Main-distribution cooperative island reconstruction power recovery method, system, equipment and medium

Abstract

The invention relates to the technical field of electric power systems, and discloses a main and distribution cooperative island reconstruction power restoration method, system, device and medium, according to the method, automatic switches on a plurality of lines of a power distribution network are constructed into a tree-connected switch tree structure, when the power distribution network breaks down, power restoration can be carried out by a network construction energy storage converter in a fault area, and the power restoration efficiency is improved. And if yes, carrying out island division on the power restoration area in the switch tree structure according to a preset network construction power restoration mode. Inverted power supply is carried out on a network-building power recovery island area by means of a network-building energy storage converter, so that under the condition that a large power grid breaks down or power supply cannot be recovered from other power sources, equipment and power grid information is interacted in real time through mutual cooperation of the network-building energy storage converters on a main station and a distribution network line, and the main station carries out unified coordination to realize real-time power supply recovery. Isolation and independent networking of the power supply area connected with the network building inverter and the large power grid are achieved, island reconstruction power restoration is carried out on the power restoration island area, and therefore the power supply reliability of the power distribution network is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method, system, equipment and medium for main and distribution coordinated island reconstruction and power restoration. Background Art

[0002] In recent years, new energy has developed rapidly. After a large number of distributed photovoltaic, energy storage, wind power, etc. have been connected to the power grid, the distribution network has changed from a single consumer end to a multi-source network. This forms an independent small system when the power grid fails, providing power supply guarantee for important loads and critical loads.

[0003] On the other hand, distributed energy storage technology has developed rapidly in recent years, especially the grid-type energy storage inverter, which has similar operating characteristics to synchronous generators and can independently build the voltage amplitude and phase of the AC side without relying on the external AC system, providing stable voltage and frequency support for the power grid without electricity. This provides solid technical support for making full use of grid-type energy storage and distributed power sources to realize the rapid restoration of power supply to the local power grid in the event of a large power grid failure.

[0004] The current distribution automation self-healing technology is aimed at distribution network lines. When a line fails, other power sources are used to automatically transfer power to the non-fault area of ​​the faulty line, such as Figure 1 As shown in the figure, if a large power grid fails, or there is no other power supply contact point on the line, and it is impossible to restore power from other power sources, even if there are grid-connected energy storage inverter equipment and other distributed energy sources on the line, since the grid-connected energy storage inverter itself does not have the ability to communicate with the various automatic switches on the line, it cannot control the local area of ​​the distribution network connected to the grid-connected energy storage inverter to be disconnected from the grid. Even if it can communicate with other switches in the surrounding area, it cannot obtain the output information of other distributed energy sources, cannot obtain the topological connection relationship of the entire distribution network, and cannot perform effective coordinated power restoration, making it difficult for all kinds of self-healing technologies to restore power to such lines. At the same time, the inverter power supply power of the grid-connected energy storage inverter is limited and cannot support the power supply of the large power grid. Therefore, in this special scenario, it is impossible to perform inverter power supply to the local area where the grid-connected energy storage inverter is located, making it difficult to island reconstruct and restore power to the non-fault area of ​​the line, and the power supply reliability of the distribution network is poor. Summary of the invention

[0005] In view of this, the present invention provides a main-distribution coordinated island reconstruction and power restoration method, system, equipment and medium, which solves the technical problems that the current distribution automation self-healing technology is difficult to perform island reconstruction and power restoration in non-fault areas of the line, and the power supply reliability of the distribution network is poor.

[0006] A first aspect of the present invention provides a method for power restoration of a primary distribution coordinated island by reconfiguring the primary distribution coordinated island, comprising:

[0007] According to the line connection relationship of the distribution network, the automatic switches on the multiple lines of the distribution network are constructed into a switch tree structure with a tree connection relationship;

[0008] In the event of a fault in the distribution network, determining whether the faulty area is restored by the grid-connected energy storage converter;

[0009] When it is determined that the fault area is restored by the grid-building energy storage converter, the restored area in the switch tree structure is islanded according to a preset grid-building restoration mode to obtain a grid-building restoration island area;

[0010] The grid-building energy storage converter is used to provide inverting power to the grid-building power restoration island area until the fault of the distribution network is eliminated, and then the grid-connected power restoration island area is connected to the grid for power supply.

[0011] Preferably, the automatic switches on multiple lines of the distribution network are constructed into a switch tree structure with a tree connection relationship according to the line connection relationship of the distribution network, including:

[0012] Obtaining the operating status of all automatic switches on the distribution network, as well as the operating status of the grid-connected energy storage converter and distributed energy;

[0013] According to the line connection relationship of the distribution network, the busbar of the distribution network is taken as the root, and the path from the access point where the network-building energy storage converter is connected to the distribution network to the root node switch is listed as the trunk path; wherein the root node switch is the automation switch closest to the busbar of the distribution network on the line where the network-building energy storage converter is located;

[0014] According to the line connection relationship of the distribution network, the lines where the devices on the distribution network other than the grid-building energy storage inverter are located are determined as branch paths derived from the trunk path, and the access point where the distributed energy or load is connected to the distribution network is used as the end of the branch path to construct a switch tree structure.

[0015] Preferably, the method further comprises:

[0016] Real-time collection of busbars on the switch tree structure and voltage and current information of all automated switches;

[0017] Determine whether the automatic switches on the distribution network lose voltage according to the voltage information of the busbar, and the voltage information and current information of all automatic switches;

[0018] When it is determined that the automatic switch on the distribution network loses pressure, it is determined that the distribution network fails, and the automatic switch that loses pressure is determined as the pressure-losing switch;

[0019] When it is determined that the automatic switch on the distribution network has not lost voltage, the process proceeds to the step of real-time acquisition of voltage information and current information of the busbars on the switch tree structure and all the automatic switches.

