A method and system for preventing islanding in microgrids based on real-time topology identification

Abstract

This invention discloses a microgrid group anti-islanding protection method and system based on real-time topology identification. The method includes real-time topology identification of the microgrid group based on the operating status of the grid connection point switches and the operating status of switches within the microgrid group; anti-islanding protection of the microgrid group based on the anti-islanding protection action status of the grid connection point; and adaptive renetworking of the microgrid group after unplanned islanding. This invention improves the adaptability of microgrid group anti-islanding protection to different operating modes and different grid structures by real-time transmission and sharing of the microgrid group networking mode and the anti-islanding protection action status of each grid connection point, thereby enhancing the sensitivity and speed of microgrid group anti-islanding protection and achieving greater flexibility and reliability in microgrid group operation.

Description

Technical Field

[0001] This invention relates to a microgrid group anti-islanding protection method based on real-time topology identification, belonging to the field of power system relay protection technology. Background Technology

[0002] As the penetration rate of different types of distributed power sources, such as grid-connected and grid-structured, continues to increase, the operation mode of independent microgrids connected to the grid through a single connection point is gradually unable to meet the operation requirements of new distribution networks with changing operating modes and diverse load forms. Therefore, microgrid groups formed by interconnecting multiple adjacent microgrids have become a development trend, with features such as flexible power supply mode and strong anti-interference capability.

[0003] However, in the actual operation of microgrids, unplanned islanding frequently occurs due to the intermittent and fluctuating output of distributed power sources and the dynamic changes in the grid topology. Islanding refers to a situation where a part of the grid is disconnected from the main grid, but the distributed power sources within that part continue to supply power, forming an isolated power system. For unplanned islanding, due to the loss of support and regulation from the main grid, parameters such as frequency and voltage of the microgrid are prone to fluctuations, which can even lead to equipment damage and power outages. Therefore, it is necessary to adopt fast and accurate protection strategies to accurately isolate faults, identify the islanding status of the microgrid, quickly disconnect distributed power source connections, and coordinate with reclosing to ensure power supply to critical loads.

[0004] Existing anti-islanding protection methods can be categorized into passive detection methods, active detection methods, and communication-based methods. Passive detection methods identify microgrid islanding by detecting voltage, frequency, or phase changes at the grid connection point. However, they suffer from detection dead zones in microgrid islanding scenarios with high distributed generation penetration and near-zero grid connection power. Active detection methods detect changes in voltage, frequency, and impedance in the system by actively outputting disturbance signals to determine the microgrid islanding status. However, for microgrids with multiple distributed generation sources, the interference signals from different sources can cancel each other out, causing anti-islanding protection to fail, making implementation difficult. Furthermore, the presence of interference signals degrades power quality. Communication-based methods directly send trip signals to downstream distributed generation sources based on the grid connection point's on / off status. This type of method relies on reliable communication channels and requires a centralized control device to monitor the on / off status of multiple downstream grid connection points in real time, resulting in relatively slow response times. Therefore, it is necessary to develop reasonable and feasible communication schemes based on the islanding characteristics of microgrid groups and considering the real-time topology of the microgrid to improve the reliability and efficiency of microgrid group anti-islanding protection. Summary of the Invention

[0005] To address the shortcomings in sensitivity and reliability of existing microgrid anti-islanding protection methods, this invention provides a microgrid anti-islanding protection method based on real-time topology identification. This method adapts to the anti-islanding protection needs of microgrids under different operating modes and grid structures, thereby enhancing the flexibility and reliability of microgrid operation.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In one aspect, this invention provides a method for preventing microgrid islanding based on real-time topology identification, comprising the following:

[0008] Based on the operating status of the grid connection point switch and the operating status of the switches within the microgrid group, real-time topology identification of the microgrid group is achieved through the transmission of the sub-microgrid grid connection model.

[0009] Microgrid anti-islanding protection is implemented based on the action status of the grid connection point anti-islanding protection and the real-time topology of the microgrid group.

[0010] After the microgrid group's islanding protection is activated, the microgrid group is re-networked after unplanned islanding through the interconnection switch.

[0011] More preferably,

[0012] The real-time topology of the microgrid group includes the networking and connection methods of each sub-microgrid; when the interconnection switch between multiple sub-microgrids is in the closed position, it is determined that multiple sub-microgrids are operating in a network; when the interconnection switch between a certain sub-microgrid and other sub-microgrids is in the open position, it is determined that the sub-microgrid is operating independently.

