value and the output current value.

[0048] Understandably, by comparing the obtained output active power value with the preset given active power value, it can be determined whether the output active power of the inverter circuit 10 meets the power demand of the load 30 or meets the safety requirements. By comparing the output current value with the preset given current value, it can be determined whether the output end of the inverter circuit 10 is overcurrent. Moreover, according to the output active power value and the given active power value, the output current value and the given current value can determine the control amount for adjusting the output voltage value, that is, the voltage compensation value, so that the output active power value is close to the given active power value and / or the output current value is close to the given current value by adjusting the output voltage value.

[0049] Step S303: Obtaining a target output voltage value according to the voltage compensation value and a reference output voltage value of the inverter circuit.

[0050] The voltage compensation value is used to characterize the change in the reference output voltage value, and the voltage compensation value is positively correlated with the target output voltage value.

[0051] The reference output voltage value is used to characterize the base value of the output voltage value. For example, in some embodiments, the reference output voltage value may be less than the rated output voltage value of the inverter circuit 10 , and the reference output voltage value may be greater than the minimum output voltage value of the inverter circuit 10 .

[0052] The target output voltage value is less than or equal to the rated output voltage value of the inverter circuit 10 , and the target output voltage value is greater than or equal to the minimum voltage value of the inverter circuit 10 .

[0053] Understandably, when the output active power value is greater than the given active power value, the output active power value needs to be reduced. Under the premise that the power factor is a positive value, since the output voltage value is positively correlated with the output active power value, the output active power value can be reduced by reducing the output voltage value of the inverter circuit 10. In this way, the voltage compensation value needs to be a negative value at this time, so that the adjusted output voltage value drops to a target output voltage value that is less than the reference output voltage value. Similarly, when the output active power value is less than the rated output power value, the voltage compensation value needs to be a positive value, so that the adjusted output voltage value is increased to a target output voltage value that is greater than the reference output voltage value, so as to increase the output active power value by increasing the output voltage value. In this way, the output active power value increases with the increase of the output voltage value, and decreases with the decrease. In this way, after adjustment, the output active power value of the inverter circuit 10 can be close to or equal to the rated output power, so that the output active power value is finally in a stable state. At this time, the output voltage value of the inverter circuit 10 is also in a stable state, thereby achieving constant power discharge while reducing the jitter of the output power value and the output voltage value.

[0054] Similarly, when the output current value is greater than the given current value, the output current value needs to be reduced. Since the output voltage value of the inverter circuit 10 is positively correlated with the output current value under the premise that the load 30 remains unchanged, the output current value can be reduced by reducing the output voltage value. In this way, the voltage compensation value needs to be a negative value at this time, so that the adjusted output voltage value drops to a target output voltage value less than the reference output voltage value. Similarly, when the output current value is less than the given current value, the output current value needs to be increased, and the voltage compensation value needs to be a positive value at this time, so that the adjusted output voltage value is increased to a target output voltage value greater than the reference output voltage value. In this way, the output current value rises with the increase of the output voltage value, and decreases with the decrease. In this way, after adjustment, the output current value of the inverter circuit 10 can be close to or equal to the given current value, and is in a stable state. At the same time, the output voltage value is also in a stable state, and the output active power value is also in a stable state, that is, the output power value of the inverter circuit is in a stable state, thereby reducing the jitter of the output power value and the output voltage value while achieving constant power discharge.

[0055] Step S304: generating a control signal according to the target output voltage value, wherein the control signal is used to control the inverter circuit to adjust the output voltage value of the inverter circuit.

[0056] The control signal may be a driving signal for driving the switch tube on the inverter circuit 10, for example, a PWM (Pulse Width Modulation) signal for driving the switch tubes in the first bridge arm 110 and the second bridge arm 120. Understandably, under the control of the control signal, the output voltage of the inverter circuit 10 can be gradually approached to the target output voltage value.

[0057] Exemplarily, in step S304, the target duty cycle is obtained by dividing the target output voltage value by the bus voltage (i.e., the voltage across capacitor C2). Figure 2 The control signal including the target duty cycle is modulated by the first bridge arm 110 and the target duty cycle (not shown). Exemplarily, in the positive half cycle, the switch tube Q1 in the first bridge arm 110 and the switch tube Q4 in the second bridge arm 120 are respectively switched and modulated according to the corresponding control signals, and in the negative half cycle, the switch tube Q2 in the first bridge arm 110 and the switch tube Q3 in the second bridge arm 120 are respectively switched and modulated according to the corresponding control signals. In this way, the inverter circuit 10 works according to the control signal and can adjust the output voltage so that the output voltage is close to the target output voltage value.

