Reliability Evaluation Algorithm for Distribution Network with DG

Abstract

The paper proposed reliability evaluation algorithm for distribution network considering the act of weather and DG, the algorithm develops weather model for average failure rate to shows the influence of normal weather and adverse weather on distribution network reliability. Then, the optimal island partition method is proposed to determine the power supply scope after power failure. The improved minimal path method is employs to calculate the reliability index of distribution network with DG. The test covers four cases including without DG and weather, only DG, only weather, and both DG and weather are calculated and compared from the aspects of load points, feeders and system reliability indices. The results about SAIFI, SAIDI, CAIDI and ASAI show that the proposed algorithm can take the influence of distributed power supply and weather into account. The impact of distributed generation and adverse weather on distribution network reliability is studied. Considering both DG and weather, the reliability of distribution network can reflect the actual condition more accurately, which proves the validity of the method and the model.