High voltage ride through control method of three-phase four-wire system inverter and storage medium

Abstract

The invention relates to the technical field of power electronic control, and discloses a high voltage ride through control method of a three-phase four-wire system inverter and a storage medium, and the high voltage ride through control method comprises the steps: obtaining a total positive sequence voltage component of the three-phase four-wire system inverter; controlling the real-time application state of the three-phase four-wire system inverter according to the size relation between the total positive sequence voltage component and a preset N-line voltage threshold value; wherein the N-line voltage threshold is associated with the N-line real-time voltage of the three-phase four-line inverter. According to the invention, the high-voltage ride-through scene of the three-phase four-wire system inverter is adaptively judged according to the size relation between the total positive sequence voltage component and the preset N-line voltage threshold value, so that the real-time application state of the three-phase four-wire system inverter is correspondingly controlled, the direct-current working range of the inverter for high-voltage ride-through is enlarged, and the high-voltage ride-through performance of the inverter is improved. The inverter can stably realize high voltage ride through when the direct current bus is relatively low, and the situation of ride through downtime is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic control, and in particular to a high-voltage ride-through control method, an electronic device, and a computer-readable storage medium for a three-phase four-wire inverter. Background Art

[0002] In recent years, energy storage inverters have been increasingly widely used in power systems. In current mainstream grid connection standards, it is required that inverters have the ability to ride through voltage faults, that is, when the grid fails or is subject to large disturbances, resulting in a voltage drop of the inverter grid connection voltage. Within the specified voltage drop range and duration interval, the inverter should be able to at least operate stably without disconnecting from the grid. In some application scenarios, it is also necessary to deliver a certain amount of reactive power to the grid to support the recovery of the grid voltage, so that the grid can resume stable operation as soon as possible. Currently, the high-voltage ride-through of a single-stage three-phase four-wire inverter cannot operate stably, which easily leads to the shutdown of the inverter. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems in the related art to some extent. For this purpose, the present invention provides a high-voltage ride-through control method and a storage medium for a three-phase four-wire inverter, which can achieve stable operation of the inverter during high-voltage ride-through and avoid the situation of ride-through shutdown.

[0004] In a first aspect, an embodiment of the present invention provides a high-voltage ride-through control method for a three-phase four-wire inverter, including: Obtaining the total positive-sequence voltage component of the three-phase four-wire inverter; Controlling the real-time application state of the three-phase four-wire inverter according to the magnitude relationship between the total positive-sequence voltage component and a preset N-line voltage threshold; Wherein, the N-line voltage threshold is associated with the real-time N-line voltage of the three-phase four-wire inverter.

[0005] Optionally, in an embodiment of the present invention, the three-phase four-wire inverter includes an N-line relay; the controlling the real-time application state of the three-phase four-wire inverter according to the magnitude relationship between the total positive-sequence voltage component and a preset N-line voltage threshold includes: When the total positive-sequence voltage component is greater than or equal to the preset N-line voltage threshold, blocking the wave of the three-phase four-wire inverter; After completing the wave blocking of the three-phase four-wire inverter, disconnecting the N-line relay and controlling the three-phase four-wire inverter to generate waves in the three-phase three-wire wave generation mode.

[0006] Optionally, in an embodiment of the present invention, the three-phase four-wire inverter includes an N-line relay; controlling the real-time application state of the three-phase four-wire inverter according to the magnitude relationship between the total positive-sequence voltage component and a preset N-line voltage threshold includes: When the total positive-sequence voltage component is less than the preset N-line voltage threshold, close the N-line relay and control the three-phase four-wire inverter to generate waves in the three-phase four-wire wave generation mode.

[0007] Optionally, in an embodiment of the present invention, obtaining the total positive-sequence voltage component of the three-phase four-wire inverter includes: Collect the real-time grid voltage of the three-phase four-wire inverter and perform phase locking on the real-time grid voltage to obtain the phase angle of the real-time grid voltage; Based on the real-time grid voltage and the phase angle of the real-time grid voltage, perform a three-phase to two-phase coordinate transformation to obtain the d-axis positive-sequence component and the q-axis positive-sequence component; According to the d-axis positive-sequence component and the q-axis positive-sequence component, calculate the total positive-sequence voltage component of the three-phase four-wire inverter.

