Multi-factor decision-making of cascading outages in power system based on electric network dissection

Study of catastrophic accidents has shown that severe accidents in power grid have always been occurred by cascading failure. To figure out the possible cascading failure exactly is being more significant. Incorporating the impact of two properties in power grid in terms of the topological structure and the operating state, a multi-factor assessment indicators are now being proposed based on the subdivision of power grid including the two properties mentioned to figure out the sequence of cascading failures. Firstly, we choose the initial faults adopting the comprehensive index of branches. Then concentric relaxation theory is applied to build a system for quickly searching of fault set on which the fuzzy synthetic evaluation works to calculate the probability of next fault. The approaching proposed here can simplify the process of calculation effectively, and tends to be more reasonable as it is assessed by multiple factors which are uncertainty. The simulation analysis on the IEEE 30 bus test system has proved out the validity and rationality of this method.