Voltage Sag Reduction & Harmonics Suppression of Uncontrolled Six Pulse Rectifier Electric Vehicle Charger

Abstract

Electric vehicles are being seen as the future of vehicular transportation but even though in modern days the number of electric vehicles is increasing rapidly a lot of challenges are there for charging issue. Two major challenges are voltage sag & harmonic pollution in the grid. Voltage sag degrades the battery life cycle & harmonic distortion affects the power factor of the grid. This paper proposes a charger model for reducing the impact of voltage sag proposes a design of 6-pulse rectifier charger where a freewheeling diode is used with a capacitor to compensate decreased voltage caused by voltage sag where it can withstand the voltage sag even if the value of it is greater than 0.7 pu. Harmonic pollution is determined by FFT analysis in MATLAB Simulink environment. A C-type high pass filter is designed to reduce harmonics resulting THD factor to improve.