Sensor fault-tolerant control of wind turbine systems

In this paper, an H_∞ method based controller is designed to achieve high performance in extreme wind speed profile and tolerate possible actuator faults. This controller uses generator and rotor speed measurements and blade pitch actuator as control input. Moreover, a sliding mode fault detection and isolation (FDI) system is applied to reconstruct and compensate wind turbine´s sensor faults. The controller parameters is obtained by solving a bi-linear matrix inequality. Designed controller uses the FDI output to regulate the wind turbine power in faulty condition and above rated wind speed. Closed loop performance is assessed through implementation of FDI and proposed controller, on a 5-MW benchmark wind turbine simulator, emulating realistic operation condition.