INPC type inverter bridge arm short circuit detection method and device

Abstract

The invention discloses an INPC type inverter bridge arm short circuit detection method and device, relates to the technical field of inverter safety detection, and solves the problem that in the prior art, INPC type inverter bridge arm short circuit detection does not exist. The short-circuit detection method for the bridge arm IGBT transistor of the T-type inverter comprises the following steps: disconnecting an alternating-current relay, connected with a power grid, on the alternating-current side of the INPC-type inverter, connecting direct current of a photovoltaic module to the direct-current side of the INPC-type inverter, collecting initial inversion phase voltage, and carrying out short-circuit detection on the bridge arm IGBT transistor of the T-type inverter according to the initial inversion phase voltage, so as to obtain a short-circuit detection result of the bridge arm IGBT transistor of the T-type inverter; then, only one device in the bridge arm is conducted in sequence, whether the detected device is short-circuited or not is judged according to the value of the inversion phase voltage, an auxiliary detection circuit does not need to be newly added, the complexity of an original circuit is not increased, cost is low, and meanwhile the detection method is accurate and reliable; whether the IGBT transistor and the fly-wheel diode of the INPC type inverter bridge arm are short-circuited or not can be effectively detected in advance, and effective early warning and protection can be carried out on the inverter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inverter safety detection, and particularly to an INPC type inverter bridge arm short circuit detection method and device. BACKGROUND

[0002] In the design of an inverter, an inverter topology circuit is a core part. An INPC type inverter topology includes four IGBT transistors and two freewheeling diodes. If an IGBT transistor or a diode short circuit is not detected in time, then the machine half bus short circuit explosion and fire phenomenon are likely to occur when the wave is emitted and the phase is locked.

[0003] Among the current detection methods, there is only a short circuit detection method for the IGBT transistors of a T type inverter bridge arm, and there is no short circuit detection method for the IGBT transistors of an INPC type inverter topology. In addition, in the short circuit detection method for the IGBT transistors of a T type inverter bridge arm, a power grid side relay needs to be closed, and a current limiting resistor and an auxiliary detection relay are additionally added at the output of a three-phase bridge arm. The detection circuit is complex and the cost is high. SUMMARY

[0004] The present application aims to overcome the problems of no INPC type inverter bridge arm short circuit detection and high cost and complex circuit caused by the additional resistors and relays in the short circuit detection method for the IGBT transistors of a T type inverter bridge arm, and to provide an INPC type inverter bridge arm short circuit detection method and device.

[0005] In a first aspect, an INPC type inverter bridge arm short circuit detection method is provided, which includes:

[0006] disconnecting an AC relay connecting an AC side of the INPC type inverter to a power grid;

[0007] connecting a DC power of a photovoltaic module to a DC side of the INPC type inverter, and collecting an initial inverter phase voltage;

[0008] controlling the inverter bridge arm to only turn on a first IGBT transistor, collecting a first inverter phase voltage, and determining that a second IGBT transistor is short circuited if the first inverter phase voltage is equal to a positive bus voltage;

[0009] if the first inverter phase voltage is equal to the initial inverter phase voltage, determining that the second IGBT transistor is not short circuited, controlling the inverter bridge arm to only turn on a fourth IGBT transistor, collecting a second inverter phase voltage, and determining that a third IGBT transistor is short circuited if the second inverter phase voltage is equal to a negative bus voltage;

[0010] If the second inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the third IGBT transistor is not short-circuited, the inverter bridge arm is controlled to only conduct the second IGBT transistor, the third inverter phase voltage is collected, and if the third inverter phase voltage is equal to the positive bus voltage, it is judged that the first IGBT transistor is short-circuited;

[0011] If the third inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the first IGBT transistor is not short-circuited, the inverter bridge arm is controlled to only conduct the third IGBT transistor, the fourth inverter phase voltage is collected, and if the fourth inverter phase voltage is equal to the negative bus voltage, it is judged that the fourth IGBT transistor is short-circuited;