[0008] Optionally, in an embodiment of the present invention, the total positive-sequence voltage component of the three-phase four-wire inverter is calculated by combining the positive-sequence voltage component formula with the d-axis positive-sequence component and the q-axis positive-sequence component; the positive-sequence voltage component formula is as follows: ; Wherein, is the total positive-sequence voltage component of the three-phase four-wire inverter, is the d-axis positive-sequence component, is the q-axis positive-sequence component.

[0009] Optionally, in an embodiment of the present invention, when controlling the three-phase four-wire inverter to generate waves in the three-phase three-wire wave generation mode, the method further includes: Real-time monitor the duration of the three-phase four-wire inverter generating waves in the three-phase three-wire wave generation mode; When it is monitored that the duration exceeds a preset high-voltage ride-through time threshold, perform fault protection on the three-phase four-wire inverter.

[0010] Optionally, in an embodiment of the present invention, the N-line voltage threshold is 1.1 times the real-time N-line voltage of the three-phase four-wire inverter.

[0011] In a second aspect, an embodiment of the present invention provides an electronic device, including: At least one processor; At least one memory for storing at least one program; When at least one of the at least one program is executed by at least one of the at least one processor, the high-voltage ride-through control method of the three-phase four-wire inverter as described in the first aspect is implemented.

[0012] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, in which a processor-executable program is stored, and when the processor-executable program is executed by a processor, it is used to implement the high-voltage ride-through control method of the three-phase four-wire inverter as described in the first aspect.

[0013] The high-voltage ride-through control method and storage medium of the three-phase four-wire inverter proposed by the present invention determine the real-time operating voltage condition of the three-phase four-wire inverter by obtaining the total positive-sequence voltage component of the three-phase four-wire inverter. Furthermore, when the N-line voltage threshold is related to the real-time N-line voltage of the three-phase four-wire inverter, according to the magnitude relationship between the total positive-sequence voltage component and the preset N-line voltage threshold, the high-voltage ride-through scenario of the three-phase four-wire inverter is adaptively judged, thereby correspondingly controlling the real-time application state of the three-phase four-wire inverter to increase the DC operating range of the inverter for high-voltage ride-through, enabling the inverter to stably achieve high-voltage ride-through when the DC bus is relatively low and avoiding the situation of ride-through downtime. Description of the Drawings

[0014] Figure 1 is a flowchart of the high-voltage ride-through control method of the three-phase four-wire inverter provided by an embodiment of the present invention; Figure 2 is Figure 1 a flowchart of step S1000 in Figure 3 is a circuit topology schematic diagram of the three-phase four-wire inverter provided by an embodiment of the present invention; Figure 4 is a schematic diagram of real-time grid voltage phase-locking provided by an embodiment of the present invention; Figure 5 is a schematic diagram of analog-to-digital conversion of real-time grid voltage provided by an embodiment of the present invention; Figure 6 is Figure 1 a flowchart of step S2000 in Figure 7 is a circuit topology schematic diagram of the three-phase four-wire inverter provided by another embodiment of the present invention; Figure 8 is an execution flow schematic diagram of the high-voltage ride-through control method of the three-phase four-wire inverter provided by an embodiment of the present invention; Figure 9 is Figure 1 another flowchart of step S2000 in Figure 10 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Specific implementation manners

[0015] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] It should be noted that although functional module division is performed in the device schematic diagram and the logical sequence is shown in the flowchart, in some cases, the steps shown or described can be executed in a different module division in the device or a different sequence in the flowchart.

[0017] Figure 1 It is a flowchart of a high-voltage ride-through control method for a three-phase four-wire inverter provided by an embodiment of the present invention. As Figure 1 shown, the high-voltage ride-through control method for the three-phase four-wire inverter may include but is not limited to steps S1000 to S2000.

