Distribution network transfer auxiliary decision system and method based on optimal algorithm

Abstract

The present disclosure proposes a distribution network power transfer auxiliary decision system and method based on an optimal algorithm. The system includes a power supply capacity analysis system and a substation power transfer and series supply decision system. The power supply capacity analysis system is configured to analyze the power supply capacity of the power-lost substation and its affiliated lines based on the feeder ring network topology relationship, and obtain the number of ring network points and line connection relationship. The substation power transfer and series supply decision system is configured to use the iterative solution of the optimal algorithm to make a logical judgment on the power transfer or series supply of the substation power loss based on the line connection relationship, so as to realize the intelligent generation of power transfer or series supply plans after the failure of the key node of the distribution network. After the power loss of the key node of the distribution network, the intelligent generation can provide auxiliary decision-making for fault handling, realize rapid response to the power grid fault, and thus improve the modernization level of the distribution network and the reliability level of power supply service.

Description

Technical Field

[0001] The present disclosure relates to the technical field related to distribution network scheduling, and more specifically, to a distribution network power transfer auxiliary decision-making system and method based on an optimal algorithm. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] In the power distribution network, each substation is a key node and important support on the power supply path. A power outage at a substation means a power outage for the entire station and the loads it carries. Under the current national policy of improving users' "access to electricity" experience and optimizing the electricity business environment, how to quickly resolve power grid failures and improve the efficiency of restoring power supply is an urgent problem to be solved! The inventors found that most of the existing power transfers after power outages at key nodes in the distribution network are done by manual scheduling. Under manual scheduling, it is necessary to comprehensively consider multiple factors such as fault type and power flow transfer. With the expansion of the distribution network scale, the increase in the number of electrical equipment, the increase in the power supply radius, and the complexity of line connection relationships, the efficiency of fault handling is slow, which makes it difficult to meet the needs of power grid operation and social development. Summary of the Invention

[0004] In order to solve the above problems, the present disclosure proposes a distribution network transfer auxiliary decision-making system and method based on the optimal algorithm. After the key nodes of the distribution network lose power, it can intelligently generate auxiliary decisions for fault handling, achieve rapid response to power grid faults, and thus improve the modernization level of the distribution network and the reliability of power supply services.

[0005] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0006] One or more embodiments provide a distribution network power transfer auxiliary decision system based on an optimal algorithm, including a power supply capacity analysis system, a substation power failure transfer and series power supply decision system;

[0007] Power supply capacity analysis system: This system is configured to analyze the power supply capacity of the power-lost substation and its affiliated lines based on the feeder ring network topology, and obtain the number of ring network points and line connection relationship;

[0008] Substation power failure transfer and parallel supply decision-making system: It is configured to use the iterative solution of the optimal algorithm to make logical judgments on substation power failure transfer or parallel supply based on the line connection relationship, and realize the intelligent generation of transfer or parallel supply plans after failure of key nodes in the distribution network.

[0009] One or more embodiments provide a distribution network power transfer auxiliary decision-making method based on an optimal algorithm, comprising the following steps:

[0010] Based on the feeder ring network topology, the power supply capacity of the power-off substation and its affiliated lines are analyzed to obtain the number of ring network points and the line connection relationship;

[0011] By using the iterative solution of the optimal algorithm, logical judgment is made on whether to transfer or connect power in the event of a substation power failure based on the line connection relationship, and intelligent transfer or connection plans are generated after failures at key nodes in the distribution network.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Based on the feeder ring network topology, the present invention analyzes the number of ring network points and the line connection relationship, and can intelligently generate a power transfer plan based on the selected power-lost line and the reference daily equipment load. By using the optimal grid operation algorithm, it can realize intelligent decision-making on the grid operation mode considering the multi-section load control requirements when several substations in the grid section lose power, and achieve one-click generation of distribution network load control plans.

[0014] The advantages of the present disclosure and additional advantages will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute a part of the present disclosure, are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure but do not constitute a limitation of the present disclosure.

[0016] Figure 1 This is a system block diagram of embodiment 1 of the present disclosure

[0017] Figure 2 This is a diagram of a system plan generation interface of Example 1 of the present disclosure;

[0018] Figure 3 is a flow chart of the method of embodiment 2 of the present disclosure; DETAILED DESCRIPTION

[0019] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs.

