The simplified active disturbance rejection control for permanent magnet synchronous motor drive system

An active disturbance rejection control (ADRC) has been applied on both the speed loop and the current loop of permanent magnet synchronous motor (PMSM) drive system to ensure high dynamic performance and enhance steady-state accuracy. By using the extended state observer (ESO), ADRC can accurately estimate the state and the lumped uncertain disturbances accurately without requiring exact mathematic model of system, and adds a feedforward compensation item based on the estimated lumped disturbances to the speed controller and current controller respectively. A simplified ADRC is proposed to reduce complex calculations. The simulation results show that the strategy of both cascade ADRC can realize better dynamic response, such as smaller overshoot and faster transient, and higher precision in the case of variation of the load disturbances and parameters than conventional PID controller.