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A power grid fault modeling method and system based on subgraph isomorphism

A technology of power grid fault and modeling method, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of changing daily operation mode of the power grid, increased risk of cascading failures, etc., and achieve the effect of improving the level of automation

Active Publication Date: 2022-07-01
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Application Information

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Problems solved by technology

[0004] With the continuous expansion of the grid scale, the increasingly complex system topology, the changeable daily operation mode of the grid, and the increased risk of cascading failures, the traditional manual fault modeling and fault maintenance methods can no longer meet the needs of security and stability analysis and calculation, and there is an urgent need to provide automated Means to realize automatic modeling of various faults in the power system, improve the automation level of power system stability analysis, and ensure the safe and stable operation of the power grid

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  • A power grid fault modeling method and system based on subgraph isomorphism
  • A power grid fault modeling method and system based on subgraph isomorphism
  • A power grid fault modeling method and system based on subgraph isomorphism

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Embodiment 1

[0086] This embodiment provides a grid fault modeling method based on subgraph isomorphism, such as figure 1 shown, including the following steps:

[0087] S1: Identify the network topology of the power system;

[0088] First, the selected power system network is processed to obtain a simple undirected graph G, G=(V, E). How to process it is in the prior art, so this application will not describe it.

[0089] Among them, V={v 1 ,v 2 ,...,v n } represents the set of computing nodes of the power system, E represents the set of edges between computing nodes of the power system, and the weight of all edges is 1.

[0090] Secondly, classify and encode according to the node type in the computing node set, the type encoding of the node is determined by the function λ:V→C, where the encoding set is C, C={c 1 ,c 2 ,...,c l }∈R + , indicating that there are l types of computing nodes in the power system, λ(v i )=c j represents the node v i The type is encoded as c j .

[0091...

Embodiment 2

[0124] This embodiment provides a grid fault modeling system based on graph computing, including an identification module, an acquisition module, a search module, and an allocation module;

[0125] The identification module is used to identify the network topology of the power system;

[0126] The acquisition module is used to acquire the characteristics of typical faults, including network mode, action mode and timing mode;

[0127] In specific use, a large number of typical faults and corresponding characteristics can be stored in the acquisition module in advance. When a fault model needs to be built, the typical faults and corresponding characteristics needed can be directly selected from it; a large number of typical faults and corresponding characteristics can also be stored in the acquisition module. Typical faults and feature extraction algorithm, when a fault model needs to be constructed, select the required typical faults, and extract the features according to the f...

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Abstract

The invention discloses a power grid fault modeling method and system based on sub-graph isomorphism. The method includes the following steps: identifying the network topology of the power system; acquiring the characteristics of typical faults, including network mode, action mode and time sequence mode; Search all potential fault subgraphs in the power system according to the network mode to form a potential fault subgraph set; for each potential fault in the potential fault subgraph set according to the action mode and the time sequence mode Subgraphs assign actions and timings. The purpose of the present invention is to provide a power grid fault modeling method and system based on sub-graph isomorphism. According to the topology structure of the existing power grid, the automatic modeling of common faults can be realized, so as to avoid the problems caused by the change of the topology structure and operation mode of the power grid. A large number of faults are manually modeled and maintained by personnel, and the automation level of power system stability analysis is improved.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to a power grid fault modeling method and system based on subgraph isomorphism. Background technique [0002] Power system security refers to the ability of the power system to withstand fault disturbances during operation (such as sudden loss of power system components, or short-circuit faults, etc.); power system stability refers to the ability of the power system to maintain stable operation after accident disturbances. It is divided into static stability, transient stability, small disturbance dynamic stability, voltage stability and medium and long-term dynamic stability. [0003] In order to ensure the safe and stable operation of the power system, professionals shall conduct safety and stability analysis and calculation of various operating modes that may occur in the operation of the power grid according to the unified requirements of the "Guidelines for Safe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F30/20G06F16/901
CPCH02J3/001G06F30/20G06F16/9024H02J2203/20
Inventor 李鑫周波魏巍
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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