[0021] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. It should be noted that, in the absence of conflict, the various embodiments in the present disclosure and the features in the embodiments can be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.

[0022] Example 1

[0023] In the technical solutions disclosed in one or more embodiments, Figure 1 As shown in the figure, the distribution network transfer auxiliary decision system based on the optimal algorithm includes a power supply capacity analysis system, a substation power failure transfer and series power supply decision system;

[0024] Power supply capacity analysis system: This system is configured to analyze the power supply capacity of the power-lost substation and its affiliated lines based on the feeder ring network topology, and obtain the number of ring network points and line connection relationship;

[0025] Substation power failure transfer and parallel supply decision-making system: It is configured to use the iterative solution of the optimal algorithm to make logical judgments on substation power failure transfer or parallel supply based on the line connection relationship, and realize the intelligent generation of transfer or parallel supply plans after failure of key nodes in the distribution network.

[0026] This embodiment is based on the feeder ring network topology relationship, and analyzes the number of ring network points and the line connection relationship. It can intelligently generate a power transfer plan based on the selected power outage line and the reference daily equipment load. By using the optimal grid operation algorithm, it can realize intelligent decision-making on the grid operation mode considering the multi-section load control requirements when several substations in the grid section lose power, and achieve one-click generation of distribution network load control plans.

[0027] In some embodiments, the power supply capability analysis system mainly includes a data acquisition layer, a data processing layer and a system display layer.

[0028] Data acquisition layer: It is configured to establish data interfaces with OMS, PES, MIS, etc. to obtain data from various power grid operation systems;

[0029] Data processing layer: It is configured to integrate the data obtained from the operating system, apply data mining technology to perform data classification and modular processing and analysis, and obtain the power supply capacity of the distribution network;

[0030] Optionally, the power supply capacity of the distribution network includes information such as line operation status and grid connection point status, and the grid connection point status includes the number of ring network points and the line connection relationship;

[0031] System display layer: configured to provide modular display of the power supply capability of the distribution network.

[0032] Optionally, the data processing layer includes a data cleaning module, a loading module and a data processing module.

[0033] The data cleaning module is configured to use methods such as data type conversion, data comparison, and data association relationship search to complete the cleaning of incomplete, erroneous, and duplicate data, and to achieve accurate extraction of correct data.

[0034] The loading module can be configured to utilize high-performance parallel loading and DBLOAD standard data loading functions to quickly load massive power grid operation data and improve system operation efficiency.

[0035] The data processing module can be configured to establish a mapping relationship for the data, unify and aggregate it according to the coding rules, data units, and data types, and perform logical calculations based on business requirements and rule support to obtain the line operation status and grid connection point status;

[0036] Specifically, the substations, busbars, lines, switches, circuit breakers and other similar data of different business systems are mapped to association tables through association relationships such as names and codes. Then, they are unified and aggregated according to coding rules, units, and data types. Furthermore, the calculation of complex business logic is supported according to business requirements and rules. The main contents of the grid connection point situation obtained may include:

[0037] (1) Number of 10kV lines: the number of all 10kV lines supplied by regional substations or main transformers.

[0038] (2) Number of interconnected 10kV lines: 10kV lines supplied by regional substations or main transformers that are interconnected with 10kV lines outside the region.

[0039] (3) Number of 10kV lines that cannot be connected: 10kV lines supplied by regional substations or main transformers that are not connected to 10kV lines outside the region.

[0040] (4) Number of 10kV lines that can be transferred from a substation: The 10kV lines supplied by the regional substation or main transformer are connected to the 10kV lines outside the region and the lines will not cause overload after the power transfer.

[0041] (5) Number of 10kV lines that cannot be transferred at the substation: the number of 10kV lines at the substation minus the number of 10kV lines that can be transferred at the substation.

[0042] Furthermore, it also includes a system database configured to store distribution network topology, distribution network transmission line related parameters, substation primary equipment parameters and grid operation data.