[0013] More preferably,

[0014] If a sub-microgrid's grid connection switch is in the closed position, the sub-microgrid's grid connection model will be constructed based on the grid connection point switch number and the anti-islanding protection operation status. This model will then be transmitted to adjacent switches level by level through horizontal communication links. After transmission and aggregation, the grid connection models of each sub-microgrid in network operation will be obtained.

[0015] More preferably,

[0016] The method for relaying information from one horizontal communication link to an adjacent switch is as follows:

[0017] When the switches within the microgrid group are in a closed or flowing state, the received grid connection model will be merged, and an attempt will be made to broadcast it to adjacent switches.

[0018] More preferably,

[0019] The topology range of the sub-microgrids is adjusted in real time based on the operating status of the switches within the microgrid group, and the interconnection switches between the corresponding sub-microgrids are re-determined after the adjustment.

[0020] More preferably,

[0021] When any grid connection point activates its anti-islanding protection, it will trigger the connection to other grid connection points in each sub-micronet of the microgrid group in conjunction with the real-time topology of the microgrid group.

[0022] More preferably,

[0023] The grid connection point switch that activates the anti-islanding protection identifies the received grid connection model in real time. If there are other grid connection point switch numbers besides this switch number, it determines other grid connection points in the microgrid group based on the other grid connection point switch numbers. When the anti-islanding protection of this switch activates, it immediately sends a trip command to other grid connection points.

[0024] More preferably,

[0025] The renetworking method for microgrids after unplanned islanding is as follows:

[0026] After all the anti-islanding protection points of the microgrid are activated, if the tie switch receives a notification that the anti-islanding protection status in any microgrid grid connection model has been triggered, it will immediately start checking synchronization or checking no-voltage reclosing to realize the re-networking of the microgrid group after unplanned islanding.

[0027] In another aspect, the present invention discloses a microgrid anti-islanding protection system based on real-time topology identification, which is based on the aforementioned microgrid anti-islanding protection method, including a microgrid real-time topology identification module, a microgrid anti-islanding protection module, and a microgrid renetworking module;

[0028] The microgrid group real-time topology identification module identifies the microgrid group's real-time topology based on the operating status of the grid connection point switch and the operating status of the switches within the microgrid group, through the transmission of the sub-microgrid grid connection model.

[0029] The microgrid anti-islanding protection module performs microgrid anti-islanding protection based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid.

[0030] The microgrid renetworking module renetworks the microgrid after the anti-islanding protection of the microgrid is activated, through the tie switch.

[0031] The present invention also discloses an electronic device, including a processor and a storage medium; characterized in that:

[0032] The storage medium is used to store instructions;

[0033] The processor is configured to operate according to the instructions to perform the steps of the aforementioned microgrid cluster anti-islanding protection method.

[0034] A computer-readable storage medium having a computer program stored thereon, characterized in that the program processes the steps of the aforementioned microgrid group anti-islanding protection method.

[0035] Compared with existing technologies, the beneficial effects achieved by the invention are:

[0036] 1. The anti-islanding protection method based on real-time topology identification of microgrid groups provided by this invention improves the adaptability of microgrid anti-islanding protection to different operating modes and different grid structures, and improves the sensitivity and speed of microgrid anti-islanding protection.

[0037] 2. The renetworking method after unplanned islanding provided by this invention enhances the flexibility and reliability of microgrid operation. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the microgrid group anti-islanding protection process based on real-time topology identification according to the present invention;

[0039] Figure 2 This is a schematic diagram of a microgrid cluster system provided in an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0041] This invention discloses a microgrid group anti-islanding protection method based on real-time topology identification. The overall logic diagram is shown in the attached diagram. Figure 1 This includes the following:

[0042] Step 1: Based on the operating status of the grid connection point switch and the operating status of the switches within the microgrid group, perform real-time topology identification of the microgrid group through the transmission of the sub-microgrid grid connection model;

[0043] The real-time topology of the microgrid group includes the networking and connection modes of each sub-microgrid. When the interconnection switches between multiple sub-microgrids are in the closed position, it is determined that the multiple sub-microgrids are operating in a networked manner. When the interconnection switches between a sub-microgrid and other sub-microgrids are all in the open position, it is determined that the sub-microgrid is operating independently. When the connection switch of an independently operating sub-microgrid is closed, it is determined that the sub-microgrid is operating in a connected mode; otherwise, it is operating in an offline mode. When any connection switch of multiple networked sub-microgrids is closed, it is determined that the multiple networked sub-microgrids are operating in a connected mode; otherwise, it is operating in an offline mode.