[0058] In summary, the control method of the inverter circuit provided by the present application first obtains the output active power value and the output current value of the inverter circuit 10, so as to determine the control amount for adjusting the output voltage value, that is, the voltage compensation value, through the output active power value and the output current value. Then, the target output voltage value is obtained according to the voltage compensation value and the reference output voltage value, and a control signal is generated according to the target output voltage value to control the inverter circuit to adjust the output voltage value of the inverter circuit. Among them, when the output active power value is greater than the given active power value or the output current value is greater than the given current value, the voltage compensation value is a negative value, so that the adjusted output voltage value drops to a target output voltage value less than the reference output voltage value; when the output active power value is less than the given active power value or the output current value is less than the given current value, the voltage compensation value is a positive value, so that the adjusted output voltage value rises to a target output voltage value greater than the reference output voltage value, and because under the premise that the load 30 remains unchanged, the output current value is positively correlated with the output voltage value, and under the premise that the power factor is a positive value, the output voltage value is positively correlated with the output active power value, therefore, the output active power value and the output current value rise with the increase of the output voltage value, and fall with the decrease. In this way, by adjusting the output voltage value, the output voltage value, the output active power value and the output current value can be quickly in a stable state, thereby realizing the constant power discharge of the inverter circuit.

[0059] It is understandable that in some embodiments, the control method of the inverter circuit described above may be executed when it is detected that the output terminal of the inverter circuit 10 is connected to the load 30. The present application does not limit the specific load connection detection method.

[0060] See also Figure 4 In some embodiments, step S301 includes the following sub-steps:

[0061] Step S401: within a preset period, obtaining the instantaneous value of the output voltage and the instantaneous value of the output current of the inverter circuit at each sampling moment.

[0062] The preset period is a sampling period, and the preset period is a continuous preset duration. The preset period includes multiple sampling moments. It is understandable that the sampling period may not be synchronized with the operation period of the controller that executes the control method of the inverter circuit, and the present application does not limit the specific duration of the sampling period.

[0063] The output voltage instantaneous value may be the sampled voltage instantaneous value across the capacitor C1. The output current instantaneous value may be the sampled current instantaneous value flowing through the inductor L1. Multiple sets of output voltage instantaneous values ​​and multiple sets of output current instantaneous values ​​may be obtained in each preset period.

[0064] In some embodiments, the instantaneous value of the output current of the inverter circuit can be sampled in real time by a current sensor. For example, a sampling resistor is used as a current sensor, and the sampling resistor is connected in series with the inductor L1, and the voltage difference across the sampling resistor is measured. According to Ohm's law, the magnitude of the current is proportional to the voltage, so the magnitude of the instantaneous value of the output current can be calculated by the voltage difference across the sampling resistor. In other embodiments, other hardware or circuits with current detection functions can be used to detect the instantaneous value of the output current of the inverter circuit, such as an electromagnetic current transformer, an electronic current transformer (such as a Hall sensor) or an optical fiber current sensor, etc., and this application does not limit this.

[0065] In some embodiments, the voltage value across the capacitor C1 may be obtained through a voltage sampling circuit or a voltage sensor as the instantaneous value of the output voltage.

[0066] Step S402: according to the instantaneous value of the output voltage and the instantaneous value of the output current of the inverter circuit at each sampling moment, the output active power value of the inverter circuit and the output current value of the inverter circuit are obtained.

[0067] In some embodiments, the output current value may be determined according to the instantaneous value of the output current based on the following formula (1).

[0068]

[0069] Wherein, i represents the output current value; in represents the instantaneous value of the output current obtained at the nth sampling moment; and n represents the number of instantaneous values ​​of the output current involved in calculating the output current value.

[0070] In some embodiments, a sliding average algorithm can be used to calculate the output current value. It can be understood that the basic principle of the sliding average algorithm is to sequentially obtain n sampled output current instantaneous values. If the obtained output current instantaneous values ​​are less than n, the average value of all current output current instantaneous values ​​is output; when the obtained output current instantaneous values ​​exceed n, the output current value is equal to the average value of the n output current instantaneous values ​​obtained later. The sliding average algorithm can effectively eliminate periodic interference and some irregular interference. The present application does not limit the specific value of n. For example, n can be equal to 3. In other embodiments, the average value of all output current instantaneous values ​​sampled within a preset period can also be directly obtained as the output current value.