[0020] Preferably, the step of judging whether the faulty area is restored to power by the grid-connected energy storage converter comprises:

[0021] Determine whether the voltage loss switch is an off-grid analysis switch; wherein the off-grid analysis switch is an automated switch on the trunk path within the switch tree structure;

[0022] When it is determined that the pressure loss switch is the off-grid analysis switch, it is determined that the fault area is restored to power by the grid-connected energy storage converter;

[0023] When it is determined that the voltage loss switch is not the off-grid analysis switch, it is determined that the fault area cannot be restored to power by the grid-connected energy storage converter.

[0024] Preferably, the power restoration area in the switch tree structure is divided into islands according to a preset network restoration mode to obtain a network restoration island area, including:

[0025] Determine whether the pressure loss switch has a protection action signal sent to the master station;

[0026] If it is determined that the undervoltage switch has a protection action signal sent to the master station, it is determined to be a fault in the undervoltage area, and the power restoration switch is determined according to the location of the fault area;

[0027] If it is determined that the voltage loss switch has no protection action signal sent to the master station, it is determined to be a fault in the non-voltage loss area, and the automatic switch downstream of the bus is determined to be a power restoration switch;

[0028] Based on the preset networking and power restoration mode, the power restoration area in the switch tree structure is islanded according to the power restoration switch to obtain the networking and power restoration island area.

[0029] Preferably, determining the power restoration switch according to the location of the fault area includes:

[0030] The automation switch that is farthest from the root node switch and sends the protection action signal to the master station is determined as the upper boundary of the fault area, the automation switch that is closest to the downstream of the upper boundary of the fault area is determined as the lower boundary of the fault area, and the area formed by the upper boundary of the fault area and the lower boundary of the fault area is used as the fault area;

[0031] Determining whether the fault area is on a trunk path on the switch tree structure;

[0032] When it is determined that the fault area is not on the trunk path of the switch tree structure, isolation and power restoration processing is performed according to the end fault mode;

[0033] When it is determined that the fault area is on the trunk path on the switch tree structure, it is determined whether the fault area coincides with the access point of the grid-connected energy storage converter;

[0034] When it is determined that the fault area coincides with the access point of the grid-connected energy storage converter, all downstream automatic switches of the fault area are used as power restoration switches;

[0035] When it is determined that the fault area does not coincide with the access point of the grid-connected energy storage converter, the process ends.

[0036] Preferably, the preset network construction and power restoration mode includes a maximum range power restoration mode, a longest support time power restoration mode, and a specified support time power restoration mode;

[0037] When the preset network restoration mode is the maximum range restoration mode, the restoration area in the switch tree structure is islanded according to the restoration switch, including:

[0038] Sorting the plurality of the power recovery switches from near to far from the root node switch, and determining the maximum load current of each power recovery switch according to the sorting result;

[0039] Determine whether the maximum load current of the power restoration switch is greater than a predetermined maximum power supply current value, and use the power restoration switch whose maximum load current is greater than the predetermined maximum power supply current value as a power restoration area division switch;

[0040] The switch tree structure is isolated and islanded according to the switch for dividing the power restoration area, so as to obtain the network power restoration island area;

[0041] When the preset network restoration mode is the longest support time restoration mode, the restoration area in the switch tree structure is islanded according to the restoration switch, including:

[0042] Screen out the power restoration switches whose maximum load current is less than the predetermined maximum supply current value as candidate power restoration area division switches;

[0043] Select the candidate power restoration area division switch with the smallest historical average load integrated electricity as the power restoration area division switch;

[0044] The switch tree structure is isolated and islanded according to the switch for dividing the power restoration area, so as to obtain the network power restoration island area;

[0045] When the preset network construction and power restoration mode is a designated support duration power restoration mode, the power restoration area in the switch tree structure is islanded according to the power restoration switch, including:

[0046] Sorting the plurality of the power recovery switches from near to far from the root node switch, and determining the maximum load current of each power recovery switch according to the sorting result;

[0047] Determine whether the maximum historical load current of the power restoration switch is less than a predetermined maximum power supply current value, and use the power restoration switch whose maximum historical load current is less than the predetermined maximum power supply current value as a candidate power restoration area division switch;

[0048] The candidate power restoration area division switch whose average integrated power quantity in the historical power outage period is less than or equal to the energy storage quantity of the grid-building energy storage converter is used as the power restoration area division switch;

[0049] The switch tree structure is isolated and islanded according to the power restoration area division switch to obtain the network power restoration island area.

[0050] In a second aspect, the present invention further provides a main distribution coordinated island reconstruction and power restoration system, comprising:

[0051] A tree structure construction module, used to construct the automatic switches on multiple lines of the distribution network into a switch tree structure with a tree connection relationship according to the line connection relationship of the distribution network;

[0052] A power restoration judgment module, used to judge whether the fault area is restored by the grid-connected energy storage converter when a fault occurs in the distribution network;

[0053] An island division module is used to divide the power restoration area in the switch tree structure into islands according to a preset power restoration mode to obtain a power restoration island area when it is determined that the fault area is restored by the network energy storage converter;

[0054] The power restoration module is used to perform inversion power supply to the grid-building power restoration island area through the grid-building energy storage converter until the fault of the distribution network is eliminated, and then the grid-connected power supply to the grid-building power restoration island area is performed.

[0055] In a third aspect, the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the main and distribution coordinated island reconstruction and power restoration method as described in the first aspect.

[0056] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the steps of the main and distribution coordinated island reconstruction and power restoration method as described in the first aspect.

