Super-twisting control of offshore wind turbine in region III with self-tuning adaptive gains

In this paper, a new self-tuning strategy for super-twisting sliding mode controller is applied for offshore wind turbine system operating in region III. An algorithm is used to provide self-tuning gains for the purpose of improving the performance of the controller in the presence of unknown perturbations. Adaptive protocols are designed with reduced parameters (only one tuning parameter known as targeted accuracy in the controller part) without having knowledge of the system’s uncertain bounds. The floating wind turbine is a highly nonlinear system and the main objectives are the limitation of platform pitch motion, blade fatigue load reduction, and power regulation. Here, by using the FAST simulator the designed controller has been tested, and achieved results demonstrate the capabilities of the proposed method.