Method for determining voltage dividing inductance for arc grounding fault arc extinction of series voltage dividing distribution network and application thereof

Abstract

The application relates to the technical field of power system relay protection, in particular to a series voltage division type power distribution network arc ground fault arc extinction voltage division inductor determination method and application thereof. Compared with a traditional topological structure, the series voltage division of a passive structure can realize the use of only an isolation transformer without a step-up transformer structure, reduces the investment of large-capacity equipment, and eliminates the arc extinction error influence caused by the step-up transformer. On the other hand, the series voltage division of the inductor coil of the passive structure effectively reduces the capacity of the active arc extinction device on the basis of improving the arc extinction effect. On the other hand, based on the capacity of the isolation inverter, a suitable series inductance value is selected for voltage division, and the double optimization of the inverter capacity and the control effect is realized, so as to solve the problem of how to arc extinguish the single-phase ground fault in the series voltage division type power distribution network.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system relay protection, in particular to a method for determining the voltage dividing inductance of arc grounding fault arc extinction of series voltage dividing distribution network and application thereof. BACKGROUND

[0002] The series voltage dividing distribution network is a new type of distribution network architecture that realizes dynamic voltage distribution and optimization through series voltage regulating devices (such as power electronic converters). Compared with the traditional radial distribution network, it can solve the problems of voltage drop, imbalance and voltage fluctuation caused by the access of distributed energy resources (DER) due to line impedance.

[0003] One of the characteristics of the series voltage dividing distribution network is that the proportion of cable lines in the power grid is greater than that of the traditional distribution network. Therefore, when a single-phase grounding fault occurs in the line, the ground capacitance increases, and the arc caused by the large ground current during the fault is difficult to extinguish on its own. Long-term operation will accelerate the wear and tear of equipment and lines in the system, and even cause forest fires in extreme cases.

[0004] For the arc extinction problem of single-phase grounding fault, the traditional arc extinction method mainly injects compensation current or adjusts voltage through active arc extinction devices to suppress the arc. However, in the series voltage dividing distribution network, the excessive ground capacitance increases the ground capacitance current that needs to be compensated by the active arc extinction device, which in turn causes the output voltage amplitude of the device to rise above the rated voltage of the device, thereby causing the arc extinction effect to deteriorate.

[0005] Therefore, there is a need for a method that can determine the voltage dividing inductance of the series voltage dividing distribution network during arc grounding fault, so as to ensure reliable extinction of the arc during single-phase grounding fault and enhance the stability of the power system. SUMMARY

[0006] The main purpose of the present application is to provide a method for determining the voltage dividing inductance of arc grounding fault arc extinction of series voltage dividing distribution network, which aims to solve the problem of how to extinguish the arc when a single-phase grounding fault occurs in the series voltage dividing distribution network.

[0007] To achieve the above purpose, the present application provides a method for determining the voltage dividing inductance of arc grounding fault arc extinction of series voltage dividing distribution network, which includes two series-connected first and second inductor coils. The method comprises the following steps:

[0008] Obtaining the series inductance value between the first and second inductor coils and the fault phase voltage, wherein the series inductance value is associated with the capacity of the isolation inverter;

[0009] The sum of the series inductance value and the fault phase voltage is determined as a reference voltage, so as to regulate the outlet voltage of the isolation inverter and / or to eliminate arc based on the reference voltage.

[0010] Optionally, the following expression is met between the series inductance value and the isolation inverter capacity:

[0011]

[0012] In the formula, is the isolation inverter capacity, is the outlet voltage of the isolation inverter, is the output current of the isolation inverter, is the series inductance value.

[0013] Optionally, the step of regulating the outlet voltage of the isolation inverter or eliminating arc based on the reference voltage specifically includes:

[0014] adjusting the target outlet voltage of the isolation inverter to be equal to the reference voltage; and / or,

[0015] determining the voltage division value of the reference voltage on the first inductor coil or the second inductor coil, adjusting the voltage on the first inductor coil or the second inductor coil to the voltage division value or a numerical interval including the voltage division value, so as to zero the fault phase voltage.