[0057] It can be seen from the above technical solutions that the present invention constructs the automatic switches on multiple lines of the distribution network into a switch tree structure with tree-like connections. When a fault occurs in the distribution network, if the faulty area can be restored by the networking energy storage inverter, the restoration area in the switch tree structure is divided into islands according to the preset networking restoration mode. The networking energy storage inverter is used to perform inverter power supply to the network restoration island area, so that when a large power grid fails or power supply cannot be restored from other power sources, the master station and the networking energy storage inverter on the distribution network line cooperate with each other, and the equipment and power grid information are exchanged in real time. The master station coordinates uniformly to achieve isolation of the power supply area connected to the networking inverter from the large power grid, independent networking, and island reconstruction and restoration of power to the restoration island area, thereby significantly improving the power supply reliability of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0059] Figure 1 It is a schematic diagram of the tree-like non-connected line topology including the grid-building inverter;

[0060] Figure 2 An application environment of a main distribution collaborative island reconstruction and power restoration method provided by an embodiment of the present invention;

[0061] Figure 3 A flowchart of a method for power restoration of a main distribution coordinated island provided by an embodiment of the present invention;

[0062] Figure 4 It is a schematic diagram of the line topology including distributed energy and grid-connected energy storage inverters;

[0063] Figure 5 This is a topology diagram of the terminal fault processing line;

[0064] Figure 6 A schematic diagram of the structure of a main distribution cooperative island reconstruction and power restoration system provided by an embodiment of the present invention;

[0065] Figure 7 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0066] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] The main distribution coordinated island reconstruction and power restoration method provided in the embodiment of the present application can be applied to the following Figure 2 In the application environment shown. Among them, the distribution network communicates with the server 102 through the network. The data storage system can store the data that the server 102 needs to process. The data storage system can be integrated on the server 102, or it can be placed on the cloud or other network servers. The server 102 constructs the automatic switches on multiple lines of the distribution network into a switch tree structure with a tree connection relationship according to the line connection relationship of the distribution network; in the event of a fault in the distribution network, it is determined whether the fault area is restored by the network energy storage converter; when it is determined that the fault area is restored by the network energy storage converter, the restored power area in the switch tree structure is islanded according to the preset network restoration mode to obtain the network restoration island area; the network restoration island area is inverted and powered by the network energy storage converter until the fault of the distribution network is eliminated, and the network restoration island area is connected to the grid for power supply. The server 102 can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0068] like Figure 3 As shown, the embodiment of the present application provides a method for power restoration of a main distribution coordinated island. Figure 2 The server 102 in the example is used as an example to illustrate the method, which includes the following steps S1 to S4. Among them:

[0069] Step S1: According to the line connection relationship of the distribution network, the automatic switches on multiple lines of the distribution network are constructed into a switch tree structure with a tree connection relationship.

[0070] Among them, there are multiple automatic switches on multiple lines of the distribution network, including section switches and tie switches, etc. The automatic switches are used to control the on and off of circuits in the distribution network. Constructing the automatic switches on multiple lines of the distribution network as a switch tree structure with a tree-like connection relationship can clearly display the line connection relationship of the distribution network, providing a basis for subsequent fault analysis and island division.

[0071] Step S2: When a fault occurs in the distribution network, determine whether the faulty area is restored to power by the grid-connected energy storage converter.

[0072] Among them, when it is determined that a fault occurs in the distribution network, it is determined whether the fault area can be restored by the grid-building energy storage inverter by judging whether the fault area can be restored by the grid-building energy storage inverter. When it is determined that the fault area cannot be restored by the grid-building energy storage inverter, it is necessary to delay for a certain period of time and then proceed to the step of constructing the automatic switches on multiple lines of the distribution network into a switch tree structure with a tree-like connection relationship according to the line connection relationship of the distribution network.

[0073] Step S3: when it is determined that the faulty area is restored by the grid-building energy storage converter, the restored area in the switch tree structure is islanded according to a preset grid-building restoration mode to obtain a grid-building restoration island area.

[0074] Among them, the preset network restoration mode is pre-set according to actual needs and is used to guide the strategy or mode of island division. These modes may include but are not limited to the previously mentioned maximum range restoration mode, the longest support time restoration mode, and the specified support time restoration mode. Each mode has its specific application scenarios and advantages, and the appropriate network restoration mode can be selected according to the actual situation of the distribution network and the needs of fault recovery. By applying the preset network restoration mode, the restoration area within the switch tree structure can be efficiently and accurately divided, thereby obtaining the network restoration island area, which provides a basis for subsequent inverter power supply through the network energy storage converter.

[0075] Step S4: The grid-connected energy storage converter is used to provide inverting power to the grid-connected power island area until the fault in the distribution network is eliminated, and then the grid-connected power supply is provided to the grid-connected power island area.

[0076] In this process, the establishment of the network restoration island area is controlled by the master station to disconnect the automatic switch on the distribution network line, thereby dividing the area. The network energy storage converter is used to invert the power supply to the area to ensure power supply. When the large power grid fails and disappears, the master station will monitor the voltage and current of each automation node to determine whether the large power grid fault has been eliminated. Once it is confirmed that the fault has been eliminated, the master station will control the closing of the island division switch to achieve the connection of the network restoration island area with the main grid, thereby restoring the normal power supply mode.

[0077] It should be noted that the present invention constructs the automatic switches on multiple lines of the distribution network into a switch tree structure with tree-like connections. When a fault occurs in the distribution network, if the faulty area can be restored by the networking energy storage inverter, the restoration area in the switch tree structure is divided into islands according to the preset networking restoration mode. The networking energy storage inverter is used to perform inverter power supply to the networking restoration island area, so that when a fault occurs in the large power grid or power supply cannot be restored from other power sources, the master station and the networking energy storage inverter on the distribution network line cooperate with each other, and the equipment and power grid information are exchanged in real time. The master station coordinates uniformly to achieve isolation of the power supply area connected to the networking inverter from the large power grid, independent networking, and island reconstruction and restoration of power to the restoration island area, thereby significantly improving the power supply reliability of the distribution network.

[0078] In some embodiments, in step S1, according to the line connection relationship of the distribution network, the automatic switches on the multiple lines of the distribution network are constructed into a switch tree structure with a tree connection relationship, including:

[0079] Step S101: Obtain the operating status of all automatic switches on the distribution network, as well as the operating status of the grid-connected energy storage converter and distributed energy.

[0080] Among them, the distribution line connection relationship, the operating status of all automatic switches on the distribution line, and the operating status of the grid-connected energy storage inverter and distributed energy are obtained from the automation master station system. The operating status includes real-time voltage, current, power size and direction.

[0081] Step S102: according to the line connection relationship of the distribution network, the busbar of the distribution network is taken as the root, and the path between the access point where the network-building energy storage converter is connected to the distribution network and the root node switch is listed as the trunk path; wherein the root node switch is the automation switch closest to the busbar of the distribution network on the line where the network-building energy storage converter is located.

