Power distribution network equivalent model establishment method, device, system, equipment, medium and product

Abstract

The embodiment of the invention discloses a power distribution network equivalent model establishment method, device, system, equipment, medium and product, and the method comprises the steps: determining a connection relation between power distribution network elements which comprise distributed power supplies, and taking the power distribution network elements as model nodes of an equivalent model corresponding to a multi-source power distribution looped network diagram; and determining positive and negative directions and on-off states of active power of the model nodes according to the power distribution telemetry data, performing topology analysis on the multi-source power distribution looped network diagram, determining a flow path of the active power between the model nodes, and determining an equivalent model corresponding to the multi-source power distribution looped network diagram. According to the technical scheme provided by the embodiment of the invention, the problem that the current power flow analysis of the power distribution network containing the distributed power supply is not accurate enough is solved, and the flow path of the active power in the power distribution network with the distributed power supply can be determined and the equivalent model is established by obtaining the telemetry data and carrying out topology analysis; and the effectiveness of the power flow analysis of the power distribution network comprising the distributed power supply is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of distribution network dispatching, and in particular to a method, device, system, equipment, medium and product for establishing an equivalent model of a distribution network. Background Art

[0002] With the construction of new power systems, the number of distributed power sources connected to distribution networks is increasing day by day, and distribution networks are gradually forming a multi-terminal network with multiple power users interconnected. The grid flow, that is, the active power, is no longer a one-way flow from the substation bus to the feeder users, but there is a flow from the power user side to the feeder side.

[0003] Currently, the power flow analysis of distribution networks containing distributed generation is not accurate enough and cannot be applied to complex scenarios of power grid dispatching. Summary of the invention

[0004] The embodiments of the present invention provide a method, apparatus, system, equipment, medium and product for establishing an equivalent model of a distribution network. By acquiring telemetry data and performing topological analysis, the flow path of active power in a distribution network with distributed power sources can be determined and an equivalent model can be established, thereby improving the effectiveness of power flow analysis of a distribution network including distributed power sources.

[0005] In a first aspect, an embodiment of the present invention provides a method for establishing an equivalent model of a distribution network, the method comprising:

[0006] Obtaining a single-line diagram of a distribution network, and performing a topological analysis on the single-line diagram of the distribution network to determine the connection relationship between the distribution network elements and the distribution network elements in the single-line diagram of the distribution network, wherein the distribution network elements include distributed power sources;

[0007] A multi-source power distribution ring network diagram is obtained according to the distribution network elements and connection relationships, and the distribution network elements are used as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram;

[0008] Obtain the power distribution telemetry data of the model node, and determine the positive and negative direction and switch state of the active power of the model node according to the power distribution telemetry data;

[0009] According to the positive and negative directions of active power, a topological analysis is performed on the multi-source distribution ring network diagram to determine the flow path of active power between model nodes;

[0010] According to the flow path, model nodes and switch status, the equivalent model corresponding to the multi-source distribution ring network diagram is determined.

[0011] In a second aspect, an embodiment of the present invention provides a device for establishing an equivalent model of a distribution network, the device comprising:

[0012] A distribution network single-line diagram acquisition module is used to acquire a distribution network single-line diagram and perform topological analysis on the distribution network single-line diagram to determine the distribution network elements in the distribution network single-line diagram and the connection relationship between the distribution network elements, wherein the distribution network elements include distributed power sources;

[0013] A model node determination module is used to obtain a multi-source power distribution ring network diagram according to the distribution network elements and connection relationships, and use the distribution network elements as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram;

[0014] The distribution telemetry data acquisition module is used to acquire the distribution telemetry data of the model node and determine the positive and negative direction of the active power and the switch state of the model node according to the distribution telemetry data;

[0015] A flow path determination module is used to perform topological analysis on a multi-source power distribution ring network diagram according to the positive and negative directions of the active power, and determine the flow path of the active power between the model nodes;

[0016] The equivalent model determination module is used to determine the equivalent model corresponding to the multi-source distribution ring network diagram according to the flow path, model nodes and switch status.

[0017] In a third aspect, an embodiment of the present invention further provides a computer device, the computer device comprising:

[0018] one or more processors;

[0019] A memory for storing one or more programs;

[0020] When the above one or more programs are executed by one or more processors, the above one or more processors implement the method for establishing a distribution network equivalent model as provided in any embodiment of the present invention.

[0021] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for establishing a distribution network equivalent model as provided in any embodiment of the present invention.

[0022] In a fifth aspect, an embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements a method for establishing a distribution network equivalent model as provided in any embodiment of the present invention.

[0023] The embodiments of the above invention have the following advantages or beneficial effects:

[0024] The embodiment of the present invention determines the connection relationship between the distribution network elements, the distribution network elements include distributed power sources, and uses the distribution network elements as model nodes of the equivalent model corresponding to the multi-source distribution ring network diagram; determines the positive and negative directions and switch states of the active power of the model nodes according to the distribution telemetry data, performs a topological analysis on the multi-source distribution ring network diagram, determines the flow path of the active power between the model nodes, and determines the equivalent model corresponding to the multi-source distribution ring network diagram. The technical solution of the embodiment of the present invention solves the problem that the current flow analysis of the distribution network containing distributed power sources is not accurate enough. By obtaining telemetry data and performing topological analysis, the flow path of the active power in the distribution network with distributed power sources can be determined and an equivalent model can be established, thereby improving the effectiveness of the flow analysis of the distribution network containing distributed power sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of a method for establishing a distribution network equivalent model provided by an embodiment of the present invention;

[0026] Figure 2 is a flow chart of a method for establishing a distribution network equivalent model provided by an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of a multi-source power distribution ring network diagram provided by an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of a distribution network equivalent model provided by an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of a ticket verification provided by an embodiment of the present invention;

