Abstract
The Transition Region Control for large wind turbine involves the smooth transitioning from Region II to Region III and back, as well as ensures that the turbine has rated speed and rated torque while switching to Region III from Region II. In this paper, we use the theory of Adaptive Disturbance Tracking Control (ADTC) with wind speed and partial state estimation, and state feedback to achieve this goal. To ensure the rated torque while switching to Region III, the generator torque has been varied linearly with the generator speed, whereas to achieve rated generator speed at Region III, the tracking ratio (Q) has been linearly adapted based on the estimated wind speed. Applicability of this scheme has been justified by implementing and simulating the controller to NREL’s 5 MW wind turbine.
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