Full-order nonsingular terminal sliding mode control for variable pitch wind turbine

This paper proposes a full-order nonsingular terminal sliding mode control method for a variable-speed wind turbine operating in the above-rated regime considering the model uncertainty caused by the constantly changing operating point and external disturbances. The proposed control method can not only converge to the equilibrium point in finite time, but also overcome the model uncertainty and guarantee the stability of the control system. The proposed control strategy is designed to minimize rotor speed error. A group of actual data obtained from a wind farm is used in the simulation study, the result shows that the proposed method can maintain the rotor speed at the rated value and keep the output power stable. In order to assess the effectiveness of the proposed method, the paper compares the proposed method with traditional terminal sliding mode control. The results confirm that the proposed method is fast, robust, and effective.