On Singular Perturbations of Flexible and Variable-Speed Wind Turbines. (13th May 2012)

• Record Type: Journal Article
• Authors: Oulad Ben Zarouala, R.; Vivas, C.; Acosta, J. Á.; El Bakkali, L.
• Other Names: Williams Paul Academic Editor.
• Is Part Of: International journal of aerospace engineering. Volume 2012(2012)
• Publication Date: 2012-05-13
• Subjects: Aerospace engineering -- Periodicals; 629.105
• DOI: 10.1155/2012/860510
• Languages: English
• ISSNs: 1687-5966

Abstract

Abstract : A model for the mechanical dynamics of a wind turbine is developed, which is the composition of three physical mechanisms: flexion, torsion, and rotational dynamics. A first contribution is the identification of the essential physical parameters that provide a time-scale separation of these three mechanisms. Under the assumption of singular perturbations the time-scale separation allows to work with a reduced model of order one. This reduction has been essential for the control of this system allowing to control designers to take into account only the reduced-order model. A second contribution consists in employing a measurement of the fore-aft nacelle acceleration with the reduced model, together with a Kalman filter to estimate the flexible DOFs of the system (tower and average blade deflection). The successful approach is tested on high-order nonlinear aeroelastic simulator (FAST).