Sliding Mode Design Control Applied to the Battery Electric Vehicle Ultra-Fast Charger Using a Vienna Rectifier

The focus of this study is to design a new nonlinear controller for a 50 kW battery electric vehicle (BEV) ultra-fast charger based on the Vienna rectifier topology. This controller, using the sliding mode control (SMC) approach, is developed in order to regulate the DC-bus voltage to its desired value, provide that the filtering capacitor voltages are balanced, ensure that the current consumed from the grid has a low total harmonic current distortion (THDi) and that the power factor is unity. In this work, a simplified Space Vector Pulse Width Modulation (SVPWM) is used as a modulation technique. The performance of the studied control strategy is simulated and verified by the MATLAB/Simulink environment and compared with the classical Proportional Integral (PI) controller. From the simulation results, the sliding mode controller is faster and more efficient in terms of reference tracking. Besides, the nonlinear controller reduces the THDi considerably (less than 5%) which meets the IEEE 519-2014 standard.