A floating wind turbine foundation

Abstract

The present invention provides a floating wind turbine foundation, belonging to the field of offshore wind power technology, comprising a wind turbine, a column, a buoy, a truss assembly, and a mooring system. The wind turbine is fixedly connected to the top of the column. The buoys are multiple and evenly distributed around the column. The buoys are equipped with active ballast tanks for adjusting the ballast water volume of the buoys. The truss assembly is located below the sea surface and connects the buoys and the columns. The mooring system adopts catenary mooring and includes multiple mooring cables. The bottom end of each mooring cable is provided with an anchor foundation, and the anchor foundation is fixedly connected to the seabed. The floating wind turbine foundation of the present application can reduce costs, improve the movement performance of the wind turbine, and is suitable for deep sea areas.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to a floating wind turbine foundation. Background Art

[0002] Floating wind power is an innovative form of wind energy utilization. Floating wind turbines are mounted on a platform with a defined displacement volume and anchored to the seabed by a mooring system. The highly dynamic floating turbine foundation maintains minimal movement amplitude and frequency under the influence of waves and wind, minimizing impacts on turbine operation and improving power generation efficiency and reliability.

[0003] In existing technologies, single-column wind turbine foundations are susceptible to vortex-induced vibrations caused by periodic wave loads in seawater. Semi-submersible floating wind turbine foundations are susceptible to even greater wave loads when tilted. Barge-type floating wind turbine foundations are not yet adaptable to harsh sea conditions. Tension-leg floating wind turbine foundations have poor self-stability and require higher seabed geological conditions. Therefore, as floating wind turbine foundations expand into deep waters, they face an urgent need to reduce development costs and improve performance. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a floating wind turbine foundation, which can reduce costs, improve the movement performance of the wind turbine, and is suitable for deep sea areas.

[0005] The present invention provides the following technical solutions: a floating wind turbine foundation, comprising: a wind turbine, a column, a buoy, a truss assembly, and a mooring system;

[0006] The bottom of the column is used to be fixedly connected to the seabed, and the wind turbine is fixedly connected to the top of the column;

[0007] There are multiple buoys, which are evenly distributed around the columns. Active ballast tanks are provided in the buoys for adjusting the ballast water volume of the buoys.

[0008] The truss assembly is arranged around the outer periphery of the column, and the buoy is connected to the column through the truss assembly;

[0009] The mooring system includes a plurality of mooring cables, the bottom ends of the mooring cables are provided with anchor foundations for fixedly connecting to the seabed, the top ends of the plurality of mooring cables are respectively connected to one of the buoys or the columns. When viewed from above the floating wind turbine foundation, the plurality of mooring cables are unevenly distributed around the periphery of the columns, and at least one mooring cable is connected to each of the buoys, and at least one mooring cable is connected to the columns.

[0010] Preferably, the truss assembly includes: the truss assembly includes: at least two groups of cross bar assemblies and multiple support rods, each group of the cross bar assemblies is arranged in sequence from top to bottom, and the cross bar assembly includes multiple first cross bars connecting two adjacent pontoons in sequence and second cross bars connected between the columns and each of the pontoons, the second cross bars extend radially along the columns, and the support rods are connected between the upper and lower adjacent two first cross bars and between the upper and lower adjacent two second cross bars.

[0011] Preferably, at least one support rod is connected between two upper and lower adjacent first cross rods and between two upper and lower adjacent second cross rods, wherein some of the support rods extend vertically and the rest of the support rods extend obliquely.

[0012] Preferably, the wind turbine comprises a cone, a tower, a nacelle and blades;

[0013] The bottom end of the cone is fixedly connected to the top of the column, the bottom end of the tower is fixedly connected to the top of the cone, the cabin is fixedly connected to the top of the tower, the blades are rotatably connected to the driving end of the cabin, and the diameter of the column is larger than the diameter of the tower.

[0014] Preferably, the number of the pontoons is four. When viewed from above the floating wind turbine foundation, the pontoons and the first crossbar form a regular quadrilateral structure. The column is located at the center of the regular quadrilateral structure, and the windward orientation of the blades is located on the diagonal of the regular quadrilateral structure.

