Pitch Angle Control in Wind Turbines Using a Robust MRAC and σ Correction

Wind energy is one of the most important renewable energy sources. In modern wind turbines, two critical control levels exist, including pitch angle control and power converter control. Pitch angle control plays a significant role in determining the power output of the wind turbine, as well as maintaining the health of the blades and the overall structure of the turbine. Disturbances in variable-speed turbines can lead to inefficiencies in classical control methods. This paper utilizes a Model Reference Adaptive Control (MRAC) approach, but its performance becomes unstable under certain operating conditions. To enhance the robustness of MRAC, sigma correction is employed as Robust Model Reference Adaptive Control (RMRAC). The proof stability of proposed strategy is done in this paper. The methods used in this study are evaluated based on real data from a 2.5 MW MAPNA wind turbine. The results of the designed controller based on adaptive reference model control demonstrate improved performance compared to classical control and adaptive reference model control alone, showcasing better adaptability to changes and resistance to disturbances. Pitch angle control in wind turbines using robust adaptive reference model control achieves desired power and rotational speed with minimal changes.