[0016] Optionally, before the step of obtaining the series inductance value between the first inductor coil and the second inductor coil, the method further includes:

[0017] acquiring an outlet voltage value in the isolation inverter;

[0018] determining whether the outlet voltage value is greater than a preset outlet voltage threshold, wherein the preset outlet voltage threshold is expressed as:

[0019]

[0020] In the formula, is a preset phase voltage value, is the series inductance value;

[0021] If yes, it is judged that an arc ground fault occurs in the series voltage division type power distribution network, and the step of obtaining the series inductance value between the first inductor coil and the second inductor coil is executed.

[0022] In addition, to achieve the above object, the application further provides a voltage regulating device for an isolated inverter, which is applied to a series voltage distribution network including two series-connected first and second inductor coils, and comprises:

[0023] a collection module, configured to acquire a series inductance value between the first and second inductor coils and acquire a fault phase voltage, wherein the series inductance value is associated with an isolated inverter capacity;

[0024] an outlet voltage regulating module, configured to determine a sum of the series inductance value and the fault phase voltage as a reference voltage, so as to regulate an outlet voltage of the isolated inverter based on the reference voltage.

[0025] In addition, to achieve the above object, the application further provides an arc grounding fault arc extinguishing device, which is applied to a series voltage distribution network including two series-connected first and second inductor coils, and comprises:

[0026] a data collection module, configured to collect phase voltage values of each phase in a circuit;

[0027] a fault discrimination and starting module, configured to determine whether the phase voltage values are greater than a preset outlet voltage threshold value, and if yes, acquire a series inductance value between the first and second inductor coils and acquire a fault phase voltage, wherein the series inductance value is associated with an isolated inverter capacity;

[0028] a voltage determination module, configured to determine a sum of the series inductance value and the fault phase voltage as a reference voltage;

[0029] a control module, configured to determine a voltage division value of the reference voltage on the first or second inductor coil, and regulate a voltage on the first or second inductor coil to the voltage division value or a value interval including the voltage division value.

[0030] In addition, to achieve the above object, the application further provides a computer system, which comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the computer program, when executed by the processor, implements the steps of the series voltage distribution network arc grounding fault arc extinguishing voltage division inductance determination method.

[0031] In addition, to achieve the above object, the application further provides a computer readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the series voltage distribution network arc grounding fault arc extinguishing voltage division inductance determination method according to any one of the above.

[0032] The application has at least the following beneficial effects:

[0033] 1. By series voltage division of passive structure, compared with traditional topology structure, only isolated transformer is used without step-up transformer structure, which reduces the investment of large-capacity equipment and eliminates the arc extinction error caused by step-up transformer;

[0034] 2. By series voltage division of passive structure inductance coil, on the basis of improving arc extinction effect, the capacity of active arc extinction device is effectively reduced;

[0035] 3. Based on the capacity of isolated inverter, the appropriate series inductance value is selected for voltage division, which realizes the double optimization of inverter capacity and control effect. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The flowchart of the first embodiment of the arc grounding fault arc extinction voltage division inductance determination method of the series voltage division type power distribution network of the application;

[0037] Figure 2 The simulation model schematic diagram of the series voltage division type power distribution network with voltage division inductance coil involved in the embodiment of the application;

[0038] Figure 3 The active arc extinction topology diagram involved in the embodiment of the application;

[0039] Figure 4 The double closed loop control architecture schematic diagram involved in the embodiment of the application;

[0040] Figure 5 The active arc extinction fault point current change schematic diagram when arc grounding fault involved in the embodiment of the application;

[0041] Figure 6 The active arc extinction fault phase voltage change schematic diagram when arc grounding fault involved in the embodiment of the application;

[0042] Figure 7 The active arc extinction neutral point voltage change schematic diagram when arc grounding fault involved in the embodiment of the application.

[0043] Figure 8 The architecture schematic diagram of the hardware running environment of the computer system involved in the embodiment of the application;

[0044] The implementation, functional characteristics and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0045] For a better understanding of the above technical solutions, the exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0046] First embodiment

[0047] Due to the excessive ground capacitance in the series voltage division type power distribution network, the ground capacitance current to be compensated by the active arc extinguishing device increases, which easily leads to the output voltage amplitude of the device rising to exceed the rated voltage of the device. Therefore, in the present embodiment, two series-connected first inductor coil L1 and second inductor coil L2 are arranged in the series voltage division type power distribution network to realize series voltage division.

