Active disturbance rejection control and multi-objective optimization for wind turbine active power regulation

Abstract

Wind energy is anticipated to become a backbone of the future energy system and provide active power ancillary services. In this paper, a novel active power control (APC) scheme is proposed to deal with the active power regulation problem for the wind turbine. Firstly, an APC strategy dual-activating the pitch action and the rotor kinetic energy is designed to specify the reference signals of pitch angle and rotor speed. Next, a multi-variable controller based on active disturbance rejection control (ADRC) theory is proposed to implement the APC strategy, wherein the theoretical proof of the convergence result is provided. Then, a multi-objective coronavirus herd immunity optimization algorithm is proposed to find out the Pareto solution of controller parameter tuning, in which the power tracking accuracy and fatigue load mitigation are considered. Finally, the performance superiority of the proposed APC strategy is verified on a 5 MW OpenFAST wind turbine simulator in case of the IEC turbulence wind field and the reg-D standard test signal into account. Compared with the conventional pitch angle control and rotor speed control strategies, our APC scheme is able to accomplish the task of power regulation with smaller tracking root mean square error, shorter pitch travel and lighter fatigue load.