[0082] Among them, the automatic switches on the lines where the grid-connected energy storage converter and distributed energy are located are arranged into a tree-like connection relationship according to the topological connection relationship, with the busbar as the root, and the path between the grid-connected energy storage converter access point and the root node switch is listed as the trunk path, and the automatic switches on the trunk path are listed as off-grid analysis switches, such as Figure 4 As shown, the automation switches FB1, FB2, FB3, FB5 can be used as off-grid analysis switches.

[0083] Step S103: According to the line connection relationship of the distribution network, the lines where the devices other than the grid-building energy storage converter are located on the distribution network are determined as branch paths derived from the trunk path, and the access point where the distributed energy or load is connected to the distribution network is used as the end of the branch path to build a switch tree structure.

[0084] Among them, according to the line connection relationship of the distribution network, the lines where other devices in the distribution network are located except the grid-building energy storage converter are clearly identified as branch lines drawn from the main line path. At the same time, the access point where the distributed energy or load is connected to the distribution network is used as the end of the branch line path. Through such steps, we can build a switch tree structure. Figure 4 As shown, the line where the automation switches FB4 and FB6 are located can be used as a branch path, the line where the automation switches FB4, FB8, FB9, FB10, and FB7 are located can be used as a branch path, and the line where the automation switches FB4, FB8, FB9, FB10, and FB11 are located can be used as a branch path.

[0085] In some embodiments, it is necessary to determine whether a distribution network failure occurs, so the method proposed in the embodiments of the present application further includes:

[0086] Step S11: collecting voltage information and current information of the busbars on the switch tree structure and all automated switches in real time.

[0087] Step S12: judging whether the automatic switches on the distribution network have lost voltage based on the voltage information of the busbar and the voltage information and current information of all the automatic switches.

[0088] Step S13: When it is determined that the automatic switch on the distribution network loses pressure, it is determined that a fault occurs in the distribution network, and the automatic switch that loses pressure is determined as the pressure-losing switch.

[0089] Step S14: when it is determined that the automatic switch on the distribution network has not lost voltage, the process proceeds to the step of collecting voltage information and current information of the busbars on the switch tree structure and all the automatic switches in real time.

[0090] For example, Figure 4 As shown, the voltage of the bus connected to the line and all switches on the switch tree is collected to determine whether the bus voltage is less than U0 or the voltage of two or more switches is less than U0, and the real-time current of the switch is less than I0. If so, it is determined that a fault occurs in the distribution network, and the automatic switch with voltage loss is determined as the voltage loss switch; if not, a delay of T1 is performed, and the voltage and current information of the bus on the switch tree structure and all automatic switches are collected in real time in a loop.

[0091] Among them, different numbers can be set for the automatic switches to distinguish the pressure loss switches and determine the locations of the pressure loss switches.

[0092] In some embodiments, the step S2 of determining whether the faulty area is restored to power by the grid-connected energy storage converter includes:

[0093] Step S201, determining whether the pressure loss switch is an off-grid analysis switch; wherein the off-grid analysis switch is an automated switch on a trunk path within a switch tree structure;

[0094] Step S202: When it is determined that the voltage loss switch is an off-grid analysis switch, it is determined that the faulty area is restored to power by the grid-connected energy storage converter.

[0095] Step S203: When it is determined that the voltage loss switch is not an off-grid analysis switch, it is determined that the fault area cannot be restored to power by the grid-connected energy storage converter.

[0096] Among them, when it is determined that the fault area cannot be restored by the grid-connected energy storage converter, a delay of T3 is performed, and the automatic switches on multiple lines of the distribution network are constructed into a switch tree structure with a tree connection relationship according to the line connection relationship of the distribution network.

[0097] In some embodiments, in step S3, the power restoration area in the switch tree structure is divided into islands according to the preset network restoration mode to obtain the network restoration island area, including:

[0098] Step S301, determine whether the undervoltage switch has a protection action signal sent to the master station.

[0099] Among them, the protection action signal sent to the master station refers to

[0100] The signal sent by the automation switch to the master station when a fault occurs contains information such as the type and location of the fault. The master station can further determine the specific situation of the fault based on the protection action signal received, thereby providing a more accurate basis for subsequent island division.

[0101] Step S302: If it is determined that the undervoltage switch has a protection action signal sent to the master station, it is determined to be a fault in the undervoltage area, and the power restoration switch is determined according to the location of the fault area.

[0102] Wherein, determining the power restoration switch according to the location of the fault area includes:

[0103] Step S3021: The automation switch that is farthest from the root node switch and sends the protection action signal to the master station is determined as the upper boundary of the fault area, and the automation switch closest to the downstream of the upper boundary of the fault area is determined as the lower boundary of the fault area. The area formed by the upper boundary of the fault area and the lower boundary of the fault area is used as the fault area.

[0104] When locating the fault, first check the switch farthest from the root node switch that has a protection action signal. This switch will be determined as the upper boundary of the fault area. Then, starting from this upper boundary switch, continue searching along the downstream direction of the line until the first switch without protection action is found. This switch is then determined as the lower boundary of the fault area. Finally, the area defined by the upper boundary switch and the lower boundary switch is the identified fault area.

[0105] Step S3022: Determine whether the fault area is on a trunk path in the switch tree structure.

[0106] Step S3023: When it is determined that the fault area is not on the trunk path of the switch tree structure, isolation and power restoration processing is performed according to the end fault mode.

[0107] Among them, the process of isolating and restoring power according to the terminal fault mode is as follows: in the topological relationship tree of the master station, first determine the location of the upper boundary switch. Then, through the remote control function of the master station, separate the upper boundary switch. Next, starting from the root node, check the path to the boundary switch upward to confirm whether there are any switches in the disconnected state. If a switch is found to be disconnected, the master station will issue a command to automatically close all disconnected switches from the root node to the upper boundary switch, thereby realizing power restoration upstream of the fault area. After completing this series of operations, the process will automatically jump and end.

