The SVPWM and PR control for single-phase three-level rectifier

This paper presents a space vector pulse width modulation and proportional resonant control scheme for single-phase three-level rectifier for electric railway traction applications. The proposed SVPWM modulation has been tailored to the single-phase rectifier without an additional PLL. Moreover, vectors and vectors sequence have been carefully designed to achieve neutral point voltage balance. Based on the analysis of transfer function of rectifier system, the defect of classical PI control scheme has been discussed. And then, PR control is deployed in the current inner-loop to eliminate steady-state error and enhance the control effects. A series of simulations and experimental tests demonstrate the effectiveness of SVPWM+PR control.