[0018] Step S1000: Obtain the total positive-sequence voltage component of the three-phase four-wire inverter; Step S2000: Control the real-time application state of the three-phase four-wire inverter according to the magnitude relationship between the total positive-sequence voltage component and a preset N-line voltage threshold; Wherein, the N-line voltage threshold is related to the real-time N-line voltage of the three-phase four-wire inverter. In other words, the N-line voltage threshold is variably set according to the change of the real-time N-line voltage of the three-phase four-wire inverter. For example, if the real-time N-line voltage collected at the previous moment is Vn1, the N-line voltage threshold in this case can be set based on Vn1. Similarly, if the real-time N-line voltage collected at the later moment is Vn2, the N-line voltage threshold in this case can be set based on Vn2; preferably, the N-line voltage threshold is 1.1 times the real-time N-line voltage of the three-phase four-wire inverter, but this is not the only limitation.

[0019] In this step, by obtaining the total positive-sequence voltage component of the three-phase four-wire inverter, the real-time operating voltage condition of the three-phase four-wire inverter is determined. Furthermore, in the case where the N-line voltage threshold is related to the real-time N-line voltage of the three-phase four-wire inverter, according to the magnitude relationship between the total positive-sequence voltage component and the preset N-line voltage threshold, the high-voltage ride-through scenario of the three-phase four-wire inverter is adaptively judged, and thus the real-time application state of the three-phase four-wire inverter is controlled accordingly, so as to increase the DC operating range for the inverter to perform high-voltage ride-through, enabling the inverter to stably achieve high-voltage ride-through when the DC bus is relatively low and avoiding the situation of ride-through downtime.

[0020] As Figure 2 shown, in one embodiment of the present invention, step S1000 may but is not limited to include the following steps: Step S1100, collect the real-time grid voltage of the three-phase four-wire inverter, and perform phase-locking on the real-time grid voltage to obtain the phase angle of the real-time grid voltage; Step S1200, perform three-phase to two-phase coordinate transformation based on the real-time grid voltage and the phase angle of the real-time grid voltage to obtain the positive-sequence d-axis component and the positive-sequence q-axis component; Step S1300, calculate the total positive-sequence voltage component of the three-phase four-wire inverter according to the positive-sequence d-axis component and the positive-sequence q-axis component.

[0021] In this step, by obtaining the real-time grid voltage of the three-phase four-wire inverter and its corresponding phase angle, it is convenient to further perform three-to-two transformation to obtain the positive-sequence d-axis component and the positive-sequence q-axis component of the three-phase four-wire inverter, so that the total positive-sequence voltage component of the three-phase four-wire inverter can be accurately calculated based on the positive-sequence d-axis component and the positive-sequence q-axis component, that is, the total positive-sequence voltage component of the three-phase four-wire inverter is calculated by the above coordinate transformation method, and the effect is better.

[0022] It should be noted that the three-phase four-wire inverters applicable to this embodiment can be of various types, and those skilled in the art can make corresponding selections according to the actual application scenarios, which are not limited here. For example, it can but is not limited to adopt a DCAC topology based on an LCL filter, etc. This part of the topology can but is not limited to include a DC input part, a power part, an AC filtering part, and an AC side relay unit, etc. In order to better illustrate the working principles of the above embodiments, the following gives a specific implementation manner of a three-phase four-wire inverter as an example for illustration, but it should not be understood as any limitation or restriction to it.

[0023] Figure 3 This is the circuit topology schematic diagram of the three-phase four-wire inverter provided by an embodiment of the present invention. As Figure 3 shown, the three-phase four-wire inverter includes but is not limited to: A DC input unit, including a DC power supply V dc , a positive bus capacitor C up and a negative bus capacitor C dw , the positive bus capacitor C up and the negative bus capacitor C dw are connected in series to form a positive and negative bus branch, and the positive and negative bus branch is connected in parallel with the DC power supply V dc . Among them, the positive bus capacitor C up is arranged on the positive bus, the negative bus capacitor C dw is arranged on the negative bus, and the positive bus capacitor C upand the negative bus capacitor C dw The specific specifications of dw are various and can be set accordingly according to the specific scenario, which is not restricted here; The power unit includes power switching transistors Q A1 、Q A2 、Q A3 、Q A4 、Q B1 、Q B2 、Q B3 、Q B4 、Q C1 、Q C2 、Q C3 and Q C4 , and diodes D A1 、D A2 、D B1 、D B2 、D C1 and D C2 ; The AC filtering unit includes 3 LCL filters, namely L A1 、C A 、L A2 、L B1 、C B 、L B2 、L C1 、C C and L C2 ; The AC side relay unit includes phase A relay S A 、phase B relay S B 、phase C relay S C and neutral line relay S N .