[0108] For example, Figure 5 As shown in the figure, if the fault area is between the automatic switches FB9 and FB10, the upper boundary switch is FB9, and its upstream switch may trip due to the coordination problem of the differential protection, and one or more switches on the fault path may trip due to the protection action. In this case, the power restoration strategy of the master station is to remotely disconnect the FB9 switch, close the FB1 and FB8 switches, and restore the power supply to the non-fault area in the front section of the fault line.

[0109] Step S3024: When it is determined that the fault area is on the trunk path on the switch tree structure, it is determined whether the fault area coincides with the access point of the grid-connected energy storage converter.

[0110] Step S3025: when it is determined that the fault area coincides with the access point of the grid-connected energy storage converter, all downstream automatic switches of the fault area are used as power restoration switches;

[0111] Step S3026: When it is determined that the fault area does not coincide with the access point of the grid-connected energy storage converter, the process ends.

[0112] In the fault area determination process, it can be confirmed whether the fault area overlaps with the access point of the grid-connected energy storage converter. This determination can be completed by comparing the position relationship between the lower boundary switch of the fault area and the switch at the access point of the grid-connected energy storage converter. If the comparison confirms that the positions of the two overlap, it means that the fault area overlaps with the access point of the grid-connected energy storage converter. In this particular case, due to the particularity of the access point of the grid-connected energy storage converter, the power restoration operation of the grid-connected converter cannot be implemented, so it should jump directly to the end of the process. If the comparison result shows that the positions of the two do not overlap, the subsequent power restoration operation should be continued. At this time, the switch downstream of the fault area should be determined as the power restoration switch, and its switch identifier (ID) should be recorded to facilitate the subsequent accurate division of the grid-connected power restoration range.

[0113] Step S303: If it is determined that the voltage loss switch has not sent a protection action signal to the master station, it is determined to be a fault in the non-voltage loss area, and the automatic switch downstream of the bus is determined to be a power restoration switch.

[0114] Step S304: Based on the preset network construction and power restoration mode, the power restoration area in the switch tree structure is divided into islands according to the power restoration switches to obtain network construction and power restoration island areas.

[0115] Among them, the preset network restoration modes include the maximum range restoration mode, the longest support time restoration mode and the specified support time restoration mode.

[0116] In some embodiments, when the preset network restoration mode is the maximum range restoration mode, the restoration area in the switch tree structure is islanded according to the restoration switch, including:

[0117] Step S304-01: sort a plurality of power restoration switches from near to far from the root node switch, and determine the maximum load current of each power restoration switch according to the sorting result.

[0118] Step S304-02: determine whether the maximum load current of the power restoration switch is greater than a predetermined maximum supply current value, and use the power restoration switch whose maximum load current is greater than the predetermined maximum supply current value as a power restoration area division switch.

[0119] Step S304-03: divide the switch tree structure into isolated islands according to the power restoration area division switches to obtain network power restoration island areas.

[0120] Exemplarily, the master station reads the maximum inverter power parameter of the grid-connected energy storage converter, and converts it according to the rated voltage to the maximum power supply current Ipmax; sorts multiple power restoration switches from near to far from the root node switch, and determines whether the power restoration switch has a maximum load current Ifbxmax of the previous three days that is less than Ipmax. If so, the ID of the switch is recorded, and the power restoration switch is used as a power restoration area division switch; if not, jumps directly to the end.

[0121] like Figure 4 As shown, if the fault area is located between fb1 and fb2, FB2, FB3, and FB5 are all division objects, and Ifb2max=max{Ifb2t0, Ifb2t1...Ifb2t287}, Ifb3max=max{Ifb3t0, Ifb3t1...Ifb3t287}, Ifb5max=max{Ifb5t0, Ifb5t1...Ifb5t287} are calculated; compare Ifb2max, Ifb3max, and Ifb5max to see if they are less than or equal to Ipmax. If so, use the corresponding FBx switch as the power restoration area division switch.

[0122] In some embodiments, when the preset network restoration mode is the longest support time restoration mode, the restoration area in the switch tree structure is islanded according to the restoration switch, including:

[0123] Step S304 - 11 , select the power restoration switches whose maximum load current is less than the predetermined maximum supply current as candidate power restoration area division switches.

[0124] Step S304-12: Filter out the candidate power restoration area division switch with the smallest historical average load integrated power as the power restoration area division switch.

[0125] Step S304-13: divide the switch tree structure into isolated islands according to the power restoration area division switches to obtain network power restoration island areas.

[0126] For example, the master station reads the maximum inverter power parameter of the grid-connected energy storage converter, converts it according to the rated voltage, and converts it into the maximum power supply current Ipmax; finds the power-recovery switch whose maximum load current Ifbxmax is less than Ipmax from the power-recovery switches, and the power-recovery switch with the smallest average load integral power in the previous three days, then records the ID of the switch, and uses the switch as the power-recovery area division switch. If not, jump directly to the end.

[0127] Among them, the average load integral power is:

[0128] Wfbx=1.732*10*0.25(Ifbxt0++Ifbxt1+...+Ifbxt287) / 3.

[0129] like Figure 4 As shown, if the fault area is located between fb1 and fb2, FB2, FB3, and FB5 are all division objects, and Ifb2max=max{Ifb2t0, Ifb2t1...Ifb2t287}, Ifb3max=max{Ifb3t0, Ifb3t1...Ifb3t287}, Ifb5max=max{Ifb5t0, Ifb5t1...Ifb5t287} are calculated; first compare whether Ifb5max, Ifb3max, and Ifb2max are <=Ipmax, if so, calculate Wfbx=1.732*10*0.25(Ifbxt0+Ifbxt1+...+Ifbxt287) / 3, and select the switch with the minimum Wfbx as the power restoration area division switch.

