Nonlinear Wind Turbine Controller for Variable Power Generation in Full Load Region

This paper deals with the model-based nonlinear control design for wind turbines in the full load region using Takagi-Sugeno techniques. The generator torque of the wind turbine is considered as a varying parameter of the system, which is adjusted by an external operator. This enables the possibility to provide ancillary services. The highly nonlinear behavior of the wind turbine is handled by the transfer of the nonlinear model to a Takagi-Sugeno structure without any further approximation. This enables nonlinear controller design based on parallel-distributed compensation. The controller is adjusted to meet the requirements arising from the operating range of the wind turbine and the stability for the modified control law is shown. Simulation studies are conducted using a wind turbine model with a higher degree of freedom compared to the design model to give a first impression of the loads occurring from the variable generator torque and the employed controller.