[0024] During application, as Figure 4 shown, first, phase lock is performed based on the collected grid voltages V a 、V b and V c to obtain the phase angle θ of the grid voltage; then, as Figure 5 shown, the collected grid voltages V a 、V b and V c on the AC side are combined with the phase angle θ for three-phase to two-phase coordinate transformation to obtain the d-axis positive sequence component 、d-axis negative sequence component 、q-axis positive sequence component and q-axis negative sequence component , and then the total positive sequence voltage component of the three-phase four-wire inverter is calculated based on the d-axis positive sequence component and the q-axis positive sequence component to obtain , for example, it can be calculated by the following formula, but not limited to this: .

[0025] The three-phase four-wire inverter and its application scenarios described in the embodiments of the present invention are for more clearly illustrating the technical solutions of the embodiments of the present invention, and do not constitute a limitation to the technical solutions provided by the embodiments of the present invention. For example Figure 3 the S shown in A , S B , S C and S N all adopt first-level relays. However, in actual processes, multi-level relays or switches can also be used according to different situations. Those skilled in the art can understand that with the evolution of three-phase four-wire inverters and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0026] Those skilled in the art can understand that Figure 3 the three-phase four-wire inverter shown in

[0027] does not constitute a limitation to the embodiments of the present invention, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0027] As Figure 6 shown, in one embodiment of the present invention, when the three-phase four-wire inverter includes an N-line relay, step S2000 can include the following steps, but not limited to this: Step S2100: When the total positive-sequence voltage component is greater than or equal to the preset N-line voltage threshold, block the wave of the three-phase four-wire inverter; Step S2200: After blocking the wave of the three-phase four-wire inverter, disconnect the N-line relay and control the three-phase four-wire inverter to generate waves in the three-phase three-wire wave generation mode.

[0028] Considering that when the inverter is normally connected to the grid voltages V a , V b and V c , the theoretically lowest voltage at which the inverter can normally operate is . That is to say, when the DC voltage of the inverter is lower than this voltage, it will not be able to operate normally. At this time Figure 3 the circuit topology shown in Figure 7 will actually evolve into the circuit topology shown in

[0029] , and the inverter enters an uncontrolled rectification state; since the application scenario of high-voltage ride-through requires meeting the application requirement that the inverter cannot shut down within a certain period of time when the mains voltage rises, or in some special scenarios, it is also necessary to output reactive power to absorb the grid energy. Therefore, when the inverter operates in the uncontrolled rectification state, it cannot meet this application requirement.Therefore, in this step, as Figure 8 shown, taking the preset N-line voltage threshold as 1.1 times the real-time N-line voltage of the three-phase four-wire inverter as an example, when it is determined that the total positive-sequence voltage component is greater than or equal to the preset N-line voltage threshold, the inverter is first blocked to prevent the N-line current from increasing due to single-phase high-voltage crossing and the N-line relay cannot be disconnected; after the inverter blocking is completed, an instruction to disconnect the N-line relay is immediately issued. After confirming that the N-line relay has been disconnected (this process can be determined by real-time monitoring of the opening and closing state of the N-line relay, that is, until it is determined that the N-line relay has been disconnected, otherwise it is continuously monitored), the three-phase four-wire inverter is controlled to generate waves according to the three-phase three-wire wave generation method to achieve high-voltage crossing of the inverter. It can be understood that since the corresponding DC voltage in the three-phase three-wire wave generation method enters the uncontrolled rectification state only when it is lower than , the probability of the uncontrolled rectification state occurring can be greatly reduced by adopting the three-phase three-wire wave generation method, and the DC operating range of the inverter for high-voltage crossing is increased, enabling the inverter to stably achieve high-voltage crossing when the DC bus is low and avoiding the situation of crossing downtime.