[0130] In some embodiments, when the preset network restoration mode is a designated support duration restoration mode, the restoration area in the switch tree structure is islanded according to the restoration switch, including:

[0131] Step S304-21, sorting the multiple power restoration switches from near to far from the root node switch, and determining the maximum load current of each power restoration switch according to the sorting result;

[0132] Step S304-22, determining whether the maximum historical load current of the power restoration switch is less than the predetermined maximum supply current value, and taking the power restoration switch whose maximum historical load current is less than the predetermined maximum supply current value as a candidate power restoration area division switch;

[0133] Step S304-23, taking the candidate power restoration area division switch whose average integrated power in the historical power outage period is less than or equal to the energy storage power of the grid-building energy storage converter as the power restoration area division switch;

[0134] Step S304-24: divide the switch tree structure into isolated islands according to the power restoration area division switches to obtain network power restoration island areas.

[0135] Exemplarily, the master station reads the maximum inverter power parameter of the network energy storage converter, reads the energy storage power Wcn of the network energy storage converter, and converts it according to the rated voltage to the maximum power supply current Ipmax; from the root node from near to far, the power restoration switches are sorted out according to the topological relationship, and the maximum load current Ifbxmax of the power restoration switch in the previous three days is less than Ipmax, and the average integrated power Wfbxtt4<=Wcn*Q in the time period of the power outage T~T+T4 in the previous three days is analyzed in turn. If there is, the ID of the switch is recorded, and the switch is used as the power restoration area division switch. If not, jump to when the preset network power restoration mode is the longest support time power restoration mode, then the power restoration area in the switch tree structure is islanded according to the power restoration switch.

[0136] Among them, Figure 4 If the fault area is located between fb1 and fb2, FB2, FB3, and FB5 are all partition objects. Calculate Ifb2max=max{Ifb2t0, Ifb2t1...Ifb2t287}, Ifb3max=max{Ifb3t0, Ifb3t1...Ifb3t287}, Ifb5max=max{Ifb5t0, Ifb5t1...Ifb5t287}; compare in turn whether Ifb2max<=Ipmax and Wfb2tt4<=Wcn*Q, Ifb3max<=Ipmax and Wfb3tt4<=Wcn*Q, Ifb5max<=Ipmax and Wfb5tt4<=Wcn*Q. If so, use the corresponding FBx switch as the power restoration area partition switch.

[0137] It should be noted that the embodiment of the present application also proposes a multi-mode power restoration solution (power restoration in the maximum range, power restoration in the longest support time, and specified support duration mode) for the special problem that the inverter power supply of the grid-building energy storage inverter is limited and cannot support the power supply of the large power grid. By cooperating with the energy storage battery and distributed photovoltaics, the local area can be inverted and the grid is restored, realizing microgrid power supply.

[0138] At the same time, the embodiments of the present application can be fully implemented through computers without the need for human intervention. The network construction and power restoration speed is very fast, which greatly reduces the power outage time caused by distribution network faults and maximizes the power supply reliability of distribution lines.

[0139] Based on the same inventive concept, an embodiment of the present application also provides a main distribution collaborative island reconstruction and power restoration system for implementing the above-mentioned main distribution collaborative island reconstruction and power restoration method.

[0140] The implementation solution for solving the problem provided by the system is similar to the implementation solution recorded in the above method. Therefore, the specific limitations in one or more main and distribution collaborative island reconstruction and power restoration system embodiments provided below can be referred to the limitations on the main and distribution collaborative island reconstruction and power restoration method above, and will not be repeated here.

[0141] like Figure 6 As shown, the embodiment of the present application provides a main distribution coordinated island reconstruction and power restoration system, including:

[0142] A tree structure construction module 100 is used to construct the automatic switches on multiple lines of the distribution network into a switch tree structure with a tree connection relationship according to the line connection relationship of the distribution network;

[0143] A power restoration judgment module 200 is used to judge whether the fault area is restored by the grid-connected energy storage converter when a fault occurs in the distribution network;

[0144] The island division module 300 is used to divide the power restoration area in the switch tree structure into islands according to a preset power restoration mode to obtain a power restoration island area when it is determined that the fault area is restored by the network energy storage converter.

[0145] The power restoration module 400 is used to provide inverting power supply to the grid-building power restoration island area through the grid-building energy storage converter until the fault of the distribution network is eliminated, and then the grid-connected power supply to the grid-building power restoration island area is provided.

[0146] In some embodiments, the tree structure building module 100 is used to obtain the operating status of all automatic switches on the distribution network, as well as the operating status of the grid-connected energy storage converter and distributed energy resources;

[0147] According to the line connection relationship of the distribution network, the busbar of the distribution network is taken as the root, and the path from the access point where the network energy storage converter is connected to the distribution network to the root node switch is listed as the trunk path; wherein the root node switch is the automation switch closest to the busbar of the distribution network on the line where the network energy storage converter is located;

[0148] According to the line connection relationship of the distribution network, the lines where the devices other than the grid-building energy storage inverter are located on the distribution network are determined as branch paths derived from the trunk path, and the access point where the distributed energy or load is connected to the distribution network is taken as the end of the branch path to construct a switch tree structure.

[0149] In some embodiments, the system further includes: a fault judgment module for collecting voltage information and current information of buses on the switch tree structure and all automated switches in real time;

[0150] Determine whether the automatic switches on the distribution network are under voltage based on the voltage information of the busbar, as well as the voltage and current information of all automatic switches;

[0151] When it is determined that the automatic switch on the distribution network loses pressure, it is determined that a fault occurs in the distribution network, and the automatic switch that loses pressure is determined as the pressure-losing switch;

[0152] When it is determined that the automatic switch on the distribution network has not lost voltage, the process proceeds to the step of collecting the voltage information and current information of the busbars on the switch tree structure and all the automatic switches in real time.

[0153] In some embodiments, the power recovery judgment module 200 is used to judge whether the voltage loss switch is an off-grid analysis switch; wherein the off-grid analysis switch is an automated switch on a trunk path in a switch tree structure;

[0154] When the voltage loss switch is determined to be an off-grid analysis switch, it is determined that the fault area is restored by the grid-connected energy storage converter;

[0155] When it is determined that the voltage loss switch is not an off-grid analysis switch, it is determined that the fault area cannot be restored to power by the grid-connected energy storage converter.

