Development of Smart Charging Scheduling and Power Management Strategy of a PV-ESS based Scalable EV Charging Station

This paper describes smart power management and charging scheduling strategy for a multiple port electric vehicle (EV) charging station, connected to battery storage systems and renewable energy sources. The station can charge scooters and passenger cars at different power levels. The energy management optimizes the power sources by analyzing the overall load demand, the electricity tariff, and the information provided by the EV user. The station's control system is set up to satisfy the charging demand primarily with a solar photovoltaic (PV) array and an energy storage system (ESS) as a battery. In the case of PV power generation and battery power shortage, it draws power from the grid to fulfill the charging demand. Additionally, a charging scheduling strategy is described in which the charging current setpoint is estimated by an optimization process in the local charger controller.