Voltage island-based power supply or grid-tie path critical device traceability method and system

Abstract

The application discloses a power supply or grid-connected path key equipment tracing method based on voltage islands, comprising a voltage island, voltage island construction and topology analysis, boundary transformer analysis and processing, and power supply path or grid-connected path key equipment search method. The application constructs the "voltage island" similar to the "electrical island" concept, completes voltage island mapping of various types of equipment through voltage island analysis of each topology node in the power system, and then realizes power supply path analysis of load, feeder and other equipment and grid-connected path tracing of generator, power collection line and other equipment according to the boundary characteristics between voltage islands. The method can greatly improve the search efficiency of key equipment on the power supply and grid-connected path.

Description

Technical Field

[0001] This invention relates to a method for tracing key equipment in power supply or grid connection paths based on voltage islands, belonging to the field of power system automation technology. Background Technology

[0002] With the continuous development of new energy technologies and the large-scale grid connection of distributed power sources, the observability, measurability, and controllability of distributed power sources are crucial for the stable operation of the power grid. Distributed power sources are characterized by their large number, scattered distribution, and weak communication infrastructure, making them unsuitable for the direct dispatch mode of traditional centralized power stations. Instead, a hierarchical and tiered group dispatch and control approach is needed, aggregating distributed power sources step by step to important equipment at each voltage level along the power supply path of the power grid, and carrying out distributed power source cluster control with the power supply equipment as the target.

[0003] In power systems, the search for power supply paths to power loads is of great significance for solving practical problems in power grid operation. For example, during equipment maintenance, commissioning of new power plants, and routine adjustments to operating modes, it is necessary to transfer power to critical loads to ensure uninterrupted power supply. This requires the search for power supply paths to find the optimal power source for these critical loads.

[0004] Traditional search methods start with the load or new energy generating unit and end with each level of transformer. They use depth-first or breadth-first topology search to obtain all power supply or grid connection paths. Then, by calculating the weight of each path, the shortest path is obtained, and finally, the transformers at each level of the shortest path are used as the search results. However, this algorithm has obvious drawbacks: First, performing a recursive search for each device using depth-first or breadth-first search is inefficient. Second, the search process traverses all power supply or grid connection paths, and the circuit breakers, disconnecting switches, and other disconnecting devices in the path are essentially meaningless for path analysis, resulting in a large amount of redundant and invalid calculations. Summary of the Invention

[0005] Purpose of the invention: This invention proposes a power supply or grid connection path tracing method based on voltage islands. By dividing the power grid into internally interconnected "voltage islands" distinguished by voltage levels and analyzing the boundary transformers between voltage islands, the method enables rapid location of key transformers in the load power supply path or the grid connection path of new energy units, thereby improving the search efficiency of key equipment.

[0006] In a first aspect, this disclosure provides a method for tracing critical equipment in a power supply or grid connection path based on a voltage island, comprising the following steps:

[0007] Step 1: Construct a voltage island group based on the attribute graph-based power grid topology model. The voltage island group includes multiple voltage islands and transformers. The voltage islands are constructed with a voltage island data structure containing four key information categories: voltage island number, voltage type, upstream voltage island-boundary, and downstream voltage island-boundary. The power grid topology model abstracts power grid equipment as a set of attribute points and attribute edges. By constructing an adjacency list, the attribute points are extended with voltage island numbers. A depth-first search is used to traverse the attribute graph corresponding to all network equipment. During the traversal, transformers and disconnected switching equipment are used as boundary equipment. Different voltage island numbers are assigned to different voltage islands. Equipment and equipment terminals within the same voltage island have the same voltage island number.

[0008] Step 2: The transformer is the boundary device connecting adjacent voltage islands. All transformers in the voltage island group are traversed and analyzed. Based on the high / medium / low voltage windings of the transformer, the upstream and downstream voltage islands of each voltage island are determined. The complete attribute information of the voltage island group is constructed based on the upstream and downstream voltage islands of each voltage island.

