Power grid security risk assessment based on the comprehensive element influence index

Security risk assessment is of great significance to improve the security operation capability and prevent blackouts of a power system. To overcome the shortcomings of existing security risk assessment methods for component differences, a security risk assessment method based on component comprehensive influence is proposed. Considering flow transferring, the complex network theory and entropy theory are applied to setting up the comprehensive influence index of components Taking into account the correlation between indicators, the AHP-Cantille weighting method is used to obtain the overall comprehensive severity index. The simulation results of IEEE 30-bus system show that the proposed method can identify N-1 and N-k fault risk reasonably and effectively.