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research-article

Smart Rotor with Trailing Edge Flap Considering Bend–Twist Coupling and Aerodynamic Damping: Modeling and Control

[+] Author and Article Information
Wenguang Zhang

No. 2 Beinong Road Changping District Beijing, 102206 China buaazwg@163.com

Ruijie Liu

No. 2 Beinong Road Changping District Beijing, 102206 China blademw@163.com

Yifeng Wang

No. 2 Beinong Road Changping District Beijing, 102206 China wyfrotor@163.com

Yuanyuan Wang

No. 2 Beinong Road Changping District Beijing, 102206 China wangouzhijia@126.com

Xu Zhang

No. 37 Xueyuan Road Haidian District Beijing, 110093 China zhangxblade@163.com

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received August 27, 2018; final manuscript received March 13, 2019; published online xx xx, xxxx. Assoc. Editor: Maurizio Porfiri.

ASME doi:10.1115/1.4043240 History: Received August 27, 2018; Accepted March 13, 2019

Abstract

Aerodynamic damping and bend–twist coupling significantly affect the dynamic response of wind turbines. In this paper, unsteady aerodynamics, aerodynamic damping, and bend–twist coupling (twist-towards-feather) are combined to establish a smart rotor model with trailing edge flaps (TEFs) based on a National Renewable Energy Laboratory (NREL) 5 MW reference horizontal axis wind turbine. The overall idea is to quantitatively evaluate the influence of aerodynamic damping and bend–twist coupling on the smart rotor and to present the control effect of the TEFs under normal wind turbine operating conditions. An aerodynamic model considering the dynamic stall and aerodynamic damping as well as a structural bend–twist coupling model with the influence of gravity and centrifugal force are incorporated into the coupling analysis. The model verification shows that the present model is relatively stable under highly unsteady wind conditions. Then, a robust adaptive tracking (RAT) controller is designed to suppress fluctuations in both the flapwise tip deflection and output power. The simulations show an average reduction of up to 63.86% in the flapwise tip deflection power spectral density (PSD) of blade 1 at the 1P frequency, with an average reduction in the standard deviation of the output power of up to 34.33%.

Copyright © 2019 by ASME
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