[0009] Step 3: Based on the voltage island information to which the load or new energy unit belongs and the complete attribute information of the voltage island group, determine the key transformer associated with the load or new energy unit.

[0010] Furthermore, the voltage island includes the following properties:

[0011] a. Voltage Island Number: Serves as a unique identifier for the voltage island;

[0012] b. Voltage type: The actual voltage type of the voltage island:

[0013] c. Upstream Voltage Island - Boundary: The set of upstream voltage islands of higher voltage levels connected to the current voltage island, and the boundary devices connecting the current voltage island and the upstream voltage islands.

[0014] d. Downstream Voltage Island - Boundary: The set of downstream voltage islands of lower voltage levels connected to the current voltage island, and the boundary device connecting the current voltage island and the downstream voltage islands.

[0015] Furthermore, the step of constructing a voltage island group based on the attribute graph-based power grid topology model includes: abstracting each power grid device in the attribute graph-based power grid topology model as a set of attribute points and attribute edges, with voltage islands as attribute points and transformers and disconnected switching devices as attribute edges, and configuring corresponding attribute information for each attribute point, including the voltage island number. Furthermore, the step of determining the upstream and downstream voltage islands of each voltage island based on the high / medium / low voltage windings of the transformer, and constructing complete attribute information for the voltage island group based on the upstream and downstream voltage islands of each voltage island includes:

[0016] a. For each transformer T, construct a voltage island H based on the current voltage island number of the high-voltage winding of transformer T. If the voltage island corresponding to the current voltage island number has already been constructed when processing other transformers, locate the corresponding voltage island and record the corresponding voltage island as voltage island H.

[0017] b. For each transformer T, construct a voltage island L based on the current voltage island number of the low-voltage winding of transformer T. If the voltage island corresponding to the current voltage island number has already been constructed when processing other transformers, locate the corresponding voltage island and record the corresponding voltage island as voltage island L.

[0018] c. Set the voltage level of voltage island H to the voltage level of the high-voltage side of transformer T, and set the voltage level of voltage island L to the voltage level of the low-voltage side of transformer T;

[0019] d. Add voltage island L to the downstream voltage island set of voltage island H, and include the boundary equipment in transformer T; add voltage island H to the upstream voltage island set of voltage island L, and include the boundary equipment in transformer T;

[0020] e. Obtain information about each voltage island and construct complete attribute information for the voltage island group based on the information about each voltage island.

[0021] Furthermore, step three specifically involves:

[0022] a. Obtain the current voltage island number to which the load or new energy unit belongs, and based on the current voltage island number, obtain the information set of the current voltage island corresponding to the current voltage island number from the complete attribute information of the voltage island group;

[0023] b. Obtain the set of upstream voltage islands from the information set of the current voltage island, and use the transformer between the current voltage island and the upstream voltage island as the first-level search for the corresponding critical path device;

[0024] c. For each upstream voltage island in the set of upstream voltage islands of the current voltage island, obtain its voltage island number, and then obtain the information of the upstream voltage island at the next higher level. Take the transformer between each upstream voltage island in the set of upstream voltage islands of the previous voltage island and the upstream voltage island at the next higher level of the set of upstream voltage islands of the current voltage island as the corresponding critical path device for the second layer of search.

[0025] d. Recursively complete the search of the upstream voltage island level by level to obtain the key transformer search corresponding to all levels, and regard the key transformers corresponding to all levels as key transformers associated with loads or new energy units.

[0026] Furthermore, the voltage island is a collection of electrical equipment and terminals connected together by a group of closed switching devices and non-switching devices of the same voltage level; the switching devices are electrical equipment with electrical isolation functions, including circuit breakers and disconnect switches; the non-switching devices are electrical equipment without electrical isolation functions, including AC lines, transformers, and series reactors; the collection of electrical equipment and terminals refers to the objectified electrical equipment after the power system completes the modeling of the power grid topology, as well as some endpoints of the electrical equipment when abstracted as single-terminal, double-terminal, and three-terminal devices.

