Coordinated control strategy of energy storage system with electric vehicle charging station

Energy storage system (ESS) is regarded as a promising supplement for electric vehicle (EV) fast charging station. This paper works on the coordinated operation of EV fast charging stations with ESS. Firstly, considering characteristics of EV fast charging load, charging and discharging periods of ESS within a day are optimized based on historical average charging load. Secondly, a real-time control strategy is proposed not only to follow and smooth the charging load but also to avoid electricity absorption from power grid in high-price periods. Case studies are conducted on a practical EV fast charging station with battery ESS installed. Simulation results demonstrate that the proposed control method can greatly reduce the electricity purchase cost and smooth the power demand within the charging station.