Energy Management Strategy of Solar PV-Battery and Diesel Generator Based Electric Vehicle Charging Station

This paper presents a smart strategy for a charging station in which a single voltage source converter (VSC) does a multiple task such as power management among different energy sources and charging the electric vehicles (EVs), regulation of voltage and frequency of the generator, harmonics current compensation of nonlinear loads. The charging strategy is designed such that it primarily takes power from the solar photovoltaic (PV) array and a storage battery. In absence of these two sources, the charging station wisely takes power from the grid and the squirrel cage induction generator (SEIG) based diesel generator (DG) set. The DG set is operated such that it generates up to 33% more power than it rated capacity without surpassing the rated current in the windings, therefore, the size of the DG is reduced. Moreover, the voltage and frequency of the generator, are regulated at its rated values without a mechanical speed governor.