Harmonic Reduction Strategies for EV Charging in Power Systems Using Shunt Active Power Filter

The widespread adoption of electric vehicles (EVs) globally and the large-scale integration of EV chargers into the distribution grid have led to significant concerns about the quality of power and current in the system. An EV needs a charging station for battery charging, the harmonics thus introduced owes to frequent use of power electronics devices. In order to compensate the harmonics, and reduce the reactive power needed for EV charging stations, a shunt active harmonic filter (SAHF) has been introduced. This paper implements dq method-based control of SAHF and a highly effective control loop for generating reference current. A PWM switching technique for 3L-NPC inver-ter has been used in the proposed work. The presented paper includes design aspects of power circuit, controller parameters of a SAPF, and system performance for the specified parameters. The efficacy of the designed parameters of SAPF for reactive power and harmonic compensation has been shown using the simulation results. Based on these results, it can be deduced that the compensation process based only on sensing line currents, is instantaneous and the implement is easy. The THD of the source current in this proposed work is well below 5%, the limit as per the IEEE-519 standard.