143 results about "Floating wind turbine" patented technology

A floating wind turbine platform includes a floatation frame that includes at least three columns that are coupled to each other with horizontal main beams. A wind turbine tower is mounted above a tower support column to simplify the system construction and improve the structural strength. The turbine blades are coupled to a nacelle that rotates on top of the tower. The turbine's gearbox generator and other electrical gear can be mounted either traditionally in the nacelle, or lower in the tower or in the top of the tower-supporting column. The floatation frame includes a water ballasting system that pumps water between the columns to keep the tower in a vertical alignment regardless of the wind speed. Water-entrapment plates are mounted to the bottoms of the columns to minimize the rotational movement of the floatation frame due to waves.

A floating wind turbine system with a tower structure that includes at least one stability arm extending therefrom and that is anchored to the sea floor with a rotatable position retention device that facilitates deep water installations. Variable buoyancy for the wind turbine system is provided by buoyancy chambers that are integral to the tower itself as well as the stability arm. Pumps are included for adjusting the buoyancy as an aid in system transport, installation, repair and removal. The wind turbine rotor is located downwind of the tower structure to allow the wind turbine to follow the wind direction without an active yaw drive system. The support tower and stability arm structure is designed to balance tension in the tether with buoyancy, gravity and wind forces in such a way that the top of the support tower leans downwind, providing a large clearance between the support tower and the rotor blade tips. This large clearance facilitates the use of articulated rotor hubs to reduced damaging structural dynamic loads. Major components of the turbine can be assembled at the shore and transported to an offshore installation site.

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 invention provides a semi-submersible type offshore floating wind turbine foundation, comprising three cylindrical buoys, a vertical post, a deck and a heave plate, wherein the three cylindrical buoys are arranged at equal intervals in a regular triangle manner; the vertical post is arranged in the center position of the regular triangle formed by the three buoys; the top flange of the vertical post is connected with a tower of a floating wind turbine; the top ends of the three buoys are connected with one another through the deck; the vertical post passes through the center of the deck; and the bottom ends of the three buoys are connected with the bottom end of the vertical post through the heave plate.

A semisubmersible wind turbine platform capable of floating on a body of water and supporting a wind turbine over a vertical center column includes a vertical center column and three or more vertical outer columns spaced radially from the center column, each of the outer columns being connected to the center column with one or more of bottom beams, top beams, and struts, with the major structural components being made of concrete and having sufficient buoyancy to support a wind turbine tower.

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.