Tabu Search Application in Fault Section Estimation and State Identification of Unobserved Protective Relays in Power System

Fault section estimation[1] aims at identifying faulty components (sections) in a power system by using information on operations of protective relays and circuit breakers. Several kinds of methods have so far been developed, such as the logicbased[2,3], expert system-based[4–6], artificial neural network-based[7] and optimization-based[8–14] methods. Of these methods, the expert system-based method is the most established. Up to now, many kinds of expert systems have been developed using the rule based[4] and model based[5,6] methods. In order to achieve precise inference especially for the complex fault cases, the rule based expert system must involve a great number of rules describing the complex protection system behaviour. Maintenance of a large knowledge base is very difficult. On the other hand, the model based system is easy to maintain, but the inference process is time consuming.

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