Adaptive super-twisting control of floating wind turbines with collective blade pitch control

Abstract

Abstract This paper proposes an adaptive super-twisting controller for floating wind turbine based on collective blade pitch control. This adaptive second order sliding mode control scheme being efficient for systems with uncertainties and external perturbations, which is compared with the traditional gain scheduled PI (GSPI) controller. It is shown that this kind of controller requires reduced knowledge about the system (only the relative degree) and the gain tuning effort is also reduced given that the operating domain is large versus GSPI controller. Simulation results show high performances of the proposed controller for rotor speed regulation and reduction of platform oscillations in Region 3 of the floating wind turbine.