Shunt Active Filter for Harmonic Compensation at Electric Vehicle Charging Station based on p-q Theory

In recent times, to reduce the dependency on fossil fuels there is a significant increase in electric vehicle usage. Many EV charging stations are being established and connected to the power transmission grid. During the charging process, harmonics are introduced in the grid by the high power chargers which are present in the charging station and can cause power quality issues. In this paper, a model of equivalent charger and electric vehicle charging facility is established to analyse the supply current harmonics. Then the compensating devices such as passive and active harmonic filters are utilised to eliminate the harmonics in order to enhance the power quality of the grid.The mathematical model for the configuration of filters is also presented . The Matlab/Simulink platform is used for the simulation of EV charging station, which includes high power chargers and harmonic compensators.The simulation results of supply current are compared before and after the introduction of passive and active harmonic filters.The results shows that after the compensation by filter equipments the current harmonics are within the specified limits.