[0071] It is understandable that in other embodiments, the instantaneous value of the output current may be processed based on other filtering algorithms to determine the output current value according to the instantaneous value of the output current.

[0072] In some embodiments, the output active power value may be obtained according to the instantaneous value of the output voltage and the instantaneous value of the output current based on the following formula (2).

[0073]

[0074] Among them, P 有 Indicates the output active power value; Un and in correspond to each other, which are the instantaneous value of the output voltage and the instantaneous value of the output current sampled at the same time.

[0075] Similarly, in some embodiments, the output active power value can be calculated based on a sliding average algorithm. In other embodiments, the output active power value can also be calculated based on all output current instantaneous values ​​and output voltage instantaneous values ​​sampled within a preset period. The specific calculation process is not repeated here.

[0076] Thus, in this embodiment, the output active power value and the output current value are calculated according to the instantaneous value of the output voltage and the instantaneous value of the output current, which can reduce interference and reduce errors.

[0077] See also Figure 5 In some embodiments, step S302 includes the following sub-steps:

[0078] Step S501: Acquire the rated output power value and given current value of the inverter circuit.

[0079] Among them, the rated output power value is the maximum output power of the inverter circuit 10 under normal conditions. The given current value can be the rated output current of the inverter circuit 10, and the given current value is less than the overload current threshold of the inverter circuit 10. In some embodiments, the given current value can be calculated based on the rated output power value. For example, the quotient obtained by dividing the rated output power value by the minimum output voltage of the inverter circuit 10 can be calculated as the given current value. This application does not limit the specific numerical values ​​of the rated output power value and the given current value.

[0080] In some embodiments, the rated output power value and the given current value may be preset values ​​stored in the controller or in a memory connected to the inverter circuit 10. In other embodiments, the rated output power value and the given current value may also be obtained through communication between the controller and a host computer (not shown in the figure), and the present application does not limit the specific method for obtaining the rated output power value and the given current value.

[0081] Step S502: Obtain a first voltage compensation value according to the output active power value and the rated output power value.

[0082] In some embodiments, a first voltage compensation value can be calculated based on an active power loop, with the output active power value as a feedback value and the rated output power value as a given value. The first voltage compensation value can be equal to 0, can be greater than 0, or can be less than 0. It can be understood that when there is a deviation between the output active power value and the rated output power value, the output active power value can be adjusted by adjusting the output voltage value so that the output active power value is close to the rated output power value. In this way, the first voltage compensation value obtained by the active power loop calculation is used to characterize the change value of the target output voltage value compared to the reference output voltage value when the output active power value is adjusted to the rated output power value.

[0083] Step S503: obtaining a second voltage compensation value according to the output current value and the given current value.

[0084] In some embodiments, the second voltage compensation value can be calculated based on the current loop, with the output current value as the feedback value and the given current value as the given value. The second voltage compensation value can be equal to 0, can be greater than 0, or can be less than 0. It can be understood that when there is a deviation between the output current value and the given current value, the output current value can be adjusted by adjusting the output voltage value so that the output current value is close to the given current value. In this way, the second voltage compensation value is used to characterize the change value of the target output voltage value compared to the reference output voltage value when the output current value is adjusted to the given current value.

[0085] Step S504: obtaining a voltage compensation value according to the first voltage compensation value and the second voltage compensation value.

[0086] In some embodiments, the first voltage compensation value or the second voltage compensation value can be determined as the final voltage compensation value according to the degree of deviation between the active power value and the given active power value (i.e., the rated output power value) and the degree of deviation between the output current value and the given current value. That is, the active power loop and the current loop are used to compete with each other to determine the voltage compensation value.

[0087] For example, when the output voltage value of the inverter circuit needs to be boosted, in order to reduce the degree of fluctuation, the output active power value used as a feedback value in the active power loop can be closer to a given active power value, that is, when the power factor at the output end of the inverter circuit 10 is higher, the active power loop is configured to preferentially participate in the adjustment of the current output voltage value, and at this time, the first voltage compensation value output by the active power loop is obtained as the final voltage compensation value; when the output current value used as a feedback value in the current loop is closer to a given current value, that is, when the power factor at the output end of the inverter circuit 10 is lower, the current loop is configured to preferentially participate in the adjustment of the current output voltage value, and at this time, the second voltage compensation value output by the current loop is obtained as the final voltage compensation value.

