Correlation assessment method of power grid cascading failure accident chains

Abstract

A correlation assessment method of power grid cascading failure accident chains comprises the steps that (1) a system is initialized to be in a normal operation working condition; (2) initial failures happen to circuits with equal probability, circuit initial failures are circuit three-phase permanent short-circuit failures, relay protecting action failure removing in a set time is carried out, and for direct-current circuit, the initial failures are direct-current circuit single-pole locking failures; (3) based on the previous circuit failure situations, transient stability analysis is carried out on an electric system, if system transient is unstable, the step (7) is carried out; and if system transient is stable, the step (4) is carried out; and other steps are carried out. According to the method, on the basis that the correlation between cascading failures can be considered, system transient stability failures can be subjected to effective searching, searching correlation probability is given, system states and topology are considered, meanwhile, high computing efficiency is achieved, and certain guiding effect is achieved on cascading failure searching and accident chain recognition.

Description

technical field [0001] The invention relates to a power system risk assessment method applied in power system operation and safety monitoring systems, and belongs to the technical field of graph theory and computer technology applied to power system operation planning. Background technique [0002] In recent years, with the continuous expansion of the power grid scale and the increasing number of electrical components, the impact of blackouts on the power grid has become increasingly significant, and the complexity of failures has increased. Scholars at home and abroad have conducted research on the mechanism and model of blackouts Extensive and in-depth research. [0003] Worldwide, blackouts have occurred from time to time, such as the 2003 "US and Canada blackout", the blackout in Denmark and Sweden, the blackout in Italy, the blackout in South Africa and Western Europe in 2006, and the blackout in India in 2012. Take the "U.S. and Canada Blackout" that shocked the world...

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Problems solved by technology

[0004] Generally speaking, the analysis and research of cascading failures are mainly carried out from the two aspects of system state and topology, but there is little in-depth research on the correlation between cascading failures. From the analysis of the aforementioned cascading failure modes, although the first type focuses on the power system state The simulation model of variable quantity can effectively simulate the process of cascading failures, but if the lack of consideration of the correlation of cascading failures, the simulation results cannot accurately reflect the actual situation of the power grid, and the important cascading failure modes will be ignored

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