Research On Transmission Line Fault Diagnosis Method Of Power System Based On RS-CPN

With the development of China's power industry,the scale and structure of power grid become more and more complex,and the demand of power consumers for the reliability of power transmission line is also increasing.Therefore,when the power transmission line fails,it requires the controller to quickly determine the fault area,remove the fault components so that to avoid spreading to a larger power supply area and affecting the reliability of user power consumption.Based on the thorough research of various artificial intelligent methods for power transmission line fault diagnosis,firstly the fault diagnosis model of Rough Sets-Petri Net(RS-PN)is established.The model takes protective and breaker signals as the set of conditional attributes for fault classification,and establish attribution decision tables with various possible failure scenarios.It uses RS to reduce the redundancy of the redundant data to obtain the optimal attribute decision table,and then uses the PN to diagnose the fault of the transmission line according to the reduced data.For PN,it is impossible to diagnose the complex faults of circuit breakers which have maloperation or refusal,a fault diagnosis method based on Rough Sets-Coloured Petri Net(RS-CPN)is proposed,The method uses the line analysis function of CPN and adopts the hierarchical fault diagnosis model,which can quickly judge the components of a simple fault or locate the fault area.When complex fault occurs,the traditional PN model of fault area within their respective independent components,combined with the relational database "components-protection circuit breaker",to find out the circuit breaker tripping and dynamic error,to identify the fault components then.Finally,given the complexity of power transmission lines,the resulting data are too large,so the sub region parallel reasoning is introduced into the fault diagnosis method of RS-CPN.It divides power transmission lines into a number of separate areas,and establishes independent fault diagnosis systems for these areas.Through the specific transmission line example,the simulation experiment is carried out to validate the proposed method.The experimental results show that the subject has simplified diagnosis model and improved the effectiveness of diagnosis.