Cascade outage recognition and risk evaluation method of power grid

The invention relates to the technical field of safety protection of a power system, and in particular relates to a cascade outage recognition and risk evaluation method of a power grid. The cascade outage recognition and risk evaluation method comprises the following steps of: obtaining power grid historical fault information, determining a power gird anticipated accident list, determining a cascade fault propagation and evolution mechanism, determining possibility, ponderance and a risk measurement value of a power grid cascade fault, and establishing a cascade fault recognition and risk evaluation model. According to an actual physical propagation process and a mathematical property of the power grid cascade fault, credibility measurement and total load loss of accident occurrence possibility and ponderance are established by a credibility theory, and are solved by adopting a fuzzy simulation method and load flow calculation, and the contradiction between simulation precision and sampling frequency in the traditional method is solved. Simulation analysis on a WSCC 9 node testing system proves that the method has correctness and robustness, is little in dependence of a sample, and has important theoretical significance and practical significance in preventing large-area power failure accidents of a power grid.