Power system reliability evaluation considering cascading failures

Power system reliability evaluation is important for the power grid planning and operation. The conventional bulk system reliability evaluation algorithm reflects the reliability level in the aspects of loss of load probability,frequency and consequence. However,it only considers the independent failures without the cascading failures or common mode failures,which results in the reliability indices mismatch the actual experiences. In order to solve the problem,the concept of power system cascading failure was proposed and studied. But there is little research applying the model into the bulk system reliability evaluation and lack of the algorithm considering cascading failures. Based on cascading failure model and component failure rate model,this paper proposed the simulation method for cascading failures of components and applied it in the reliability evaluation of power system as well as the indices. At last,IEEE-RTS79 system and Guangxi power grid was given to make a reliability analysis,and the results proved the effectiveness of the proposed method.