[0012] If the fourth inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the fourth IGBT transistor is not short-circuited, the inverter bridge arm is controlled to only conduct the second IGBT transistor, the fifth inverter phase voltage is collected, and if the fifth inverter phase voltage is equal to 0, it is judged that the first inverter bridge arm freewheeling diode is short-circuited;

[0013] If the fifth inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the first inverter bridge arm freewheeling diode is not short-circuited, the inverter bridge arm is controlled to only conduct the third IGBT transistor, the sixth inverter phase voltage is collected, and if the sixth inverter phase voltage is equal to 0, it is judged that the second inverter bridge arm freewheeling diode is short-circuited, and if the sixth inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the second inverter bridge arm freewheeling diode is not short-circuited.

[0014] In some possible implementation manners, the inverter bridge arm comprises a first IGBT transistor, a second IGBT transistor, a third IGBT transistor and a fourth IGBT transistor connected in series between the positive DC bus and the negative DC bus, and a first inverter bridge arm freewheeling diode and a second inverter bridge arm freewheeling diode connected in series between the collector of the second IGBT transistor and the emitter of the third IGBT transistor.

[0015] In some possible implementation manners, the neutral point between the first inverter bridge arm freewheeling diode and the second inverter bridge arm freewheeling diode and the neutral point between the second IGBT transistor and the third IGBT transistor are directly connected in series with a filter capacitor and an inductor.

[0016] In some possible implementation manners, the initial inverter phase voltage, the first inverter phase voltage, the second inverter phase voltage, the third inverter phase voltage, the fourth inverter phase voltage, the fifth inverter phase voltage and the sixth inverter phase voltage are all voltages across the first filter capacitor.

[0017] In some possible implementation manners, if any of the first IGBT transistor, the second IGBT transistor, the third IGBT transistor, the fourth IGBT transistor, the first inverter bridge arm freewheeling diode and the second inverter bridge arm freewheeling diode is short-circuited, the INPC type inverter is stopped and the user is notified to handle.

[0018] In some possible implementation manners, the voltage across the first filter capacitor is sampled by a voltage sampling circuit provided in the INPC type inverter.

[0019] In some possible implementation manners, the INPC type inverter bridge arm short circuit detection method is executed by a processor provided in the INPC type inverter to realize automatic detection of the bridge arm short circuit.

[0020] In a second aspect, a computer program product containing instructions, when executed on a computer, causes the computer to execute the method of the first aspect.

[0021] In a third aspect, a storage medium is provided, the computer readable medium stores program codes for execution by a device, and the program codes include steps for executing the method in any one of the implementation manners of the first aspect.

[0022] In a fourth aspect, an electronic device is provided, the electronic device includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and the program or instructions, when executed by the processor, implement the method in any one of the implementation manners of the first aspect.

[0023] The method of the present application can detect short circuits of the four IGBT transistors and the two freewheeling diodes of the INPC type inverter bridge arm respectively, thereby ensuring that the INPC type inverter will not be at risk of explosion due to short circuit of a certain bridge arm device, and without the need to add an auxiliary detection circuit, the complexity of the original circuit is not increased, the cost is low, and the detection method is accurate and reliable, which can effectively detect whether the IGBT transistors and the freewheeling diodes of the INPC type inverter bridge arm are short circuited, and effectively warn and protect the inverter. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve the purpose of explaining the present application. The accompanying drawings should not be construed in a limiting manner as the present application.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0026] Figure 1 is a flowchart of the INPC type inverter bridge arm short circuit detection method of embodiment 1 of the present application;

[0027] Figure 2 is a topology diagram of a bridge arm in the INPC type inverter bridge arm short circuit detection method of embodiment 1 of the present application;

[0028] Figure 3 is a topology diagram of disconnecting the AC relay of the INPC type inverter in the INPC type inverter bridge arm short circuit detection method of embodiment 1 of the present application;

