Fuzzy self-tuning control strategy for PWM rectifier voltage fast response

Aiming at the voltage response rate of the traditional dual closed-loop control system of the three-phase voltage type pulse width modulation(PWM) rectifier on the direct current(DC) side. In this paper, Based on the underactuated system theory, the DC voltage control process of PWM rectifier is studied theoretically. The mathematical model of PWM rectifier in rotating coordinate system is established, and its underactuated characteristics are analyzed, a cascade double closed loop control structure is proposed. A current inner loop controller is designed using partial feedback linearization strategy. In order to improve the DC side voltage response speed, the fuzzy control of voltage outer loop is proposed. The PWM rectifier c ontrol system designed in this paper has better steady-state and dynamic performance, better improve the DC side voltage response rate. The simulation results prove the effectiveness of the designed control scheme.