Adaptive sliding mode control strategy for a wind turbine systems using a HOSM wind torque observer

Abstract

The efficiency of the wind power conversions systems can be greatly improved using an appropriate control algorithm. In this work, an adaptive control scheme based on sliding mode control theory is proposed. In the control scheme, a robust aerodynamic torque observer based on super twisting algorithm is designed in order to avoid the wind speed sensors. The proposed robust observer is based on the high order sliding mode (HOSM) theory, that presents a good performance under system uncertainties and avoids the chattering problem that can appear in the traditional sliding mode observers. The stability analysis of the proposed HOSM observer is provided using the Lyapunov stability theory. Finally simulated results show that the proposed adaptive sliding mode control scheme provides a good performance and demonstrates that this control scheme is robust with respect to system uncertainties and external disturbances.