Research On Petri Net Based Power Grid Fault Diagnosis Method

The interconnection scale of the modern power system is continuously ampliativeand fortified. Once the fault occurs, we must process it timely and accurately. Otherwise,it may be spread to largish areas and result in large-scale blackout. When the fault occurs,the automatic devices of the power system would produce a mass of alarm information,and bring much difficulty to the operators for fault diagnosis. So the fault diagnosis ofpower system is becoming a more important problem. A fault diagnosis method based onPetri nets improved model is presented and the fault diagnosis system composed of themodel and its illation rules is established in this thesis. This system has applied in thegrid of Siping city Jilin province. The results indicate that the system can work fast andaccurately. It can diagnosis the complicated faults such as multiple faults and faultscomposed of protection devices misoperation. The diagnosis results are reliable andeffective, and the system can be applied to the grid for on-line fault diagnosis.