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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: 2021-09-17
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Abstract
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  • Claims
  • 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

Method used

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  • Power grid fault modeling method and system based on subgraph isomorphism
  • Power grid fault modeling method and system based on subgraph isomorphism
  • 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 a prior art, so this application will not elaborate on it.

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

[0090] Secondly, classify and code according to the node types in the computing node set, and the type code of the nodes is determined by the function λ:V→C, where the code set is C, and 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 node v i The type code for c j .

[0091] S2: Obta...

Embodiment 2

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

[0125] An identification module, configured 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 features can be stored in the acquisition module in advance. When a fault model needs to be constructed, the required typical faults and corresponding features can be directly selected from it; a large number of typical faults and corresponding features can also be stored in the acquisition module. Typical faults and feature extraction algorithm, when it is necessary to build a fault model, select the required typical faults, and extract features according to the feature extra...

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Abstract

The invention discloses a power grid fault modeling method and system based on subgraph isomorphism. The method comprises the following steps of identifying a network topology of a power system; acquiring characteristics of typical faults, including a network mode, an action mode and a time sequence mode; searching all potential fault sub-graphs in the power system according to the network mode to form a potential fault sub-graph set; and distributing an action and a time sequence for each potential fault sub-graph in the potential fault sub-graph set according to the action mode and the time sequence mode. According to the power grid fault modeling method and system based on the subgraph isomorphism, automatic modeling of common faults can be achieved according to the topological structure of an existing power grid, a large amount of manual fault modeling and maintenance work caused by changes of the topological structure and the operation mode of the power grid is avoided, 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 method and system for modeling faults in a power grid 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 components of the power system, or short-circuit faults, etc.); power system stability refers to the ability of the power system to maintain stable operation after being disturbed by accidents. 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, the operation mode of the power grid shall be conducted by professionals in accordance with the unified requirements of the "Guidelines for the Safety and Stability of Power Systems", and it is nece...

Claims

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Application Information

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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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