[0015] Preferably, the buoy on the windward direction of the blade is defined as the first buoy. When viewed from above the floating wind turbine foundation, the other buoys are defined as the second buoy, the third buoy, and the fourth buoy in a clockwise direction, starting from the first buoy. The first mooring cable is connected to the first buoy, the second mooring cable is connected to the second buoy, the third mooring cable and the fourth mooring cable are connected to the third buoy, the fifth mooring cable is connected to the fourth buoy, and the sixth mooring cable and the seventh mooring cable are connected to the column.

[0016] Preferably, when viewed from above the floating wind turbine foundation, the first mooring cable is within a range of 5° to 5° counterclockwise offset from the diagonal line of the first buoy, the second mooring cable is within a range of 10° to 20° clockwise offset from the diagonal line of the second buoy, the third mooring cable is within a range of 40° to 50° counterclockwise offset from the diagonal line of the third buoy, the fourth mooring cable is within a range of 40° to 50° clockwise offset from the diagonal line of the third buoy, the fifth mooring cable is within a range of 10° to 20° counterclockwise offset from the diagonal line of the fourth buoy, the sixth mooring cable is within a range of 10° to 20° clockwise offset from the diagonal line of the first buoy, and the seventh mooring cable is within a range of 10° to 20° counterclockwise offset from the diagonal line of the first buoy.

[0017] Preferably, when viewed from above the floating wind turbine foundation, the first mooring cable is on the diagonal line where the first buoy is located, the second mooring cable is at a position 15° clockwise offset from the diagonal line where the second buoy is located, the third mooring cable is at a position 45° counterclockwise offset from the diagonal line where the third buoy is located, the fourth mooring cable is at a position 45° clockwise offset from the diagonal line where the third buoy is located, the fifth mooring cable is at a position 15° counterclockwise offset from the diagonal line where the fourth buoy is located, the sixth mooring cable is at a position 15° clockwise offset from the diagonal line where the first buoy is located, and the seventh mooring cable is at a position 15° counterclockwise offset from the diagonal line where the first buoy is located.

[0018] Preferably, the column and the buoy are both columnar structures, the length of the column is greater than the length of the buoy, and the diameter of the column is greater than the diameter of the buoy.

[0019] Preferably, a heave plate is fixedly connected to the bottom of each buoy, and the cross-sectional area of ​​the heave plate is larger than the cross-sectional area of ​​the buoy.

[0020] The beneficial effects of the present invention are:

[0021] 1. While retaining the advantages of a single-column floating wind turbine foundation with a large draft and strong anti-overturning ability, the pontoon increases the waterline area of ​​the floating body, thereby providing a larger restoring torque when the floating body tilts. The truss structure between the column and the pontoon greatly enhances the stability of the structure, making it less susceptible to the adverse sea conditions in deep waters.

[0022] 2. The foundation structure of this floating wind turbine is simple, and each component can be constructed in a modular manner, which effectively reduces production costs and facilitates towing and assembly.

[0023] 3. The low center of gravity and large mass of the column make the center of gravity of the entire floating wind turbine foundation located below the center of buoyancy, which can meet the long-term safety requirements under harsh environmental conditions; the active ballast tank in the buoy dynamically adjusts the ballast water volume of different buoys to compensate for changes in wind speed and direction, appropriately adjust the wind turbine posture, enhance the stability of the wind turbine, and further improve the movement performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the floating wind turbine foundation of the present invention;

[0025] Figure 2 This is a schematic side structural diagram of the floating wind turbine foundation of the present invention;

[0026] Figure 3 This is a schematic diagram of the bottom structure of the floating wind turbine foundation of the present invention;

[0027] Figure 4 For the present invention Figure 1 Partial enlarged view;

[0028] Figure 5 Schematic diagram of the mooring system structure of the present invention.

