High-Voltage Ride-Through Control Method and Storage Medium for Three-Phase Four-Wire Inverter

Abstract

The present invention relates to the field of power electronics control technology, and discloses a high-voltage ride-through control method and a storage medium for a three-phase four-wire inverter. The high-voltage ride-through control method includes: 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. In the present invention, 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 correspondingly controlled to increase the DC operating range for the inverter to perform high-voltage ride-through, so that the inverter can stably achieve high-voltage ride-through when the DC bus is relatively low, and avoid the situation of ride-through downtime.

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. Current mainstream grid connection standards require inverters to 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 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 single-stage three-phase four-wire inverters cannot operate stably, easily leading to inverter downtime. 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 reason, the present invention proposes 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 downtime.

[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:

[0005] Obtaining the total positive-sequence voltage component of the three-phase four-wire inverter;

[0006] 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;

[0007] Wherein, the N-line voltage threshold is associated with the real-time N-line voltage of the three-phase four-wire inverter.

[0008] 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:

[0009] 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;

[0010] 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.

[0011] 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:

[0012] 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.

[0013] Optionally, in an embodiment of the present invention, obtaining the total positive-sequence voltage component of the three-phase four-wire inverter includes:

[0014] 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;

[0015] 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;

[0016] 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.

[0017] 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:

[0018] ;

[0019] 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.

[0020] 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:

[0021] Real-time monitor the duration of the three-phase four-wire inverter generating waves in the three-phase three-wire wave generation mode;

[0022] When it is monitored that the duration exceeds a preset high-voltage crossing time threshold, perform fault protection on the three-phase four-wire inverter.

[0023] 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.

[0024] In a second aspect, an embodiment of the present invention provides an electronic device, including:

[0025] At least one processor;

[0026] At least one memory for storing at least one program;

[0027] 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.

[0028] 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 the 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.

[0029] 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, and thus the real-time application state of the three-phase four-wire inverter is correspondingly controlled to increase the DC operating range of the inverter for high-voltage ride-through, so that the inverter can stably achieve high-voltage ride-through when the DC bus is low, and avoid the situation of ride-through downtime. Description of the Drawings

[0030] 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;

[0031] Figure 2 is Figure 1 a flowchart of step S1000 in

[0032] Figure 3 is the circuit topology schematic diagram of the three-phase four-wire inverter provided by an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of real-time grid voltage phase locking provided by an embodiment of the present invention;

[0034] Figure 5 is a schematic diagram of the analog quantity conversion of the real-time grid voltage provided by an embodiment of the present invention;

[0035] Figure 6 is Figure 1 a flowchart of step S2000 in

[0036] Figure 7 is the circuit topology schematic diagram of a three - phase four - wire inverter provided by another embodiment of the present invention;

[0037] Figure 8 is the execution flow schematic diagram of the high - voltage ride - through control method of a three - phase four - wire inverter provided by an embodiment of the present invention;

[0038] Figure 9 is Figure 1 another flowchart of step S2000 in

[0039] Figure 10 is the structural schematic diagram of an electronic device provided by an embodiment of the present invention. Detailed implementation manners

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, 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.

[0041] It should be noted that although the functional modules are divided 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 order from the module division in the device or the sequence in the flowchart.

[0042] Figure 1 is the flowchart of the high - voltage ride - through control method of 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 of the three - phase four - wire inverter may include but is not limited to steps S1000 to S2000.

[0043] Step S1000: Obtain the total positive - sequence voltage component of the three - phase four - wire inverter;

[0044] 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;

[0045] Among them, the N-line voltage threshold is associated with the real-time voltage of the N-line 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 voltage of the N-line of the three-phase four-wire inverter. For example, if the real-time voltage of the N-line 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 voltage of the N-line 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 voltage of the N-line of the three-phase four-wire inverter, but this is not the only limitation.

[0046] 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, when the N-line voltage threshold is associated with the real-time voltage of the N-line 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 correspondingly controlled to increase the DC operating range for the inverter to perform high-voltage ride-through, so that the inverter can stably achieve high-voltage ride-through when the DC bus is low, and avoid the situation of ride-through downtime.

[0047] As Figure 2 shown, in an embodiment of the present invention, step S1000 may but is not limited to include the following steps:

[0048] 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;

[0049] 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 d-axis positive-sequence component and the q-axis positive-sequence component;

[0050] Step S1300: Calculate the total positive-sequence voltage component of the three-phase four-wire inverter according to the d-axis positive-sequence component and the q-axis positive-sequence component.