[0030] Figure 6 It is a schematic diagram of a ticket verification provided by an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of an island maintenance model provided by an embodiment of the present invention;

[0032] Figure 8 It is a schematic diagram of an equivalent model establishment and ticket verification process provided by an embodiment of the present invention;

[0033] Fig. 9 is a schematic diagram of an equivalent model with island operation provided by an embodiment of the present invention;

[0034] Fig.10 It is a structural schematic diagram of a distribution network equivalent model establishment device provided by an embodiment of the present invention;

[0035] Fig.11 It is a structural schematic diagram of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] Figure 1 A flow chart of a method for establishing an equivalent model of a distribution network provided in an embodiment of the present invention is applicable to scenarios in which an equivalent model is established for a distribution network. The method can be executed by a distribution network equivalent model establishment device, which can be implemented in software and / or hardware and integrated into a computer device with application development functions.

[0038] like Figure 1 As shown, the method for establishing the distribution network equivalent model of this embodiment includes the following steps:

[0039] S110, obtaining a single-line diagram of the distribution network, and performing a topological analysis on the single-line diagram of the distribution network to determine the connection relationship between the distribution network components and the distribution network components in the single-line diagram of the distribution network.

[0040] Among them, the distribution network elements include distributed power sources.

[0041] The distribution network single-line diagram model is obtained from the distribution network OCS (Distribution Network Operation Control System), and a topological search is performed on the diagram model based on a topological algorithm such as a depth-first search algorithm, starting from the station-end switch of the single-line diagram to the end of the line, including the path of the tie switch, and the graphic element information of each distribution network component is obtained. The distributed power supply component is located from the graphic element information according to the distribution attribute value, and then the distributed power supply component is used as the starting point to perform topological tracing to the grid side, and the switch closest to the power supply component is obtained and defined as the distributed power supply switch.

[0042] Distribution network components may also include station-end power supplies, distributed power switches, section switches, user switches and tie switches.

[0043] S120. Obtain a multi-source power distribution ring network diagram according to the power distribution network elements and connection relationships, and use the power distribution network elements as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram.

[0044] A multi-source distribution ring network diagram is obtained based on the distribution network elements and connection relationships. The multi-source distribution ring network diagram can display a distribution network powered by multiple power sources. The distribution network elements are used as model nodes of the equivalent model corresponding to the multi-source distribution ring network diagram. One distribution network element corresponds to one model node, such as distributed switch element A corresponds to distributed switch node A.

[0045] S130, acquiring power distribution telemetry data of the model node, and determining the positive and negative direction and switch state of the active power of the model node according to the power distribution telemetry data.

[0046] The distribution telemetry data and ledger data of the model node can be obtained, and the positive and negative directions of the active power and the switch status of the model node can be determined based on the distribution telemetry data. The name of the model node can be identified based on the ledger data, and for user switches, the associated distributed power users can be identified.

[0047] When generating the model nodes of the equivalent model in step S120, the user switch and the distributed power user associated with the user switch are taken as one user switch node.

[0048] Determining the positive and negative directions of active power may be to define the direction of transmitting electric energy from the substation-end power supply to the load as the positive direction of active power. For example, when the substation-end power supply transmits electric energy to the power grid, its active power is positive. On the contrary, when the device or component absorbs active power from the power grid, the active power is negative. In this embodiment, the positive and negative directions of active power can be determined based on whether each model node sends active power back to the substation-end power supply bus.

[0049] S140. Perform a topological analysis on the multi-source power distribution ring network diagram according to the positive and negative directions of the active power, and determine the flow path of the active power between the model nodes.

[0050] The positive and negative directions of active power are used as labels for topological search. The power supply path is quickly obtained according to the flow direction, that is, the active power direction, to reduce the amount of invalid search calculations. The breadth-first search algorithm is used to perform topological analysis on the multi-source distribution ring network diagram, and the paths are tracked from two directions. One is to perform topological tracking from the negative node to the positive direction, and the positive node can be searched. In the form of a multi-source network, multiple positive nodes may be searched. Therefore, according to the breadth-first search algorithm, if the positive node is searched along the secondary path, the search in this direction will continue. If the negative node is searched, the search in this direction will be stopped. The second is to perform topological tracking from each positive node to the negative node until the end of the negative node path, and the power supply range of each positive node can be searched.

[0051] S150. Determine an equivalent model corresponding to the multi-source power distribution ring network diagram according to the flow path, model nodes and switch states.

[0052] The switch state of the model node can be identified by color, text or symbol. Directed arrows are used to indicate the flow path of active power between model nodes to determine the equivalent model corresponding to the multi-source distribution ring network diagram. It is understandable that the equivalent model can be an equivalent model in normal operating state, powered by the substation-end power supply, or powered by the substation-end power supply and distributed power supply together. Of course, it can also be an equivalent model in an island operation state, that is, at least one model node is in a closed state, resulting in an operating state in which part or all of the power supply range of the equivalent model is only powered by distributed power supply nodes.

[0053] The technical solution of this embodiment determines the connection relationship between the distribution network elements and the distribution network elements in the distribution network single-line diagram by performing topological analysis on the distribution network single-line diagram, wherein the distribution network elements include distributed power sources; obtains a multi-source distribution ring network diagram according to the distribution network elements and the connection relationship, and uses the distribution network elements as model nodes of an equivalent model corresponding to the multi-source distribution ring network diagram; obtains the distribution telemetry data of the model node, and determines the positive and negative directions and switch states of the active power of the model node according to the distribution telemetry data; determines the flow path of the active power between the model nodes according to the positive and negative directions of the active power; determines the equivalent model corresponding to the multi-source distribution ring network diagram according to the flow path, the model node and the switch state. The technical solution of the embodiment of the present invention solves the problem that the current flow analysis of the distribution network containing distributed power sources is not accurate enough. By obtaining telemetry data and performing topological analysis, the flow path of the active power in the distribution network with distributed power sources can be determined and an equivalent model can be established, thereby improving the effectiveness of the flow analysis of the distribution network containing distributed power sources.

