Abstract: A nonlinear auto disturbance rejection controller (ADRC) has been developed to ensure high dynamic performance of induction motors. Compared with the existing high-order ADRC-based speed control structures, the proposed method does not need to estimate the rotor flux. By using extended state observer (ESO), ADRC can accurately estimate the derivative signals and precise decoupling of induction motors is achieved. In addition, the proposed strategy realizes the disturbance compensation without accurate knowledge of induction motor parameters. The simulation and experimental results show that the proposed controller ensures good robustness and adaptability under modeling uncertainty and external disturbance. It is concluded that the proposed topology produces better dynamic performance, such as small overshoot and fast transient time, than the conventional proportional/integral (PI) controller in its overall operating conditions.

Keywords: Auto disturbance rejection controller, rotor flux, extended state observer