[0030] As Figure 9 shown, in an embodiment of the present invention, when the three-phase four-wire inverter includes an N-line relay, step S2000 may but is not limited to include the following steps: Step S2300, when the total positive-sequence voltage component is less than the preset N-line voltage threshold, close the N-line relay and control the three-phase four-wire inverter to generate waves according to the three-phase four-wire wave generation method.

[0031] In this step, as Figure 8 shown, still taking the preset N-line voltage threshold as 1.1 times the real-time N-line voltage of the three-phase four-wire inverter as an example, when it is determined that the total positive-sequence voltage component is less than the preset N-line voltage threshold, the N-line relay is immediately closed and the three-phase four-wire inverter is controlled to generate waves according to the three-phase four-wire wave generation method to recover the power after high-voltage crossing.

[0032] It should be noted that the specific contents of the three-phase three-wire wave generation method and the three-phase four-wire wave generation method in the above embodiments are not limited, and those skilled in the art can configure the corresponding three-phase three-wire wave generation method or three-phase four-wire wave generation method according to the actual scenario. For example, the three-phase three-wire wave generation method is configured as vector wave generation, etc. Since both the three-phase three-wire wave generation method and the three-phase four-wire wave generation method are well known to those skilled in the art, they will not be elaborated here.

[0033] In one embodiment, when controlling a three-phase four-wire inverter to generate waveforms in the three-phase three-wire waveform generation mode, the three-phase four-wire inverter can be controlled as follows, but not limited to: Monitor in real time the duration of the three-phase four-wire inverter generating waveforms in the three-phase three-wire waveform generation mode. When it is detected that the duration exceeds a preset high-voltage ride-through time threshold, perform fault protection on the three-phase four-wire inverter.

[0034] Considering that the high-voltage ride-through time should be maintained within a reasonable limit, by monitoring the duration of the inverter generating waveforms in the three-phase three-wire waveform generation mode, it is judged whether the high-voltage ride-through time exceeds the set time limit. If so, it indicates that there may be an operating fault problem with the inverter. Therefore, fault protection needs to be performed on the three-phase four-wire inverter.

[0035] Among them, the high-voltage ride-through time threshold and the specific application means of fault protection can be set accordingly according to different application scenarios, and are not limited here.

[0036] Figure 10 It is a schematic structural diagram of an electronic device 1000 provided by an embodiment of the present invention. As Figure 10 shown, the electronic device 1000 includes a memory 1100 and a processor 1200. The number of the memory 1100 and the processor 1200 can be one or more, Figure 10 and one memory 1100 and one processor 1200 are taken as examples here; the memory 1100 and the processor 1200 in the device can be connected through a bus or other means, Figure 10 and the connection through a bus is taken as an example here.

[0037] The memory 1100, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the high-voltage ride-through control method of the three-phase four-wire inverter provided in any embodiment of the present invention. The processor 1200 realizes the above-mentioned high-voltage ride-through control method of the three-phase four-wire inverter by running the software programs, instructions, and modules stored in the memory 1100.

[0038] The memory 1100 may mainly include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function. In addition, the memory 1100 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some instances, the memory 1100 may further include a memory remotely disposed relative to the processor 1200, and these remote memories may be connected to the device through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0039] An embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions for executing the high-voltage ride-through control method of a three-phase four-wire inverter provided in any embodiment of the present invention.

[0040] An embodiment of the present invention further provides a computer program product including a computer program or computer instructions. The computer program or computer instructions are stored in a computer-readable storage medium, and a processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device executes the high-voltage ride-through control method of a three-phase four-wire inverter provided in any embodiment of the present invention.

[0041] The electronic devices and application scenarios described in the embodiments of the present invention are for more clearly illustrating the technical solutions of the embodiments of the present invention, and do not constitute a limitation to the technical solutions provided by the embodiments of the present invention. Those skilled in the art can know that with the evolution of electronic devices and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0042] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and appropriate combinations thereof.

[0043] In a hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be executed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and that can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium.