[0027] Secondly, this disclosure provides a voltage island-based power supply or grid connection path key equipment tracing system, including a voltage island construction module, a voltage island attribute information analysis module, and a key equipment search module.

[0028] The voltage island construction module includes: constructing a voltage island group based on a power grid topology model using a property graph, wherein the voltage island group includes multiple voltage islands and transformers; the voltage island attribute information analysis module includes: transformers are boundary devices connecting adjacent voltage islands, traversing and analyzing all transformers in the voltage island group, determining the upstream and downstream voltage islands of each voltage island based on the high / medium / low voltage windings of the transformers, and constructing complete attribute information of the voltage island group based on the upstream and downstream voltage islands of each voltage island; the key equipment search module includes: determining the key transformers associated with the load or new energy unit based on the voltage island information to which the load or new energy unit belongs and the complete attribute information of the voltage island group.

[0029] Furthermore, the key equipment search module specifically comprises:

[0030] a. Obtain the current voltage island number to which the load or new energy unit belongs, and based on the current voltage island number, obtain the information set of the current voltage island corresponding to the current voltage island number from the complete attribute information of the voltage island group;

[0031] b. Obtain the information set of the upstream voltage island from the information set of the current voltage island, and use the transformer between the current voltage island and the upstream voltage island as the first-level search for the corresponding critical path device;

[0032] c. For each upstream voltage island in the set of upstream voltage islands of the current voltage island, obtain its voltage island number, and then obtain the information of the upstream voltage island at the next higher level. Take the transformer between each upstream voltage island in the set of upstream voltage islands of the previous voltage island and the upstream voltage island at the next higher level of the set of upstream voltage islands of the current voltage island as the corresponding critical path device for the second layer of search.

[0033] d. Recursively complete the search of the upstream voltage island level by level to obtain the key transformer search corresponding to all levels, and regard the key transformers corresponding to all levels as key transformers associated with loads or new energy units.

[0034] Thirdly, this disclosure provides a voltage island-based power supply or grid connection path critical equipment tracing device, characterized in that it includes a processor and a storage device, the storage device being used to store a voltage island-based power supply or grid connection path critical equipment tracing program, wherein when the voltage island-based power supply or grid connection path critical equipment tracing program is executed by the processor, the processor implements a voltage island-based power supply or grid connection path critical equipment tracing method.

[0035] Fourthly, this disclosure provides an electronic device including a memory and a processor, the memory being used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method described in the third aspect.

[0036] Fifthly, this disclosure provides a computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements a method for tracing critical equipment in a power supply or grid connection path based on a voltage island.

[0037] Beneficial effects: By dividing the power grid into interconnected "voltage islands" based on voltage levels and analyzing the boundary transformers between these voltage islands, the system can quickly locate key transformers in the load power supply path or the grid connection path of new energy units, thereby improving the efficiency of key equipment search. Attached Figure Description

[0038] Figure 1 This is a flowchart of a method for tracing critical equipment in a power supply or grid connection path based on a voltage island, according to an embodiment of this application.

[0039] Figure 2 This is a schematic diagram of a small power grid based on a voltage island-based method for tracing critical equipment in a power supply or grid connection path, according to an embodiment of this application.

[0040] Figure 3 This is a schematic diagram of a voltage island in a small power grid according to an embodiment of the present application of a method for tracing critical equipment in a power supply or grid connection path based on a voltage island. Detailed Implementation

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0042] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0043] Example 1:

[0044] like Figure 1 As shown, the method for tracing key equipment in the power supply or grid connection path based on voltage islands includes the following specific steps:

[0045] Step 1: Voltage Island Construction and Topology Analysis. Based on the power grid topology model built using attribute graph modeling, voltage islands are constructed. In attribute graph-based power grid topology modeling, power grid equipment is abstracted as a set of attribute points and attribute edges, and an adjacency list is constructed. The attribute points are extended with a "voltage island number" attribute. A depth-first search is used to traverse the attribute graph corresponding to all network equipment. During the traversal, different voltage islands are assigned different voltage island numbers. Equipment and equipment terminals within the same voltage island have the same voltage island number.