[0029] Figure 4 is a conduction loop schematic diagram of TA1 conduction and TA2 short circuit or TA2 conduction and TA1 short circuit in the INPC type inverter bridge arm short circuit detection method of embodiment 1 of the present application;

[0030] Figure 5 is a conduction loop schematic diagram of TA3 conduction and TA4 short circuit or TA4 conduction and TA3 short circuit in the INPC type inverter bridge arm short circuit detection method of embodiment 1 of the present application;

[0031] Figure 6 is a conduction loop schematic diagram of TA2 conduction and DA5 short circuit in the INPC type inverter bridge arm short circuit detection method of embodiment 1 of the present application;

[0032] Figure 7 is a conduction loop schematic diagram of TA3 conduction and DA6 short circuit in the INPC type inverter bridge arm short circuit detection method of embodiment 1 of the present application;

[0033] Figure 8 is a circuit schematic diagram for implementing the INPC type inverter bridge arm short circuit detection method by using the MCU and operational amplifier chip of the INPC type inverter in embodiment 1 of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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 the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0035] Embodiment 1

[0036] As shown in Figure 1 , the INPC type inverter bridge arm short circuit detection method related by embodiment 1 of the present application includes:

[0037] As shown in Figure 2As shown, the inverter bridge arm includes the first IGBT transistor TA1, the second IGBT transistor TA2, the third IGBT transistor TA3 and the fourth IGBT transistor TA4 connected in series between the positive DC bus and the negative DC bus, and the first inverter bridge arm freewheeling diode DB1 and the second inverter bridge arm freewheeling diode DB2 connected in series between the collector of the second IGBT transistor TA2 and the emitter of the third IGBT transistor TA3, as shown in Figure 3 As shown, the neutral point between the first inverter bridge arm freewheeling diode DB1 and the second inverter bridge arm freewheeling diode DB2 is directly connected in series with the neutral point between the second IGBT transistor TA2 and the third IGBT transistor TA3, and the first filter capacitor C1 and the first inductor L1.

[0038] S100, as shown Figure 3 Before the INPC type inverter bridge arm short circuit detection is performed, the relay AC relay connected with the power grid on the AC side of the INPC type inverter is turned off.

[0039] S200, when the INPC type inverter PV (i.e. DC power from the solar panel (photovoltaic module)) is powered on, the INPC type inverter usually samples the voltage of the positive and negative buses and the inverter phase voltage, if at this time the positive bus voltage is VBUS+, the negative bus voltage is VBUS-, and the inverter A phase voltage is VC1 (i.e. Figure 2 When the inverter is not powered on and connected to the grid, the half bus voltage will charge the first filter capacitor C1 through the diode with a certain leakage current, and the voltage across the first filter capacitor C1 will be charged to the initial inverter phase voltage VC0, which is greater than 0 and less than the half bus voltage.

[0040] S300, first, the INPC type inverter only controls the first IGBT transistor TA1 to be attracted, if at this time the second IGBT transistor TA2 appears to be short-circuited, the positive bus voltage will be superimposed on the first filter capacitor C1 through the first IGBT transistor TA1 and the second IGBT transistor TA2, at this time the voltage VC1 (i.e. the first inverter phase voltage) obtained by the first filter capacitor C1 to N point is the positive half bus voltage VBUS+, then it is judged that the second IGBT transistor TA2 is short-circuited, the other tests are terminated, the INPC type inverter is stopped and the user is notified to process, the notification can be in the form of short message, WeChat message, email, Dingding message and other timely information, and the conduction circuit is as shown in Figure 4 If the first inverter phase voltage VC1 is equal to the initial inverter phase voltage VC0, then the second IGBT transistor TA2 is not short-circuited.