[0051] 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 the three-to-two transformation to obtain the d-axis positive-sequence component and the q-axis positive-sequence component of the three-phase four-wire inverter, so that based on the d-axis positive-sequence component and the q-axis positive-sequence component, the total positive-sequence voltage component of the three-phase four-wire inverter can be accurately calculated, 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.

[0052] It should be noted that there are various three-phase four-wire inverters applicable to this embodiment, and those skilled in the art can make corresponding selections according to the actual application scenarios without limitation here. For example, but not limited to, a DC-AC topology based on an LCL filter can be adopted. This part of the topology can include, but is not limited to, a DC input part, a power part, an AC filtering part, and an AC-side relay unit, etc. 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 construed as any limitation or restriction thereto.

[0053] Figure 3 It 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:

[0054] 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, and the negative bus capacitor C dw is arranged on the negative bus. The specific specifications of the positive bus capacitor C up and the negative bus capacitor C dw are various and can be set accordingly according to the specific scenario without limitation here;

[0055] A power unit, including power switching tubes Q A1 , Q A2 , Q A3 , Q A4 , Q B1 , Q B2 , Q B3 , Q B4 , Q C1 , Q C2 , Q C3 [[ID=5...]] , and Q C4 , as well as diodes D A1 , D A2 , D B1 , D B2 , D C1 , and D C2 ;

[0056] An AC filtering unit, including 3 LCL filters, namely L A1 , C A , LA2 , L B1 , C B , L B2 , L C1 , C C and L C2 ;

[0057] The AC-side relay unit includes the phase-A relay S A , the phase-B relay S B , the phase-C relay S C and the N-line relay S N .

[0058] During application, as shown in Figure 4 , first perform phase-locking 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 shown in Figure 5 , perform a three-phase to two-phase coordinate transformation on the grid voltages V a , V b and V c collected on the AC side in combination with the phase angle θ to obtain the positive-sequence d-axis component , the negative-sequence d-axis component , the positive-sequence q-axis component and the negative-sequence q-axis component . Furthermore, based on the positive-sequence d-axis component and the positive-sequence q-axis component , calculate the total positive-sequence voltage component of the three-phase four-wire inverter . For example, it can be calculated but not limited to using the following formula:

[0059] .

[0060] The three-phase four-wire inverter and the application scenario 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 on 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 use first-level relays, but in actual processes, multi-level relays or switches can also be used according to different situations. Those skilled in the art can know that with the evolution of the three-phase four-wire inverter and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are also applicable to similar technical problems.

[0061] Those skilled in the art can understand that Figure 3The three-phase four-wire inverter shown does not limit the embodiments of the present invention, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0062] 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 may but is not limited to including the following steps:

[0063] Step S2100: When the total positive-sequence voltage component is greater than or equal to a preset N-line voltage threshold, block the wave of the three-phase four-wire inverter;

[0064] 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.

[0065] Considering that when the inverter is normally connected to the grid voltages V a 、V b and V c theoretically, the lowest voltage at which the inverter can work normally is That is to say, when the DC voltage of the inverter is lower than this voltage, it will not be able to work normally. At this time Figure 3 the circuit topology shown will actually evolve into Figure 7 the circuit topology shown, 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 time when the mains voltage rises, or in some special scenarios, it is also required to output reactive power to absorb the grid energy. Therefore, if the inverter works in the uncontrolled rectification state, it cannot meet this application requirement.

[0066] 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 judged that the total positive-sequence voltage component is greater than or equal to the preset N-line voltage threshold, first block the wave of the inverter to prevent the N-line current from increasing due to single-phase high-voltage ride-through and being unable to disconnect the N-line relay; after the inverter wave blocking is completed, immediately issue an instruction to disconnect the N-line relay, and wait until it is confirmed 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 judged that the N-line relay has been disconnected, otherwise continue to monitor it), then control the three-phase four-wire inverter to generate waves in the three-phase three-wire wave generation mode to achieve high-voltage ride-through of the inverter. It can be understood that since the DC voltage corresponding to the three-phase three-wire wave generation mode is lower than It will enter the uncontrolled rectification state only under certain circumstances. Therefore, adopting the three-phase three-wire wave generation method can greatly reduce the probability of the uncontrolled rectification state occurring, increase the DC operating range for the inverter to perform high-voltage ride-through, enable the inverter to stably achieve high-voltage ride-through when the DC bus is relatively low, and avoid the situation of ride-through shutdown.

[0067] 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 including the following steps:

[0068] 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.

[0069] 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, immediately 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 for power recovery after high-voltage ride-through.

[0070] It should be noted that the specific content of the three-phase three-wire wave generation method and the three-phase four-wire wave generation method in the above embodiments is not limited. 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 can be configured as vector wave generation, etc. Since 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.

