An operational strategy for an energy storage system in a renewable supported PHEV charging station

Abstract

In this busy world charging stations are necessary at various places for effective use of Electric Vehicles (EVs). Energy storage systems (ESSs) are crucial at charging stations to make the stations more reliable, efficient and economical. The ESSs is a solution to reduce negative impacts of the station on the grid and to decrease the energy costs of the station. In this paper an approach is presented to find out the minimum required size of the ESS for a fast charging station. Firstly, by considering PHEVs demand in a station and electricity price of the grid the size of the Storage system required in the station is determined. This storage system is charged during off peak hours and discharged during the peak hours. To charge the ESSs apart from the grid integration of PV plant at the charging station is discussed. As an alternative when ESS energy is not enough during peak hours, vehicles charging is prioritized based on their state of charge (SOC), arrival and departure times.