[0048] The specific principle is as follows: let the output current of the inverter in the circuit be , the outlet voltage of the inverter be , and the calculation formula of the inverter capacity be:

[0049]

[0050] The active arc extinguishing method of the conventional topology structure needs to use a large-capacity step-up transformer, so k = 15, and thus the required inverter capacity is:

[0051]

[0052] In the present embodiment, a method for realizing voltage division through the first inductor coil L1 and the second inductor coil L2 is proposed, and the required inverter capacity is:

[0053]

[0054] wherein, , represents the series inductance value between the first inductor coil and the second inductor coil.

[0055] It can be known that the series inductance value is associated with the isolation inverter capacity:

[0056]

[0057] It should be noted that in actual setting, the series inductance value can be set according to actual needs, and the isolation inverter capacity is also a preset value out of the factory, the outlet voltage and the output current are known, and thus the specific values of L1 and L2 are determined according to the desired In this embodiment, the specific values are not limited by calculation.

[0058] Further, after realizing the voltage division, with reference to Figure 1 The present embodiment also provides a method for determining the voltage dividing inductance for arc grounding fault arc extinction in a series voltage dividing type power distribution network, the method comprising the following steps:

[0059] S10, obtaining a series inductance value between the first inductance coil and the second inductance coil, and obtaining a fault phase voltage, wherein the series inductance value is associated with the capacity of the isolation inverter;

[0060] First, the series inductance value between the first inductance coil and the second inductance coil is obtained, and the fault phase voltage is obtained.

[0061] It can be understood that the fault phase voltage is the voltage value collected when a single-phase grounding fault occurs in a certain phase of the series voltage dividing type power distribution network, and if no single-phase grounding fault occurs in the series voltage dividing type power distribution network, the fault phase voltage cannot be collected.

[0062] S20, determining the sum of the series inductance value and the fault phase voltage as a reference voltage, to adjust the outlet voltage of the isolation inverter and / or to extinguish the fault arc based on the reference voltage.

[0063] In this step, let the fault phase be U A To realize arc extinction, the fault phase voltage is clamped close to zero, that is, Because Wherein is the voltage divided on the inductance, is the voltage divided on the fault phase A, assuming that the three-phase parameters of the power distribution network are symmetrical, the reference voltage is determined according to the fault phase voltage and the series inductance voltage division as:

[0064]

[0065] The voltage value used for arc extinction is:

[0066]

[0067] Wherein, is the opposite number of the voltage divided on the fault phase A.

[0068] In this embodiment, the determined reference voltage has two functions: adjusting the outlet voltage of the isolation inverter and extinguishing the fault arc.

[0069] It should be noted that in addition to the excessive ground capacitance in the series voltage division type power distribution network causing the output voltage amplitude of the active arc extinguishing device to rise to exceed the rated voltage of the device, the "voltage ferroresonance" generated when the power distribution network is single-phase grounded can produce repeated arc reignition, and the active arc extinguishing device can frequently adjust its output voltage to extinguish the arc. In this process, the output voltage can fluctuate and accumulate to overvoltage, causing the output voltage of the isolation inverter to be too high. Therefore, in order to avoid the output voltage of the device being too high, two inductors are introduced in series to divide the voltage, and only a small-capacity isolation transformer is used in the active arc extinguishing device without a step-up transformer structure.

[0070] In some optional embodiments, a voltage-current double-loop control method is adopted to control the inverter output voltage to be equal to the determined reference voltage through negative feedback adjustment.

[0071] In addition, when calculating the reference voltage after voltage division, the inductance series value of the two inductors needs to be added. The reference voltage calculated based on the inductance series value of the introduced inductors is used for fault arc extinguishing. In some optional embodiments, after the fault phase is selected, the voltage division of the negative of the reference voltage on the first inductor L1 or the second inductor L2 is taken as the division voltage value, and the voltage on the first inductor L1 or the second inductor L2 is continuously adjusted to approach the division voltage value through negative feedback adjustment until the voltage on the second inductor reaches the division voltage value or reaches a numerical interval including the division voltage value.

[0072] In the technical solution provided in the present embodiment, on the one hand, compared with the traditional topology structure, the series voltage division of the passive structure can realize the use of only an isolation transformer without a step-up transformer structure, thereby reducing the investment in large-capacity equipment and eliminating the arc extinguishing error caused by the step-up transformer; on the other hand, the series voltage division of the passive structure inductor can effectively reduce the capacity of the active arc extinguishing device on the basis of improving the arc extinguishing effect; on the other hand, based on the capacity of the isolation inverter, appropriate series inductance values are selected for voltage division, thereby realizing the dual optimization of the inverter capacity and the control effect.

