Double closed-loop control of converter based on active disturbance rejection

Abstract

To overcome the disadvantages of complex control, poor robustness and unstable output voltage of traditional doubly-fed induction generator grid-side converter, a double closed-loop control system of DC bus voltage outer loop based on active disturbance rejection control (ADRC) and current inner loop based on PID is designed. By controlling the output current of the converter, the purpose of maintaining the constant DC bus voltage of the PWM converter on the grid-side and keeping the output unit power factor of the stator side is achieved. Not only can good control effect be achieved, but also the hardware complexity of the system can be reduced and the utilization efficiency of the doubly-fed induction generator can be improved. The simulation results show that the double closed-loop control strategy can effectively maintain the DC bus voltage stability of the grid-side converter, ensure that the DC voltage fluctuation is small, reduce the voltage distortion rate, and have a strong anti-interference ability.