[0043] The distribution network topology, transmission line parameters (capacity, conductor type, etc.), and substation primary equipment parameters (transformers, busbars, switches, etc.) can be input in advance, and grid operation data can be acquired in real time. This data can include the power generation output and load of each node.

[0044] Under the premise of ensuring the grid topology remains unchanged and operates normally, by setting the status of the interconnecting switches and section switches in the grid to "on" or "off", the power supply path can be quickly reconstructed and optimized when a fault occurs at a certain point in the grid.

[0045] The power supply capacity analysis system analyzes the power supply capacity of the corresponding substation and its associated 10kV lines, and makes logical judgments about the power transfer system in the event of a substation power outage based on the interconnection relationships of the 10kV lines. Leveraging the optimal distribution network operation algorithm, it automatically generates a one-click distribution network transfer plan in the event of a substation power outage.

[0046] Alternatively, the power supply capacity analysis system: If there is no connection between the 10kV lines, it is configured to analyze the power supply capacity of the corresponding substation and the affiliated 10kV lines, perform logical judgment on the generation of the substation power failure string supply system, and use the optimal algorithm for distribution network operation to achieve one-click automatic generation of the distribution network string power supply plan in the event of a substation power failure.

[0047] Based on the feeder ring network topology, the number of ring network points and the line connection relationship are analyzed. A device is selected as the power-off device in the system, and then a reference day is selected. The annual maximum current, monthly maximum current, daily maximum current, or the current at any time point can be selected as the reference daily current. Based on the above relationship, a plan is generated to assist decision-making in the event of a fault.

[0048] Before determining the logic for power transfer and parallel power supply in the event of a power outage at a substation, it is necessary to determine the topological path that can transfer or parallel power supply, including the following steps:

[0049] 11. Starting from the power source point that constitutes the power grid, select the line equipment in turn and exclude the faulty equipment; the line equipment includes transmission and distribution lines, busbars, main transformers and switches, etc.

[0050] 12. Connect the devices with the same endpoint number among the selected devices, and perform topology analysis on the power grid according to the active power direction until the opposite ring network line with communication is obtained, and obtain and save the topological channel path except for the faulty device.

[0051] The method for logical judgment of power transfer in substation power failure is as follows:

[0052] 21. If the substation loses pressure, find all the busbars under the substation through the topological connection relationship.

[0053] 22. Find all the lines under the 10kV busbar, and perform a power transfer analysis based on the reference day load conditions and the line connection relationship. Analyze the topological path obtained by iterative solution based on the optimal algorithm. If the topological path has a connection relationship with the power-off transformer and the load on the opposite line does not exceed the load after the transfer, then the plan will be saved. If the load on the opposite line exceeds the load after the transfer, the transfer cannot be made.

[0054] The iterative solution steps of the optimal algorithm are as follows: find all lines connected to the fault line through the topological path, iterate all lines, find all connected lines whose sum of the lines on both sides does not exceed the current carrying capacity of the lines on both sides calculated on the reference day, and find the line with the largest margin on the opposite side among all connected lines, that is, the line with the largest value obtained by subtracting the sum of the currents on both sides from the current carrying capacity, and set it as the optimal transfer line.

[0055] 23. All possible power transfer plans are summarized and stored as substation pressure loss power transfer plans.

[0056] The method for logical judgment of power failure and cross-supply in substation is as follows:

[0057] 31. When the substation loses pressure, find all the busbars under the substation through the topological connection relationship.

[0058] 32. Find all lines under the 10kV busbar and analyze the power transfer based on the reference daily load and line connection relationships. Analyze the topological path obtained through iterative optimization. If the topological path is connected to the failed transformer and the load after power transfer does not exceed the load of the opposite line, save the plan as the power transfer plan. If the load after power transfer exceeds the load of the opposite line, the power transfer is not allowed. The analysis method based on the topological path obtained through iterative optimization is the same as above.

[0059] 33. Find all lines that cannot be transferred or have no connection, find lines that can be connected through the same bus, and the found lines have external connections, and perform load analysis. If the load does not exceed the line on this side and the line on the opposite side, the busbar series supply can be used to restore power supply through this line.

[0060] 34. Combining all the power transfer plans and the series power supply plans together will give us the substation voltage loss series power supply plan.