[0073] Second Embodiment

[0074] Based on the first embodiment, the present embodiment provides a method for judging the occurrence of single-phase ground fault in the series voltage division type power distribution network. Before step S10, the method specifically comprises:

[0075] S10, collecting the output voltage value in the isolation inverter;

[0076] S20, determining whether the output voltage value is greater than a preset output voltage threshold value, wherein the preset output voltage threshold value The expression of the preset output voltage threshold value is:

[0077]

[0078] wherein, is a preset phase voltage value, is a series inductance value;

[0079] S30, if yes, judging that the series voltage distribution network has an arc ground fault, performing the step of obtaining the series inductance value between the first inductor and the second inductor.

[0080] In the embodiment, for judging whether there is a fault phase in the distribution network, the preset outlet voltage threshold is taken as the criterion. Compared with the traditional outlet voltage threshold, the series inductance value of the first inductor and the second inductor is introduced to determine the outlet voltage threshold in the embodiment, specifically: the product of the series inductance voltage division and 15% phase voltage.

[0081] Judging the outlet voltage of the inverter , and the series inductance value and 15% phase voltage product: if , the line has a ground fault; if , the line has no ground fault.

[0082] Third embodiment

[0083] In order to better illustrate the installation position of the inductor, an optional inductor installation example is provided in the embodiment, referring to Figure 2 the simulation model schematic diagram of the series voltage distribution network with voltage division inductor shown in the figure, the 110kV / 10kV substation has six outgoing lines, there are four overhead lines, L1=8km, L2=24km, L4=16km, L6=12km, and two pure cable lines, L3=16km, L5=15km. Among them, the positive sequence impedance of the overhead line is: R1=0.45Ω / km, L1=1.172mH / km, C1=6.1nF / km, the zero sequence impedance is: R0=0.7Ω / km, L0=3.91mH / km, C0=3.8nF / km; the positive sequence impedance of the cable feeder is: R1=0.075Ω / km, L1=0.254mH / km, C1=318nF / km, the zero sequence impedance is: R0=0.102Ω / km, L0=0.892mH / km, C0=212nF / km. The neutral point of the distribution system is connected to the active arc suppression coil through the first inductor L1 and the second inductor L2 in parallel, and a single-phase arc ground fault is set in the simulation model, the ground resistance is 600 ohms, and the fault point is set at 10km away from the first section bus of the feeder L4.

[0084] Referring to Figure 3The active arc extinction topology is shown. When the switch After the switch is closed, the power distribution network is connected to the arc suppression coil grounding system with the first inductor L1 and the second inductor L2 in series. After detecting the occurrence of a single-phase grounding fault, the switch is closed, the active arc suppression is put into operation, and the inverter control mode of the active arc suppression adopts the method as shown in Figure 4 The double-loop control schematic diagram is shown. In PSCAD, the A-phase arc grounding fault of the L4 feeder occurs at 0.515 s, and the fault duration is 1 s. The fault point current variation diagram of the active arc suppression during the arc grounding fault, the fault phase voltage variation diagram of the active arc suppression during the arc grounding fault, and the neutral point voltage variation diagram of the active arc suppression during the arc grounding fault are obtained respectively as shown in Figures 5-7

[0085] In addition, as an implementation scheme, the voltage regulation device of the isolation inverter is also provided in the embodiment of the present application. The device is applied to a series voltage division type power distribution network including two series-connected first and second inductors. The voltage regulation device of the isolation inverter includes:

[0086] The acquisition module is configured to acquire a series inductance value between the first inductor and the second inductor, and acquire a fault phase voltage, wherein the series inductance value is associated with the capacity of the isolation inverter.

[0087] The outlet voltage regulation module is configured to determine a sum of the series inductance value and the fault phase voltage as a reference voltage, and regulate the outlet voltage of the isolation inverter based on the reference voltage.

[0088] In addition, as an implementation scheme, the arc grounding fault arc suppression device is also provided in the embodiment of the present application. The device is applied to a series voltage division type power distribution network including two series-connected first and second inductors. The arc grounding fault arc suppression device includes:

[0089] The data acquisition module is configured to acquire phase voltage values of each phase in the circuit.

