Method and system for analyzing power failure range of equipment maintenance in transformer substation and storage medium

Abstract

The invention discloses a power failure range analysis method and system for equipment maintenance in a transformer substation and a storage medium, and the method comprises the steps: building an electrical connection relation model between equipment based on a topological structure of the equipment in the transformer substation; based on the electrical connection relation model, assigning starting equipment as a starting point of a topology search path, and constructing a topology search model; and determining the type of the maintenance equipment, if the type is a handcart switch, bringing the maintenance equipment into a power failure range and boundary equipment, and ending power failure range analysis, otherwise, based on the topology search model, starting topology analysis from the maintenance equipment, and determining the power failure range and the boundary equipment. Aiming at the current situation that equipment in a transformer substation is complex in structure, diversified in electrical connection and high in maintenance safety requirement, the power failure range can be accurately determined on the premise that maintenance safety and quality are guaranteed, the uncertain influence on power grid operation is reduced, and stable operation of a power grid is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power systems, in particular to a substation equipment maintenance power outage range analysis method and system and a storage medium. BACKGROUND

[0002] The stable operation of the equipment in the substation is the basis for ensuring the reliable power supply of the power system. Therefore, it is necessary to pay attention to the maintenance and management of the equipment in the substation, and to regularly inspect and maintain the equipment. When performing equipment maintenance, accurate analysis of the power outage range is crucial. Accurate power outage range analysis can minimize the impact on users, avoid unnecessary expansion of the power outage area, and also provide a clear work boundary for maintenance work, ensuring that maintenance personnel can work efficiently in a safe environment.

[0003] However, the existing substation management system has many problems in determining the equipment maintenance power outage range. On the one hand, the traditional power outage range determination method mainly relies on experience, which is prone to overestimation or underestimation of the power outage range, affecting the efficiency of maintenance and the normal operation of the power system. On the other hand, with the continuous expansion of the scale of the substation and the increase in the complexity of the equipment, how to quickly and accurately determine the power outage range has become a difficult problem. The existing monitoring system also has shortcomings in assisting power outage range analysis, and is difficult to provide comprehensive and accurate equipment status information, resulting in inaccurate determination of the power outage range.

[0004] For example, Chinese patent CN107203816B discloses a fault maintenance method and system for secondary equipment of a power system. The system can realize the acquisition and analysis of topology monitoring information, operation monitoring information and network communication information of secondary equipment, but only performs fault maintenance related operations on secondary equipment, which is not comprehensive enough.

[0005] For example, Chinese patent CN110851549A discloses a power outage range visualization method based on GIS and power grid topology. The method can realize intelligent user-level power outage range analysis and GIS-based visualization function, and solve the defects of inaccurate power outage impact range analysis and poor readability of power outage information notification. However, this method relies on data acquisition from the power dispatching operation management system, and during data transmission, it may also face risks such as network delay and data loss, which will affect the timeliness and reliability of the analysis results. SUMMARY

[0006] The purpose of the present application is to provide a substation equipment maintenance power outage range analysis method and system and a storage medium, which can improve the efficiency of maintenance, reduce the impact on the normal operation of the power system, and ensure the stable and reliable operation of the power system.

[0007] Technical solution: To achieve the above-mentioned purpose, the substation equipment maintenance power-off range analysis method provided by the application comprises the following steps:

[0008] S1, based on the topological structure of the equipment in the substation, an electrical connection relationship model between the equipment is established;

[0009] S2, based on the electrical connection relationship model, the starting equipment is specified as the starting point of the topological search path, and a topological search model is constructed;

[0010] S3, determine the type of the maintenance equipment A, if the type is a handcart switch, the maintenance equipment A is included in the power-off range and the boundary equipment, and the power-off range analysis is ended, otherwise based on the topological search model, topological analysis is carried out from the maintenance equipment A to determine the power-off range and the boundary equipment.

[0011] Preferably, the connection relationship model comprises the connection relationship between the connection line equipment and the upstream equipment, the relationship between the upstream equipment and the connection line equipment, the relationship between the connection line equipment and the downstream equipment, and the relationship between the downstream equipment and the connection line equipment.

[0012] Preferably, the electrical connection relationship model establishment method comprises: obtaining the account information of all equipment in the substation according to the substation number, classifying the equipment in the account information, finding all equipment of the connection line type, and constructing the electrical connection relationship model between the equipment.