[0061] Furthermore, it also includes a method for determining a busbar voltage loss transfer plan. Based on SCADA, PMS line ledger data, marketing system user data, and distribution GIS ring network ledger information, the 10kV lines to which the 10kV bus belongs are analyzed, and a busbar voltage loss transfer plan is generated based on the connection relationship of the 10kV lines. Specifically, it includes:

[0062] 41. According to the topological connection relationship of the power grid, find all 10kV lines under the 10kV bus;

[0063] 42. Find the interconnecting lines of the 10kV lines respectively, and find the interconnecting lines with the largest margin according to the maximum current of the reference day. Determine whether the current of the power-off line plus the current of the opposite line exceeds the current-carrying capacity of the opposite line. If it does not exceed, save the topology of the opposite line. If it exceeds, select another line. If there is no transfer line, the line cannot be transferred; generate a distribution network series supply plan based on the 10kV lines without a connection relationship.

[0064] 43. Combining all the power transfer plans and series power supply plans will give us the busbar pressure loss power transfer plan.

[0065] In step 42, a distribution network cross-connection plan is automatically generated for the 10kV lines that have no connection relationship, and an automatic analysis is performed on whether the cross-connection will cause overload of the 10kV line on the opposite side and the main network equipment after the power transfer, including:

[0066] 421. Based on the connection relationship of the local line, find the busbar that belongs to this line. Based on this busbar, find a line A that has a connection with the outside of the station and has the largest current margin.

[0067] 422. Determine whether the opposite line can be connected to the power supply according to the rules. If the current carrying capacity of the opposite line is less than the current of the opposite line plus the current of the local line, remove the opposite line and reselect.

[0068] 423. Find the lines that can be connected for power supply and generate a line-to-power supply plan.

[0069] In this embodiment, the circuit that needs to be transferred or connected to the power-off line is called the local circuit, and the circuit that transfers or connects power to the local circuit is called the opposite circuit.

[0070] like Figure 2 As shown in FIG, the system operation effect diagram of this embodiment can generate power failure transfer or series power supply plans of transformers in batches in the shortest time, which greatly improves the stability of power supply.

[0071] Example 2

[0072] Based on Example 1, this embodiment provides a distribution network transfer auxiliary decision method based on an optimal algorithm, such as Figure 3 As shown, the following steps are included:

[0073] Based on the feeder ring network topology, the power supply capacity of the power-off substation and its affiliated lines are analyzed to obtain the number of ring network points and the line connection relationship;

[0074] By using the iterative solution of the optimal algorithm, logical judgment is made on whether to transfer or connect power in the event of a substation power failure based on the line connection relationship, and intelligent transfer or connection plans are generated after failures at key nodes in the distribution network.

[0075] Optionally, an optimal algorithm iterative solution method is used, including the following steps:

[0076] Starting from the power source point that constitutes the power grid, select the line equipment in sequence and exclude the faulty equipment;

[0077] Connect the devices with the same endpoint number among the selected devices, and perform topology analysis on the power grid according to the active power direction until a connected opposite-side ring network line is obtained, and obtain and save the topological channel path excluding the faulty device.

[0078] Optional method for determining logic for power transfer in case of power failure in a substation is as follows:

[0079] When the substation loses voltage, all busbars under the substation can be found through topological connection relationships.

[0080] Find all lines under the 10kV busbar and analyze the power transfer based on the reference day load and line connection relationship. Analyze the topological path obtained by iteratively solving the optimal algorithm. If the topological path has a connection relationship with the power-off transformer and the load after power transfer does not exceed the load of the opposite line, then save the solution. If the load after power transfer exceeds the load of the opposite line, then the power transfer cannot be carried out.

[0081] All possible power transfer plans are summarized and stored as substation voltage loss power transfer plans.

[0082] Optional method for determining the logic of power failure and power supply in substation is as follows:

[0083] If the substation loses voltage, all busbars under the substation can be found through topological connection relationships;

[0084] Find all lines under the 10kV busbar and perform a power transfer analysis based on the reference day load and line connection relationship. Analyze the topological path obtained by iteratively solving the optimal algorithm. If the topological path is connected to the power-off transformer and the load after power transfer does not exceed the load of the opposite line, save the plan as the power transfer plan. If the load after power transfer exceeds the load of the opposite line, the power transfer cannot be performed.

