Recursive model free control of variable speed wind turbine systems

The paper deals with the recursive model free control of horizontal variable speed wind turbines, which makes possible to obtain a compromise between the wind energy limitation, the rotor speed reference tracking and the decreasing of solicitations induced in the mechanical structure of the turbine. The wind turbine system dynamics is described by a multi-input multi-output nonlinear mathematical model. A recursive controller is proposed which uses only the measurement of the system output and does not require identification of turbine parameters. The effectiveness and the robustness of the new controller are analyzed by numerical simulation.