[0044] If a sub-microgrid's grid-connected switch is in the closed position, a grid-connected model for that sub-microgrid will be constructed based on the grid-connected switch number and the anti-islanding protection's operating status. This model will then be transmitted step-by-step to adjacent switches via the horizontal communication link. If an adjacent switch is in the closed / current-carrying state, the received grid-connected models will be merged and transmitted to the next adjacent switch. This process of transmission and aggregation yields the grid-connected models for each sub-microgrid in operation. The method for transmitting these models step-by-step to adjacent switches via the horizontal communication link is as follows:

[0045] When the switches in the microgrid group are in a closed or flowing state, the received grid connection model will be merged and an attempt will be made to broadcast it to adjacent switches.

[0046] The topology range of the sub-microgrids is adjusted in real time based on the operating status of the switches within the microgrid group, and the interconnection switches between the corresponding sub-microgrids are re-determined after the adjustment.

[0047] Step 2: Perform microgrid anti-islanding protection based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid group;

[0048] When any grid connection point activates its anti-islanding protection, based on the real-time topology of the microgrid group and other grid connection points in each sub-microgrid operating in a connected network, the method for identifying other grid connection points is as follows:

[0049] The grid connection point switch that activates the anti-islanding protection identifies the received grid connection model in real time. If there are other grid connection point switch numbers besides this switch number, it determines other grid connection points in the microgrid group based on the other grid connection point switch numbers. When the anti-islanding protection of this switch activates, it immediately sends a trip command to other grid connection points.

[0050] Step 3: After the microgrid group anti-islanding protection is activated, the microgrid group is re-networked after unplanned islanding through the interconnection switch.

[0051] The renetworking method for microgrids after unplanned islanding is as follows:

[0052] After all the anti-islanding protection points of the microgrid are activated, if the tie switch receives a notification that the anti-islanding protection status in any microgrid grid connection model has been triggered, it will immediately start checking synchronization or checking no-voltage reclosing to realize the re-networking of the microgrid group after unplanned islanding.

[0053] It should be noted that, in the preferred embodiment of the present invention, when the tie switch is in the open position, the function of the signal path receiving model is not affected, but the received grid connection model will no longer be merged.

[0054] The present invention also discloses a microgrid anti-islanding protection system based on real-time topology identification based on the aforementioned microgrid anti-islanding protection method, including a microgrid real-time topology identification module, a microgrid anti-islanding protection module, and a microgrid renetworking module;

[0055] The microgrid group real-time topology identification module identifies the microgrid group's real-time topology based on the operating status of the grid connection point switch and the operating status of the switches within the microgrid group, through the transmission of the sub-microgrid grid connection model.

[0056] The microgrid anti-islanding protection module performs microgrid anti-islanding protection based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid.

[0057] The microgrid renetworking module renetworks the microgrid after the anti-islanding protection of the microgrid is activated, through the tie switch.

[0058] Example 1:

[0059] With attachment Figure 2 Using the illustrated microgrid system diagram as an example, this invention provides a detailed explanation of a microgrid anti-islanding protection method based on real-time topology identification. This method can adapt to the anti-islanding protection needs of microgrids under different operating modes and grid structures, enhancing the flexibility and reliability of microgrid operation. Specifically, it consists of the following three parts:

[0060] Part 1: Real-time topology identification of microgrid groups based on the operating status of grid-connected switches, the operating status of switches within each microgrid, and the operating status of interconnection switches between microgrid groups.

[0061] The real-time topology of the microgrid group includes the networking and connection methods of each sub-microgrid. If the connection switch is in the closed position, the connection model of the sub-microgrid will be constructed based on the connection point switch number and the anti-islanding protection operation status, and transmitted to adjacent switches level by level through the horizontal communication link. That is, when the switches in the microgrid group are in the closed or current-carrying state, the received connection model will be merged and an attempt will be made to broadcast it to adjacent switches. (See attached diagram for details.) Figure 2 The schematic diagram of the microgrid group system is as follows:

[0062] This invention determines the networking mode between microgrid groups based on the on / off position of the line switches. PCC1, PCC2, and PCC3 are the grid connection point switches for the three sub-microgrids, and F1 and F2 are the interconnection switches between the sub-microgrids.