[0071] In an embodiment, when controlling the three-phase four-wire inverter to generate waves according to the three-phase three-wire wave generation method, the three-phase four-wire inverter can also but is not limited to be controlled as follows:

[0072] Real-time monitor the duration of the three-phase four-wire inverter generating waves according to the three-phase three-wire wave generation method. When the monitored duration exceeds the preset high-voltage ride-through time threshold, perform fault protection on the three-phase four-wire inverter.

[0073] Considering that the high-voltage ride-through time should be maintained within a reasonable limit, by monitoring the duration of the inverter generating waves according to the three-phase three-wire wave generation method to determine whether the high-voltage ride-through time exceeds the set time limit. If so, it indicates that the inverter may have a running fault problem. Therefore, it is necessary to perform fault protection on the three-phase four-wire inverter.

[0074] Among them, the high-voltage ride-through time threshold and the specific application means of fault protection can both be set accordingly according to different application scenarios, and there is no limitation here.

[0075] Figure 10 FIG. 4 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 may be one or more, and one memory 1100 and one processor 1200 are taken as an example herein; the memory 1100 and the processor 1200 in the device may be connected through a bus or other means, Figure 10 Figure 10 and the connection through the bus is taken as an example herein.

[0076] 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 a three-phase four-wire inverter provided by any embodiment of the present invention. The processor 1200 realizes the 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.

[0077] 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 further 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 set 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 enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0078] 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 by any embodiment of the present invention.

[0079] 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 the processor of the 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 by any embodiment of the present invention.

[0080] The electronic devices and application scenarios described in the embodiments of the present invention are used to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. As known to those skilled in the art, 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.

[0081] 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 systems and devices, can be implemented as software, firmware, hardware, and appropriate combinations thereof.

[0082] In a hardware implementation, the division of functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be executed by several physical components in cooperation. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can 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 disk (DVD) or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and 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 can include any information delivery medium.

[0083] As used in this specification, the terms "component", "module", "system", etc. are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component can 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, both an application running on a computing device and the computing device can be components. One or more components can reside within a process or execution thread, and a component can be located on one computer or distributed between two or more computers. In addition, these components can execute from various computer-readable media having various data structures stored thereon. A component can, for example, communicate by signals according to one or more data packets (e.g., data from two components interacting with another component in a local system, a distributed system, or across a network, such as the Internet interacting with other systems via signals).

Claims

1. A high-voltage ride-through control method for a three-phase four-wire inverter, characterized in that, 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, and 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; When the wave blocking of the three-phase four-wire inverter is completed, disconnecting the N-line relay and controlling the three-phase four-wire inverter to generate waves in a three-phase three-wire wave generation mode.

2. The high-voltage ride-through control method for a three-phase four-wire inverter according to claim 1, wherein 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 further includes: When the total positive-sequence voltage component is less than the preset N-line voltage threshold, closing the N-line relay and controlling the three-phase four-wire inverter to generate waves in a three-phase four-wire wave generation mode.

3. The high-voltage ride-through control method for a three-phase four-wire inverter according to claim 1, characterized in that The obtaining the total positive-sequence voltage component of the three-phase four-wire inverter includes: Collecting the real-time grid voltage of the three-phase four-wire inverter and performing phase-locking on the real-time grid voltage to obtain the phase angle of the real-time grid voltage; Performing a 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 a d-axis positive-sequence component and a q-axis positive-sequence component; Calculating the total positive-sequence voltage component of the three-phase four-wire inverter according to the d-axis positive-sequence component and the q-axis positive-sequence component.

4. The high-voltage ride-through control method for a three-phase four-wire inverter according to claim 3, characterized in that Calculating the total positive-sequence voltage component of the three-phase four-wire inverter through the positive-sequence voltage component formula in combination with the d-axis positive-sequence component and the q-axis positive-sequence component; the positive-sequence voltage component formula is as follows: Among them, V p is the total positive-sequence voltage component of the three-phase four-wire inverter, V d_p is the d-axis positive-sequence component, and V q_p is the q-axis positive-sequence component.

5. The high-voltage ride-through control method for a three-phase four-wire inverter according to claim 1, characterized in that, When controlling the three-phase four-wire inverter 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 a three-phase three-wire wave generation mode; When it is monitored that the duration exceeds a preset high-voltage ride-through time threshold, performing fault protection on the three-phase four-wire inverter.

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

7. An electronic device, characterized in that, 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, implementing the high-voltage ride-through control method of the three-phase four-wire inverter according to any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that, Wherein there is a program executable by the processor, 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 according to any one of claims 1 to 6.

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