Cascading Failure Model of Integrated Electricity-Gas System Considering Multiple Driving Factors

Abstract

The propagation of cascading failures in an integrated electricity-gas system (IEGS) brings an inevitable threat to system safety. In this paper, we propose a novel model to describe the evolution process of cascading failures between electricity and gas grids that are affected by multiple driving factors. Hidden faults of relay protection, overloaded line outage, islanding decoupling and balancing, dispatch center faults, and other factors are considered in the simulation of cascading failures in power grids. Moreover, factors such as the removal of overloaded pipelines and the optimal dispatch are considered in the simulation of cascading failures in the gas network. Based on alternate iterations, a cascading failure model of IEGS is constructed from the perspective of time and space. The simulation results show that the proposed model can effectively describe the evolution process of cascading failures of coupling systems by multiple driving factors.