Research of power system fault diagnosis method based on information identification

The main current research achievements for power system diagnoses are summarized, a fault diagnosis method based on information identification is proposed in this paper. Through the analysis of the power flow difference between normal operation and fault tripping, a fault equipment confirmed algorithm based on abnormal changes in the structure of power grid is developed, the evaluation of the action of the related relay protection and circuit breaker is realized by taking the confirmed fault equipment as the beginning of logic analysis. In order to identify the fault information sent out by SCADA system,accident information,abnormal information and status changing information are used in a identify fault information model. The model analyses these three parts information and identify their validity. The model combining with the fault diagnosis method received good results.