[0063] Assume that all other line switches and PCC1, PCC2, and PCC3 in the system are closed. When tie switches F1 and F2 are open, the three sub-microgrids operate independently; when F1 and F2 are closed, the three sub-microgrids operate as a network; when F1 is closed and F2 is open, microgrid 1 and microgrid 2 operate as a network, and microgrid 3 operates independently; when F1 is open and F2 is closed, microgrid 2 and microgrid 3 operate as a network, and microgrid 1 operates independently.

[0064] This invention determines the microgrid's networking mode based on the opening and closing status of PCC points. Specifically, for the above-mentioned scenario of F1 being closed and F2 being open, i.e., the networking operation scenario of microgrids 1 and 2, the networking model of PCC1 switch in microgrid 1 is [PCC1, anti-islanding not activated], the networking model of PCC2 switch is [PCC2, anti-islanding not activated], and the networking model of PCC3 switch is [PCC3, anti-islanding not activated]. Each grid connection point broadcasts its own grid connection model to the adjacent switches. Since F1, F3~F22 are all in the closed state, the PCC1 and PCC2 grid connection models can be transmitted and exchanged step by step through F10, F7, F1, and F15 (the part with dotted line 1). Therefore, the final grid connection models of PCC1 and PCC2 are both [PCC1, anti-islanding not activated] and [PCC2, anti-islanding not activated]. That is, the grid connection points for the networking operation of microgrids 1 and 2 are PCC1 and PCC2.

[0065] It should be noted that in the real-time topology identification of the microgrid group in this invention, the topology range of the sub-microgrids is adjusted in real time according to the operating status of the switches within the microgrid group, and the interconnecting switches between the corresponding sub-microgrids are re-determined after the adjustment. For example, if F10 is disconnected, the operating mode of microgrid 1 will be adjusted to be networked by F11 alone, and the operating mode of microgrid 2 will be combined with F3~F9, with F10 serving as a new interconnecting switch. If F7 is disconnected, the operating mode of microgrid 1 will be adjusted to be networked by F8~F11, and the operating mode of microgrid 2 will be combined with F3~F6, with F7 serving as a new interconnecting switch.

[0066] Part Two: Microgrid Group Anti-Islanding Protection Based on the Operation Status of Anti-Islanding Protection at Grid Connection Points. Microgrid group anti-islanding protection refers to a series of protection logic steps that trip the anti-islanding protection at each grid connection point when unplanned islanding occurs.

[0067] When the anti-islanding protection of any grid connection point is activated, it will trip other grid connection points in the microgrid. The method for identifying other grid connection points is as follows: The grid connection point switch identifies the received grid connection model in real time. If there are other grid connection point switch numbers besides the one in this switch number, then they are other grid connection points. When the anti-islanding protection of this switch is activated, it immediately sends a trip command to other grid connection points.

[0068] The specifics still need to be combined Figure 2 The explanation of the K-point fault is as follows: if F1 is in the closed position and F2 is in the open position, the real-time topology of the system clearly shows that micronets 1 and 2 are operating in a network configuration, while micronet 3 is operating independently in parallel. When the K-point fault causes the anti-islanding protection of PCC1 to activate, since PCC1 has already received the parallel model from PCC2, it will directly jump to the other parallel point PCC2.

[0069] Part Three: Adaptive Reorganization of Microgrid Groups After Unplanned Islanding. Microgrid group reorganization includes switching each independently operating sub-microgrid to network operation. After all grid-connected points of the microgrid activate their anti-islanding protection, if the tie switch receives a notification that the anti-islanding protection activation status in any microgrid grid-connection model has been triggered, it immediately initiates synchronization detection or no-voltage reclosing detection to achieve microgrid group reorganization after unplanned islanding.

