Statoilhydro Asa

Hywind as

Ian Norheim

Finn Gunnar Nielsen

Bjorn Skaare

John Olav G Tande

Kjetil Uhlen

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, &#x3c9;, are damped by, in addition to control with the controller in the constant power or RPM range of the wind turbine, an increment, &#x394;&#x3b2;, being added to the blade angle of the turbine blades on the basis of the tower velocities, &#x394;Z, so that the eigenvibrations are counteracted. The vibrations in &#x3b2; that have frequency &#x3c9;can expediently be damped by means of a stabiliser with the transfer function H(s) between the tower velocities, &#x394;Z, and the blade angle, &#x394;&#x3b2;, which is such that the loop transfer function H&#x2212;{j&#x3c9;)H(j&#x3c9;)=&#x2212;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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Biri, Norway

Ian Norheim