[0046] The voltage island is described as an independent group of electrical data, specifically including the following attributes:

[0047] a. Voltage Island Number, which is the value assigned in the depth-first search above, serves as a unique identifier for the voltage island.

[0048] b. Voltage type, the actual voltage type corresponding to the voltage island.

[0049] c. A set of high-voltage islands connected to the current voltage island, and boundary devices connecting the current voltage island to these upstream voltage islands.

[0050] d. The set of low-voltage islands connected to the current voltage island, and the boundary devices connecting the current voltage island to these downstream voltage islands.

[0051] Step two, analysis and processing of voltage island boundary transformers. The analysis and processing of boundary transformers describes the connection relationships between voltage islands, including: determining the upstream and downstream relationships of voltage islands based on the high / medium / low voltage windings of the transformers, assigning voltage types to the voltage islands, and recording the transformers as critical path devices in the voltage islands corresponding to the windings of each transformer; the search for critical devices in the power supply path or grid connection path includes tracing the path critical devices of a specified device based on the upstream and downstream voltage island information and boundary transformer information in the voltage island data. From the definition of a voltage island, it is easy to conclude that a voltage island can only be connected to its upstream or downstream voltage islands through transformers; that is, transformers are the boundary devices connecting voltage islands. Traversing and analyzing all transformers allows for the construction of complete voltage island attribute information.

[0052] a. Based on the voltage island number of the high-voltage side winding of transformer T, construct a voltage island, which is denoted as voltage island H for ease of description. If the voltage island corresponding to the current voltage island number has already been constructed when processing other transformers, locate the corresponding voltage island, which is also denoted as H.

[0053] b. Based on the voltage island number of the low-voltage side winding of transformer T, construct a voltage island, which is also denoted as voltage island L for ease of description. If the voltage island corresponding to the current voltage island number has already been constructed when processing other transformers, locate the corresponding voltage island, which is also denoted as L.

[0054] c. Set the voltage level of H to the voltage level of the high-voltage side of the transformer, and set the voltage level of L to the voltage level of the low-voltage side of the transformer.

[0055] d. Add voltage island L to the downstream voltage island set of voltage island H, and include boundary devices in T; add voltage island H to the upstream voltage island set of voltage island L, and include boundary devices in T.

[0056] After completing the above steps for all transformers, a complete set of voltage island information is obtained.

[0057] Appendix Figure 2 The diagram shows a small power grid comprising two 500kV substations, three 220kV substations, and six 110kV substations. T01-T11 represent the transformers within each substation. Voltage island analysis and transformer analysis are performed on them, as shown in the attached diagram. Figure 3 The diagram shows a voltage island group, which includes multiple voltage islands, such as two 500kV substations, three 220kV substations, and six 110kV substations.

[0058] The detailed attribute information for each voltage island is as follows:

[0059] {Island Number: 01; Voltage Level: 500kV; Upstream Voltage Island - Boundary: None; Downstream Voltage Island - Boundary: 02-T01, 03-T02}

[0060] {Island Number: 02; Voltage Level: 220kV; Upstream Voltage Island Boundary: 01-T01; Downstream Voltage Island Boundary: 04-T03}

[0061] {Island Number: 03; Voltage Level: 220kV; Upstream Voltage Island Boundary: 01-T01; Downstream Voltage Island Boundary: 05-T04, 06-T05}

[0062] {Island Number: 04; Voltage Level: 110kV; Upstream Voltage Island - Boundary: 02-T03; Downstream Voltage Island - Boundary: 07-T06, 08-T07, 09-T08}