[0088] For another example, when the output voltage value of the inverter circuit needs to be reduced, in order to reduce the voltage as quickly as possible, when the output active power value as the feedback value in the active power loop deviates further from the given active power value, the active power loop is configured to preferentially participate in the adjustment of the current output voltage value, and the first voltage compensation value output by the active power loop is obtained as the final voltage compensation value; when the output current value as the feedback value in the current loop deviates further from the given current value, the current loop is configured to preferentially participate in the adjustment of the current output voltage value, and the second voltage compensation value output by the current loop is obtained as the final voltage compensation value. In this way, the output voltage value can be adjusted taking into account both the fluctuation degree of the output voltage value and the safety of electricity use.

[0089] It can be understood that the larger the absolute value of the first voltage compensation value is, the more the output active power value deviates from the rated output power value, and the smaller the absolute value of the first voltage compensation value is, the closer the output active power value is to the rated output power value. The larger the absolute value of the second voltage compensation value is, the more the output current value deviates from the given current value, and the smaller the absolute value of the second voltage compensation value is, the closer the output current value is to the given current value. In this way, in step S504, the voltage compensation value can be determined according to the magnitude relationship between the absolute value of the first voltage compensation value and the absolute value of the second voltage compensation value.

[0090] In summary, in this embodiment, the first voltage compensation value is calculated by the active power loop, and the second voltage compensation value is calculated by the current loop, and then the final voltage compensation value is determined according to the size relationship between the first voltage compensation value and the second voltage compensation value, which is beneficial to adjust the output voltage value by taking into account both the jitter degree of the output voltage value and the power safety of the inverter circuit 10.

[0091] It is understandable that the present application does not limit the specific control loops of the active power loop and the current loop.

[0092] See also Figure 6 In some embodiments, step S502 includes the following sub-steps:

[0093] Step S601: subtract the output active power value from the rated output power value to obtain a power deviation value.

[0094] The power deviation value is used to indicate the degree of deviation between the rated output power value and the output active power value. When there is a power deviation between the rated output power value and the output active power value, that is, when the power deviation value is not 0, it indicates that the output active power value needs to be corrected so that the output active power value is close to the rated output power value.

[0095] Step S602: performing deviation adjustment on the power deviation value to obtain a first voltage compensation value.

[0096] Since the output voltage value is positively correlated with the output active power value, the first voltage compensation value can be calculated according to the output active power value and the rated output power value, so as to adjust the output voltage value by the first voltage compensation value, thereby adjusting the output active power value.

[0097] In step S602, the power deviation value is subjected to deviation adjustment, that is, a first voltage compensation value is obtained by deviation adjustment according to the rated output power value and the output active power value at the current moment. The first voltage compensation value represents the voltage change of the corresponding output voltage value when the output active power value at the next moment is adjusted to the rated output power value. In other words, the first voltage compensation value is used to adjust the output voltage value so that the output active power value at the next moment is close to the rated output power value.

[0098] It is understandable that the algorithm applied for deviation regulation may be a PI regulation algorithm (proportional integral control), a PID regulation algorithm (Proportion Integration Differentiation control), etc., and of course may also be other regulation algorithms.

[0099] In this way, by executing step S601 to step S602 , the first voltage compensation value can be calculated.

[0100] See also Figure 7 In some embodiments, step S503 includes the following sub-steps:

[0101] Step S701: subtract the output current value from the given current value to obtain a current deviation value.

[0102] The current deviation value is used to indicate the degree of deviation between the given current value and the output current value. When there is a current deviation between the given current value and the output current value, that is, the current deviation value is not 0, it indicates that the output current value needs to be corrected so that the output current value is close to the given current value.

[0103] The current deviation value is used to indicate the degree of deviation between the given current value and the output current value.

[0104] Step S702: performing deviation adjustment on the current deviation value to obtain a second voltage compensation value.

[0105] Since the output voltage value and the current output value are positively correlated, the second voltage compensation value can be calculated according to the output current value and the given current value, so as to adjust the output voltage value by the second voltage compensation value, thereby adjusting the output current value.

