Maximum Power Tracking Control of Wind Energy Conversion Systems Based on Prescribed Performance Function and Extended State Observer

Abstract

This paper is concerned with maximum power tracking of variable-speed wind energy conversion systems under low wind speed. First, by introducing a prescribed performance function and an error transformation technique, a maximum power tracking method with prescribed performance is proposed, such that the steady state and transient performance of the system can be analyzed quantitatively. Meanwhile, an extended state observer is utilized for real-time estimation of system uncertainties including aerodynamic torque and disturbances. Then, the cascade system theory and input-to-state stability are used to analyze the stability of the closed-loop system. Finally, simulation results demonstrate the feasibility of the proposed maximum power tracking controller based on prescribed performance function and extended state observer.