[0085] Find all lines that cannot be transferred or have no connection, find lines that can be connected through the same bus, and if the found lines have external connections, perform load analysis. If the load does not exceed the line on this side and the line on the opposite side, busbar series supply can be used to restore power supply through this line;

[0086] All the power transfer plans and series power supply plans are summarized to form the substation pressure loss series power supply plan.

[0087] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

[0088] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Those skilled in the art should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A distribution network transfer auxiliary decision system based on an optimal algorithm, characterized by: Including power supply capacity analysis system, substation power failure transfer and cross-supply decision-making system; Power supply capacity analysis system: This system is configured to analyze the power supply capacity of the power-lost substation and its affiliated lines based on the feeder ring network topology, and obtain the number of ring network points and line connection relationship; The power supply capacity analysis system includes a data acquisition layer, a data processing layer and a system display layer; Data processing layer: The acquired operating system data is integrated, and data mining technology is applied to perform data classification and modular processing and analysis to determine the power supply capacity of the distribution network; The data processing layer includes a data cleaning module, a loading module and a data processing module; Substation power outage transfer and parallel power supply decision-making system: This system is configured to use the iterative solution of the optimal algorithm to make logical judgments on power transfer or parallel power supply in substation power outages based on line connection relationships, and to intelligently generate transfer or parallel power supply plans after failures at key distribution network nodes; Before determining the logic for power transfer or parallel power supply in the event of a power outage in a substation, determine the topological path for power transfer or parallel power supply, including the following steps: Starting from the power source point of the power grid, select the line equipment in sequence and exclude the faulty equipment; the line equipment includes transmission and distribution lines, busbars, main transformers and switches; Connect the devices with the same endpoint number among the selected devices, and perform topology analysis on the power grid according to the active power direction until a connected opposite-side ring network line is obtained. Obtain and save the topology path excluding the faulty device. The optimal algorithm iterative solution method includes the following steps: All lines connected to the faulty line are found through the topological path. All lines are iterated to find all the connecting lines whose sum of the lines on both sides does not exceed the current carrying capacity of the lines on both sides calculated on the reference day. The line with the largest margin on the opposite side among all the connecting lines is found as the optimal transfer line.

2. The distribution network transfer auxiliary decision system based on the optimal algorithm according to claim 1, characterized in that: The power supply capacity analysis system mainly includes data acquisition layer, data processing layer and system display layer; Data acquisition layer: configured to obtain data from various power grid operation systems; System display layer: configured to provide modular display of the power supply capability of the distribution network.

3. The distribution network transfer auxiliary decision system based on the optimal algorithm according to claim 2, characterized in that: The data processing layer includes data cleaning module, loading module and data processing module; The data cleaning module is configured to: clean incomplete, erroneous and duplicate data by using data type conversion, data comparison and / or data association methods; A loading module configured to achieve rapid loading of power grid operation data using parallel loading and standard data loading functions; The data processing module is configured to establish a mapping relationship for the data, unify and aggregate it according to the coding rules, data units, and data types, perform logical calculations based on business requirements and rule support, and obtain the line operation status and grid connection point status.

4. The distribution network transfer auxiliary decision system based on the optimal algorithm according to claim 1, characterized in that: It also includes a system database configured to store distribution network topology, distribution network transmission line related parameters, substation primary equipment parameters and grid operation data.

5. The distribution network transfer auxiliary decision system based on the optimal algorithm according to claim 1, characterized in that: The method for logical judgment of power transfer in substation power failure is as follows: If the substation loses voltage, all busbars under the substation can be found through topological connection relationships; Find all lines under the 10kV busbar and analyze the power transfer based on the reference day load and line connection relationship. Analyze the topological path obtained by iteratively solving the optimal algorithm. If the topological path has a connection relationship with the power-off transformer and the load after power transfer does not exceed the load of the opposite line, then save the solution. If the load after power transfer exceeds the load of the opposite line, then the power transfer cannot be carried out. All possible power transfer plans are summarized and stored as substation voltage loss power transfer plans.

