Reliability evaluation algorithm for distribution power system

Abstract

This paper presents a new method for evaluating distribution system. It is based on the properties of elements in fault delivering. The algorithm is suitable for evaluating reasonably complex EDNs with multiple sub feeders. It applies a forward-search-method to identifying the section controlled. First, the distribution system is simply defined into two parts called major-network and sub-network. Second, the upstream fault indices of all nodes in sub-network can be legibly calculated by utilizing the properties of elements in upstream fault delivering. Third, load comprehensive reliable indices on the major-network and downstream nodal reliable indices on the branch-appending- points are determined according to the failure mode and effect analysis (FMEA) method, and by using the properties of elements in downstream fault delivering, the upstream fault indices of all nodes in sub-network also can be calculated. At last, by synthesizing the upstream and downstream reliable indices, the reliable indices of all nodes in the sub-network can be obtained. Compared to the FMEA method, the proposal method not only has the same effect but also save computing time. The extended test system presented in this paper and the concepts presented assist in satisfying this requirement. © 2012 Springer Science+Business Media B.V.