[0013] Preferably, the account information acquisition method comprises: reading the drawing information of the substation from the database according to the substation number, and obtaining all sub-equipment information of the device from the root device of the drawing by recursive method.

[0014] Preferably, the topological search model construction method comprises: using the breadth-first search algorithm to gradually expand outward from the starting equipment, and exploring other equipment directly or indirectly connected with the starting equipment.

[0015] Preferably, the method for topological analysis based on the topological search model from the maintenance equipment A to determine the power-off range and the boundary equipment comprises:

[0016] S301, first topological path search: taking the maintenance equipment A as the starting point of the topological search, if the topological path stops at any one of the handcart switch or the terminal equipment, all equipment on the topological path is included in the power-off range, if the topological path stops at the disconnecting switch B, second topological path search is carried out;

[0017] S302, second topological path search: taking the disconnecting switch B as the starting point of the topological search, continuing the topological analysis along the untopological direction, if the topological path stops at any one of the busbar or the main transformer, the disconnecting switch B is included in the boundary equipment, and the power-off range analysis is ended;

[0018] If the topology stops at the outgoing point, if the maintenance device is not a circuit breaker, the power outage range analysis is ended; if the maintenance device is a circuit breaker, the isolating switch B is included in the boundary device, and the power outage range analysis is ended;

[0019] If the topology stops at any of the handcart switch or the terminal device, all devices on the path are included in the power outage range, and the handcart switch is included in the boundary device, and the power outage range analysis is ended;

[0020] If the topology stops at the isolating switch C and the circuit breaker D at the same time, all devices on the path are included in the power outage range, and the power outage range analysis is ended; if the topology does not stop at the isolating switch C and the circuit breaker D at the same time, a third topology path search is performed.

[0021] S303, the third topology path search: taking the circuit breaker D as the starting point of the topology search, continuing the topology analysis in the direction not yet topology, if the topology analysis stops at any of the busbar or the isolating switch or the terminal device, all devices on the path are included in the power outage range, and the isolating switch B is included in the boundary device.

[0022] Preferably, the terminal device is a device at the terminal of the topology path, and the boundary device is the last device of the topology path.

[0023] The substation device maintenance power outage range analysis system provided by the application comprises the following modules:

[0024] The electrical connection relationship module: based on the topology structure of the substation device, an electrical connection relationship model between devices is established;

[0025] The topology module: based on the electrical connection relationship model, a starting device is specified as the starting point of the topology search path, and a topology search model is constructed;

[0026] The topology analysis module: used to determine the type of the maintenance device A, if the type is a handcart switch, the maintenance device A is included in the power outage range and the boundary device, and the power outage range analysis is ended, otherwise, based on the topology search model, the topology analysis is performed from the maintenance device A, and the power outage range and the boundary device are determined.

[0027] The application also provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions that, when executed by a computing device, cause the computing device to perform any of the above-mentioned substation device maintenance power outage range analysis methods.

[0028] Beneficial effects: The present application has the following advantages: 1. Through in-depth analysis of the topological structure of the equipment in the substation and multiple rounds of topological path search, the power outage range can be determined more scientifically and accurately, avoiding the errors caused by traditional experience judgment and reducing the impact on the normal operation of the power system caused by inaccurate power outage range;

[0029] 2. With the expansion of the scale of the substation and the increase of the complexity of the equipment, the present application can quickly respond to changes and timely adjust the power outage range analysis strategy to ensure that efficient and accurate guidance can be provided for maintenance work under different conditions;

[0030] 3. The present application analyzes the power outage range under the premise of ensuring maintenance safety, includes the maintenance equipment and related equipment in the reasonable power outage range, and clearly defines the boundary equipment, effectively reducing the safety risk in the maintenance process;

[0031] 4. The present application can accurately determine the power outage range to reduce unnecessary power outage time and range, improve the efficiency of maintenance work, shorten the power outage time of the power system, and provide more stable and reliable power supply for users;

[0032] 5. It provides strong technical support for the construction and development of smart grid. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The flowchart of the present application;

[0034] Figure 2 The topological logic flowchart of the power outage range;

[0035] Figure 3 The specific implementation flowchart of the power outage range analysis. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be described in detail below in combination with the embodiments and the drawings.

