Micro-grid group anti-islanding protection method and system based on real-time topology identification

Abstract

The invention discloses a real-time topology identification-based micro-grid group anti-islanding protection method and system. The method comprises the steps of carrying out micro-grid group real-time topology identification based on a grid-connected point switch operation state and a micro-grid group inner switch operation state; and performing micro-grid group anti-islanding protection and micro-grid group self-adaptive re-networking after non-planed islanding based on the grid-connected point anti-islanding protection action state. According to the invention, based on the real-time transmission and sharing of the micro-grid group networking mode and the anti-islanding protection action state of each grid-connected point, the adaptability of micro-grid group anti-islanding protection to different operation modes and different grid structures is improved, the sensitivity and rapidity of micro-grid group anti-islanding protection are improved, and the flexibility and reliability of micro-grid group operation are realized.

Description

Technical Field

[0001] The present invention relates to a microgrid anti-islanding protection method based on real-time topology identification, and belongs to the technical field of power system relay protection. Background Art

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

[0003] However, in the actual operation of microgrids, unplanned islanding often occurs due to the intermittent and fluctuating output of distributed generation (DGs) and the dynamic changes in grid topology. Islanding occurs when a portion of a power grid is disconnected from the main grid, but the DGs within that portion continue to supply power, forming an isolated power system. Unplanned islanding, due to the loss of support and regulation from the main grid, can easily cause fluctuations in parameters such as the frequency and voltage of the microgrid, potentially leading to equipment damage and power outages. Therefore, it is necessary to implement fast and precise protection strategies to accurately isolate faults, identify microgrid islanding conditions, rapidly disconnect DG connection points, and coordinate reclosing to ensure power supply to critical loads.

[0004] Existing anti-islanding protection methods can be categorized as passive detection, active detection, and communication-based methods. Passive detection methods identify microgrid islanding by detecting sudden changes in voltage, frequency, or phase at the grid connection point. However, this method suffers from detection blind spots in microgrid islanding scenarios with high DG 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's islanding status. However, in microgrids with multiple DGs, the interference signals from different DGs can cancel each other, rendering anti-islanding protection ineffective. This makes implementation difficult. Furthermore, the presence of interference signals can degrade power quality. Communication-based methods directly send trip signals to downstream DGs based on the on / off status of the microgrid's grid connection point. These methods rely on reliable communication channels and require a centralized control device to monitor the disconnection status of multiple downstream grid connection points in real time, resulting in relatively slow response times. Therefore, it is necessary to develop a reasonable and feasible communication solution based on the islanding characteristics of microgrid clusters and their real-time topology to improve the reliability and efficiency of anti-islanding protection in microgrid clusters. Summary of the Invention

[0005] In order to solve the shortcomings of the existing sensitivity and reliability of microgrid anti-islanding protection, the present invention provides a microgrid anti-islanding protection method based on real-time topology identification to adapt to the anti-islanding protection needs of microgrids under different operating modes and different grid structures, and enhance the flexibility and reliability of microgrid operation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: In one aspect, the present invention provides a microgrid anti-islanding protection method based on real-time topology identification, comprising the following contents: Based on the operating status of the switches at the grid connection point and the operating status of the switches within the microgrid, the real-time topology identification of the microgrid group is carried out by transferring the sub-microgrid grid connection model; Based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid group, the anti-islanding protection of the microgrid group is carried out; After the anti-islanding protection of the microgrid group is activated, the microgrid group after unplanned islanding is re-networked through the tie switch.

[0007] More preferably, The real-time topology of the microgrid group includes the networking mode and grid connection mode of each sub-microgrid; when the interconnecting switches between multiple sub-microgrids are in the closed position, the multiple sub-microgrids are judged to be networked and operating; when the interconnecting switches of a sub-microgrid and other sub-microgrids are all in the open position, the sub-microgrid is judged to be operating independently.

[0008] More preferably, If the grid-connected switch of a sub-microgrid is in the closed state, the grid-connected model of the sub-microgrid will be constructed based on the grid-connected switch sequence number and the anti-islanding protection action status, and will be transmitted step by step to the adjacent switches through the horizontal communication link. After transmission and aggregation, the grid-connected models of each sub-microgrid in network operation will be obtained.