[0029] In the picture:

[0030] 1. Wind turbine; 11. Cone; 12. Tower; 13. Nacelle; 14. Blades; 2. Column; 3. Buoy; 31. First buoy; 32. Second buoy; 33. Third buoy; 34. Fourth buoy; 35. Heave plate; 4. Truss assembly; 41. Crossbar assembly; 411. First crossbar; 412. Second crossbar; 42. Support rod; 5. Mooring system; 51. Mooring line; 511. First mooring line; 512. Second mooring line; 513. Third mooring line; 514. Fourth mooring line; 515. Fifth mooring line; 516. Sixth mooring line; 517. Seventh mooring line. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, replaceable connections, or integral connections. They can also refer to mechanical connections or electrical connections. They can also refer to direct connections or indirect connections through an intermediate medium. They can also refer to internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0034] Combine Figure 1-5 As shown, a floating wind turbine foundation includes: a wind turbine 1, a column 2, a buoy 3, a truss assembly 4, and a mooring system 5; the bottom of the column 2 is used to be fixedly connected to the seabed, and the wind turbine 1 is fixedly connected to the top of the column 2; the number of the buoys 3 is multiple and evenly distributed around the column 2, and the buoys 3 are provided with active ballast tanks for adjusting the ballast water volume of the buoys 3; the truss assembly 4 is arranged around the outer periphery of the column 2, and the buoys 3 are connected to the truss assembly 4 through the truss assembly 4. The mooring system 5 comprises a plurality of mooring cables 51, the bottom ends of the mooring cables 51 are provided with anchoring foundations for being fixedly connected to the seabed, the top ends of the plurality of mooring cables 51 are respectively connected to one of the buoys 3 or the columns 2, and when viewed from above the floating wind turbine foundation, the plurality of mooring cables 51 are unevenly distributed on the periphery of the columns 2, and at least one mooring cable 51 is connected to each of the buoys 3, and at least one mooring cable 51 is connected to the columns 2.

[0035] The floating wind turbine foundation of the present application has a simple structure. Its components, including the wind turbine 1, columns 2, pontoons 3, truss assembly 4, and mooring system 5, can be modularly constructed, effectively reducing production costs and facilitating transport and assembly. The kinematic performance of a floating wind turbine foundation is affected by wave conditions and water depth. The mass of the columns 2 is greater than that of the pontoons 3, and the wind turbine 1 is mounted above the columns 2, placing the center of gravity of the entire floating wind turbine foundation well below the center of buoyancy. This allows the foundation to retain the superior anti-overturning capability of a single-column floating wind turbine foundation. The arrangement of multiple pontoons 3 around the columns 2 increases the waterplane area of ​​the floating wind turbine foundation, providing a greater restoring torque when the columns 2 tilt, acting as a shock absorber and reducing roll and pitch of the floating wind turbine foundation. Multiple pontoons 3 also provide more compartment volume for ballast water and other auxiliary equipment. For example, active ballast tanks can dynamically adjust the ballast water volume of different pontoons 3 to compensate for changes in wind speed and direction, appropriately adjusting the attitude of the wind turbine 1 and further improving its stability. Therefore, the floating wind turbine foundation of the present application can adapt to deep sea areas and has high movement performance.

[0036] The truss assembly 4 rigidly connects the columns 2 and buoys 3, making the floating wind turbine foundation more stable. The truss assembly 4 is positioned below the buoys 3 and below the waterline. In strong winds and waves, this prevents damage to vessels docked beside the buoys 3 from the floating wind turbine foundation, thereby reducing the cost of operating and maintaining the floating wind turbine foundation. Because both the columns 2 and buoys 3 are floating structures, they are both connected to an anchor foundation on the seabed via mooring cables 51. This maintains the stability of the floating wind turbine foundation, avoids the adverse effects of pitching caused by multiple mooring cables 51 connected to the columns 2, and further improves its performance.

[0037] In some embodiments, the truss assembly 4 includes: at least two groups of crossbar assemblies 41 and a plurality of support rods 42. Each group of crossbar assemblies 41 is sequentially spaced from top to bottom, and the crossbar assemblies 41 include a plurality of first crossbars 411 sequentially connecting two adjacent buoys 3, and second crossbars 412 connected between the columns 2 and each buoy 3. The second crossbars 412 extend radially along the columns 2. The support rods 42 are connected between two adjacent first crossbars 411 and between two adjacent second crossbars 412. This facilitates the buoys 3 to work together to resist adverse sea conditions, enhance the stability of the floating wind turbine foundation, and improve its movement performance.

[0038] In some embodiments, at least one support rod 42 is connected between two adjacent first cross bars 411 and between two adjacent second cross bars 412, wherein some of the support rods 42 extend vertically and the rest extend obliquely.

