143 results about "Floating wind turbine" patented technology

The invention provides a method in connection with a wind turbine installation for damping tower vibrations, in particular, a floating wind turbine installation comprises: 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 FORMULA eig are damped by, in addition to control with the controller in the constant power or RPM range of the wind turbine, an increment, FORMULA, added to the blade angle of the turbine blades on the basis of the tower velocities, FORMULA Z , so that the eigenvibrations are counteracted. The vibrations in FORMULA that have frequency FORMULA eig can expediently be damped by means of a stabilizer with the transfer function Hstab(s) between, such that the loop transfer function FORMULA is obtained, which means that: (I) ''b'' is a variable depending on the moment and thrust characteristics of the turbine blades.

The invention discloses a floating offshore wind turbine movement suppression device and a floating base with the same. The floating offshore wind turbine movement suppression device comprises at least one annular anti-rolling plate which surrounds the floating base and is horizontally arranged. A plurality of anti-rolling fins are arranged on the anti-rolling plate, and comprise a first group of anti-rolling fins which are arranged on one side of the anti-rolling plate; and the first group of anti-rolling fins are vertically spaced from one another around the floating base. The floating offshore wind turbine movement suppression device can effectively suppress the movement of a floating wind turbine, is low in cost and has a wide application prospect.

The wind turbine 20 includes a wind driven turbine wheel 22 rotatable about a central axis 29 that has sail wings 30 that catch the wind and rotate the turbine wheel 22. An anchor 58 has its anchor line 56 attached to the turbine wheel at its axis of rotation 29 to prevent tilting the wind turbine in response to high wind conditions.

A floating wind turbine comprising a hull (1), a wind turbine (2) mounted on top of the hull (1) and a counterweight (3) suspended below the hull (1) by means of counterweight suspension means (18) isdescribed. Also a method for the installation is described. The counterweight (3) comprises one or more counterweight buoyancy tanks (17). When the internal volume of the buoyancy tanks (17) is filled with air, the total buoyancy of the counterweight (3) is close to or greater than its weight. Hereby it is capable of floating in a towing / maintenance position with moderate or no support in the vertical direction from the hull (1) or other vessels. During towing, the hull substantially has the character of a barge, substantially relying on a large waterplane area and shallow draft to maintainstability. When the buoyancy tanks (17) are partly or completely flooded with water, the counterweight (3) will sink to an installed position at a level determined by the counter- weight suspension means (18). In this position the counterweight acts as a keel, stabilizing the foundation. The counterweight suspension means (18) are separately or jointly capable of transfer- ring both forces and moments to the hull (1), thereby enabling the counterweight (3) to stabilize the hull (1) when the counterweight (3) is in its installed position.

The present invention relates to a blade pitch controller for a floating wind turbine structure, wherein the floating wind turbine structure comprises a support structure supporting a rotor having a plurality of blades. The controller comprises 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.