[0106] In step S702, the current deviation value is subjected to deviation adjustment, that is, a second voltage compensation value is obtained by deviation adjustment according to a given current value and an output current value at the current moment. The second voltage compensation value represents the voltage change of the corresponding output voltage value when the output current value at the next moment is adjusted to the given current value. In other words, the second voltage compensation value is used to adjust the output voltage value so that the output current value at the next moment is close to the given current value.

[0107] It is understandable that the algorithm applied for deviation regulation may be a PI regulation algorithm (proportional integral control), a PID regulation algorithm (Proportion Integration Differentiation control), etc., and of course may also be other regulation algorithms.

[0108] In this way, by executing step S701 to step S702 , the second voltage compensation value can be calculated.

[0109] In some embodiments, step S504 includes:

[0110] A smaller value between the first voltage compensation value and the second voltage compensation value is selected as the voltage compensation value.

[0111] It is understandable that when the first voltage compensation value and / or the second voltage compensation value are negative values, the minimum value between the two values ​​can be selected to achieve a rapid reduction in the output voltage value. Figure 8 and Fig. 9 , Figure 8In order to select the active power loop to participate in the output voltage value adjustment and when the output active power value of the inverter circuit 10 exceeds the rated output power value, the output voltage value change curve of the inverter circuit 10 is as follows: Fig. 9 The current loop is selected to participate in the output voltage value adjustment and when the output current value of the inverter circuit 10 exceeds the given current value, the output voltage value of the inverter circuit 10 changes curve. Figure 8 It can be seen that the active power loop is selected to participate in the output voltage value adjustment and when the output active power value of the inverter circuit 10 exceeds the rated output power value, the output voltage value of the inverter circuit 10 drops from the rated output voltage value to the minimum voltage value. Fig. 9 It can be seen that the current loop is selected to participate in the output voltage value adjustment and when the output current value of the inverter circuit 10 exceeds the given current value, the output voltage value of the inverter circuit 10 also drops from the rated output voltage value to the minimum voltage value. In this way, the control method of the inverter circuit provided by the present application can effectively reduce the output voltage value of the inverter circuit.

[0112] Similarly, when the first voltage compensation value and the second voltage compensation value are both positive values, selecting the minimum value between the two can reduce the change in the output voltage value, thereby reducing the jitter degree of the output voltage value. In other words, the control method of the inverter circuit provided by the present application can also improve the output voltage value of the inverter circuit while reducing the jitter degree of the output voltage.

[0113] Thus, in this embodiment, by selecting the smaller value of the first voltage compensation value and the second voltage compensation value as the voltage compensation value, the output voltage value can be adjusted by taking into account both the jitter degree of the output voltage value and the power safety of the inverter circuit 10 .

[0114] In some embodiments, step S303 includes:

[0115] The sum of the voltage compensation value and the reference output voltage value is taken as the target output voltage value.

[0116] In order to maintain the normal power supply of the inverter circuit 10 to the load 30, the output voltage value of the inverter circuit 10 needs to be greater than or equal to the minimum voltage value. At the same time, in order to ensure the normal operation of the inverter circuit 10, the output voltage value needs to be less than the rated output voltage value. Therefore, in some embodiments, the initial target voltage value is also obtained according to the voltage compensation value and the reference output voltage value, and then the initial target voltage value is limited to obtain the target output voltage value. For example, the initial target voltage value can be the sum of the voltage compensation value and the reference output voltage value. The limiting processing of the initial target voltage value includes: when the initial target voltage value is greater than or equal to the minimum voltage value, and the initial target voltage value is less than or equal to the rated output voltage value, the initial target voltage value is used as the target output voltage value; when the initial target voltage value is less than the minimum voltage value, the minimum voltage value is used as the target output voltage value; when the initial target voltage value is greater than the rated output voltage value, the rated output voltage value is used as the target output voltage value. In this way, after the limiting processing, the target output voltage value finally determined can meet the load working requirements and meet the safety requirements.

[0117] It is understandable that in other embodiments, in step S303, the target output voltage value can be calculated based on the voltage compensation value and the reference output voltage value based on other methods. For example, voltage feedforward control can be added to calculate the third voltage compensation value based on the output voltage value at the current moment and the feedforward control coefficient, and then the sum of the voltage compensation value, the reference output voltage value and the third voltage compensation value is used as the target output voltage value. This application does not limit the specific calculation method for calculating the target output voltage value based on the voltage compensation value and the reference output voltage value in step S303.