[0054] Figure 2 This is a flow chart of a method for establishing a distribution network equivalent model provided by an embodiment of the present invention. This embodiment and the method for establishing a distribution network equivalent model in the above embodiment belong to the same inventive concept, and further describes the process of verifying the ticket through the equivalent model. The method can be executed by a distribution network equivalent model establishment device, which can be implemented by software and / or hardware and integrated into a computer device with application development function.

[0055] like Figure 2 As shown, the method for establishing the distribution network equivalent model of this embodiment includes the following steps:

[0056] S210, obtaining a distribution network single-line diagram, and performing a topological analysis on the distribution network single-line diagram to determine the connection relationship between the distribution network elements and the distribution network elements in the distribution network single-line diagram, wherein the distribution network elements include distributed power sources.

[0057] S220. Obtain a multi-source power distribution ring network diagram according to the distribution network elements and connection relationships, and use the distribution network elements as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram.

[0058] like Figure 3 As shown, Figure 3 It is a schematic diagram of a multi-source distribution ring network diagram. Taking feeders as units, the distribution network elements with connection relationships obtained by topological tracing can be collected, including five types of switch elements such as substation-end power supply, distributed power supply switch, section switch, user switch and tie switch. Their ledgers and distribution telemetry data can be associated, and the above distribution network elements are used as model nodes of the equivalent model corresponding to the multi-source distribution ring network diagram.

[0059] S230, obtaining the power distribution telemetry data of the model node, and determining the positive and negative direction and the switch state of the active power of the model node according to the power distribution telemetry data.

[0060] Obtain the distribution telemetry data of the model nodes in real time, associate the distribution telemetry data of the model nodes, and obtain the positive and negative direction and switch status of the active power data. Figure 3 The equivalent model corresponding to the multi-source distribution ring network diagram shown in FIG. 1 and the positive and negative directions of the active power data of each model node are shown in Table 1.

[0061] Table 1

[0062]

[0063] S240. Perform a topological analysis on the multi-source power distribution ring network diagram according to the positive and negative directions of the active power to determine the flow path of the active power between the model nodes.

[0064] S250: Determine an equivalent model corresponding to the multi-source power distribution ring network diagram according to the flow path, model nodes and switch states.

[0065] like Figure 4 As shown, Figure 4 for Figure 3 The equivalent model corresponding to the multi-source distribution ring network diagram shown. Figure 4 The switching state of the tie switch A4 is described in words, and the flow path of the active power between each model node is described by directional arrows.

[0066] S260. Obtain the ticket operation information generated by the user based on the graphic model operation of the distribution network components, and perform semantic verification on the ticket operation information.

[0067] For line maintenance scenarios, users order the implementation of safety measures through draft tickets. The dispatcher selects the diagram model at the main site, determines the equipment ledger name, and then selects the initial and target states. The distribution network OCS determines the target state of the target operation distribution network element and its line side by interpreting the semantic rules of each operation step in the ticket (equipment ledger name + XX side (if any) + "by" + initial state + "transfer" + target state). The target state can include cold standby, maintenance and operation. The structured semantic rules and sequence of each operation step in the ticket operation information are verified through semantic verification.

[0068] S270. When the ticket operation information passes the semantic verification, obtain the target switch state of the target operation node indicated by the ticket operation information in the equivalent model.

[0069] The target switch state is the switch state corresponding to the target state in the operation step. For example, operation corresponds to the open state, maintenance corresponds to the closed state, etc. The following describes the process of obtaining the target switch state through two examples of ticket content. Ticket content example 1:

[0070] The first step: A0 switch changes from operation to cold standby → A0 switch is in the open position, that is, the target state is the switch closed state (the arrow "→" is followed by the step analysis content); the second step: B4 switch changes from operation to cold standby → B4 switch is in the open position; the third step: A0 switch changes from cold standby to maintenance on the A1 line side → A0 switch is under maintenance on the right side, that is, the target state is the switch closed state; the fourth step: B4 switch changes from cold standby to maintenance on the A4 line side → B4 switch is under maintenance on the left side.

[0071] Example 2 of ticket content:

[0072] Step 1: A0 switch changes from operation to cold standby → A0 switch open position; Step 2: B4 switch changes from operation to cold standby → B4 switch open position; Step 3: G1 switch changes from operation to cold standby → G1 switch open position; Step 4: G1 switch load side changes from cold standby to maintenance → G1 switch load side maintenance; Step 5: A0 switch on the A1 line side changes from cold standby to maintenance → A0 switch right side maintenance; Step 6: B4 switch on the A4 line side changes from cold standby to maintenance → B4 switch left side maintenance.

[0073] S280, performing topological analysis starting from the maintenance model node in the target operation node, determining the maintenance range corresponding to the maintenance model node, and adjusting the equivalent model based on the maintenance range and the target switch state to obtain a simulated maintenance model.