[0037] As shown in the drawings, the substation equipment maintenance power outage range analysis method of the present application includes the following contents: Figure 1 S1, based on the topological structure of the equipment in the substation, an electrical connection relationship model between the equipment is established.

[0038] The connection relationship model includes the connection relationship between the connection line equipment and the upstream equipment, the relationship between the upstream equipment and the connection line equipment, the relationship between the connection line equipment and the downstream equipment, and the relationship between the downstream equipment and the connection line equipment. The process of establishing the electrical connection relationship model is as follows:

[0039]

[0040] ​1. Obtain the station account information of all devices in the substation according to the substation number, mainly establish a data cache mechanism for the station account information of primary devices; wherein the process of obtaining the station account information is: reading the drawing information of the substation from the database according to the substation number, starting from the root device of the drawing to obtain all the child device information under the device through recursive manner, and through the manner, all the device station account information in the station can be obtained.

[0041] 2. Classify the devices in the device station account information, and the device types include connection lines, primary devices, etc.

[0042] 3. Find all devices of the connection line type, analyze the electrical characteristics and connection logic of the connection lines, and construct an electrical connection relationship model between the devices.

[0043] S2. Based on the electrical connection relationship model, specify a starting device as the starting point of the topology search path, and construct a topology search model. Using the breadth-first search algorithm, starting from the starting device, gradually expand outward to explore other devices directly or indirectly connected to the starting device, thereby constructing the topology search model.

[0044] The breadth-first search algorithm is:

[0045] 1. Create a queue Q, and enqueue the starting device S, and mark S as visited;

[0046] 2. When the queue Q is not empty, execute the following steps:

[0047] 2.1, dequeue a device U from the queue Q;

[0048] 2.2, for each unvisited adjacent device V of device U, execute the following steps:

[0049] 2.2.1, mark device V as visited;

[0050] 2.2.2, enqueue device V to Q;

[0051] 2.2.3, if V is the target device T (i.e. the device where the topology stops), the search ends, otherwise repeat the above steps.

[0052] S3. Determine the type of the maintenance device A, if the type is a handcart switch, then the maintenance device A is included in the power-off range and the boundary device, and the power-off range analysis ends, otherwise based on the topology search model, start the topology analysis from the maintenance device A to determine the power-off range and the boundary device.

[0053] As shown in Figure 2 , the topology analysis process is:

[0054] First, perform a topology path search: take the equipment under maintenance A as the starting point of the topology search. If the topology stops at any device in the handcart switch or end device, then all devices on the topology path will be included in the power outage range. If the topology stops at the disconnect switch B, then perform a second topology path search.

[0055] Second topology path search: Using disconnector B as the starting point of the topology search, continue the topology analysis along the direction of the untopology. If the topology stops at any device in the bus or main transformer, all devices on the path are not included in the power outage range, but disconnector B is included in the boundary device, and the power outage range analysis ends.

[0056] If the topology stops at the outgoing point, and if the equipment under maintenance is not a circuit breaker, then all equipment on the path is not included in the power outage range, and the power outage range analysis ends; if the equipment under maintenance is a circuit breaker, then all equipment on the path is included in the power outage range, and disconnector B is included in the boundary equipment, and the power outage range analysis ends.

[0057] If any device in the topology leading to the handcart switch or the end device stops, then all devices on the path are included in the power outage range, the handcart switch is included in the boundary device, and the power outage range analysis ends.

[0058] If the topology simultaneously leads to both disconnector C and circuit breaker D, then all devices on the path are included in the outage area, and the outage area analysis ends; if the topology does not simultaneously lead to both disconnector C and circuit breaker D, then a third topology path search is performed.

[0059] The third topology path search: Using circuit breaker D as the starting point of the topology search, continue the topology analysis along the direction of the untopology. If the topology analysis stops at any of the following devices: busbar, disconnector, or terminal equipment, then all devices on the path are included in the power outage range, and disconnector B is included in the boundary equipment.

[0060] Among them, terminal equipment refers to equipment located at the end of the topology path, which has different behaviors in different paths. Typical terminal equipment includes grounding switches, surge arresters, etc.

[0061] Boundary devices are the last devices in the topology path and play a crucial role in defining the boundaries of the system. Although boundary devices require a power outage, they cannot be operated to ensure the overall safety of the system.