[0118] See also Fig.10 , Fig.10 The following is a specific control block diagram of a control method for an inverter circuit provided by an embodiment of the present application implemented by an active power loop and a current loop. Fig.10 The specific working process of the control method of the inverter circuit is explained.

[0119] First, the power deviation value P_dev between the output active power value P_out_act of the inverter circuit 10 and the rated output power value P_rat is obtained according to the first adder 111. The power deviation value P_dev is deviation-adjusted by the first PID regulator 112 to obtain the first voltage compensation value U_com1. At the same time, the current deviation value I_dev between the output current value I_out of the inverter circuit 10 and the given current value I_ref is obtained according to the second adder 113. The current deviation value I_dev is deviation-adjusted by the second PID regulator 114 to obtain the second voltage compensation value U_com2. Then, the minimum value of the first voltage compensation value U_com1 and the second voltage compensation value U_com2 is selected as the voltage compensation value U_comf according to the minimum value selector 115. Then, based on the third adder 116, the target output voltage value U_aim is obtained according to the voltage compensation value U_comf and the output voltage reference value U_ref. The target output voltage value U_aim is then calculated by the calculator 117 and divided by the bus voltage U_bus to obtain the target duty cycle duty. Finally, the PWM modulator 118 generates a control signal according to the target duty cycle duty to control the inverter circuit to adjust the output voltage value so that the output voltage value is close to the target output voltage value U_aim, thereby adjusting the output active power value or the output current value synchronously by adjusting the output voltage value, and finally making the output voltage value and the output active power value of the inverter circuit reach a stable state, thereby reducing the jitter of the output active power value and the output voltage value while achieving constant power discharge.

[0120] Understandably, the first PID regulator 112 and the second PID regulator 114 are based on existing controllers in the related art, such as PID controllers (proportional integral differential controllers). In other embodiments, other controllers such as PI controllers (proportional integral controllers) and the like may also be used, and the present application does not limit this. Correspondingly, the deviation adjustment algorithm may also be a PID adjustment algorithm (Proportion Integration Differentiation control, proportional integral differential adjustment), a PI adjustment algorithm (proportional integral control, proportional integral adjustment), etc., and of course, other adjustment algorithms may also be used.

[0121] Understandably, Fig.10The control process of the control block diagram shown can be implemented by the control method of the inverter circuit provided in the present application, for example, by a computer program stored in a controller, and the specific implementation details are not repeated here.

[0122] Please continue reading Fig.11 and Fig.12 , Fig.11 is a schematic diagram of an output power curve of an inverter circuit obtained by gradually adjusting the output voltage according to the prior art, Fig.12 Schematic diagram of the output power curve obtained by modulating the inverter circuit 10 according to the control method of the inverter circuit provided by the present application. Fig.11 It can be seen that when the method of gradually adjusting the output voltage is adopted, the output power of the inverter circuit fluctuates severely. Fig.12 It can be seen that when the control method of the inverter circuit provided by the present application is adopted, the output power of the inverter circuit can be quickly restored to a stable state, for example Fig.12 The output power is stable at around 2000W. Fig.11 and Fig.12 It can be explained that the control method of the inverter circuit provided in the present application can make the output voltage value and the output power value in a relatively stable state, thereby achieving constant power discharge.

[0123] See also Fig.13 The present application also provides a power conversion device 100, including an inverter circuit 10, an AC output interface 40 and a control module 50. The output end of the inverter circuit 10 is connected to the AC output interface 40. The control module 50 is connected to the inverter circuit 10. The control module 50 includes a processor 510 and a memory 520. The memory 520 is used to store a computer program, and the processor 510 is used to execute the computer program and implement the inverter circuit control method described in any one of the above items when executing the computer program.

[0124] It is understandable that the connection between the output end of the inverter circuit 10 and the AC output interface 40 may be a direct connection or an indirect connection. For example, in some embodiments, when the output end of the inverter circuit 10 is directly connected to the AC output interface 40, there are no other components between the output end of the inverter circuit 10 and the AC output interface 40, and the AC power output by the inverter circuit 10 is the AC power output by the AC output interface 40.