[0009] More preferably, The method of transmitting the horizontal communication link to the adjacent switches step by step is as follows: When the switches in the microgrid are in a closed or flowing state, the received grid-connected models will be merged and broadcast to the adjacent switches.

[0010] More preferably, The topology range of the sub-microgrid is adjusted in real time according to the operating status of the switches in the microgrid group, and the interconnecting switches between the corresponding sub-microgrids after the adjustment are re-determined.

[0011] More preferably, When the anti-islanding protection is activated at any grid-connected point, the other grid-connected points of each sub-microgrid in the network will be linked together in combination with the real-time topology of the microgrid group.

[0012] More preferably, The grid connection point switch in anti-islanding protection action identifies the received grid connection model in real time. If there are other grid connection point switch numbers besides this switch number, the other grid connection points of the microgrid group are judged according to the switch numbers of other grid connection points. When the anti-islanding protection of this switch is activated, a joint trip command is immediately sent to other grid connection points.

[0013] More preferably, The method for re-networking a microgrid group after an unplanned islanding is as follows: After the anti-islanding protection of all microgrid grid-connected points is activated, if the tie switch receives a signal that the anti-islanding protection action status in any microgrid grid-connected model is triggered, it will immediately start synchronization check or voltage-free reclosing check to achieve re-networking of the microgrid group after unplanned islanding.

[0014] On the other hand, the present invention discloses a microgrid anti-islanding protection system based on real-time topology identification based on the aforementioned microgrid anti-islanding protection method, comprising a microgrid real-time topology identification module, a microgrid anti-islanding protection module and a microgrid re-networking module; The microgrid cluster real-time topology identification module performs real-time topology identification of the microgrid cluster by transferring the sub-microgrid grid connection model based on the operating status of the switch at the grid connection point and the operating status of the switches within the microgrid cluster; Microgrid anti-islanding protection module, which performs anti-islanding protection for the microgrid based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid; The microgrid group re-networking module re-networks the microgrid group after unplanned islanding through the tie switch after the microgrid group anti-islanding protection is activated.

[0015] The present invention also discloses an electronic device, comprising a processor and a storage medium; the characteristics of the electronic device are: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the aforementioned microgrid anti-islanding protection method.

[0016] A computer-readable storage medium having a computer program stored thereon, characterized in that the program is used to process the steps of the aforementioned microgrid anti-islanding protection method.

[0017] Compared with the prior art, the invention has the following beneficial effects: 1. The anti-islanding protection method based on real-time topology identification of microgrid clusters provided by the present 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; 2. The re-networking method after unplanned islanding provided by the present invention enhances the flexibility and reliability of microgrid operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the anti-islanding protection process of a microgrid group based on real-time topology identification of the present invention; Figure 2 This is a schematic diagram of a microgrid system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The present invention discloses a microgrid anti-islanding protection method based on real-time topology recognition. The overall logic diagram can be seen in the attached Figure 1 , including the following: Step 1: Based on the operating status of the switches at the grid connection point and the operating status of the switches within the microgrid, the real-time topology of the microgrid is identified by transferring the sub-microgrid grid connection model; The real-time topology of the microgrid group includes the networking mode and grid-connected mode of each sub-microgrid. When the interconnecting switches between multiple sub-microgrids are in the closed position, the multiple sub-microgrids are determined to be in networked operation. When the interconnecting switches of a sub-microgrid and the other sub-microgrids are all in the open position, the sub-microgrid is determined to be operating independently. When the grid-connected switch of an independently operating sub-microgrid is closed, the sub-microgrid is determined to be operating in grid-connected mode; otherwise, it is in off-grid mode. When any of the grid-connected switches of the multiple networked sub-microgrids is closed, the multiple networked sub-microgrids are determined to be operating in grid-connected mode; otherwise, they are in off-grid mode.

