Abstract:

This paper addresses the planning and operation problem from the perspective of grid stability by determining the load profile of electric vehicle charging stations (EVCS) and subsequently quantifying the impact of EVCS on the voltage profile of the distribution system. A coordinated charging strategy is used to determine the load profile of EVCS constrained by both grid-to-vehicle (G2V) and vehicle-to-grid (V2G) rulesets. Voltage sensitivity factor (VSF) and Voltage Stability Index (VSI) were used to quantify the impact of the EVCS load profile on the distribution system. This work proposes a novel algorithm to determine the voltage stability indices given EVs' refuel and travel patterns in a region.