Research on Vector Control Strategy of Three Phase VIENNA Rectifier Employed in EV Charger

As one of the three level BOOST converter clamping structure, compared with some other three-phase PFC rectifier, a three-phase three-level VIENNA rectifier has significant advantages in improving the power factor of equipment, reducing the power consumption of switches and decreasing the total harmonic distortion of current. This kind of rectifier can improve the power density of power system effectively, especially for the requirement of high power DC charging quickly for electric vehicles. First, the working principle of VIENNA topology rectifier is analyzed. Then, the mathematical model of three-level vector, two-level mathematical model and corresponding equivalent circuit are established respectively. After that, the control strategy of SVPWM is presented. Finally, the VIENNA rectifier control simulation model is built through MATLAB/Simulink, and the simulation analysis proves that the control strategy is simple and feasible with good dynamic performance and static performance.