[0021] If a sub-microgrid grid-connected switch is in the closed state, the sub-microgrid grid-connected model will be constructed based on the grid-connected switch sequence number and anti-islanding protection action state, and will be transmitted step by step to the adjacent switches through the horizontal communication link. If the adjacent switch is in the closed / current state, the received grid-connected model will be merged and continued to be transmitted to the next adjacent switch. After transmission and aggregation, the grid-connected models of each sub-microgrid in network operation are obtained. The method of transmitting the horizontal communication link to the adjacent switches step by step is as follows: When the switches in the microgrid are in a closed or flowing state, the received grid-connected models will be merged and broadcast to the adjacent switches.

[0022] The topology range of the sub-microgrid is adjusted in real time according to the operating status of the switches in the microgrid group, and the interconnecting switches between the corresponding sub-microgrids after the adjustment are re-determined.

[0023] Step 2: Perform anti-islanding protection for the microgrid based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid. When the anti-islanding protection is activated at any grid connection point, the real-time topology of the microgrid group is combined with the other grid connection points of each sub-microgrid in the network operation. The method for identifying other grid connection points is as follows: The grid connection point switch in anti-islanding protection action identifies the received grid connection model in real time. If there are other grid connection point switch numbers besides this switch number, the other grid connection points of the microgrid group are judged according to the switch numbers of other grid connection points. When the anti-islanding protection of this switch is activated, a joint trip command is immediately sent to other grid connection points.

[0024] Step 3: After the anti-islanding protection of the microgrid group is activated, the microgrid group after unplanned islanding is re-networked through the tie switch.

[0025] The method for re-networking a microgrid group after an unplanned islanding is as follows: After the anti-islanding protection of all microgrid grid-connected points is activated, if the tie switch receives a signal that the anti-islanding protection action status in any microgrid grid-connected model is triggered, it will immediately start synchronization check or voltage-free reclosing check to achieve re-networking of the microgrid group after unplanned islanding.

[0026] It should be noted that, in a preferred embodiment of the present invention, when the tie switch is in the open position, the function of receiving the model based on the signal path is not affected, but the received grid-connected model will no longer be merged.

[0027] 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, comprising a microgrid real-time topology identification module, a microgrid anti-islanding protection module and a microgrid re-networking module; The microgrid cluster real-time topology identification module performs real-time topology identification of the microgrid cluster by transferring the sub-microgrid grid connection model based on the operating status of the switch at the grid connection point and the operating status of the switches within the microgrid cluster; Microgrid anti-islanding protection module, which performs anti-islanding protection for the microgrid based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid; The microgrid group re-networking module re-networks the microgrid group after unplanned islanding through the tie switch after the microgrid group anti-islanding protection is activated.

[0028] Example 1: Attach Figure 2 Taking the microgrid system diagram shown as an example, this paper introduces in detail a microgrid anti-islanding protection method based on real-time topology identification provided by the present invention. The microgrid anti-islanding protection method of the present invention can adapt to the anti-islanding protection requirements of microgrids under different operating modes and different grid structures, enhancing the flexibility and reliability of microgrid operation. It is specifically divided into the following three parts: Part 1: Real-time topology identification of microgrid clusters 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 clusters.

[0029] The real-time topology of the microgrid group includes the networking and grid connection methods of each sub-microgrid. If the grid-connected switch is in the closed state, the grid-connected model of the sub-microgrid will be constructed based on the grid-connected switch sequence number and anti-islanding protection action state, and will be transmitted to the adjacent switches step by step through the horizontal communication link. That is, when the switches in the microgrid group are in the closed or flowing state, the received grid-connected models will be merged and broadcast to the adjacent switches. Figure 2 The schematic diagram of the microgrid group system is as follows: The present invention determines the networking mode between microgrid groups based on the open and closed positions of the circuit switches. PCC1, PCC2, and PCC3 are the connection point switches of the three sub-microgrids respectively, and F1 and F2 are the tie switches between the sub-microgrids.

[0030] Assume that all other circuit breakers in the system, as well as PCC1, PCC2, and PCC3, 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, microgrids 1 and 2 operate as a network, while microgrid 3 operates independently. When F1 is open and F2 is closed, microgrids 2 and 3 operate as a network, while microgrid 1 operates independently.

