DC system multi-valve-group last circuit breaker identification method based on improved Tarjan algorithm

Abstract

The invention discloses a DC system multi-valve-group final circuit breaker identification method based on an improved Tarjan algorithm. The method comprises the following steps: firstly, abstractinga topological connection relationship between an incoming line and an outgoing line of an alternating-current field in a direct-current system and a valve group as well as a circuit breaker into an undirected connected graph, correcting an adjacent matrix of the undirected connected graph according to the state of each circuit breaker in the alternating-current field, and converting a final circuit breaker identification problem into a cut point problem between the valve group and an alternating-current line. The Tarjan algorithm can only obtain the cut point of the whole undirected connectedgraph. The Tarjan algorithm is improved, the method comprises the following steps: firstly, acquiring a cut point set on a path connecting any two vertexes in an undirected connected graph, recordinga passing vertex set of the path reaching the vertexes of each valve group, judging whether an intersection of the passing vertex set and the cut point set of the undirected connected graph contains acircuit breaker cut point or not, and obtaining a final circuit breaker set of each valve group. the final circuit breaker identification method is correct, effective, high in efficiency and stable,and the final circuit breaker of each valve group can be solved at a time.

Description

technical field [0001] The invention relates to the technical field, in particular to a method for identifying the final circuit breaker of a multi-valve group in a DC system based on an improved Tarjan algorithm. Background technique [0002] The deep coupling of AC and DC hybrid power grids makes the interaction between the DC system and the AC system more prominent. Finally, the circuit breaker is the key circuit breaker connecting the AC transmission line and the DC valve group in the DC transmission project. Once broken, the output current of the DC valve group will all flow into the reactive power compensation device, causing the AC and DC equipment in the converter station to exceed the withstand voltage margin. , endangering the safety of the equipment. Therefore, the identification of the final circuit breaker is of great significance to ensure the safe and stable operation of the power grid. [0003] In order to prevent the AC and DC equipment from overvoltage ca...

AI Technical Summary

Problems solved by technology

However, this method still has the following two problems: (1) When the DFS algorithm is used to traverse all the paths between the valve group and the AC line, the graph theory vertices are accessed too many times, and the algorithm efficiency is low

(2) Only the final circuit breaker between a single valve group and the AC line can be solved

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