Design of Full-order State Observer and its Speed Estimation for Induction Motor Passivity Control

In order to realize the high dynamic performance of induction motor, a passive speed control scheme of induction motor based on full-order state observer and speed adaptive estimation is proposed for the non-linear nature of the motor. With the analysis of the passive of induction motor and the relationship between passive and stability, a scheme of asymptotic stability torque tracking controller is designed in this paper. In order to solve the problem that the rotor current is difficult to be observed, it was proposed that full-order state observer was designed based on rotating coordinate and the rotor current and rotor flux are as the state variables. The observer is used to estimate the speed, so that the induction motor without speed sensor passive control can be achieved. The simulation results show that the method is simple and effective, and the rotor current and speed are accurately estimated by the full-order observer and effectively improve the dynamic and static performance of the induction motor.