[0074] The maintenance model node is the model node corresponding to the maintenance distribution network element. The master station starts topology tracking from the endpoints on the maintenance tag side of the maintenance model nodes A0 and A4, and marks the maintenance range tracked by the topology on the equivalent model, such as Figure 5 As shown, the model node portion of the maintenance range is intercepted on the equivalent model, and the maintenance label is marked on the line side of the maintenance model node to obtain a simulated maintenance model. It can be understood that the simulated maintenance model is different from the above-mentioned equivalent model. The switch state of the maintenance node of the simulated maintenance model is the target switch state corresponding to the ticket information, which is different from the current actual situation. This embodiment takes into account the safety of maintenance operations of multi-source distribution networks, and adds a ticket verification logic based on this equivalent model. Through the simulated maintenance model, the power supply status of the distribution network after the operation steps in the ticket are simulated.

[0075] S290, identifying whether there are distributed power supply nodes in the model nodes within the maintenance range of the simulated maintenance model, and entering the ticket verification process corresponding to the identification result.

[0076] like Figure 5 As shown, the topology tracing starts from the endpoints on the maintenance label side of the maintenance model nodes A0 and B4, and ends when all branches are traveled. It is identified whether there are distributed power generation nodes in the model nodes within the maintenance range in the simulated maintenance model, or as Figure 6 As shown, according to the identification results, topology tracking starts from the endpoints on the maintenance label side of the maintenance model nodes A0, A1, B0 and B1 and ends when all branches are traversed to identify whether there are distributed power supply nodes in the model nodes within the maintenance range in the simulated maintenance model, that is, whether the distributed power supply nodes exist or not, and the corresponding ticket verification process is performed.

[0077] In an optional embodiment, entering the ticket verification process corresponding to the identification result can be that when the identification result is that a distributed power supply node exists, determining whether the distributed power supply node is turned on, if not, passing the ticket verification; and, when the identification result is that there is no distributed power supply node, and there is a distributed power supply node in the non-maintenance range, determining that the distributed power supply node enters the island operation mode, and determining the power supply range of the distributed power supply entering the island operation mode through topological analysis; adjusting the simulated maintenance model according to the power supply range to obtain an island maintenance model; and performing an island operation safety check on the island maintenance model, and if it passes, passing the ticket verification.

[0078] For example, Figure 5 As shown in the figure, the identification maintenance range includes the distributed power switch node G1, and the G1 switch is in the closed position, and there is no maintenance on the line side, then the output fails the ticket verification. Figure 5 The identification result is that there is a distributed power node, that is, the distributed power switch node G1, and the G1 switch has been opened, and the line side is turned over for maintenance, then it passes the ticket verification. This shows that the safety measures for deploying distributed power sources in this ticket meet the safety measures requirements of this maintenance scenario.

[0079] And as Figure 6 As shown, when the identification result is that there is no distributed power supply node, it means that the model nodes outside the maintenance range can be operated in an island mode through the distributed power supply, and the distributed power supply nodes are determined to enter the island operation mode, and the power supply range of the distributed power supply nodes entering the island operation mode is determined by the distributed power supply node topology analysis.

[0080] In the simulation maintenance model, the island operation range corresponding to the power supply range of the distributed power generation node is marked by a closed curve, and the following is obtained: Figure 6 The island maintenance model is shown. The operation safety check of the island maintenance model can be specifically performed by analyzing whether the island operation is safe based on the output power capacity of the distributed power generation node and the load power capacity of the load node in the model node within the power supply range.

[0081] It is understandable that the equivalent model of S210-S250 can be updated in real time based on the distribution telemetry data and switch status of the model nodes acquired in real time. For example, if some nodes are shut down due to a fault, the equivalent model can be re-established based on the updated node switch status. And in the case where the multi-source distribution ring network has island operation due to the closure of some nodes, for the equivalent model with island operation, the same island safety operation verification as the island maintenance model can also be performed.

[0082] Moreover, in terms of line coloring, the traditional topology tracking starts from the substation. When the distributed power source is in an island operation mode, it will be displayed green (power outage) due to the topology interruption between it and the substation end, which is inconsistent with the actual situation. In this embodiment, when the active direction of the distributed power switch is negative, the topology tracking is carried out from the distributed power switch to the load side, and the island power supply path can be identified as energized and colored red.

[0083] In an optional implementation, performing an island operation safety check on the island maintenance model may include determining the output power capacity of the distributed power supply node in the island maintenance model and the load power capacity of the load node in the model node within the power supply range; calculating the difference between the load power capacity and the output power capacity, and when the difference is less than 0, judging that the island operation state indicated by the island maintenance model passes the island operation safety check; and, when the difference is greater than 0, opening the standby switch element corresponding to the standby switch node in the model node.

[0084] like Figure 6 As shown. After the master station passes the semantic rule verification, the endpoint on the maintenance tag side starts topology tracking and verifies that there are no distributed power sources in the two maintenance sections, and the verification passes. It is identified that the distributed power sources G1 and G2 outside the maintenance section are operating in an isolated mode, and the island operation safety verification logic is enabled. The output power capacity S of the distributed power sources in the island is obtained through analysis. 源, the load power capacity S of each user switch node 荷i , total load capacity S 总荷 Size relationship. When S 源 总荷 When the capacity difference S 差 =S 总荷 -S 源 >0, if a backup power switch is found in the island, the switch will be automatically closed to supply power to the island load.

[0085] For example, in order to ensure the island operation mode, the topology analysis is focused on the path between the distributed power source and the load. If the topology search shows that there is a tie switch A4 in the island, and the tie switch can be traced to the switch at the substation end of the opposite line, that is, this path is not interrupted, then this tie switch is defined as the backup power switch. 差 =S 总荷 -S 源 >0, close the A4 switch to supply power to the island load.

[0086] In an optional embodiment, when the backup switch element is successfully turned on, the backup switch node in the island maintenance model is determined to be in the on state, and the island maintenance model is updated according to the on state of the backup switch node; the difference between the load power capacity and the output power capacity of the updated island maintenance model is recalculated, and when the difference is less than 0, it is determined that the island operation state indicated by the island maintenance model passes the island operation safety check.

