A Reliability Index Approach for Assessment of Electrical Distribution System Under the Influence of Disturbances: A Case Study of Nigerian Power System

Abstract

Reliable power distribution is essential for economic development and quality of life, making it crucial to assess the system's performance during faults and other disruptive events. This study investigates the reliability condition of electrical distribution systems under the influence of disturbances by employing reliability indices such as Loss of Load Probability (LOLP), Loss of Load Expectation (LOLE), Expected Energy Not Supplied (EENS), and Expected Cost of Interruption (ECOST) to quantify the reliability levels. Simulations were performed using MATLAB R2021 and the approach was validated on Dada 46-bus Nigerian distribution feeder. The results show that the values of LOLP, LOLE, EENS and ECOST of the system were tremendous increase as the failure rate and repair time varied, thus, not secured for delivering a reliable power system during the contingency The findings contribute to improving maintenance strategies, fault response, and long-term planning for power utilities.