Distribution System Reliability Evaluation Based on Pseudo-Sequential and Network-Equivalence

A hybrid approach based on the pseudo-sequential sampling and the network-equivalence techniques is proposed for distribution system reliability evaluation in this paper. In pseudo-sequential sampling, a failure state is obtained based on the non sequential simulation at first, then the whole system interruption I(a set of successive failure states) is acquired by the forward/backward simulation associated with the given failure state. The average failure rate of load points can be calculated easily by the mean value of the outage duration in all the interruptions. The calculation error introduced by the hybrid approach possibly caused by the network equivalence is also analyzed in detail in this paper. Case studies on the IEEE RBTS test system are given and discussed, which validate the feasibility and effectiveness the proposed model for distribution system reliability evaluation.