[0041] S400, after judging that the second IGBT transistor TA2 is not short-circuited in step S300, the third IGBT transistor TA3 is detected. When the INPC type inverter only controls the fourth IGBT transistor TA4 to be attracted, if the third IGBT transistor TA3 is short-circuited at this time, the negative bus voltage is superimposed on the first filter capacitor C1 through the fourth IGBT transistor TA4 and the third IGBT transistor TA3, at this time, the voltage VC1 (i.e. the second inverter phase voltage) of the C1 to N point is the negative half bus voltage VBUS-, it is judged that the third IGBT transistor TA3 is short-circuited, the other tests are terminated, the INPC type inverter is stopped and the user is informed to process, and the on circuit is as shown by the red line in Figure 5 ; if the second inverter phase voltage VC1 is equal to the initial inverter phase voltage VC0, then the third IGBT transistor TA3 is not short-circuited.

[0042] S500, after judging that the third IGBT transistor TA3 is not short-circuited in step S400, the first IGBT transistor TA1 is detected. When the INPC type inverter only controls the second IGBT transistor TA2 to be attracted, if the first IGBT transistor TA1 is short-circuited at this time, the positive bus voltage is superimposed on the first filter capacitor C1 through the first IGBT transistor TA1 and the second IGBT transistor TA2, at this time, the voltage VC1 (i.e. the third inverter phase voltage) of the C1 to N point is the positive half bus voltage VBUS+, it is judged that the first IGBT transistor TA1 is short-circuited, the other tests are terminated, the INPC type inverter is stopped and the user is informed to process, and the on circuit is as shown by the red line in Figure 4 ; if the third inverter phase voltage VC1 is equal to the initial inverter phase voltage VC0, then the first IGBT transistor TA1 is not short-circuited.

[0043] S600, after judging that the first IGBT transistor TA1 is not short-circuited in step S500, the fourth IGBT transistor TA4 is detected. When the INPC type inverter only controls the third IGBT transistor TA3 to be attracted, if the fourth IGBT transistor TA4 is short-circuited at this time, the negative bus voltage is superimposed on the first filter capacitor C1 through the fourth IGBT transistor TA4 and the third IGBT transistor TA3, at this time, the voltage VC1 (i.e. the fourth inverter phase voltage) of the C1 to N point is the negative half bus voltage VBUS-, it is judged that the fourth IGBT transistor TA4 is short-circuited, the other tests are terminated, the INPC type inverter is stopped and the user is informed to process, and the on circuit is as shown by the red line in Figure 5 ; if the fourth inverter phase voltage VC1 is equal to the initial inverter phase voltage VC0, then the fourth IGBT transistor TA4 is not short-circuited.

[0044] S700. After determining in step S600 that the fourth IGBT transistor TA4 is not short-circuited, the next step is to check the first inverter bridge arm freewheeling diode DA5. The INPC inverter only controls the second IGBT transistor TA2 to engage. If the first inverter bridge arm freewheeling diode DA5 is short-circuited at this time, the voltage at point N, after passing through the first inverter bridge arm freewheeling diode DA5 and the second IGBT transistor TA2, is superimposed on the first filter capacitor C1. At this time, the voltage VC1 (i.e., the fifth inverter phase voltage) measured by C1 at point N is 0. Therefore, other tests are terminated, the INPC inverter is shut down, and the user is notified for processing. The conduction circuit is as follows: Figure 6 As shown by the red line in the middle; if the value of the fifth inverter phase voltage VC1 is equal to the initial inverter phase voltage VC0, then the freewheeling diode DA5 of the first inverter bridge arm is not short-circuited.

[0045] S800. After determining in step S700 that the first inverter arm freewheeling diode DA5 is not short-circuited, the next step is to test the second inverter arm freewheeling diode DA6. The INPC inverter only controls the third IGBT transistor TA3 to engage. If the second inverter arm freewheeling diode DA6 is short-circuited at this time, the voltage at point N is superimposed on the first filter capacitor C1 through the second inverter arm freewheeling diode DA6 and the third IGBT transistor TA3. At this time, the voltage VC1 (sixth inverter phase voltage) measured by C1 at point N is 0. Then, other tests are terminated, the INPC inverter is shut down, and the user is notified for handling. The conduction circuit is as follows: Figure 7 As shown by the red line in the middle; if the value of the sixth inverter phase voltage VC1 is equal to the initial inverter phase voltage VC0, then the freewheeling diode DA6 of the second inverter bridge arm is not short-circuited.

