Analysis and Modeling of Four-Quadrant PWM Rectifier

Different from the traditional AC/DC converters, the four-quadrant converters are widely used in modern AC power transmission systems because of their advantages such as two-way flow of energy, adjustable power factor on the grid side, and stable voltage on the DC side [1]. In this paper, the mathematical model of four-quadrant PWM rectifier is presented, and on this basis, the constant-frequency double closed-loop control strategy is adopted to control the DC voltage and the power factor of the grid side. The determination method of voltage and current PI regulator parameters is analyzed, and the influence of ac side inductance and DC side capacitance on the whole system is pointed out, and the design method is given. Through the establishment of simulation model under MATLAB/ Simulink, it is proved that this model can realize the DC voltage and power factor control at the side of the network, has a good load regulation ability, and can switch between the rectifier mode and the inverter mode, realizing the two-way flow of energy. This paper has some guiding effect on the design of four-quadrant PWM rectifier.