Induction Motor Drive System Based on the Flux Observer LESO and LADRC

It is difficult to develop an accurate mathematical model for the induction motor and the robustness of vector control system is poor. This paper firstly uses the linear active disturbance rejection controller (LADRC) in inductor motor drive system. The controller is not overly dependent on the accurate mathematical model of motor, so the system is inherently robust, and it can estimate and compensate the general disturbance that includes the unknown internal dynamics and the external disturbance, so the rotor flux decouples with torque completely. Furthermore, the linear extended state observer (LESO) is used to observe rotor flux and it is robust to rotor resistance. Simulations show that the above control strategy has a better static and dynamic performances and the strong robustness.