[0087] like Figure 7 As shown in the figure, the A4 switch is turned on successfully, and the switch state of the standby switch node A4 in the island maintenance model is updated. With the opening state of the A4 switch, the two independent islands, namely the G1 power supply island and the G2 power supply island, are merged into a new island. The difference between the load power capacity and the output power capacity of the new island is recalculated, and the total distributed power capacity, namely the sum of the output power capacity of G1 and G2, is calculated to be 500+500=1000kW, and the total load power is the sum of the power of A3, M1, M5, M3 and B3, which is 150+200+150+200+200=700kVA, which satisfies the difference less than 0, and there is no need to close the standby power switch or cut off the load. And if the safety operation check fails, the dispatcher still executes according to the above point diagram ticket, that is, under the condition that there is no step of closing the A4 switch, the system will still automatically close the A4 switch to ensure the stable operation of the island.

[0088] ​In an optional embodiment, when the backup switch element fails to start, or the backup switch element fails to pass the island operation safety check after being successfully started, determine the load nodes to be closed in the load nodes in the island maintenance model that are greater than the difference; determine the load node to be closed with the smallest load power capacity as the target closed load node; close the target load distribution network element corresponding to the target closed load node, and determine that the target closed load node is in a closed state, and update the island maintenance model based on the closed state of the target closed load node; recalculate the difference between the load power capacity and the output power capacity of the updated island maintenance model, and when the difference is less than 0, determine that the island operation state indicated by the updated island maintenance model passes the island operation safety check.

[0089] for Figure 6 , assuming the user switch node is i, the calculation formula for removing the switch is:

[0090]

[0091] Then the minimum value f(S 荷i )The corresponding user switch i is the cut-off switch.

[0092] The calculated distributed power source G1 island content capacity difference is less than 0, and the island safety operation verification is passed. The distributed power source G2 island content capacity difference is greater than 0, and the island safety verification fails. If the island safety operation verification passes, the ticket verification passes.

[0093] According to the third step logic, when S 源 总荷 When the capacity difference S 差 =S 总荷 -S 源 >0, if a backup power switch (such as A4 switch) is found in the island, the A4 switch will be automatically closed by remote control to supply power to the island load. When the logic of closing the backup switch or cutting off the load is enabled, the analog equivalent model V2.0 is automatically generated. (Note: The equivalent model V2.0 is the analog power grid form calculated after the island safety operation logic verification, which realizes the secondary conversion of the equivalent model and serves as the basic model for error prevention verification)

[0094] Then perform the capacity difference calculation. Figure 7 As shown in Figure 1, it is the island maintenance model of island operation after closing the A4 switch. The total distributed generation capacity S is calculated. 源 =500+500=1000kW, the total load S 总荷 150+200+150+200+200=700kVA, S 差 =S 总荷 -S 源 ​<0, the conditions are met, and there is no need to close the standby power switch or cut off the load. If the ticket verification shows that the safety operation verification fails, if the dispatcher still executes the failed ticket, that is, without closing the A4 switch, the system will automatically close the A4 switch to ensure the stable operation of the island.

[0095] This embodiment can identify and determine the island maintenance model, and based on the analysis of the island maintenance model, effectively verify the safety of island operation and the safety of maintenance tickets.

[0096] The technical solution of this embodiment obtains the ticket operation information generated by the user based on the graphical operation of the distribution network elements, and performs semantic verification on the ticket operation information; when the ticket operation information passes the semantic verification, obtains the target switch state of the target operation node indicated by the ticket operation information in the equivalent model; performs topological analysis starting from the maintenance model node in the target operation node, determines the maintenance range corresponding to the maintenance model node, and adjusts the equivalent model based on the maintenance range and the target switch state to obtain a simulated maintenance model; identifies whether there are distributed power supply nodes in the model nodes within the maintenance range in the simulated maintenance model, and enters the ticket verification process corresponding to the identification result. The technical solution of the embodiment of the present invention solves the problem that the current flow analysis of the distribution network containing distributed power sources is not accurate enough. It can obtain telemetry data and perform topological analysis to determine the flow path of active power in the distribution network with distributed power sources and establish an equivalent model, thereby improving the effectiveness of the flow analysis of the distribution network containing distributed power sources, and can establish a simulated maintenance model to simulate the actual state after execution before executing the ticket for more effective verification, thereby ensuring the safety of the distribution network operation.

[0097] like Figure 8 As shown, in a preferred embodiment of the present invention, the equivalent model establishment and ticket verification process may include the following steps S1-S14:

[0098] S1. Generate a distribution ring network diagram containing distributed power sources based on the existing distribution network single-line diagram. S2. Obtain topological relationships, station-end power sources, distributed power sources, sections, users, interconnection switch relationships and flow data. S3. Establish an equivalent model based on the topological relationship and flow direction and execute S4 or S10. S4. Establish an equivalent model that adapts to the island operation mode. S5. Define the main and standby power switches and obtain the power and load capacity. S6. Check whether the island safety operation conditions are met. If so, the output passes the safety check (check). Otherwise, execute step S7. S7. Determine whether there is a standby power switch. If so, execute step S8. If not, execute step S9. S8. Close the standby power switch and generate a new version of the equivalent model, and execute step S6 based on the new version of the equivalent model. S9. Generate a new version of the equivalent model based on the calculated switch as the designated cut-off switch and execute step S6. S10, ticket verification based on the simulation state equivalent model of the maintenance scenario S11, determine whether the ticket meets the semantic rule verification S12, simulate the setting and generate the simulation state equivalent model, that is, the simulation maintenance model S13, determine whether the topology error prevention verification is met, that is, whether there is a distributed power supply in the maintenance section, if not, execute S14. S14, determine whether the non-maintenance section involves distributed power supplies, if so, execute step S6.

