Emergency Disposal Optimization of Power Grid Cascading Failure Risk Under Multiple Wildfire Points

Wildfire disasters can cause transmission line failures characterized by low re-closing rate and high breaker rejecting rate, which dramatically increase the risk of cascading failures in power grids. Firstly, the characteristics of power grid cascading failures under multiple wildfire disasters are analyzed from the perspectives of multi fire high impedance faults, evolution pathways of power grid cascading reactions, and emergency disposal requirements for power grid cascading failures under multi-fire disasters. Secondly, establish quantitative decision-making indicators for emergency disposal on cascading failures risk, such as, the probability of transmission line cascading failures, the risk of power grid cascading failures, and the weight of transmission line cascading failures risk. Thirdly, an optimal decision-making method for emergency disposal of cascading failures risk was proposed, which considered the deployment of fire extinguishing equipment and the adjustment of power grid operation mode. Finally, the effectiveness of the proposed method is verified by a practical case of power grid.