A method for damping tower vibrations in a wind turbine...

F - Mech Eng,Light,Heat,Weapons – 03 – D

Patent

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F03D 7/04 (2006.01) F03D 11/00 (2006.01)

Patent

CA 2627148

A method in connection with a wind turbine installation for damping tower vibrations, in particular a floating wind turbine installation comprising a floating cell, a tower arranged over the floating cell, a generator mounted on the tower that is rotatable in relation to the wind direction and fitted with a wind turbine, and an anchor line arrangement connected to anchors or foundations on the sea bed. The tower's eigenvibrations, .omega.eig, are damped by, in addition to control with the controller in the constant power or RPM range of the wind turbine, an increment, .DELTA..beta., being added to the blade angle of the turbine blades on the basis of the tower velocities, .DELTA.Z , so that the eigenvibrations are counteracted. The vibrations in .beta. that have frequency .omega.eig can expediently be damped by means of a stabiliser with the transfer function Hstab(s) between the tower velocities, .DELTA.Z , and the blade angle, .DELTA..beta., which is such that the loop transfer function H-.beta.-.DELTA.Z-dot {j.omega.eig ) Hstab (j.omega.eig ) = - b , which means that: (I) where "b" is a variable depending on the moment and thrust characteristics of the turbine blades.

L'invention concerne un procédé utilisé dans une installation d'éolienne pour amortir les vibrations de la tour, en particulier une installation d'éolienne flottante comprenant une cellule flottante, une tour disposée sur la cellule flottante, un générateur monté sur la tour pouvant effectuer un mouvement de rotation par rapport à la direction du vent et équipé d'une éolienne, et un dispositif d'ancrage connecté aux éléments d'ancrage ou fondations au fond de la mer. Les vibrations propres de la tour, ?eig, sont amorties et réglées par le dispositif de commande de la puissance constante ou vitesse RPM de l'éolienne, un incrément ?ß étant ajouté à l'angle de pale des pales de la turbine en fonction des vitesses ?Z, de manière à amortir les vibrations propres. Les vibrations ß présentant une fréquence ?eig peuvent être amorties de manière adaptée au moyen d'un élément de stabilisation avec la fonction de transfert Hstab(s) entre les vitesses ?Z de la tour et l'angle de pale ?ß, de manière que la fonction de transfert de boucle H-ß-?Z-dot {j?eig ) Hstab (j?eig ) = -b, (I) "b" étant une variable dépendant des caractéristiques de moment et de traction des pales de la turbine.

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