Complementary Sliding Mode Control for Variable Speed Variable Pitch Wind Turbine Based on Feedback Linearization

Abstract

Since the dynamic of the wind turbine is typically nonlinear, the conventional linear pitch control method results in a large deviation of the generator power. To address the aforementioned issue, a variable speed variable pitch control method combining feedback linearization and complementary sliding mode control (FLCSMC) for wind turbine is proposed. The affine nonlinear model of the system is investigated and then globally exactly linearized by means of feedback linearization theory. On this basis, compared with the conventional sliding mode control, the complementary sliding mode control with excellent tracking accuracy is designed to improve the performance of the system. Finally, the proposed controller is validated on the aeroelastic wind turbine using FAST (Fatigue, Aerodynamics, Structures, and Turbulence) simulator. The comparative experimental results demonstrate that the proposed FLCSMC in this paper can decrease the fluctuations of generator power and generator speed effectively and get better stability and robustness.