Sensitivity analysis of distribution system reliability for identifying the critical elements

Abstract

In this paper, a novel approach is proposed for investigating the critical elements of distribution systems based on the sensitivity analysis of reliability indices in terms of changes in the failure rate of various system elements. By using the proposed approach, it is possible to determine the impact of distribution network components based on their types (overhead lines, cable, transformers, substation, etc.) on the system reliability. Therefore, the appropriate strategies can be developed to improve the system reliability, corrective actions, and strict repair strategy for critical points. One of the advantages of the proposed method is its flexibility for the existing conditions of the distribution system and it doesn't require specific infrastructure or studies with widespread mathematical complexity. The proposed method is applied to the actual 20 kV distribution network of University of Kashan by using the DIgSILENT, MATLAB, and their interconnection. This feature (link between MATLAB and DIgSILENT) would be very interesting for the engineers of distribution companies, because its implementation is simple. The results illustrate the usefulness of the proposed approach in different situations.