[0063] {Island Number: 05; Voltage Level: 110kV; Upstream Voltage Island Boundary: 03-T04; Downstream Voltage Island Boundary: 10-T09, 11-T10}

[0064] {Island Number: 06; Voltage Level: 110kV; Upstream Voltage Island Boundary: 03-T05; Downstream Voltage Island Boundary: 12-T11}

[0065] {Island Number: 07; Voltage Level: 35kV; Upstream Voltage Island Boundary: 04-T06; Downstream Voltage Island Boundary: None}

[0066] {Island Number: 08; Voltage Level: 35kV; Upstream Voltage Island Boundary: 04-T07; Downstream Voltage Island Boundary: None}

[0067] {Island Number: 09; Voltage Level: 35kV; Upstream Voltage Island Boundary: 04-T08; Downstream Voltage Island Boundary: None}

[0068] {Island Number: 10; Voltage Level: 35kV; Upstream Voltage Island Boundary: 05-T09; Downstream Voltage Island Boundary: None}

[0069] {Island Number: 11; Voltage Level: 35kV; Upstream Voltage Island Boundary: 05-T10; Downstream Voltage Island Boundary: None}

[0070] {Island Number: 12; Voltage Level: 35kV; Upstream Voltage Island Boundary: 06-T11; Downstream Voltage Island Boundary: None}

[0071] Step 3: Based on voltage island information, search for key equipment along the power supply path or grid connection path. With complete voltage island information, the search for key transformer equipment along the power supply path or grid connection path can be completed. Detailed steps are as follows:

[0072] a. Obtain the voltage island number of the load or new energy unit, and then obtain the completion attribute information of the current voltage island.

[0073] b. Obtain the set of upstream voltage islands of the current voltage island. The boundary transformer between the current voltage island and the upstream voltage island is the critical path device obtained from the first layer search.

[0074] c. For each upstream voltage island, obtain its voltage island number, and then obtain the upstream voltage island information of the next higher level, thereby obtaining the second-level critical path device.

[0075] d. Recursively complete the search for upstream voltage islands and critical path equipment level by level, thereby realizing the search for critical transformers on the upward path of loads or new energy units at each voltage level.

[0076] Now suppose we need to perform a search for critical equipment in the power supply path of the load with voltage island number 08:

[0077] First, obtain the upstream voltage island of 08: 04, and include the boundary device T07 between 08 and 04 in the critical path;

[0078] Secondly, obtain the upstream voltage island of 04: 02, and include the boundary device T03 between 04 and 02 in the critical path;

[0079] Next, obtain the upstream voltage island of 02: 01, and include the boundary device T01 between 02 and 01 in the critical path;

[0080] Finally, the key equipment for the grid connection path of the load was obtained, which were transformers T07, T03, and T01 in sequence, thus completing the search.

[0081] Example 2:

[0082] A voltage island-based system for tracing key equipment in power supply or grid connection paths includes a voltage island construction module, a voltage island attribute information analysis module, and a key equipment search module.

[0083] The voltage island construction module includes: constructing a voltage island group based on a power grid topology model using a property graph, wherein the voltage island group includes multiple voltage islands and transformers; the voltage island attribute information analysis module includes: transformers are boundary devices connecting adjacent voltage islands, traversing and analyzing all transformers in the voltage island group, determining the upstream and downstream voltage islands of each voltage island based on the high / medium / low voltage windings of the transformers, and constructing complete attribute information of the voltage island group based on the upstream and downstream voltage islands of each voltage island; the key equipment search module includes: determining the key transformers associated with the load or new energy unit based on the voltage island information to which the load or new energy unit belongs and the complete attribute information of the voltage island group.

