Petri Nets Fault Diagnosis System for a Large Power Station and its Transmission Lines

摘要

In order to assist and support the operation engineers in control center of a large power station to make rapid and reasonable decision in the critical situations. This paper proposes a fault diagnosis system based on Petri nets to estimate the faulty item/section(s) of that large power generation station and its transmission lines with solving the excess information which received in control center. The proposed methodology utilizes the final information of protective relays and corresponding circuit breakers to build a fault diagnosis model based on Petri net for each item/section(s). It can diagnose and estimate the faulty item/section(s) correctly for multiple faults as well as simple faults. Moreover, it examines the misoperation of circuit breaker based on the relays information and then determines the faulty item/section(s). In order to testify the validity and feasibility of the method, a computer simulation of High Dam power generation station and its 500 kV double-circuit transmission lines is used. It is shown from two study cases that the Petri nets fault diagnosis method has many merits such as: accurate fault diagnosis results, rapid reasoning, less storage memory, easy and flexible correctness of Petri nets fault diagnosis models for each item/section(s). Moreover, it can be applied into a large power generation station and its transmission lines for real time fault diagnosis.