[0046] In this embodiment, the initial inverter voltage, the first inverter voltage, the second inverter voltage, the third inverter voltage, the fourth inverter voltage, the fifth inverter voltage, and the sixth inverter voltage are all the voltages across the first filter capacitor, i.e. Figure 3 The voltage VC1 between the first filter capacitor C1 and point N.

[0047] The INPC type inverter bridge arm short circuit detection method in the embodiment can detect whether the IGBT and the freewheeling diode of the INPC type inverter bridge arm are short-circuited, thereby ensuring that the inverter will not cause the risk of blowing up due to the short circuit of a certain bridge arm device, and without the need of adding an auxiliary detection circuit, the complexity of the original circuit is not increased, the cost is low, and the detection method is accurate and reliable, and can effectively detect whether the IGBT transistor and the freewheeling diode of the INPC type inverter bridge arm are short-circuited in advance, effectively warning and protecting the inverter, and the voltage across the first filter capacitor can be sampled through the voltage sampling circuit in the INPC type inverter, the INPC type inverter bridge arm short circuit detection method in the embodiment is executed by the processor of the INPC type inverter to realize automatic detection of the bridge arm short circuit, as shown in Figure 8 the sampling of the inverter phase voltage is realized by using the operational amplifier chip of the INPC type inverter, and the processor MCU of the INPC type inverter is used to execute the INPC type inverter bridge arm short circuit detection method in the embodiment, without the need of adding an additional voltage detection module, a processor and a memory to realize the short circuit detection of the INPC type inverter bridge arm.

[0048] Embodiment 2

[0049] The computer program product in the embodiment 2 of the application is used to store a computer program, and when the computer program runs on a computer, the method in any one of the implementation manners in the embodiment 1 is realized.

[0050] Embodiment 3

[0051] The storage medium in the embodiment 3 of the application stores program code for execution by a device, and the program code includes steps for executing the method in any one of the implementation manners in the embodiment 1 of the application.

[0052] The storage medium can be a read only memory (ROM), a static storage device, a dynamic storage device or a random access memory (RAM), and the storage medium can store program code, and when the program stored in the storage medium is executed by a processor, the processor is used to execute the steps of the method in any one of the implementation manners in the embodiment 1 of the application.

[0053] Embodiment 4

[0054] An electronic device related to the embodiment 4 of the present application, the electronic device comprises a processor, a memory, and a program or instruction stored on the memory and executable on the processor, and the program or instruction is executed by the processor to implement the method in any one of the implementation manners in the embodiment 1 of the present application.

[0055] The processor can be a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU), or one or more integrated circuits, for executing related programs to implement the method in any one of the implementation manners in the embodiment 1 of the present application.

[0056] The processor can also be an integrated circuit electronic device with signal processing capability. In the implementation process, each step of the method in any one of the implementation manners in the embodiment 1 of the present application can be completed by the integrated logic circuit of hardware in the processor or the instruction in the form of software.

[0057] The processor can also be a general processor, a digital signal processor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logic block diagrams in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory, or an electrically erasable programmable memory, a register, or other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the functions required to be executed by the units in the data processing device of the embodiments of the present application with the hardware to execute the method in any one of the implementation manners in the embodiment 1 of the present application.