[0125] For example, in other embodiments, when the output end of the inverter circuit 10 is indirectly connected to the AC output interface 40, other circuits may be arranged between the output end of the inverter circuit 10 and the AC output interface 40, such as a voltage conversion circuit, a filter circuit, an isolation circuit, etc.

[0126] It is understandable that, regardless of whether the output end of the inverter circuit 10 is connected to the AC output interface 40 by direct current or indirectly, the output voltage magnitude, frequency, and output current of the AC output interface 40 always change with the output voltage magnitude, frequency, and output current of the output end of the inverter circuit 10. Therefore, in any of the embodiments of the inverter circuit control method mentioned above, when the output current of the output end is replaced by the output current of the AC output interface 40 of the power conversion device 100, the control of the inverter circuit 10 in the power conversion device 100 can also be achieved.

[0127] The control module 50 is connected to the inverter circuit 10 , which may be an electrical connection or a wireless connection.

[0128] In summary, the power conversion device 100 provided by the present application first obtains the output active power value and the output current value of the inverter circuit 10, so as to determine the control amount for adjusting the output voltage value, that is, the voltage compensation value, through the output active power value and the output current value. Then, the target output voltage value is obtained according to the voltage compensation value and the reference output voltage value, and a control signal is generated according to the target output voltage value to control the inverter circuit to adjust the output voltage value of the inverter circuit. Among them, when the output active power value is greater than the given active power value or the output current value is greater than the given current value, the voltage compensation value is a negative value, so that the adjusted output voltage value drops to a target output voltage value less than the reference output voltage value; when the output active power value is less than the given active power value or the output current value is less than the given current value, the voltage compensation value is a positive value, so that the adjusted output voltage value rises to a target output voltage value greater than the reference output voltage value, and because under the premise that the load 30 remains unchanged, the output current value is positively correlated with the output voltage value, and under the premise that the power factor is a positive value, the output voltage value is positively correlated with the output active power value, therefore, the output active power value and the output current value rise with the increase of the output voltage value, and fall with the decrease. In this way, by adjusting the output voltage value, the output voltage value, the output active power value and the output current value can be quickly in a stable state, thereby realizing the constant power discharge of the inverter circuit.

[0129] Please continue reading Fig.14 , an embodiment of the present application also provides an energy storage device 200, including a battery module 60, an inverter circuit 10, an AC output interface 40 and a control module 50. Among them, the battery module 60 is used to provide power input to the input end of the inverter circuit 10. The output end of the inverter circuit 10 is connected to the AC output interface 40. The control module 50 is connected to the inverter circuit 10. The control module 50 includes a processor 510 and a memory 520. The memory 520 is used to store a computer program. The processor 510 is used to execute the computer program and implement the inverter circuit control method described in any of the above items when executing the computer program.

[0130] The battery module 60 includes at least one battery pack. The battery module 60 is chargeable to store electrical energy, and when the AC output interface 40 of the energy storage device 200 is connected to the load 30 , the battery module 60 converts DC power into AC power through the inverter circuit 10 to power the load 30 .

[0131] Understandably, in some embodiments, the energy storage device 200 may be a simple device capable of storing and converting electrical energy, in which case the load 30 connected to the energy storage device 200 may be another independent electronic device. In other embodiments, the energy storage device 200 may also be integrated into an electronic device with corresponding functions (such as an air conditioner, a refrigerator, etc.), in which case the load 30 may also be an electronic device inside the electronic device that needs to be driven by alternating current, such as a motor, etc. The present application does not limit the specific application scenarios of the energy storage device 200.

[0132] It is understandable that the output end of the inverter circuit 10 and the AC output interface 40 may be directly connected or indirectly connected, and the present application does not limit this.

[0133] In this way, the energy storage device 200 provided in the present application can also achieve constant power discharge of the inverter circuit 10 .

[0134] The embodiment of the present application also provides a control device applied to an inverter circuit or an electronic device integrated with an inverter circuit. Fig.15 The structure block diagram of the control device 300 provided in the embodiment of the present application is schematically shown. Fig.15 As shown, the control device 300 includes:

[0135] The acquisition module 310 is used to acquire the output active power value of the inverter circuit and the output current value of the inverter circuit.

[0136] The first calculation module 320 is used to obtain a voltage compensation value according to the output active power value and the output current value.

[0137] The second calculation module 330 is used to obtain a target output voltage value according to the voltage compensation value and a reference output voltage value of the inverter circuit.

