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