Multi-objective Extremum Seeking Control for Enhancement of Wind Turbine Power Capture with Load Reduction

The Science of Making Torque from Wind

Xiao, Yan^1 ; Li, Yaoyu^1 ; Rotea, Mario A.^1

University of Texas at Dallas, Richardson

TX

75080, United States^1

关键词: Damage equivalent loads;    Extremum seeking control;    Model-free control;    Performance indices;    Simulation studies;    Structural fatigue;    Wind turbine control;    Wind turbine power;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/5/052025/pdf
DOI  :  10.1088/1742-6596/753/5/052025

来源: IOP

【 摘 要 】

The primary objective in below rated wind speed (Region 2) is to maximize the turbine's energy capture. Due to uncertainty, variability of turbine characteristics and lack of inexpensive but precise wind measurements, model-free control strategies that do not use wind measurements such as Extremum Seeking Control (ESC) have received significant attention. Based on a dither-demodulation scheme, ESC can maximize the wind power capture in real time despite uncertainty, variabilities and lack of accurate wind measurements. The existing work on ESC based wind turbine control focuses on power capture only. In this paper, a multi-objective extremum seeking control strategy is proposed to achieve nearly optimum wind energy capture while decreasing structural fatigue loads. The performance index of the ESC combines the rotor power and penalty terms of the standard deviations of selected fatigue load variables. Simulation studies of the proposed multi-objective ESC demonstrate that the damage-equivalent loads of tower and/or blade loads can be reduced with slight compromise in energy capture.