| 摘要 |
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<SUB>eig</SUB>, are damped by, in addition to control with the controller in the constant power or RPM range of the wind turbine, an increment, Deltabeta, being added to the blade angle of the turbine blades on the basis of the tower velocities, DeltaZ, so that the eigenvibrations are counteracted. The vibrations in beta that have frequency omega<SUB>eig </SUB>can expediently be damped by means of a stabiliser with the transfer function H<SUB>stab</SUB>(s) between the tower velocities, DeltaZ, and the blade angle, Deltabeta, which is such that the loop transfer function H-<SUB>beta-DeltaZ-dot</SUB>{jomega<SUB>eig</SUB>)H<SUB>stab</SUB>(jomega<SUB>eig</SUB>)=-b, which means that: (I) where "b" is a variable depending on the moment and thrust characteristics of the turbine blades.
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