[0039] For example, the vertically extending support rod 42 is defined as a vertical support, and the obliquely extending support rod 42 is defined as an oblique support. An oblique support is connected between two upper and lower adjacent second cross bars 412, wherein the lower end of the oblique support is fixedly connected to the outer periphery of the pontoon 3, and the higher end of the oblique support is fixedly connected to the outer periphery of the column 2, so that the truss assembly 4 between each pontoon 3 and the column 2 forms two triangular structures, which enhances the stability of the connection between the pontoon 3 and the column 2. A vertical support and two oblique supports are connected between two upper and lower adjacent first cross bars 411, wherein the two ends of the vertical support are respectively fixedly connected to the two upper and lower adjacent first cross bars 411, and the oblique support is located on both sides of the vertical support, and the two ends of the oblique support are respectively fixedly connected to the two upper and lower adjacent first cross bars 411, and the lower end of the oblique support is fixedly connected to the outer periphery of the pontoon 3, and the higher end of the oblique support is fixedly connected to the outer side of the vertical support. Since the distance between buoys 3 is relatively large, the vertical supports during connection can enhance the stability and fatigue damage resistance of the truss assembly 4 structure. The two oblique supports and the first cross bar 411 below form an isosceles triangle structure. The various forms of supports are interconnected and organically combined, making the floating wind turbine foundation less susceptible to damage due to severe sea conditions and suitable for deep sea areas.

[0040] In some embodiments, the wind turbine 1 includes a truncated cone 11, a tower 12, a nacelle 13, and blades 14. The bottom end of the truncated cone 11 is fixedly connected to the top end of the column 2, the bottom end of the tower 12 is fixedly connected to the top end of the truncated cone 11, the nacelle 13 is fixedly connected to the top end of the tower 12, and the blades 14 are rotatably connected to the drive end of the nacelle 13. The diameter of the column 2 is larger than the diameter of the tower 12. This helps ensure that the wind turbine 1 is stably connected above the tower 12, and facilitates setting the center of gravity of the floating wind turbine foundation below the center of buoyancy, retaining the advantages of a single-column floating wind turbine foundation.

[0041] In some embodiments, the number of pontoons 3 is four. When viewed from above, the pontoons 3 and the first crossbars 411 together form a regular quadrilateral structure. The columns 2 are located at the center of the regular quadrilateral structure, and the windward orientation of the blades 14 is located on a diagonal of the regular quadrilateral structure. When the wind turbine 1 is tilted by wind loads, the center of gravity of the floating wind turbine foundation is further away from the bottom fulcrum. The gravity of the wind turbine 1 body can provide a greater restoring torque to reset the wind turbine 1, thereby improving the anti-overturning capability of the floating wind turbine foundation.

[0042] In some embodiments, the buoy 3 on the windward side of the blade 14 is defined as a first buoy 31. When viewed from above the floating wind turbine foundation, starting from the first buoy 31, the other buoys 3 are defined as a second buoy 32, a third buoy 33, and a fourth buoy 34 in a clockwise direction. The first buoy 31 is connected to a first mooring cable 511, the second buoy 32 is connected to a second mooring cable 512, the third buoy 33 is connected to a third mooring cable 513 and a fourth mooring cable 514, the fourth buoy 34 is connected to a fifth mooring cable 515, and the column 2 is connected to a sixth mooring cable 516 and a seventh mooring cable 517. For example, the mooring cable 51 is connected to the buoy 3 or the column 2 through a shackle. The mooring cable 51 connected to the buoy 3 is connected to the fairlead hole at the center of the bottom of the buoy 3, and the mooring cable 51 connected to the column 2 is connected to the top of the column 2, thereby maintaining the stability of the floating wind turbine foundation, avoiding the adverse effect of bow swing caused by multiple mooring cables 51 being connected to the column 2, and further improving the movement performance.

