Reliability evaluation of distribution networks considering maintenance strategies and equipment health indexes
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Abstract:
To overcome the defects of traditional reliability evaluation methods of distribution networks in which the equipment difference and timeliness are usually not taken into account, a distribution-network reliability-evaluation method which comprehensively considers maintenance strategies and equipment health indexes is proposed, so as to reasonably evaluate the reliability of a distribution network, and provide a reference for the distribution network planning and maintenance arrangement. Firstly, the health indexes of equipment are calculated by the logistic regression model, and the failure rate, reliability and unreliability of equipment are calculated with the health indexes; secondly, the feasible operation schemes and fault states of the distribution network are enumerated based on the minimum path method and the fault enumeration method; finally, the failure rate and the failure consequence of the entire system are calculated with the equipment failure rates and load information. The reliability index of distribution network can be obtained by integrating the overall failure probability and consequence. The effectiveness of the proposed method is verified by the simulation analysis of a 10 kV practical power grid in the southern China.