[0044] The terms "component", "module", "system", etc. as used in this specification are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, an execution thread, a program, or a computer. By way of illustration, an application running on a computing device and the computing device can both be components. One or more components may reside in a process or execution thread, and a component may be located on one computer or distributed between two or more computers. In addition, these components may execute from various computer-readable media having various data structures stored thereon. A component may communicate, for example, by signals according to one or more data packets (e.g., data from two components interacting with each other from a local system, a distributed system, or another component across a network, such as via the Internet interacting with other systems).

Claims

1. A high voltage ride through control method for a three-phase four-wire inverter, characterized in that: include: Obtaining a total positive sequence voltage component of the three-phase four-wire inverter; Controlling the real-time application state of the three-phase four-wire inverter according to the magnitude relationship between the total positive sequence voltage component and the preset N-line voltage threshold; The N-line voltage threshold is associated with the real-time voltage of the N-line of the three-phase four-wire inverter.

2. The high voltage ride through control method of a three-phase four-wire inverter according to claim 1, characterized in that: The three-phase four-wire inverter includes an N-line relay; the real-time application state of the three-phase four-wire inverter is controlled according to the magnitude relationship between the total positive sequence voltage component and a preset N-line voltage threshold, including: When the total positive sequence voltage component is greater than or equal to a preset N-line voltage threshold, the three-phase four-wire inverter is blocked; When the three-phase four-wire inverter is completed to seal the wave, the N-line relay is disconnected, and the three-phase four-wire inverter is controlled to generate waves in accordance with the three-phase three-wire wave generating mode.

3. The high voltage ride through control method of a three-phase four-wire inverter according to claim 1, characterized in that: The three-phase four-wire inverter includes an N-line relay; the real-time application state of the three-phase four-wire inverter is controlled according to the magnitude relationship between the total positive sequence voltage component and a preset N-line voltage threshold, including: When the total positive sequence voltage component is less than a preset N-line voltage threshold, the N-line relay is closed, and the three-phase four-wire inverter is controlled to generate waves in a three-phase four-wire wave generation mode.

4. The high voltage ride through control method of a three-phase four-wire inverter according to claim 1, characterized in that: The obtaining of the total positive sequence voltage component of the three-phase four-wire inverter comprises: Collecting the real-time voltage of the power grid of the three-phase four-wire inverter, and performing phase locking on the real-time voltage of the power grid to obtain the phase angle of the real-time voltage of the power grid; Performing three-phase-to-two-phase coordinate transformation based on the real-time voltage of the power grid and the phase angle of the real-time voltage of the power grid to obtain a d-axis positive sequence component and a q-axis positive sequence component; A total positive-sequence voltage component of the three-phase four-wire inverter is calculated based on the d-axis positive-sequence component and the q-axis positive-sequence component.

5. The high voltage ride through control method of a three-phase four-wire inverter according to claim 4, characterized in that: The total positive-sequence voltage component of the three-phase four-wire inverter is calculated by combining the d-axis positive-sequence component and the q-axis positive-sequence component through the positive-sequence voltage component formula; the positive-sequence voltage component formula is as follows: ； in, is the total positive sequence voltage component of the three-phase four-wire inverter, is the d-axis positive sequence component, is the q-axis positive sequence component.

6. The high voltage ride through control method of a three-phase four-wire inverter according to claim 2, characterized in that: When the three-phase four-wire inverter is controlled to generate waves in a three-phase three-wire wave generation mode, the method further includes: Real-time monitoring of the duration of the three-phase four-wire inverter generating waves in accordance with the three-phase three-wire generating mode; When it is monitored that the duration exceeds a preset high voltage ride-through time threshold, fault protection is performed on the three-phase four-wire inverter.

7. The high voltage ride through control method of a three-phase four-wire inverter according to claim 1, characterized in that: The N-line voltage threshold is 1.1 times the real-time voltage of the N-line of the three-phase four-wire inverter.

8. An electronic device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When at least one of the programs is executed by at least one of the processors, a high voltage ride-through control method for a three-phase four-wire inverter as described in any one of claims 1 to 7 is implemented.

9. A computer-readable storage medium, characterized in that: A program executable by a processor is stored therein, and when the program executable by the processor is executed by the processor, it is used to implement the high voltage ride-through control method of the three-phase four-wire inverter as described in any one of claims 1 to 7.

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