[0043] In some embodiments, when viewed from above the floating wind turbine foundation, the first mooring line 511 is within a range of 5° to 5° counterclockwise offset from the diagonal line where the first buoy 31 is located, the second mooring line 512 is within a range of 10° to 20° clockwise offset from the diagonal line where the second buoy 32 is located, the third mooring line 513 is within a range of 40° to 50° counterclockwise offset from the diagonal line where the third buoy 33 is located, and the fourth mooring line 514 is within a range of 10° to 20° counterclockwise offset from the diagonal line where the third buoy 33 is located, The third buoy 33 is within the range of 40° to 50° clockwise offset from the diagonal line where the third buoy 33 is located, the fifth mooring line 515 is within the range of 10° to 20° counterclockwise offset from the diagonal line where the fourth buoy 34 is located, the sixth mooring line 516 is within the range of 10° to 20° clockwise offset from the diagonal line where the first buoy 31 is located, and the seventh mooring line 517 is within the range of 10° to 20° counterclockwise offset from the diagonal line where the first buoy 31 is located.

[0044] Compared with the working water depth, the floating wind turbine foundation of this embodiment is closer to the traditional semi-submersible floating wind turbine foundation. The mooring radius of the seven-point mooring scheme proposed in this embodiment is smaller than that of the traditional semi-submersible floating wind turbine foundation, which reduces the material usage of a single mooring cable 51 and can effectively reduce the construction and installation cost of the mooring system 5.

[0045] like Figure 5As shown, in some embodiments, when viewed from above the floating wind turbine foundation, the first mooring cable 511 is on the diagonal line of the first buoy 31, the second mooring cable 512 is at a position 15° clockwise offset from the diagonal line of the second buoy 32, the third mooring cable 513 is at a position 45° counterclockwise offset from the diagonal line of the third buoy 33, the fourth mooring cable 514 is at a position 45° clockwise offset from the diagonal line of the third buoy 33, the fifth mooring cable 515 is at a position 15° counterclockwise offset from the diagonal line of the fourth buoy 34, the sixth mooring cable 516 is at a position 15° clockwise offset from the diagonal line of the first buoy 31, and the seventh mooring cable 517 is at a position 15° counterclockwise offset from the diagonal line of the first buoy 31.

[0046] Under 0° wind and wave inflow conditions, this mooring system 5 layout was developed by the inventors after numerous tests and inspections. Compared to traditional Spar-type wind turbine foundations and semi-submersible floating wind turbine foundations, the floating wind turbine foundation of this application maintains a lower pitch response, facilitating excellent hydrodynamic performance. Furthermore, compared to the mooring system 5 of a traditional Spar-type wind turbine foundation, the floating wind turbine foundation of this application significantly reduces draft and mooring radius, optimizing both the installation cost of the floating wind turbine foundation and the cost of a single mooring line 51. Furthermore, the smaller mooring radius allows for the installation of more floating wind turbines 1 per unit sea area, improving energy output efficiency.

[0047] In some embodiments, the columns 2 and the buoys 3 are both columnar structures, the length of the columns 2 is greater than the length of the buoys 3, and the diameter of the columns 2 is greater than the diameter of the buoys 3. This ensures that the center of gravity of the entire floating wind turbine foundation is below the center of buoyancy, thereby enhancing anti-overturning capability.

[0048] In some embodiments, a heave plate 35 is fixedly connected to the bottom of each buoy 3, and the cross-sectional area of ​​the heave plate 35 is larger than the cross-sectional area of ​​the buoy 3. Exemplarily, the heave plate 35 is hexagonal or circular, and is used to significantly reduce the heave response of the floating wind turbine foundation.

[0049] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to practice the present application, including making and using any device or system, employing suitable materials, and using any combined methods. The scope of the present application is defined by the claimed technical solution and includes other examples that occur to those skilled in the art. As long as such other examples include structural elements that are not different from the literal language of the claimed technical solution, or such other examples include equivalent structural elements that are not substantially different from the literal language of the claimed technical solution, such other examples should be deemed to be within the scope of protection determined by the claimed technical solution.

