Modeling of Electrical Distribution System Reliability with Local and Interregional Bidirectional Centralized Electric Vehicle Charging Stations

This paper developed a method to evaluate the impact of bidirectional electric vehicle (EV) charging on power system reliability using Synergi Electric software. Load profiles, EV availability, and EV state-of-charge (SOC) were important factors considered in this study. The analysis in this study is based on local and interregional vehicle-to-grid (V2G) implementation at different load points in the system. In general, local V2G implementation improves system reliability over interregional V2G power flow. System Average Interruption Duration Index (SAIDI) and System Average Interruption Frequency Index (SAIFI) improvements increased with increasing SOC but were less progressive between higher SOCs. Based on the simulation results, the method proves to be sufficient to calculate SAIDI and SAIFI reliability indices as the simulation results corroborate with the theory.