Research on fault element diagnosis in power system based on hierarchical model and switch temporal logic

When a fault occurs in the power system it is difficult to precisely diagnose the fault elements owning to the missing and false alarm information. Aiming at solving this problem, an expert system diagnosis method based on knowledge network technology is proposed in this paper. In the process of establishing the expert system, this paper puts forward a hierarchical scheduling information classification model, and designs a knowledge network which can be used to calculate the possibility of every knowledge node in the knowledge network by using switching action sequence and protection action logic. According to the result, the faults which have happened can be judged. At last,it takes Shanghai power grid as an example to verify this method.