[0090] The fault discrimination and starting module is configured to determine whether the phase voltage values are greater than a preset outlet voltage threshold value. If yes, the series inductance value between the first inductor and the second inductor is acquired, and the fault phase voltage is acquired, wherein the series inductance value is associated with the capacity of the isolation inverter.

[0091] The voltage determination module is configured to determine a sum of the series inductance value and the fault phase voltage as a reference voltage.

[0092] The control module is configured to determine a voltage division value of the reference voltage on the second inductor, and regulate the voltage on the second inductor to the voltage division value or a numerical interval including the voltage division value.​

[0093] In addition, as an implementation solution, Figure 8 The following is a schematic diagram of the hardware running environment of the computer system involved in the embodiment of the present application.

[0094] As Figure 8 shown, the computer system can include a processor 1001, such as a CPU, a memory 1005, a user interface 1003, a network interface 1004, and a communication bus 1002. The communication bus 1002 is used to realize the connection and communication between the components. The user interface 1003 can include a display screen (Display), an input unit such as a keyboard (Keyboard), and can also include a standard wired interface, a wireless interface. The network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a WI-FI interface). The memory 1005 can be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a magnetic disk memory. The memory 1005 can also be a storage device independent of the aforementioned processor 1001.

[0095] Those skilled in the art can understand, Figure 8 The computer system architecture shown in the foregoing merely does not constitute a limitation on the computer system, and can include more or fewer components than the diagram, or combine certain components, or different component arrangements.

[0096] As Figure 8 shown, the memory 1005 as a storage medium can include an operating system, a network communication module, a user interface module, and a computer program. The operating system is a program that manages and controls the hardware and software resources of the computer system, and the running of the computer program and other software or programs.

[0097] In Figure 8 the computer system shown, the user interface 1003 is mainly used to connect the terminal and communicate data with the terminal; the network interface 1004 is mainly used for the background server and communicates data with the background server; and the processor 1001 can be used to call the computer program stored in the memory 1005.

[0098] In the embodiment, the computer system includes a memory 1005, a processor 1001, and a computer program stored on the memory and executable on the processor, wherein:

[0099] When the processor 1001 calls the computer program stored in the memory 1005, the following operations are performed:

[0100] obtaining a series inductance value between the first inductive coil and the second inductive coil, and obtaining a fault phase voltage, wherein the series inductance value is associated with an isolated inverter capacity;

[0101] determining a sum of the series inductance value and the fault phase voltage as a reference voltage, to perform an outlet voltage regulation and / or a fault arc extinction of the isolated inverter based on the reference voltage.

[0102] When the processor 1001 invokes the computer program stored in the memory 1005, the following operations are performed:

[0103] The following expression is satisfied between the series inductance value and the isolated inverter capacity:

[0104]

[0105] In the expression, is the isolated inverter capacity, is an outlet voltage of the isolated inverter, is an output current of the isolated inverter, is the series inductance value.

[0106] When the processor 1001 invokes the computer program stored in the memory 1005, the following operations are performed:

[0107] adjusting a target outlet voltage of the isolated inverter to be equal to the reference voltage; and / or,

[0108] determining a voltage division value of the reference voltage on the first inductive coil or the second inductive coil, and adjusting a voltage on the first inductive coil or the second inductive coil to the voltage division value or a numerical interval including the voltage division value, to zero the fault phase voltage.

[0109] When the processor 1001 invokes the computer program stored in the memory 1005, the following operations are performed:

[0110] acquiring an outlet voltage value in the isolated inverter;

[0111] determining whether the outlet voltage value is greater than a preset outlet voltage threshold value, wherein the preset outlet voltage threshold value is expressed as:

[0112]

[0113] In the expression, is a preset phase voltage value, is the series inductance value;

[0114] If yes, it is judged that the series voltage division type power distribution network has an arc ground fault, and the step of obtaining the series inductance value between the first inductor coil and the second inductor coil is performed.

[0115] In addition, those skilled in the art can understand that all or part of the processes in the method for implementing the above embodiments can be completed by instructing the relevant hardware through a computer program. The computer program includes program instructions, and the computer program can be stored in a storage medium, which is a computer readable storage medium. The program instructions are executed by at least one processor in a computer system to implement the process steps of the above method embodiments.

[0116] Therefore, the application also provides a computer readable storage medium, which stores a computer program. When the computer program is executed by a processor, each step of the arc ground fault arc extinguishing and series voltage division type power distribution network voltage division inductance determination method according to the above embodiments is implemented.

