Design and Analysis of Sliding Mode Control for Battery Charging Applications

In Electric Vehicle (EV) charging stations connected loads are intermittent due to continuous variation of charging level battery. In this situation, the linear controller like P, PI, and PID does not offer a quick and good transient response to the EV charging converter. In some cases, EV charging stations push to instability region for abrupt change in loads. Therefore, this research work focused on investigation of non-linear controllers for EV battery charging station. This paper investigates the performance of Hysteresis Controller (HC) and Sliding Mode Controller (SMC) for EV charging station under dynamic load conditions. The hysteresis controller and sliding mode controller are developed for buck converter fed EV charging stations and its performance is analyzed using pole zero plot and bode plot methods. From the investigation it is found that SMC offer optimum gain margin and phase margin under dynamic load condition for EV charging station.