Fault Diagnosis Based on Process Matching in Smart Distribution Grid

To the requirement of smart fault decision-making, by using the discrete event system structure, the problem analysis system of fault diagnosis in distribution grid is built, analyzing the basic principles, demonstrating the diagnosability and uncertainty in the problem of fault diagnosis, meanwhile putting forward the method of process matching based on the timing sequence and protection differential. The method comparing the number of unobservable event is adopted to solve the uncertainty of power system fault diagnosis, and exemplify the validity of the method.