[0156] In some embodiments, the island division module 300 is used to determine whether the undervoltage switch has a protection action signal sent to the master station;

[0157] If it is determined that the undervoltage switch has a protection action signal sent to the master station, it is determined to be a fault in the undervoltage area, and the power restoration switch is determined according to the location of the fault area;

[0158] If it is determined that the voltage loss switch has no protection action signal sent to the master station, it is determined to be a fault in the non-voltage loss area, and the automatic switch downstream of the bus is determined to be a power-recovery switch;

[0159] Based on the preset network construction and power restoration mode, the power restoration area in the switch tree structure is divided into islands according to the power restoration switches to obtain the network construction and power restoration island areas.

[0160] In some embodiments, determining a power restoration switch according to the location of the fault area includes:

[0161] The automation switch that is farthest from the root node switch and sends the protection action signal to the master station is determined as the upper boundary of the fault area, and the automation switch closest to the downstream of the upper boundary of the fault area is determined as the lower boundary of the fault area. The area formed by the upper boundary of the fault area and the lower boundary of the fault area is used as the fault area;

[0162] Determine whether the fault area is on the trunk path on the switch tree structure;

[0163] When it is determined that the fault area is not on the trunk path of the switch tree structure, isolation and power restoration are performed in accordance with the terminal fault method;

[0164] When it is determined that the fault area is on the trunk path on the switch tree structure, it is determined whether the fault area coincides with the access point of the grid-connected energy storage converter;

[0165] When it is determined that the fault area coincides with the access point of the grid-connected energy storage converter, all downstream automatic switches in the fault area are used as power restoration switches;

[0166] When it is determined that the fault area does not coincide with the access point of the grid-connected energy storage converter, the process ends.

[0167] In some embodiments, the preset network restoration mode includes a maximum range restoration mode, a longest support time restoration mode, and a specified support time restoration mode;

[0168] When the preset network restoration mode is the maximum range restoration mode, the restoration area in the switch tree structure is divided into islands according to the restoration switches, including:

[0169] Sort the multiple power recovery switches from near to far from the root node switch, and determine the maximum load current of each power recovery switch according to the sorting result;

[0170] Determine whether the maximum load current of the power restoration switch is greater than a predetermined maximum supply current value, and use the power restoration switch with a load current greater than the predetermined maximum supply current value as a power restoration area division switch;

[0171] According to the power restoration area, the switch tree structure is divided into isolated islands to obtain the power restoration island area of ​​the network;

[0172] When the preset network restoration mode is the longest support time restoration mode, the restoration area in the switch tree structure is divided into islands according to the restoration switches, including:

[0173] Screen out the power restoration switches whose maximum load current is less than the predetermined maximum supply current as candidate power restoration area division switches;

[0174] The candidate power restoration area division switch with the smallest historical average load integrated electricity is selected as the power restoration area division switch;

[0175] According to the power restoration area, the switch tree structure is divided into isolated islands to obtain the power restoration island area of ​​the network;

[0176] When the preset network restoration mode is the designated support duration restoration mode, the restoration area in the switch tree structure is divided into islands according to the restoration switch, including:

[0177] Sort the multiple power recovery switches from near to far from the root node switch, and determine the maximum load current of each power recovery switch according to the sorting result;

[0178] Determine whether the maximum historical load current of the power restoration switch is less than a predetermined maximum power supply current value, and use the power restoration switch whose maximum historical load current is less than the predetermined maximum power supply current value as a candidate power restoration area division switch;

[0179] The candidate power restoration area division switch whose average integrated power during the historical power outage period is less than or equal to the energy storage power of the grid-building energy storage converter is used as the power restoration area division switch;

[0180] The switch tree structure is divided into isolated islands according to the power restoration area, and the power restoration island area of ​​the network is obtained.

[0181] like Figure 7 As shown, an embodiment of the present application also provides an electronic device, the electronic device 10 includes a memory 20 and a processor 30, the memory 20 stores a computer program, and when the computer program is executed by the processor 30, the processor 30 executes the steps of the main and distribution collaborative island reconstruction and power restoration method in any of the above embodiments.

[0182] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the steps of the main and distribution coordinated island reconstruction and power restoration method as in any of the above embodiments.

[0183] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, electronic device and computer storage medium can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0184] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0185] In several embodiments provided by the present invention, it is understood that each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and a part of a module, a program segment or a code includes one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0186] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, electronic devices, computer storage media and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0187] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0188] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0189] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for executing all or part of the steps of the method described in each embodiment of the present invention through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0190] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for power restoration of a main distribution network in coordination with an isolated island, characterized in that: include: According to the line connection relationship of the distribution network, the automatic switches on the multiple lines of the distribution network are constructed into a switch tree structure with a tree connection relationship; In the event of a fault in the distribution network, determining whether the faulty area is restored to power by the grid-connected energy storage converter; When it is determined that the fault area is restored by the grid-building energy storage converter, the restored area in the switch tree structure is islanded according to a preset grid-building restoration mode to obtain a grid-building restoration island area; The grid-building energy storage converter is used to provide inverting power to the grid-building power restoration island area until the fault of the distribution network is eliminated, and then the grid-connected power restoration island area is connected to the grid for power supply.

2. The method for power restoration of a main distribution and coordinated island reconstruction according to claim 1 is characterized in that: The method of constructing the automatic switches on the multiple lines of the distribution network into a switch tree structure with a tree connection relationship according to the line connection relationship of the distribution network includes: Obtaining the operating status of all automatic switches on the distribution network, as well as the operating status of the grid-connected energy storage converter and distributed energy; According to the line connection relationship of the distribution network, the busbar of the distribution network is taken as the root, and the path from the access point where the network-building energy storage converter is connected to the distribution network to the root node switch is listed as the trunk path; wherein the root node switch is the automation switch closest to the busbar of the distribution network on the line where the network-building energy storage converter is located; According to the line connection relationship of the distribution network, the lines where the devices on the distribution network other than the grid-building energy storage inverter are located are determined as branch paths derived from the trunk path, and the access point where the distributed energy or load is connected to the distribution network is used as the end of the branch path to construct a switch tree structure.