6. The distribution network transfer auxiliary decision system based on the optimal algorithm according to claim 1, characterized in that: The method for logical judgment of power failure and cross-supply in substation is as follows: If the substation loses voltage, all busbars under the substation can be found through topological connection relationships; Find all lines under the 10kV busbar and perform a power transfer analysis based on the reference day load and line connection relationship. Analyze the topological path obtained by iteratively solving the optimal algorithm. If the topological path is connected to the power-off transformer and the load after power transfer does not exceed the load of the opposite line, save the plan as the power transfer plan. If the load after power transfer exceeds the load of the opposite line, the power transfer cannot be performed. Find all lines that cannot be transferred or have no connection, find lines that can be connected through the same bus, and if the found lines have external connections, perform load analysis. If the load does not exceed the line on this side and the line on the opposite side, busbar series supply can be used to restore power supply through this line; All the power transfer plans and series power supply plans are summarized to form the substation pressure loss series power supply plan.

7. A distribution network transfer auxiliary decision-making method based on an optimal algorithm, characterized in that: The steps include: Based on the feeder ring network topology, the power supply capacity of the power-off substation and its affiliated lines are analyzed to obtain the number of ring network points and the line connection relationship; The power supply capacity analysis system includes data acquisition layer, data processing layer and system display layer; Data processing layer: The acquired operating system data is integrated, and data mining technology is applied to perform data classification and modular processing and analysis to determine the power supply capacity of the distribution network; The data processing layer includes a data cleaning module, a loading module and a data processing module; By using the iterative solution of the optimal algorithm, logical judgment is made on whether to transfer or connect power when the substation loses power based on the line connection relationship, and intelligently generate transfer or connection plans after failure of key nodes in the distribution network; Before determining the logic for power transfer or parallel power supply in the event of a power outage in a substation, determine the topological path for power transfer or parallel power supply, including the following steps: Starting from the power source point of the power grid, select the line equipment in sequence and exclude the faulty equipment; the line equipment includes transmission and distribution lines, busbars, main transformers and switches; Connect the devices with the same endpoint number among the selected devices, and perform topology analysis on the power grid according to the active power direction until a connected opposite-side ring network line is obtained. Obtain and save the topology path excluding the faulty device. The optimal algorithm iterative solution method includes the following steps: All lines connected to the faulty line are found through the topological path. All lines are iterated to find all the connecting lines whose sum of the lines on both sides does not exceed the current carrying capacity of the lines on both sides calculated on the reference day. The line with the largest margin on the opposite side among all the connecting lines is found as the optimal transfer line.

8. The distribution network transfer auxiliary decision-making method based on the optimal algorithm according to claim 7 is characterized in that: The method for logical judgment of power transfer in substation power failure is as follows: If the substation loses voltage, all busbars under the substation can be found through topological connection relationships; Find all lines under the 10kV busbar and analyze the power transfer based on the reference day load and line connection relationship. Analyze the topological path obtained by iteratively solving the optimal algorithm. If the topological path has a connection relationship with the power-off transformer and the load after power transfer does not exceed the load of the opposite line, then save the solution. If the load after power transfer exceeds the load of the opposite line, then the power transfer cannot be carried out. Summarize all possible power transfer plans and store them as substation power transfer plans under voltage loss; Alternatively, the method for determining the logic of power failure and power supply in a substation is as follows: If the substation loses voltage, all busbars under the substation can be found through topological connection relationships; Find all lines under the 10kV busbar and perform a power transfer analysis based on the reference day load and line connection relationship. Analyze the topological path obtained by iteratively solving the optimal algorithm. If the topological path is connected to the power-off transformer and the load after power transfer does not exceed the load of the opposite line, save the plan as the power transfer plan. If the load after power transfer exceeds the load of the opposite line, the power transfer cannot be performed. Find all lines that cannot be transferred or have no connection, find lines that can be connected through the same bus, and if the found lines have external connections, perform load analysis. If the load does not exceed the line on this side and the line on the opposite side, busbar series supply can be used to restore power supply through this line; All the power transfer plans and series power supply plans are summarized to form the substation pressure loss series power supply plan.

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