[0031] The present invention determines the microgrid's networking mode based on the open / closed state of the PCC points. Specifically, for the aforementioned F1 closed and F2 open scenarios, i.e., the networking operation scenarios of microgrids 1 and 2, the networking model of PCC1 in microgrid 1 is [PCC1, anti-islanding inactive], the networking model of PCC2 is [PCC2, anti-islanding inactive], and the networking model of PCC3 is [PCC3, anti-islanding inactive]. Each grid connection point broadcasts its own grid connection model to adjacent switches. Since F1 and F3-F22 are all closed, the PCC1 and PCC2 grid connection models can be transmitted and exchanged step by step through F10, F7, F1, and F15 (dashed line 1). Therefore, the grid connection models ultimately aggregated by PCC1 and PCC2 are both [PCC1, anti-islanding inactive] and [PCC2, anti-islanding inactive]. That is, the grid connection points for the networking operation of microgrids 1 and 2 are PCC1 and PCC2.

[0032] It should be noted that in the present invention's real-time microgrid cluster topology identification, the sub-microgrid topology range is adjusted in real time based on the operating status of switches within the microgrid cluster, and the tie switches between the corresponding sub-microgrids are redefined after the adjustments. For example, if F10 is disconnected, the operation mode of microgrid 1 will be adjusted to a single network consisting of F11. The operation mode of microgrid 2 will be combined with F3-F9, with F10 serving as the new tie switch. If F7 is disconnected, the operation mode of microgrid 1 will be adjusted to a network consisting of F8-F11. The operation mode of microgrid 2 will be combined with F3-F6, with F7 serving as the new tie switch.

[0033] Part 2: Microgrid anti-islanding protection based on the anti-islanding protection action status of the grid connection point. Microgrid anti-islanding protection refers to a series of protection logics that trip the anti-islanding protection of each grid connection point when unplanned islanding occurs.

[0034] When anti-islanding protection is activated at any grid-connected point, it will trigger a trip to the other grid-connected points in the microgrid. The method for identifying these other grid-connected points is as follows: the grid-connected point switch recognizes the received grid-connected model in real time. If there are other grid-connected point switch numbers besides the current switch number, these are the other grid-connected points. When anti-islanding protection is activated on this switch, it immediately sends a trip command to the other grid-connected points.

[0035] Still combined with specific Figure 2 In the K-point fault diagram, if F1 is closed and F2 is open, the system's real-time topology clearly indicates that microgrids 1 and 2 operate in a networked manner, while microgrid 3 operates independently. If a K-point fault triggers PCC1's anti-islanding protection, PCC1 will directly connect to the other interconnection point, PCC2, because it has received the interconnection model of PCC2.

[0036] Part 3: Adaptive Re-networking of Microgrid Clusters After Unplanned Islanding. This re-networking involves switching each independently operating sub-microgrid to networked operation. After anti-islanding protection is activated at all microgrid interconnection points, if the tie switch receives a triggering of anti-islanding protection in any microgrid interconnection model, it immediately initiates synchronization check or voltage-free reclosing, achieving re-networking of the microgrid cluster after unplanned islanding.

[0037] Specifically, in the F1 combined and F2 divided operation scenario, when Figure 2 A fault occurs at point K, tripping PCC1 and PCC2. Simultaneously, circuit breaker F10 opens. While F2 is in the open state, the signal path-based model's functionality remains unaffected; however, it will no longer merge received grid models. Specifically, PCC3 will not merge the grid models of PCC1 and PCC2. At this point, tie breaker F2 receives the grid model (dashed line 2) indicating [PCC1, anti-islanding action], immediately triggering tie breaker F2 to perform a synchronization check or a dead-pressure reclosing operation, reconnecting microgrids 1, 2, and 3. After the anti-islanding action, PCC1 and F10 trip, tripping PCC2. Tie breaker F2 receives the anti-islanding action and dead-pressure reclosing operation, completing the reconnection of microgrids 1, 2, and 3. Before regenerating the grid model, the relevant action signals are reset. Therefore, the new tie breaker F10 will not receive the anti-islanding action signal [PCC1, anti-islanding action] and will not perform the dead-pressure reclosing operation. The re-networking method of the present invention can ensure that in the event of a permanent fault at K, only the load belonging to F11 loses power, thereby ensuring the power supply reliability of the loads in the multi-microgrid group.

