Dynamic output feedback linearizing control of a doubly-fed induction motor

In this paper a controller for doubly-fed induction motor is presented. It guarantees speed tracking and reactive power regulation at the stator side. A current-fed rotor is assumed and the speed measurement is required as feedback. An original approach is used to design the controller. It is based on the decomposition of the machine model in two coupled subsystems: the stator-flux and the speed subsystems. With the proposed solution, the controlled flux subsystem is exponentially stabilized independently of the speed behavior and the speed subsystem is asymptotically linearized and decoupled from the flux dynamics. The global asymptotic stability of the overall system is theoretically proven. Simulation results confirm the good quality of the proposed controller.