Self-scheduled LPV controller synthesis for doubly-fed induction generators

This paper presents a new current control design for doubly-fed induction generators in wind turbine systems, where the control is implemented on the rotor side. The mechanical angular speed of the rotor is considered as a time-varying parameter. A self-scheduled controller is then designed for the inner current loop in order to guarantee decoupling of torque and power factor, and to achieve high robust dynamic performance for all admissible trajectories of the rotor speed in the operating range. The closed loop system performance with the proposed controller is compared with a conventional control scheme. Performance and robustness of the controlled system are demonstrated via simulations.