Risk Prediction Based Preventive Islanding Scheme for Power System Under Typhoon Involved With Rainstorm Events

Abstract

Frequent typhoon rainstorm events often trigger transmission lines outage, which are prone to cause cascading events and even worse blackouts. This paper proposed a risk prediction based preventive islanding scheme to ensure safe operation of power system under typhoon rainstorm events. First, the outage probability of lines is fairly assessed under typhoon rainstorm occurring simultaneously using the finite element method. Then, the risk prediction and grading are detailed to depict the emergency degree of risk induced by typhoon rainstorm and provide decision-making for the preventive islanding scheme. Next, a preventive control strategy based on islanding scheme is proposed. Specifically, the lines vulnerable to typhoon rainstorm are respectively separated into different islands by the proposed preventive islanding scheme to disperse the impacts of these vulnerable lines on power system, which can effectively alleviate cascading effects and reduce the risk of the system. Finally, a real power system in southeast part of China is used as the test system, and the real data of typhoon ever hit the system are used to verify the proposed preventive islanding scheme.