Claims

1. A floating wind turbine foundation, characterized in that: include: Wind turbines, columns, buoys, truss components, mooring systems; The bottom of the column is used to be fixedly connected to the seabed, and the wind turbine is fixedly connected to the top of the column; There are multiple buoys, which are evenly distributed around the columns. Active ballast tanks are provided in the buoys for adjusting the ballast water volume of the buoys. The truss assembly is arranged around the outer periphery of the column, and the buoy is connected to the column through the truss assembly; The mooring system includes a plurality of mooring cables, wherein the bottom ends of the mooring cables are provided with anchor foundations for being fixedly connected to the seabed, and the top ends of the plurality of mooring cables are respectively connected to one of the buoys or the columns. When viewed from above the floating wind turbine foundation, the plurality of mooring cables are unevenly distributed around the periphery of the columns, and at least one mooring cable is connected to each buoy, and at least one mooring cable is connected to each column. The truss assembly includes: at least two groups of crossbar assemblies and a plurality of support rods, each group of crossbar assemblies is sequentially spaced from top to bottom, and the crossbar assembly includes a plurality of first crossbars sequentially connecting two adjacent buoys and second crossbars connected between the columns and each buoy, the second crossbars extending radially along the columns, and the support rods are connected between two adjacent first crossbars and between two adjacent second crossbars; The wind turbine includes blades, the number of the pontoons is four, and when viewed from above the floating wind turbine foundation, the pontoons and the first crossbars enclose a regular quadrilateral structure, the upright column is located at the center of the regular quadrilateral structure, and the windward orientation of the blades is located on a diagonal of the regular quadrilateral structure; The buoy on the windward side of the blade is defined as the first buoy. When viewed from above the floating wind turbine foundation, starting from the first buoy, the other buoys are defined as the second buoy, the third buoy, and the fourth buoy in a clockwise direction. The first buoy is connected to a first mooring cable, the second buoy is connected to a second mooring cable, the third buoy is connected to a third mooring cable and a fourth mooring cable, the fourth buoy is connected to a fifth mooring cable, and the column is connected to a sixth mooring cable and a seventh mooring cable.

2. The floating wind turbine foundation according to claim 1, wherein: At least one support rod is connected between two upper and lower adjacent first cross rods and between two upper and lower adjacent second cross rods, wherein some of the support rods extend vertically and the rest of the support rods extend obliquely.

3. The floating wind turbine foundation according to claim 2, characterized in that: The wind turbine includes a round platform, a tower, and a nacelle; The bottom end of the cone is fixedly connected to the top of the column, the bottom end of the tower is fixedly connected to the top of the cone, the cabin is fixedly connected to the top of the tower, the blades are rotatably connected to the driving end of the cabin, and the diameter of the column is larger than the diameter of the tower.

4. The floating wind turbine foundation according to claim 1, wherein: When viewed from above the floating wind turbine foundation, the first mooring cable is within a range of 5° to 5° counterclockwise offset from the diagonal line of the first buoy, the second mooring cable is within a range of 10° to 20° clockwise offset from the diagonal line of the second buoy, the third mooring cable is within a range of 40° to 50° counterclockwise offset from the diagonal line of the third buoy, the fourth mooring cable is within a range of 40° to 50° clockwise offset from the diagonal line of the third buoy, the fifth mooring cable is within a range of 10° to 20° counterclockwise offset from the diagonal line of the fourth buoy, the sixth mooring cable is within a range of 10° to 20° clockwise offset from the diagonal line of the first buoy, and the seventh mooring cable is within a range of 10° to 20° counterclockwise offset from the diagonal line of the first buoy.

5. The floating wind turbine foundation according to claim 4, characterized in that: When viewed from above the floating wind turbine foundation, the first mooring cable is on the diagonal line where the first buoy is located, the second mooring cable is at a position 15° clockwise offset from the diagonal line where the second buoy is located, the third mooring cable is at a position 45° counterclockwise offset from the diagonal line where the third buoy is located, the fourth mooring cable is at a position 45° clockwise offset from the diagonal line where the third buoy is located, the fifth mooring cable is at a position 15° counterclockwise offset from the diagonal line where the fourth buoy is located, the sixth mooring cable is at a position 15° clockwise offset from the diagonal line where the first buoy is located, and the seventh mooring cable is at a position 15° counterclockwise offset from the diagonal line where the first buoy is located.

6. The floating wind turbine foundation according to claim 1, wherein: The column and the buoy are both columnar structures, the length of the column is greater than the length of the buoy, and the diameter of the column is greater than the diameter of the buoy.

7. The floating wind turbine foundation according to claim 1, wherein: The bottom of each buoy is fixedly connected with a heave plate, and the cross-sectional area of ​​the heave plate is larger than the cross-sectional area of ​​the buoy.

Images