Fault diagnosis system for large power generation station and its transmission lines based on fuzzy relations

摘要

This paper proposes a fault diagnosis system based on the fuzzy relation theory to estimate the faulty item/section(s) of a large power generation station and its transmission lines. Therefore, it diagnoses the faulteditem/section(s) in terms of the degree of membership. Besides that, it also examines the mis-operation ofcorresponding circuit breakers. The proposed method utilizes the final information of protective relaysand corresponding circuit breakers to build the sagittal diagrams which represent the fuzzy relations for eachitem/section(s). In order to testify the validity and feasibility of that method, a computer simulation of HighDam power generation station and its 500 kV double-circuit transmission lines is used. It is shown from twostudy cases that proposed fault diagnosis system is useful in diagnosing multiple faults as well as simplefaults. Moreover, it has rapid reasoning, correct efficient and using flexible in a power generation stationand its transmission lines for online fault diagnosis. Finally, it enables, assists and supports the operatorof the power generation station control room to make the right decision, especially in case of loss of thecommunication with the dispatch center.