Modelling of an Electric Vehicle Charging Station with PWM Rectifier to mitigate the Power Quality Issues

The conventional electric vehicle charging stations are using controlled rectifiers with closed loop operation. In this type of stations, power quality of the grid is the major concern for the installation of charging station in various locations. If the multiple electric vehicles are charging in one station, it produces more harmonic distortion and very less power factor to the grid. To avoid the power quality issues, the proposed system of electric vehicle charging station is capable to control the power quality issues. The system contains single grid connected rectifier with DC capacitor where the batteries of electric vehicles are connected. The process of power transfer from the grid to the battery is controlled by the closed loop controller. The separate DC to DC converter is connected to each vehicle battery which controls the DC link voltage to the suitable charging voltage. This is achieved by using closed loop charge control of battery and converter. The modelling of the proposed system and simulation of the entire system is explained in this paper. Simulations are implemented in the MATLAB/Simulink platform to explain the power flow and waveforms of the proposed system. The results of the simulation show the adaptability and controllability of the proposed system. The harmonics generated from the system is analyzed through the Fast Fourier Transform analysis (FFT) in the MATLAB/Simulink.