Power network accidents risk assessment based on topology structure

The “Regulation on the Emergency Response, Investigation and Handling of Electric Power Security Accidents”, based on load-shedding proportion, namely the Decree No.599 of the State Council of the People's Republic of China, was implemented on September 1st, 2011, which proposed new more stringent requests for power system reliability and security. Combining with related regulations on the Decree No.599, in this paper a new anticipated fault sets selection method which considers influences of electromagnetic loop networks for power grid reliability are proposed, the model of load-shedding allocating among fault substations is built, the algorithm of electricity security accidents risk grade assessment is designed. On the basis of that, taking an actual power grid as an example, simulation results can reflect electricity security accidents from perspective of probability and severity and shall distinguish weaknesses of the power grid effectively.