A floating body for an offshore wind turbine includes: one first column; two second columns; two lower hulls connecting the first column to each of the second columns; and a beam member connecting the two lower hulls. The beam member is disposed within a height range between an upper surface and a lower surface of each lower hull.

A wind rotor is disclosed that produces energy optimally for a given thrust overturning moment. By designing rotors with suboptimal aerodynamic efficiency, they can have optimal thrust performance, which will reduce the substructure cost and/or enable greater energy capture for a given substructure.

In an installation of a wind turbine on a floating foundation in floating condition and subject to sea-state induced motions, e.g. at the site of an offshore windfarm, use is made of a vessel with a crane arranged on the hull and provided with a hoisting system adapted to support the weight of the wind turbine and suspend the wind turbine from the crane. A heave compensation device compensates for sea-state induced heave motion of the wind turbine mast relative to the mast mounting structure of the floating foundation. Use is made of a mast alignment system configured to engage on the suspended wind turbine, e.g. on the mast of the suspended wind turbine, and to bring and maintain the mast of the wind turbine in alignment with the mounting axis of the floating foundation in order to compensate for sea-state induced motions, at least including tilt motions in one or more vertical planes, of the wind turbine mast relative to the mounting axis of the floating foundation.

A floatable concrete block structure is manufactured by fabricating individual concrete blocks on land, and then assembling and coupling the individual concrete blocks underwater or on a water surface. An assembly buoyancy chamber is formed inside by the first concrete block and the second concrete block, the inflow of water into the assembly buoyancy chamber is prevented by a first watertight packing, and so on, and the first concrete block and the second concrete block are coupled to each other by concrete columns.

A method of repositioning a floating offshore wind turbine located at a current offshore position and having rotor blades rotating in a rotor blade plane includes: measuring a first value of a variability of a load related to a first location at the wind turbine; measuring a second value of a variability of a load related to a second location at the wind turbine; comparing the first value with the second value; and moving the wind turbine along a direction depending on the comparison and in particular further depending on the first location relative to the second location.

A floating offshore structure of the present invention comprises: a plurality of columns; and a tower support column for supporting a tower of a power generation structure, wherein a polygonal shape is formed by means of an imaginary line connecting the columns, and the tower supporting column can be provided at one point of one of the sides of the polygonal shape.

Semi-submersible offshore support structure for a wind turbine comprising three semi-submersible columns that are connected to each other by a connection structure, wherein the connection structure defines three sides of the support structure, wherein the support structure further comprises a wind turbine receiving element for receiving a wind turbine tower, wherein the wind turbine receiving element is positioned on a side of the support structure between two semi-submersible columns.

A floating offshore structure of the present disclosure includes: a plurality of columns; and a plurality of pontoons installed at lower ends of the columns, respectively, wherein a polygonal shape is formed by an imaginary line connecting the columns, the pontoons are installed inside the polygonal shape, a cross-sectional area in a direction parallel to sea level of the pontoons is greater than or equal to the cross-sectional area in the direction parallel to the sea level of the columns, and the pontoons may have a shape protruding outward at the lower ends of the columns.

There provides an auxiliary structure for floating and sinking the whole offshore wind turbine with suction bucket foundation(s), which includes an upper bracket floated on water and a lower bracket sunk synchronously with a support structure. The upper bracket includes upper floating boxes; upper cross-connectors each of which is fixedly connected to the upper hoop and a corresponding upper floating box: and an upper hoop configured to sleeve on an outer side of the support structure. The upper bracket and the support structure are relatively moved in an up and down direction, and are connected in a manner of limiting position, to enable the upper bracket to right the support structure when being sunk. The lower bracket includes lower floating boxes, a bottom of each of which is adjustable in height, lower cross-connectors each of which is fixedly connected to the lower hoop and a corresponding lower floating box; and a lower hoop that holds the support structure tightly Compared with the prior art, the long-distance floating transport and deep-sea installation of the whole offshore wind turbine is realized based on the suction bucket foundations, which improves the construction safety and efficiency of the offshore wind turbine.

A wind turbine, having a floating foundation (1), a support structure (2) and a generator (3). The generator (3) is an up-wind generator. The floating foundation (1) is assembled from tubular steel sections (5, 6, 7, 8) of uniform diameter, forming a frame with a mooring turret (4) at one corner. The support structure (2) hays at least two beams (11, 12) extending substantially transverse to the floating foundation (1). The beams are connected at a first end to a respective opposite side of said foundation frame and at a second end to said nacelle (17). The support structure (2) and the floating foundation (1) form a triangle with the nacelle (17) fixedly mounted at the apex. The support structure (2) comprises tensioned backstays (13, 14, 15, 16) supporting the beams (11, 12) and ensuring that they are substantially subjected to compression forces only.