[0099] The following is an example to illustrate the process of steps S4-S9.

[0100] In actual operation, when a distribution network containing distributed generation adjusts a special operation mode due to a fault, some switches in the feeder will be disconnected or closed, and the main power supply of some segments in the feeder may change, and some segments may also be powered by distributed generation with island operation capability. According to the above principle of establishing an equivalent model, the equivalent model diagram and the associated key node data characteristics are re-established according to the real-time state.

[0101] In an island system, if the capacity of the distributed power source is greater than the system load capacity, the steady-state voltage and system frequency will rise, and the protection device will cut off the distributed power source. If the capacity of the distributed power source is less than the load capacity in the system, it is necessary to cut off the excess load to ensure system stability. In order to ensure the operation mode of the island, the equivalent model focuses on the topological analysis of the path between the distributed power source and the load. If the topological search shows that there is a connecting switch in the island, and the connecting switch can be traced to the switch at the substation end of the opposite line, that is, this path is not interrupted, then this connecting switch is defined as a backup power switch. The relationship between the capacity of the distributed power source S source, the capacity of each user switch node S load i, and the total load capacity S total load in the island is obtained through analysis. When S 源 总荷 When the capacity difference S 差 =S 总荷 -S 源 ​>0, if a backup power switch is found in the island, close the switch to supply the island load. Otherwise, the load needs to be cut off. Let the user switch node be i, and the calculation formula for cutting off the switch is:

[0102]

[0103] Then the minimum value f(S 荷i )The corresponding user switch i is the cut-off switch.

[0104] like Figure 3 In the multi-source power distribution ring network diagram shown in the figure, the switch section B0 to B1 fails, the switches B0 and B1 are disconnected, the switch section B1 to A4 is powered by the G2 power supply in an island operation mode, the switch path A4 to A0 is not interrupted, A4 is defined as the backup power switch, and the switch path B1 to B0 is interrupted, so B1 is not the backup power switch. The equivalent model is re-established as follows Fig. 9 According to the island topology, the capacity of M3, B3, and M5 is compared with the capacity of G2, and the difference S 差 =S 总荷 -S 源 =200+200+150-500=50>0. Then the distribution network OCS remotely closes the A4 backup power switch to supply power to the island load. In the test, the A4 switch remote control fails. At this time, the distribution network OCS starts the load shedding logic. According to formula (1), f(S 荷i ) corresponds to the M5 switch, so the distribution network OCS remotely disconnects the M5 switch and controls S 差 ≤0, the island can operate stably.

[0105] Fig.10 The present invention provides a schematic diagram of a device for establishing an equivalent model of a distribution network. This embodiment is applicable to scenarios where an equivalent model is established for a distribution network. The device for establishing an equivalent model of a distribution network can be implemented by software and / or hardware and integrated into a computer terminal device with application development functions.

[0106] like Fig.10 As shown, the distribution network equivalent model establishment device includes: a distribution network single-line diagram acquisition module 310, a model node determination module 320, a distribution telemetry data acquisition module 330, a flow path determination module 340 and an equivalent model determination module 350.

[0107] Among them, the distribution network single-line diagram acquisition module 310 is used to obtain the distribution network single-line diagram, and perform topological analysis on the distribution network single-line diagram to determine the distribution network elements in the distribution network single-line diagram and the connection relationship between the distribution network elements, wherein the distribution network elements include distributed power sources; the model node determination module 320 is used to obtain the multi-source distribution ring network diagram according to the distribution network elements and the connection relationship, and use the distribution network elements as the model nodes of the equivalent model corresponding to the multi-source distribution ring network diagram; the distribution telemetry data acquisition module 330 is used to obtain the distribution telemetry data of the model node, and determine the positive and negative directions and switch states of the active power of the model node according to the distribution telemetry data; the flow path determination module 340 is used to perform topological analysis on the multi-source distribution ring network diagram according to the positive and negative directions of the active power, and determine the flow path of the active power between the model nodes; the equivalent model determination module 350 is used to determine the equivalent model corresponding to the multi-source distribution ring network diagram according to the flow path, model nodes and switch states.

[0108] The technical solution of this embodiment is to obtain a single-line diagram of the distribution network, and to perform a topological analysis on the single-line diagram of the distribution network to determine the connection relationship between the distribution network elements and the distribution network elements in the single-line diagram of the distribution network, wherein the distribution network elements include distributed power sources; obtain a multi-source distribution ring network diagram according to the distribution network elements and the connection relationship, and use the distribution network elements as model nodes of an equivalent model corresponding to the multi-source distribution ring network diagram; obtain the distribution telemetry data of the model node, and determine the positive and negative directions and switch states of the active power of the model node according to the distribution telemetry data; perform a topological analysis on the multi-source distribution ring network diagram according to the positive and negative directions of the active power, and determine the flow path of the active power between the model nodes; determine the equivalent model corresponding to the multi-source distribution ring network diagram according to the flow path, the model node and the switch state. The technical solution of the embodiment of the present invention solves the problem that the current flow analysis of the distribution network containing distributed power sources is not accurate enough. By obtaining telemetry data and performing a topological analysis, the flow path of the active power in the distribution network with distributed power sources can be determined and an equivalent model can be established, thereby improving the effectiveness of the flow analysis of the distribution network containing distributed power sources.