[0070] Specifically, in the scenario of F1 combining and F2 separating, when Figure 2 A fault occurs at point K. PCC1 trips and PCC2 trips in conjunction with it. Simultaneously, line switch F10 trips. When F2 is in the open position, the function based on the signal path receiving model is not affected; it simply stops merging the received grid-connected models. That is, PCC3 will not merge the grid-connected models of PCC1 and PCC2. At this time, tie switch F2 receives the grid-connected model [PCC1, anti-islanding action] (dashed line 2), immediately triggering tie switch F2 to check synchronization or check no-voltage reclosing, which can reconnect microgrid 1, microgrid 2, and microgrid 3. After the anti-islanding action, PCC1 and F10 trip, and PCC2 trips in conjunction with it. Tie switch F2 receives the anti-islanding action check no-voltage reclosing. At this time, microgrid 1, microgrid 2, and microgrid 3 complete reconnection. Before regenerating the grid-connected model, the relevant action signals will be reset. Therefore, the new tie switch F10 will not receive the anti-islanding action signal [PCC1, anti-islanding action], and will not perform no-voltage reclosing. The renetworking method of the present invention can ensure that in the event of a permanent fault at point K, only the load belonging to F11 loses power, thus ensuring the power supply reliability of the multi-microgrid group load.

[0071] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0072] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0073] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0074] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for preventing islanding in microgrid groups based on real-time topology identification, characterized in that, Includes the following: Based on the operating status of the grid connection point switch and the operating status of the switches within the microgrid group, real-time topology identification of the microgrid group is achieved through the transmission of the sub-microgrid grid connection model. If a sub-microgrid grid connection switch is in the closed position, the sub-microgrid grid connection model is constructed based on the grid connection point switch number and the anti-islanding protection action status, and is transmitted to adjacent switches level by level through the horizontal communication link. After transmission and aggregation, the grid connection models of each sub-microgrid in network operation are obtained. Microgrid anti-islanding protection is performed based on the action status of the grid connection point anti-islanding protection and the real-time topology of the microgrid group. The grid connection point switch that is activated by the anti-islanding protection identifies the received grid connection model in real time. If there are other grid connection point switch numbers besides the current switch number, the other grid connection points of the microgrid group are determined based on the other grid connection point switch numbers. When the anti-islanding protection of this switch is activated, it immediately sends a trip command to other grid-connected points; After the microgrid group's islanding protection is activated, the microgrid group is re-networked after unplanned islanding through the interconnection switch.

2. The microgrid group anti-islanding protection method based on real-time topology identification according to claim 1, characterized in that: The real-time topology of the microgrid group includes the networking and connection methods of each sub-microgrid; when the interconnection switch between multiple sub-microgrids is in the closed position, it is determined that multiple sub-microgrids are operating in a network; when the interconnection switch between a certain sub-microgrid and other sub-microgrids is in the open position, it is determined that the sub-microgrid is operating independently.

3. The microgrid group anti-islanding protection method based on real-time topology identification according to claim 1, characterized in that: The method for relaying communication links to adjacent switches step by step is as follows: When the switches within the microgrid group are in a closed or current-carrying state, the received grid connection models are merged and broadcast to adjacent switches.

4. The microgrid group anti-islanding protection method based on real-time topology identification according to claim 2 or 3, characterized in that: The topology range of the sub-microgrids is adjusted in real time based on the operating status of the switches within the microgrid group, and the interconnection switches between the corresponding sub-microgrids are re-determined after the adjustment.

5. The microgrid group anti-islanding protection method based on real-time topology identification according to claim 1, characterized in that: When any grid connection point activates its anti-islanding protection, it will trigger the connection to other grid connection points in each sub-micronet of the microgrid group in conjunction with the real-time topology of the microgrid group.

6. The microgrid group anti-islanding protection method based on real-time topology identification according to claim 1, characterized in that: The renetworking method for microgrids after unplanned islanding is as follows: After all the anti-islanding protection points of the microgrid are activated, if the tie switch receives a notification that the anti-islanding protection status in any sub-microgrid grid connection model has been triggered, it will immediately start checking synchronization or checking no-voltage reclosing to realize the re-networking of the microgrid group after unplanned islanding.

7. A microgrid anti-islanding protection system based on real-time topology identification, based on the microgrid anti-islanding protection method according to any one of claims 1-6, comprising a microgrid real-time topology identification module, a microgrid anti-islanding protection module, and a microgrid renetworking module, characterized in that: The microgrid group real-time topology identification module identifies the microgrid group's real-time topology based on the operating status of the grid connection point switch and the operating status of the switches within the microgrid group, through the transmission of the sub-microgrid grid connection model. The microgrid anti-islanding protection module performs microgrid anti-islanding protection based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid. The microgrid renetworking module renetworks the microgrid after the anti-islanding protection of the microgrid is activated, through the tie switch.

8. An electronic device, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The procedure is used to process the steps of the method according to any one of claims 1-6.

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