A New Double Closed-loop Control Strategy of PWM Rectifier Based on Traditional PI Control

Aiming at the shortcomings of slow dynamic response and poor anti-interference performance of traditional PI control used in the three-phase voltage-source PWM rectifier, a new double closed-loop control strategy was proposed. Based on the traditional PI control strategy, a new method for calculating the current command was added. Based on the instantaneous power theory, the active current command value was obtained through the calculation of active power and reactive power. A simulation model of three-phase PWM rectifier system was built in MATLAB/Simulink environment, and two different control strategies were compared and analyzed. The simulation results show that compared with the traditional PI control strategy, the new double closed-loop control strategy has good dynamic and static effects in the process of starting up and state switching, and has strong anti-interference and adaptive capabilities.