Statoilhydro Asa

Hywind As

Equinor Energy As

Bjorn Skaare

Finn Gunnar Nielsen

John Olav G Tande

Ian Norheim

Kjetil Uhlen

John Olav Tande

Emil Smilden

A controller for a floating wind turbine is adapted to cause the wind turbine to extract energy from wave-induced motion of the turbine. The controller controls the rotor speed of the turbine by controlling the torque of the load presented to the rotor such that the rotor speed varies in response to wave-induced motion.

Control method for a floating wind turbine

The present invention relates to a blade pitch controller for a floating wind turbine structure, wherein the floating wind turbine structure may include a support structure supporting a rotor having a number of blades. The controller may include standard blade pitch control means and active damping means. The standard blade pitch control means is arranged to control a blade pitch using a transfer function between a rotor speed error and the blade pitch. The active damping means is arranged to further control the blade pitch on the basis of a speed of a point on the wind turbine structure by converting the speed of a point on the wind turbine structure into a rotor speed error and using the same transfer function that is used in the standard blade pitch control means to convert the rotor speed error into a correction to the blade pitch.

Blade pitch control in a wind turbine installation

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.

Method for damping tower vibrations in a wind turbine installation

A method for controlling a wind turbine installation for the damping tower oscillations, in particular a buoyant wind turbine installation comprising a buoyant body, a tower arranged over the buoyant body, 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 oscillations are damped by the control with the blade angle controller in the constant power or RPM range of the wind turbine being performed by the rotor velocity (which is the input to the blade angle controller) being estimated in an estimator for the wind turbine. The input to the wind turbine estimator is the estimated incoming wind, so that the tower movements are not visible to the blade angle controller. Negative damping is thus not introduced into the system and the tower oscillations will be expediently damped, while there is also less variation in blade angle, thrust on the rotor and power supplied.

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Trondheim, Norway

Bjorn Skaare