[0084] Furthermore, the key equipment search module specifically comprises:

[0085] a. Obtain the current voltage island number to which the load or new energy unit belongs, and based on the current voltage island number, obtain the information set of the current voltage island corresponding to the current voltage island number from the complete attribute information of the voltage island group;

[0086] b. Obtain the information set of the upstream voltage island from the information set of the current voltage island, and use the transformer between the current voltage island and the upstream voltage island as the first-level search for the corresponding critical path device;

[0087] c. For each upstream voltage island in the set of upstream voltage islands of the current voltage island, obtain its voltage island number, and then obtain the information of the upstream voltage island at the next higher level. Take the transformer between each upstream voltage island in the set of upstream voltage islands of the previous voltage island and the upstream voltage island at the next higher level of the set of upstream voltage islands of the current voltage island as the corresponding critical path device for the second layer of search.

[0088] d. Recursively complete the search of the upstream voltage island level by level to obtain the key transformer search corresponding to all levels, and regard the key transformers corresponding to all levels as key transformers associated with loads or new energy units.

[0089] Example 3:

[0090] A voltage island-based power supply or grid connection path critical equipment tracing device is characterized in that it includes a processor and a storage device. The storage device is used to store a voltage island-based power supply or grid connection path critical equipment tracing program. When the voltage island-based power supply or grid connection path critical equipment tracing program is executed by the processor, the processor implements a voltage island-based power supply or grid connection path critical equipment tracing method.

[0091] Example 4:

[0092] A computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements a method for tracing critical equipment in a power supply or grid connection path based on a voltage island.

[0093] In summary, this invention proposes a method for tracing key equipment in power supply or grid connection paths based on voltage islands. By dividing the power grid into interconnected "voltage islands" distinguished by voltage levels and analyzing the boundary transformers between voltage islands, the method can quickly locate key transformers in load power supply paths or new energy unit grid connection paths, thereby improving the efficiency of key equipment search.

[0094] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for tracing critical equipment in power supply or grid connection paths based on voltage islands, characterized in that, Includes the following steps, Step 1: Construct a voltage island group based on the attribute graph-based power grid topology model. The voltage island group includes multiple voltage islands and transformers. Step 2: The transformer is the boundary device connecting adjacent voltage islands. All transformers in the voltage island group are traversed and analyzed. Based on the high / medium / low voltage windings of the transformer, the upstream and downstream voltage islands of each voltage island are determined. The complete attribute information of the voltage island group is constructed based on the upstream and downstream voltage islands of each voltage island. Step 3: Based on the voltage island information to which the load or new energy unit belongs and the complete attribute information of the voltage island group, determine the key transformer associated with the load or new energy unit.

2. The method for tracing key equipment in power supply or grid connection paths based on voltage islands according to claim 1, characterized in that, Constructing a voltage island group based on a power grid topology model based on an attribute graph includes: abstracting each power grid device in the power grid topology model based on an attribute graph as a set of attribute points and attribute edges, with voltage islands as attribute points, transformers and disconnected switching devices as attribute edges, and configuring corresponding attribute information for each attribute point, including the voltage island number.

3. The method for tracing key equipment in power supply or grid connection paths based on voltage islands according to claim 1, characterized in that, Based on the high / medium / low voltage windings of the transformer, determine the upstream and downstream voltage islands of each voltage island, and construct the complete attribute information of the voltage island group based on the upstream and downstream voltage islands of each voltage island, including: a. For each transformer T, construct a voltage island H based on the current voltage island number of the high-voltage winding of transformer T; b. For each transformer T, construct a voltage island L based on the current voltage island number of the low-voltage winding of transformer T; c. Set the voltage level of voltage island H to the voltage level of the high-voltage side of transformer T, and set the voltage level of voltage island L to the voltage level of the low-voltage side of transformer T; d. Add voltage island L to the downstream voltage island set of voltage island H, and include the boundary equipment in transformer T; add voltage island H to the upstream voltage island set of voltage island L, and include the boundary equipment in transformer T; e. Obtain information about each voltage island and construct complete attribute information for the voltage island group based on the information about each voltage island.