[0109] In an optional embodiment, the device further comprises:

[0110] The ticket verification module is used to obtain the ticket operation information generated by the user based on the graphical operation of the distribution network components, and perform semantic verification on the ticket operation information; when the ticket operation information passes the semantic verification, the target switch state of the target operation node indicated by the ticket operation information in the equivalent model is obtained; a topological analysis is performed starting from the maintenance model node in the target operation node to determine the maintenance range corresponding to the maintenance model node, and the equivalent model is adjusted based on the maintenance range and the target switch state to obtain a simulated maintenance model; it is identified whether there are distributed power supply nodes in the model nodes within the maintenance range in the simulated maintenance model, and the ticket verification process corresponding to the identification result is entered.

[0111] In an optional implementation, the ticket verification module is specifically used to:

[0112] When the identification result shows that there is a distributed power supply node, determine whether the distributed power supply node is turned on, if not, pass the ticket verification; and, when the identification result shows that there is no distributed power supply node, and there is a distributed power supply node outside the maintenance range, determine that the distributed power supply node enters the island operation mode, and determine the power supply range of the distributed power supply entering the island operation mode through topological analysis; adjust the simulation maintenance model according to the power supply range to obtain the island maintenance model; perform an island operation safety check on the island maintenance model, and if it passes, pass the ticket verification.

[0113] In an optional implementation, the ticket verification module is further used to:

[0114] Determine the output power capacity of the distributed power generation node in the island maintenance model and the load power capacity of the load node in the model node within the power supply range; calculate the difference between the load power capacity and the output power capacity, and when the difference is less than 0, determine that the island operation state indicated by the island maintenance model passes the island operation safety check; and when the difference is greater than 0, open the standby switch element corresponding to the standby switch node in the model node.

[0115] In an optional implementation, the ticket verification module is further used to:

[0116] When the standby switch element is successfully turned on, the standby switch node in the island maintenance model is determined to be in the on state, and the island maintenance model is updated according to the on state of the standby switch node; the difference between the load power capacity and the output power capacity of the updated island maintenance model is recalculated, and when the difference is less than 0, it is determined that the island operation state indicated by the updated island maintenance model passes the island operation safety check.

[0117] In an optional implementation, the ticket verification module is further used to:

[0118] When the standby switch element fails to open, or the standby switch element fails to pass the island operation safety check after being successfully opened, determine the load nodes to be closed that are greater than the difference in the load nodes in the island maintenance model; determine the load node to be closed with the smallest load power capacity as the target closed load node; close the target load distribution network element corresponding to the target closed load node, and determine that the target closed load node is in a closed state, and update the island maintenance model based on the closed state of the target closed load node; recalculate the difference between the load power capacity and the output power capacity of the updated island maintenance model, and when the difference is less than 0, determine that the island operation state indicated by the updated island maintenance model passes the island operation safety check.

[0119] The distribution network equivalent model establishment device provided in the embodiment of the present invention can execute the distribution network equivalent model establishment method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0120] Fig.11 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention. Fig.11 A block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention is shown. Fig.11 The computer device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention. The computer device 12 can be any terminal device with computing capabilities, such as an intelligent controller and server, a mobile phone and other terminal devices.

[0121] like Fig.11 As shown, the computer device 12 is in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that connects various system components (including the system memory 28 and the processing unit 16).

[0122] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0123] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0124] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Fig.11 not shown, usually called a "hard drive"). Although Fig.11 Not shown in the figure, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The system memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0125] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in system memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. Program modules 42 generally perform the functions and / or methods of the embodiments described herein.

[0126] The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboards, pointing devices, displays 24, etc.), one or more devices that enable a user to interact with the computer device 12, and / or any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network cards, modems, etc.). Such communication may be performed via an input / output (I / O) interface 22. Furthermore, the computer device 12 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 20. As shown, the network adapter 20 communicates with the other modules of the computer device 12 via the bus 18. It should be understood that although Fig.11 Not shown, other hardware and / or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RFID systems, tape drives, and data backup storage systems.

[0127] The processing unit 16 executes various functional applications and data processing by running the program stored in the system memory 28, for example, implementing the distribution network equivalent model establishment method provided in the embodiment of the present invention, the method comprising:

[0128] Obtaining a single-line diagram of a distribution network, and performing a topological analysis on the single-line diagram of the distribution network to determine the connection relationship between the distribution network elements and the distribution network elements in the single-line diagram of the distribution network, wherein the distribution network elements include distributed power sources;

[0129] A multi-source power distribution ring network diagram is obtained according to the distribution network elements and connection relationships, and the distribution network elements are used as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram;

[0130] Obtain the power distribution telemetry data of the model node, and determine the positive and negative direction and switch state of the active power of the model node according to the power distribution telemetry data;

[0131] According to the positive and negative directions of active power, a topological analysis is performed on the multi-source distribution ring network diagram to determine the flow path of active power between model nodes;

[0132] According to the flow path, model nodes and switch status, the equivalent model corresponding to the multi-source distribution ring network diagram is determined.

[0133] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the method for establishing a distribution network equivalent model provided in any embodiment of the present invention is implemented. The method includes:

[0134] Obtaining a single-line diagram of a distribution network, and performing a topological analysis on the single-line diagram of the distribution network to determine the connection relationship between the distribution network elements and the distribution network elements in the single-line diagram of the distribution network, wherein the distribution network elements include distributed power sources;

[0135] A multi-source power distribution ring network diagram is obtained according to the distribution network elements and connection relationships, and the distribution network elements are used as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram;

[0136] Obtain the power distribution telemetry data of the model node, and determine the positive and negative direction and switch state of the active power of the model node according to the power distribution telemetry data;

[0137] According to the positive and negative directions of active power, a topological analysis is performed on the multi-source distribution ring network diagram to determine the flow path of active power between model nodes;

[0138] According to the flow path, model nodes and switch status, the equivalent model corresponding to the multi-source distribution ring network diagram is determined.

