Semi-active frequency tracking algorithm for control of flapwise vibrations in wind turbine blades

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Semi-active frequency tracking algorithm for control of flapwise vibrations in wind turbine blades

Arrigan, John; Pakrashi, Vikram; Basu, Biswajit; Nagarajaiah, Satish
Date: 2009
Copyright: © 2009 The Institution of Engineering and Technology. This paper is a postprint of a paper submitted to and accepted for publication in Proceedings of IET Irish Signals and Systems Conference (ISSC 2009) (CP559) Dublin, Ireland, 10-11 June 2009, ISBN: 978 1 84919 213 2 and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library http://dx.doi.org/10.1049/cp.2009.1688
Citation: Arrigan J., Pakrashi V., Basu B., Nagarajaiah S., 2009. Semi-active frequency tracking algorithm for control of flapwise vibrations in wind turbine blades. In: IET (Institution of Engineering and Technology) Irish Signals and Systems Conference (ISSC 2009). Dublin, Ireland 10-11 June 2009. Stevenage, U.K.: Institution of Engineering and Technology
Published Version: 10.1049/cp.2009.1688

Abstract:

The increased size and flexibility of modern multi-Megawatt wind turbines has lead to their dynamic behaviour becoming an important design consideration. The aim of this paper is to develop a semi-active control algorithm using Semi-Active Tuned Mass Dampers (STMDs) to reduce vibrations in the flapwise direction. The model developed in this study considers only the structural dynamics of the turbine and includes the coupling between the blades and tower. The algorithm developed uses a frequency tracking technique based on the Short Time Fourier Transform (STFT). This allows real-time tuning of the dampers to the dominant frequencies in the system. Numerical simulations have been carried out to study the effectiveness of the STMDs for steady and turbulent wind loading

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