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1. (WO2013113656) A METHOD FOR DAMPENING OSCILLATIONS IN A WIND TURBINE

Pub. No.:    WO/2013/113656    International Application No.:    PCT/EP2013/051569
Publication Date: Fri Aug 09 01:59:59 CEST 2013 International Filing Date: Tue Jan 29 00:59:59 CET 2013
IPC: F03D 7/02
Applicants: ALSTOM RENOVABLES ESPAÑA, S.L.
Inventors: PINEDA AMO, Isaac
Title: A METHOD FOR DAMPENING OSCILLATIONS IN A WIND TURBINE
Abstract:
A method for dampening oscillations in a wind turbine, the wind turbine having a tower (1), a rotor (3) rotating about an X axis, and a plurality of blades (4) with adjustable pitch, said method comprising monitoring the fore-aft oscillation of the tower in the direction of the X axis, at the 2nd or a higher bending mode frequency; determining a compensating torque to be applied by the rotor to the tower about a Y axis, which is horizontal and at right angles to the X axis, for dampening said oscillation at the 2nd or higher bending mode frequency; determining for each rotor blade an adjustment of the pitch angle suitable to generate said compensating torque about the Y axis; and adjusting the pitch angle ß1, ß2, ß3 of at least one of the individual blades to generate at least part of said compensating torque.