[0058] The above is only the preferred specific embodiment of the present application; however, the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the improvement concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for detecting a short circuit of an INPC type inverter bridge arm, characterized in that, The application relates to an INPC type inverter. An AC relay is arranged between the AC side of the INPC type inverter and a power grid. DC power of a photovoltaic module is connected to the DC side of the INPC type inverter, and an initial inverter phase voltage is collected. If the first inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the second IGBT transistor is not short-circuited, the inverter bridge arm is controlled to be only turned on the fourth IGBT transistor, the second inverter phase voltage is collected, if the second inverter phase voltage is equal to the negative bus voltage, it is judged that the third IGBT transistor is short-circuited. If the second inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the third IGBT transistor is not short-circuited, the inverter bridge arm is controlled to be only turned on the second IGBT transistor, the third inverter phase voltage is collected, if the third inverter phase voltage is equal to the positive bus voltage, it is judged that the first IGBT transistor is short-circuited. If the third inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the first IGBT transistor is not short-circuited, the inverter bridge arm is controlled to be only turned on the third IGBT transistor, the fourth inverter phase voltage is collected, if the fourth inverter phase voltage is equal to the negative bus voltage, it is judged that the fourth IGBT transistor is short-circuited. If the fourth inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the fourth IGBT transistor is not short-circuited, the inverter bridge arm is controlled to be only turned on the second IGBT transistor, the fifth inverter phase voltage is collected, if the fifth inverter phase voltage is equal to 0, it is judged that the first inverter bridge arm freewheeling diode is short-circuited. If the fifth inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the first inverter bridge arm freewheeling diode is not short-circuited, the inverter bridge arm is controlled to be only turned on the third IGBT transistor, the sixth inverter phase voltage is collected, if the sixth inverter phase voltage is equal to 0, it is judged that the second inverter bridge arm freewheeling diode is short-circuited, if the sixth inverter phase voltage is equal to the initial inverter phase voltage, it is judged that the second inverter bridge arm freewheeling diode is not short-circuited. The inverter bridge arm comprises a first IGBT transistor, a second IGBT transistor, a third IGBT transistor and a fourth IGBT transistor connected in series between a positive DC bus and a negative DC bus, and a first inverter bridge arm freewheeling diode and a second inverter bridge arm freewheeling diode connected in series between the collector of the second IGBT transistor and the emitter of the third IGBT transistor.

2. The INPC type inverter bridge arm short circuit detection method according to claim 1, characterized in that, The neutral point between the first inverter bridge arm freewheeling diode and the second inverter bridge arm freewheeling diode and the neutral point between the second IGBT transistor and the third IGBT transistor are directly connected in series with a filter capacitor and an inductor.

3. The INPC type inverter bridge arm short circuit detection method according to claim 2, characterized in that, The initial inverter phase voltage, the first inverter phase voltage, the second inverter phase voltage, the third inverter phase voltage, the fourth inverter phase voltage, the fifth inverter phase voltage and the sixth inverter phase voltage are all voltages across the first filter capacitor.

4. The INPC type inverter bridge arm short circuit detection method according to claim 3, characterized in that, If any of the first IGBT transistor, the second IGBT transistor, the third IGBT transistor, the fourth IGBT transistor, the first inverter bridge arm freewheeling diode and the second inverter bridge arm freewheeling diode is short-circuited, the INPC type inverter is stopped and the user is informed to handle.

5. The INPC type inverter bridge arm short circuit detection method according to claim 1, characterized in that, ​ 6. The INPC type inverter bridge arm short circuit detection method according to claim 1, 3 or 4, characterized in that, The voltage sampling circuit samples the voltage across the first filter capacitor.

7. The INPC type inverter bridge arm short circuit detection method according to claim 6, characterized in that, The INPC type inverter bridge arm short circuit detection method is executed by the processor of the INPC type inverter to realize the automatic detection of the bridge arm short circuit.

8. A computer program product, characterised in that, The computer program product stores computer instructions, and the computer instructions are executed by the processor to realize the method in any one of claims 1-6.

9. A storage medium, characterized by The storage medium stores program codes for the equipment to execute, and the program codes include steps for executing the method in any one of claims 1-6, wherein the storage medium is self-provided by the INPC type inverter.

10. An electronic device, comprising: The electronic equipment includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and the program or instructions are executed by the processor to realize the method in any one of claims 1-6, wherein the processor and the memory are both self-provided by the INPC type inverter.

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