3. The method for power restoration of a main distribution and coordinated island reconstruction according to claim 2 is characterized in that: Also includes: Real-time collection of busbars on the switch tree structure and voltage and current information of all automated switches; Determine whether the automatic switches on the distribution network lose voltage according to the voltage information of the busbar, and the voltage information and current information of all automatic switches; When it is determined that the automatic switch on the distribution network loses pressure, it is determined that the distribution network fails, and the automatic switch that loses pressure is determined as the pressure-losing switch; When it is determined that the automatic switch on the distribution network has not lost voltage, the process proceeds to the step of real-time acquisition of voltage information and current information of the busbars on the switch tree structure and all the automatic switches.

4. The method for power restoration of a main distribution and coordinated island reconstruction according to claim 3 is characterized in that: The determining whether the fault area is restored by the grid-connected energy storage converter comprises: Determine whether the voltage loss switch is an off-grid analysis switch; wherein the off-grid analysis switch is an automated switch on the trunk path within the switch tree structure; When it is determined that the pressure loss switch is the off-grid analysis switch, it is determined that the fault area is restored to power by the grid-connected energy storage converter; When it is determined that the voltage loss switch is not the off-grid analysis switch, it is determined that the fault area cannot be restored to power by the grid-connected energy storage converter.

5. The method for power restoration of a main distribution and coordinated island reconstruction according to claim 4 is characterized in that: The power restoration area in the switch tree structure is divided into islands according to the preset network construction and power restoration mode to obtain the network construction and power restoration island areas, including: Determine whether the pressure loss switch has a protection action signal sent to the master station; If it is determined that the undervoltage switch has a protection action signal sent to the master station, it is determined to be a fault in the undervoltage area, and the power restoration switch is determined according to the location of the fault area; If it is determined that the voltage loss switch has no protection action signal sent to the master station, it is determined to be a fault in the non-voltage loss area, and the automatic switch downstream of the bus is determined to be a power restoration switch; Based on the preset networking and power restoration mode, the power restoration area in the switch tree structure is islanded according to the power restoration switch to obtain the networking and power restoration island area.

6. The method for power restoration of a main distribution and coordinated island reconstruction according to claim 5 is characterized in that: Determining a power restoration switch according to the location of the fault area includes: The automation switch that is farthest from the root node switch and sends the protection action signal to the master station is determined as the upper boundary of the fault area, the automation switch that is closest to the downstream of the upper boundary of the fault area is determined as the lower boundary of the fault area, and the area formed by the upper boundary of the fault area and the lower boundary of the fault area is used as the fault area; Determining whether the fault area is on a trunk path on the switch tree structure; When it is determined that the fault area is not on the trunk path of the switch tree structure, isolation and power restoration processing is performed according to the end fault mode; When it is determined that the fault area is on the trunk path on the switch tree structure, it is determined whether the fault area coincides with the access point of the grid-connected energy storage converter; When it is determined that the fault area coincides with the access point of the grid-connected energy storage converter, all downstream automatic switches of the fault area are used as power restoration switches; When it is determined that the fault area does not coincide with the access point of the grid-connected energy storage converter, the process ends.

7. The method for power restoration of an isolated island by coordinated power distribution and master distribution according to claim 5 is characterized in that: The preset network restoration mode includes a maximum range restoration mode, a longest support time restoration mode, and a specified support time restoration mode; When the preset network restoration mode is the maximum range restoration mode, the restoration area in the switch tree structure is islanded according to the restoration switch, including: Sorting the plurality of the power recovery switches from near to far from the root node switch, and determining the maximum load current of each power recovery switch according to the sorting result; Determine whether the maximum load current of the power restoration switch is greater than a predetermined maximum power supply current value, and use the power restoration switch whose maximum load current is greater than the predetermined maximum power supply current value as a power restoration area division switch; The switch tree structure is isolated and islanded according to the switch for dividing the power restoration area, so as to obtain the network power restoration island area; When the preset network restoration mode is the longest support time restoration mode, the restoration area in the switch tree structure is islanded according to the restoration switch, including: Screen out the power restoration switches whose maximum load current is less than the predetermined maximum supply current value as candidate power restoration area division switches; Select the candidate power restoration area division switch with the smallest historical average load integrated electricity as the power restoration area division switch; The switch tree structure is isolated and islanded according to the switch for dividing the power restoration area, so as to obtain the network power restoration island area; When the preset network construction and power restoration mode is a designated support duration power restoration mode, the power restoration area in the switch tree structure is islanded according to the power restoration switch, including: Sorting the plurality of the power recovery switches from near to far from the root node switch, and determining the maximum load current of each power recovery switch according to the sorting result; Determine whether the maximum value of the historical load current of the power restoration switch is less than a predetermined maximum power supply current value, and use the power restoration switch whose maximum value of the historical load current is less than the predetermined maximum power supply current value as a candidate power restoration area division switch; The candidate power restoration area division switch whose average integrated power quantity in the historical power outage period is less than or equal to the energy storage quantity of the grid-building energy storage converter is used as the power restoration area division switch; The switch tree structure is isolated and islanded according to the power restoration area division switch to obtain the network power restoration island area.

8. A main distribution coordinated island reconstruction and power restoration system, characterized in that: include: A tree structure construction module, used to construct the automatic switches on multiple lines of the distribution network into a switch tree structure with a tree connection relationship according to the line connection relationship of the distribution network; A power restoration judgment module, used to judge whether the faulty area is restored by the grid-building energy storage converter when a fault occurs in the distribution network; An island division module is used to divide the power restoration area in the switch tree structure into islands according to a preset power restoration mode to obtain a power restoration island area when it is determined that the fault area is restored by the network energy storage converter; The power restoration module is used to perform inversion power supply to the grid-building power restoration island area through the grid-building energy storage converter until the fault of the distribution network is eliminated, and then the grid-connected power supply to the grid-building power restoration island area is performed.

9. An electronic device, characterized in that: The electronic device includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the main and distribution coordinated island reconstruction and power restoration method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the steps of the main and distribution coordinated island reconstruction and power restoration method as described in any one of claims 1 to 7 are implemented.

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