[0139] The computer storage medium of the embodiment of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to: an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0140] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0141] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0142] Computer program code for performing the operation of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, Python, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate 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 through 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).

[0143] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the method for establishing a distribution network equivalent model as provided in any embodiment of the present application.

[0144] In the process of implementation, the computer program product can be written in one or more programming languages ​​or a combination thereof to perform the computer program code of the present invention, including object-oriented programming languages, such as Java, Smalltalk, Python, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate 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 can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0145] It should be understood by those skilled in the art that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, optionally, they can be implemented by a program code executable by a computer device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0146] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for establishing an equivalent model of a distribution network, characterized in that: include: Obtaining a single-line diagram of a distribution network, and performing a topological analysis on the single-line diagram of the distribution network to determine the connection relationship between the distribution network elements in the single-line diagram of the distribution network and the distribution network elements, wherein the distribution network elements include a distributed power source; Obtain a multi-source power distribution ring network diagram according to the power distribution network elements and the connection relationship, and use the power distribution network elements as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram; Acquire the power distribution telemetry data of the model node, and determine the positive and negative direction and the switch state of the active power of the model node according to the power distribution telemetry data; According to the positive and negative directions of the active power, a topological analysis is performed on the multi-source power distribution ring network diagram to determine a flow path of the active power between the model nodes; An equivalent model corresponding to the multi-source power distribution ring network diagram is determined according to the flow path, the model nodes and the switch status.

2. The method according to claim 1, characterized in that The method also includes: Acquire the ticket operation information generated by the user based on the image model operation of the distribution network element, and perform semantic verification on the ticket operation information; When the ticket operation information passes the semantic verification, obtaining the target switch state of the target operation node indicated by the ticket operation information in the equivalent model; Performing topological analysis starting from the maintenance model node in the target operation node, determining the maintenance range corresponding to the maintenance model node, and adjusting the equivalent model based on the maintenance range and the target switch state to obtain a simulated maintenance model; Identify whether there are distributed power supply nodes in the model nodes within the maintenance range in the simulated maintenance model, and enter the ticket verification process corresponding to the identification result.

3. The method according to claim 2, characterized in that The process of entering the ticket verification process corresponding to the recognition result includes: When the identification result indicates that there is a distributed power source node, determining whether the distributed power source node is turned on, and if not, passing the ticket verification; and, When the identification result is that there is no distributed power supply node, and there is a distributed power supply node in the non-maintenance range, determining that the distributed power supply node enters the island operation mode, and determining the power supply range of the distributed power supply entering the island operation mode through topological analysis; Adjust the simulation maintenance model according to the power supply range to obtain an island maintenance model; The island operation safety check is performed on the island maintenance model, and if it passes, the ticket check is passed.

4. The method according to claim 3, characterized in that The performing of an isolated operation safety check on the isolated maintenance model includes: Determine the output power capacity of the distributed power generation node in the island maintenance model and the load power capacity of the load node in the model node within the power supply range; calculating the difference between the load power capacity and the output power capacity, and when the difference is less than 0, determining that the island operation state indicated by the island maintenance model passes the island operation safety check; and, When the difference is greater than 0, the standby switch element corresponding to the standby switch node in the model node is turned on.

5. The method according to claim 4, characterized in that The method also includes: In the case where the standby switch element is turned on successfully, determining that the standby switch node in the island maintenance model is in an on state, and updating the island maintenance model according to the on state of the standby switch node; The difference between the load power capacity and the output power capacity of the updated island maintenance model is recalculated. When the difference is less than 0, it is determined that the island operation state indicated by the updated island maintenance model passes the island operation safety check.

6. The method according to claim 5, characterized in that The method also includes: In the case where the standby switch element fails to start, or the standby switch element fails to pass the island operation safety check after being successfully started, determining a load node to be shut down that is greater than the difference among the load nodes in the island maintenance model; Determine the load node to be shut down with the smallest load power capacity as the target shut down load node; Shut down the target load distribution network element corresponding to the target shut-down load node, determine that the target shut-down load node is in a shut-down state, and update the island maintenance model based on the shut-down state of the target shut-down load node; The difference between the load power capacity and the output power capacity of the updated island maintenance model is recalculated. When the difference is less than 0, it is determined that the island operation state indicated by the updated island maintenance model passes the island operation safety check.

7. A distribution network equivalent model establishment device, characterized in that: include: A distribution network single-line diagram acquisition module, used to acquire a distribution network single-line diagram, and perform a topological analysis on the distribution network single-line diagram to determine the distribution network elements in the distribution network single-line diagram and the connection relationship between the distribution network elements, wherein the distribution network elements include distributed power sources; A model node determination module, used to obtain a multi-source power distribution ring network diagram according to the distribution network elements and the connection relationship, and use the distribution network elements as model nodes of an equivalent model corresponding to the multi-source power distribution ring network diagram; A power distribution telemetry data acquisition module, used to acquire the power distribution telemetry data of the model node, and determine the positive and negative direction and switch state of the active power of the model node according to the power distribution telemetry data; A flow path determination module, used to perform a topological analysis on the multi-source power distribution ring network diagram according to the positive and negative directions of the active power, and determine the flow path of the active power between the model nodes; An equivalent model determination module is used to determine an equivalent model corresponding to the multi-source power distribution ring network diagram according to the flow path, the model nodes and the switch state.

8. A computer device, characterized in that: The computer device comprises: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method for establishing a distribution network equivalent model as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for establishing an equivalent model of a distribution network as described in any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the computer program implements the method for establishing a distribution network equivalent model as described in any one of claims 1 to 6.

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