[0138] The signal generating module 340 is used to generate a control signal according to the target output voltage value, and the control signal is used to control the inverter circuit to adjust the output voltage value of the inverter circuit.

[0139] The specific details of the control method for implementing the inverter circuit by the control device 300 provided in the embodiment of the present application have been described in detail in the embodiment of the corresponding inverter circuit control method, and will not be repeated here.

[0140] See also Fig.16The present application also provides a computer-readable storage medium 400 on which a computer program 410 is stored. When the computer program 410 is executed by a processor, the inverter circuit control method in the above technical solution is implemented. The computer-readable storage medium 400 can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device such as a personal computer. However, the program product of the present invention is not limited to this. In this document, the readable storage medium can be any tangible medium containing or storing a program, which can be used by or in combination with an instruction execution system, an apparatus or a device.

[0141] The above program product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0142] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0143] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0144] Program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0145] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to an exemplary embodiment of the present invention, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0146] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A control method for an inverter circuit, characterized in that: The control method shown includes: Acquiring an output active power value of the inverter circuit and an output current value of the inverter circuit; Obtaining a voltage compensation value according to the output active power value and the output current value; Obtaining a target output voltage value according to the voltage compensation value and a reference output voltage value of the inverter circuit; A control signal is generated according to the target output voltage value, and the control signal is used to control the inverter circuit to adjust the output voltage value of the inverter circuit.

2. The control method of the inverter circuit according to claim 1, characterized in that: The obtaining the output active power value of the inverter circuit and the output current value of the inverter circuit includes: Within a preset period, obtaining an instantaneous value of an output voltage and an instantaneous value of an output current of the inverter circuit at each sampling moment; The output active power value of the inverter circuit and the output current value of the inverter circuit are obtained according to the instantaneous value of the output voltage and the instantaneous value of the output current of the inverter circuit at each sampling moment.

3. The control method of the inverter circuit according to claim 1, characterized in that: The obtaining of the voltage compensation value according to the output active power value and the output current value comprises: Obtaining a rated output power value and a given current value of the inverter circuit; Obtaining a first voltage compensation value according to the output active power value and the rated output power value; Obtaining a second voltage compensation value according to the output current value and the given current value; The voltage compensation value is obtained according to the first voltage compensation value and the second voltage compensation value.

4. The control method of the inverter circuit according to claim 3, characterized in that: The obtaining a first voltage compensation value according to the output active power value and the rated output power value comprises: Subtracting the output active power value from the rated output power value to obtain a power deviation value; The power deviation value is deviation-adjusted to obtain the first voltage compensation value.

5. The control method of the inverter circuit according to claim 3, characterized in that: The obtaining of the second voltage compensation value according to the output current effective value and the given current effective value comprises: Subtract the output current value from the given current value to obtain a current deviation value; The current deviation value is deviation-adjusted to obtain a second voltage compensation value.

6. The control method of the inverter circuit according to claim 3, characterized in that: The voltage compensation value is obtained according to the first voltage compensation value and the second voltage compensation value, comprising: A smaller value between the first voltage compensation value and the second voltage compensation value is selected as the voltage compensation value.

7. The control method of the inverter circuit according to claim 1, characterized in that: The step of obtaining a target output voltage value according to the voltage compensation value and a reference output voltage value of the inverter circuit comprises: The sum of the voltage compensation value and the reference output voltage value is used as the target output voltage value.

8. A power conversion device, characterized in that: The power conversion device includes an inverter circuit, an AC output interface and a control device, the output end of the inverter circuit is connected to the AC output interface, the control device is connected to the inverter circuit, the control device includes a processor and a memory, the memory is used to store a computer program, the processor is used to execute the computer program and implement the control method of the inverter circuit as described in any one of claims 1 to 7 when executing the computer program.

9. An energy storage device, characterized in that: The energy storage device includes a battery module, an inverter circuit, an AC output interface and a control device. The battery module is used to provide electrical energy input to the input end of the inverter circuit. The output end of the inverter circuit is connected to the AC output interface. The control device is connected to the inverter circuit. The control device includes a processor and a memory. The memory is used to store a computer program. The processor is used to execute the computer program and, when executing the computer program, implement the control method of the inverter circuit as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor implements the control method of the inverter circuit according to any one of claims 1 to 7.

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