Three-phase Voltage PWM Rectifier Based on EID and Improved ADRC Control

In high-precision occasions, three-phase voltage PWM rectifier based on conventional voltage-current dual closed-loop control suffer from current harmonics and poor interference immunity. In order to effectively alleviate the above problems, partial feedback linearisation control is introduced in the current inner loop, and equivalent input disturbance (EID) based active disturbance rejection control (ADRC) control is introduced in the voltage outer loop, and the fal function is changed to qin function to solve the jitter problem that occurs when the inflection point is not smooth. Firstly, the mathematical model of the three-phase voltage PWM rectifier in the dq coordinate system is established, and its underactuated characteristics are analysed; Then, the feedback linearisation controller is designed with current as the actuated variables, and the improved EID\ADRC controller is designed with voltage as the underactuated variable; Finally, simulation experiments are carried out by Matlab/Simulink to verify the feasibility of the proposed method.