[0038] The present disclosure may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0039] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punched card or raised structure in a groove on which instructions are stored, and any suitable combination thereof. As used herein, a computer-readable storage medium is not to be construed as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse passing through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

[0040] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0041] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state 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++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of 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, the state information of the computer-readable program instructions is used to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), so that the electronic circuit can execute the computer-readable program instructions, thereby implementing various aspects of the present disclosure.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A microgrid anti-islanding protection method based on real-time topology identification, characterized in that: Includes the following: Based on the operating status of the switches at the grid connection point and the operating status of the switches within the microgrid, the real-time topology identification of the microgrid group is carried out by transferring the sub-microgrid grid connection model; Based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid group, the anti-islanding protection of the microgrid group is carried out; After the anti-islanding protection of the microgrid group is activated, the microgrid group after unplanned islanding is re-networked through the tie switch.

2. The microgrid anti-islanding protection method based on real-time topology identification according to claim 1 is characterized by: The real-time topology of the microgrid group includes the networking mode and grid connection mode of each sub-microgrid; when the interconnecting switches between multiple sub-microgrids are in the closed position, the multiple sub-microgrids are judged to be networked and operating; when the interconnecting switches of a sub-microgrid and other sub-microgrids are all in the open position, the sub-microgrid is judged to be operating independently.

3. The microgrid anti-islanding protection method based on real-time topology identification according to claim 2 is characterized by: If the grid-connected switch of a sub-microgrid is in the closed state, the grid-connected model of the sub-microgrid will be constructed based on the grid-connected switch sequence number and the anti-islanding protection action status, and will be transmitted step by step to the adjacent switches through the horizontal communication link. After transmission and aggregation, the grid-connected models of each sub-microgrid in network operation will be obtained.

4. The microgrid anti-islanding protection method based on real-time topology identification according to claim 3 is characterized by: The method of transmitting the horizontal communication link to the adjacent switches step by step is as follows: When the switches in the microgrid are in a closed or flowing state, the received grid-connected models are merged and broadcasted to the adjacent switches.

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

6. The microgrid anti-islanding protection method based on real-time topology identification according to claim 1 is characterized by: When the anti-islanding protection is activated at any grid-connected point, the other grid-connected points of each sub-microgrid in the network will be linked together in combination with the real-time topology of the microgrid group.

7. The microgrid anti-islanding protection method based on real-time topology identification according to claim 1 is characterized by: The grid connection point switch in anti-islanding protection action identifies the received grid connection model in real time. If there are other grid connection point switch numbers besides this switch number, the other grid connection points of the microgrid group are judged according to the switch numbers of other grid connection points. When the anti-islanding protection of this switch is activated, a joint trip command is immediately sent to other grid connection points.

8. The microgrid anti-islanding protection method based on real-time topology identification according to claim 1 is characterized by: The method for re-networking a microgrid group after an unplanned islanding is as follows: After the anti-islanding protection of all microgrid grid-connected points is activated, if the tie switch receives a signal that the anti-islanding protection action status in any sub-microgrid grid-connected model is triggered, it will immediately start synchronization check or voltage-free reclosing check to achieve re-networking of the microgrid group after unplanned islanding.

9. A microgrid anti-islanding protection system based on real-time topology identification and the microgrid anti-islanding protection method according to any one of claims 1 to 8, comprising a microgrid real-time topology identification module, a microgrid anti-islanding protection module, and a microgrid re-networking module, characterized in that: The microgrid cluster real-time topology identification module performs real-time topology identification of the microgrid cluster by transferring the sub-microgrid grid connection model based on the operating status of the switch at the grid connection point and the operating status of the switches within the microgrid cluster; Microgrid anti-islanding protection module, which performs anti-islanding protection for the microgrid based on the anti-islanding protection action status of the grid connection point and the real-time topology of the microgrid; The microgrid group re-networking module re-networks the microgrid group after unplanned islanding through the tie switch after the microgrid group anti-islanding protection is activated.

10. 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 execute the steps of the method according to any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is processed according to the steps of the method according to any one of claims 1 to 8.

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