[0062] like Figure 3 As shown, this is an example of analyzing the power outage range for equipment maintenance within a power station. Before the analysis, the input data is first verified, including verifying whether the substation and maintenance equipment numbers meet the length limit, and verifying whether the substation number exists and whether the maintenance equipment is within the current substation, to ensure the correctness of the subsequent analysis.

Claims

1. A substation equipment maintenance power outage range analysis method, characterized by, The method comprises the following steps: S1, establishing an electrical connection relationship model between devices based on the topology structure of devices in the substation; S2, specifying a starting device as the starting point of the topology search path based on the electrical connection relationship model, and constructing a topology search model; S3, determining the type of the maintenance device A, if the type is a handcart switch, the maintenance device A is included in the power-off range and the boundary device, and the power-off range analysis is ended, otherwise, based on the topology search model, topology analysis is performed from the maintenance device A to determine the power-off range and the boundary device.

2. The method of claim 1, wherein, The connection relationship model includes the connection relationship between the connection line device and the upstream device, the relationship between the upstream device and the connection line device, the relationship between the connection line device and the downstream device, and the relationship between the downstream device and the connection line device.

3. The method of claim 1, wherein, The electrical connection relationship model establishment method is: obtaining the account information of all devices in the substation according to the substation number, classifying the devices in the account information, finding all devices of the connection line type, and constructing the electrical connection relationship model between the devices.

4. The method of claim 3, wherein, The account information acquisition method is: reading the drawing information of the substation from the database according to the substation number, and obtaining all sub-device information of the device from the root device of the drawing by recursive method.

5. The method of claim 1, wherein, The topology search model construction method is: using the breadth-first search algorithm to expand outward step by step from the starting device to explore other devices directly or indirectly connected with the starting device.

6. The method of claim 1, wherein, The method for determining the power-off range and the boundary device based on the topology search model from the maintenance device A is: S301, first topology path search: taking the maintenance device A as the starting point of the topology search, if the topology stops at any device of the handcart switch or the terminal device, all devices on the topology path are included in the power-off range, if the topology stops at the disconnecting switch B, the second topology path search is performed; S302, second topology path search: taking the disconnecting switch B as the starting point of the topology search, continuing topology analysis along the untopologized direction, if the topology analysis stops at any device of the busbar or the main transformer, the disconnecting switch B is included in the boundary device, and the power-off range analysis is ended; if the topology analysis stops at the outgoing point, if the maintenance device is not a circuit breaker, the power-off range analysis is ended; if the maintenance device is a circuit breaker, the disconnecting switch B is included in the boundary device, and the power-off range analysis is ended; if the topology analysis stops at any device of the handcart switch or the terminal device, all devices on the path are included in the power-off range, and the handcart switch is included in the boundary device, and the power-off range analysis is ended; if the topology analysis stops at the disconnecting switch C and the circuit breaker D at the same time, all devices on the path are included in the power-off range, and the power-off range analysis is ended; if the topology analysis does not stop at the disconnecting switch C and the circuit breaker D at the same time, the third topology path search is performed. S303, third topology path search: taking the circuit breaker D as the starting point of the topology search, continuing topology analysis along the untopologized direction, if the topology analysis stops at any device of the busbar or the disconnecting switch or the terminal device, all devices on the path are included in the power-off range, and the disconnecting switch B is included in the boundary device.

7. The method of claim 6, wherein, The terminal device is a device at the terminal of the topology path, and the boundary device is the last device of the topology path.

8. A substation equipment maintenance power outage range analysis system characterized by, The method comprises the following modules: A module for establishing an electrical connection relationship, which establishes an electrical connection relationship model between devices based on a topology structure of the substation; A module for constructing a topology, which specifies a starting device as a starting point of a topology search path based on the electrical connection relationship model, and constructs a topology search model; A topology analysis module, which is used to determine the type of the maintenance device A, and if the type is a handcart switch, the maintenance device A is included in the power-off range and the boundary device, and the power-off range analysis is ended, otherwise, based on the topology search model, the topology analysis is performed from the maintenance device A to determine the power-off range and the boundary device.

9. A computer-readable storage medium storing one or more programs, the one or more programs comprising instructions that when executed by a computer cause the computer to perform a method comprising: The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-7.

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