[0117] Among them, the computer readable storage medium can be a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a magnetic disk or an optical disk, and various computer readable storage media that can store program codes.

[0118] It should be noted that the storage medium provided by the embodiments of the application is a storage medium used to implement the method of the embodiments of the application. Therefore, based on the method introduced in the embodiments of the application, those skilled in the art can understand the specific structure and modification of the storage medium, and therefore will not be repeated here. Any storage medium used by the method of the embodiments of the application belongs to the scope of protection of the application.

[0119] Those skilled in the art should understand that the embodiments of the application can be provided as a method, a system or a computer program product. Therefore, the application can be in the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0120] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure One One or more processes and / or boxes Figure One A device that provides the functions specified in one or more boxes.

[0121] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure One One or more processes and / or boxes Figure One The function specified in one or more boxes.

[0122] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure One One or more processes and / or boxes Figure One The steps of the function specified in one or more boxes.

Claims

1. A method for determining the voltage dividing inductance of arc grounding fault arc suppression in a series voltage dividing power distribution network, characterized in that, The series voltage division type power distribution network includes two series connected first and second inductive coils, and the method comprises the following steps: obtaining a series inductance value between the first and second inductive coils, and obtaining a fault phase voltage, wherein the series inductance value is associated with an isolated inverter capacity; determining a sum of the series inductance value and the fault phase voltage as a reference voltage, to regulate an outlet voltage of the isolated inverter and / or to extinguish an arc based on the reference voltage; the series inductance value and the isolated inverter capacity satisfy the following expression: ； wherein is the isolated inverter capacity, is the isolated inverter output voltage, is the isolated inverter output current, is the series inductance value; the step of regulating the outlet voltage of the isolated inverter or extinguishing the arc based on the reference voltage specifically comprises: adjusting the target outlet voltage of the isolated inverter to be equal to the reference voltage; and / or determining a voltage division value of the reference voltage on the first or second inductive coil, and adjusting the voltage on the first or second inductive coil to the voltage division value or a numerical interval including the voltage division value, to zero the fault phase voltage; the step of obtaining the series inductance value between the first and second inductive coils further comprises: collecting an outlet voltage value in the isolated inverter; determining whether the exit voltage value is greater than a preset exit voltage threshold, wherein the preset exit voltage threshold is expressed as: ； In the formula, is a preset phase voltage value, is a series inductance value; if yes, determining that the series voltage division type power distribution network has an arc ground fault, and executing the step of obtaining the series inductance value between the first and second inductive coils.

2. A voltage regulating device for isolating an inverter, applying the method as claimed in claim 1, characterized in that, The voltage regulating device of the isolated inverter applied to the series voltage division type power distribution network including two series connected first and second inductive coils comprises: a collection module for obtaining a series inductance value between the first and second inductive coils, and obtaining a fault phase voltage, wherein the series inductance value is associated with an isolated inverter capacity; an outlet voltage regulating module for determining a sum of the series inductance value and the fault phase voltage as a reference voltage, to regulate an outlet voltage of the isolated inverter based on the reference voltage.

3. An arc ground fault arc suppression device employing the method of claim 1, wherein, The arc ground fault arc extinguishing device applied to the series voltage division type power distribution network including two series connected first and second inductive coils comprises: a data collection module for collecting phase voltage values of each phase in a circuit; a fault discrimination starting module for determining whether the phase voltage values are greater than a preset outlet voltage threshold value, and if yes, obtaining a series inductance value between the first and second inductive coils, and obtaining a fault phase voltage, wherein the series inductance value is associated with an isolated inverter capacity; a voltage determination module for determining a sum of the series inductance value and the fault phase voltage as a reference voltage; a control module for determining a voltage division value of the reference voltage on the first or second inductive coil, and adjusting the voltage on the first or second inductive coil to the voltage division value or a numerical interval including the voltage division value.

4. A computer system, characterized by The computer system comprises a memory, a processor, and a computer program stored on the memory and capable of running on the processor, and the computer program, when executed by the processor, implements the steps of the arc grounding fault arc extinction voltage dividing inductor determination method for a series voltage dividing power distribution network according to claim 1.

5. A computer readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the arc grounding fault arc extinction voltage dividing inductor determination method for a series voltage dividing power distribution network according to claim 1.

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