4. The method for tracing key equipment in power supply or grid connection paths based on voltage islands according to claim 1, characterized in that, Step three specifically involves: a. Obtain the current voltage island number to which the load or new energy unit belongs, and based on the current voltage island number, obtain the information set of the current voltage island corresponding to the current voltage island number from the complete attribute information of the voltage island group; b. Obtain the information set of the upstream voltage island from the information set of the current voltage island, and use the transformer between the current voltage island and the upstream voltage island as the first-level search for the corresponding critical path device; c. For each upstream voltage island in the set of upstream voltage islands of the current voltage island, obtain its voltage island number, and then obtain the information of the upstream voltage island at the next higher level. Take the transformer between each upstream voltage island in the set of upstream voltage islands of the previous voltage island and the upstream voltage island at the next higher level of the set of upstream voltage islands of the current voltage island as the corresponding critical path device for the second layer of search. d. Recursively complete the search of the upstream voltage island level by level to obtain the key transformer search corresponding to all levels, and regard the key transformers corresponding to all levels as key transformers associated with loads or new energy units.

5. The method for tracing key equipment in power supply or grid connection paths based on voltage islands according to claim 1, characterized in that, The voltage island is a collection of electrical equipment and terminals connected together by a group of closed switching and non-switching devices of the same voltage level; the switching devices are electrical equipment with electrical isolation functions, including circuit breakers and disconnect switches; the non-switching devices are electrical equipment without electrical isolation functions, including AC lines, transformers, and series reactors; the collection of electrical equipment and terminals refers to the objectified electrical equipment after the power system completes the modeling of the power grid topology, as well as some endpoints of the electrical equipment when abstracted as single-terminal, double-terminal, and three-terminal devices.

6. A power supply or grid connection path key equipment tracing system based on voltage islands, characterized in that: It includes a voltage island construction module, a voltage island attribute information analysis module, and a key equipment search module; The voltage island construction module includes: constructing a voltage island group based on a power grid topology model based on a property graph, wherein the voltage island group includes multiple voltage islands and transformers; the voltage island attribute information analysis module includes: transformers are boundary devices connecting adjacent voltage islands, all transformers in the voltage island group are traversed and analyzed, and the upstream and downstream voltage islands of each voltage island are determined based on the high / medium / low voltage windings of the transformers, and the complete attribute information of the voltage island group is constructed based on the upstream and downstream voltage islands of each voltage island; the key equipment search module includes: determining the key transformers associated with the load or new energy unit based on the voltage island information to which the load or new energy unit belongs and the complete attribute information of the voltage island group.

7. The power supply or grid connection path key equipment tracing system based on voltage islands according to claim 6, characterized in that, The key equipment search module is specifically as follows: a. Obtain the current voltage island number to which the load or new energy unit belongs, and based on the current voltage island number, obtain the information set of the current voltage island corresponding to the current voltage island number from the complete attribute information of the voltage island group; b. Obtain the information set of the upstream voltage island from the information set of the current voltage island, and use the transformer between the current voltage island and the upstream voltage island as the first-level search for the corresponding critical path device; c. For each upstream voltage island in the set of upstream voltage islands of the current voltage island, obtain its voltage island number, and then obtain the information of the upstream voltage island at the next higher level. Take the transformer between each upstream voltage island in the set of upstream voltage islands of the previous voltage island and the upstream voltage island at the next higher level of the set of upstream voltage islands of the current voltage island as the corresponding critical path device for the second layer of search. d. Recursively complete the search of the upstream voltage island level by level to obtain the key transformer search corresponding to all levels, and regard the key transformers corresponding to all levels as key transformers associated with loads or new energy units.

8. A device for tracing critical equipment in a power supply or grid connection path based on a voltage island, characterized in that, The device includes a processor and a storage device for storing a voltage island-based power supply or grid connection path critical equipment tracing program, which, when executed by the processor, enables the processor to implement the method as claimed in claims 1-5.

9. A computer-readable medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in claims 1-5.

10. An electronic device, characterized in that, The method includes a memory and a processor, the memory being used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method of claims 1-5.

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