Floating fan foundation

Abstract

The invention provides a floating type draught fan foundation, and belongs to the technical field of offshore wind power, the floating type draught fan foundation comprises a draught fan, a stand column, a plurality of buoys, a truss assembly and a mooring system, the draught fan is fixedly connected to the top end of the stand column, and the buoys are evenly distributed on the periphery of the stand column; an active ballast tank used for adjusting the ballast water amount of the buoy is arranged in the buoy, the truss assembly is located below the sea surface, the truss assembly is connected with the buoy and the stand column, the mooring system adopts catenary mooring and comprises a plurality of mooring cables, an anchoring foundation is arranged at the bottom end of each mooring cable, and the mooring cables are connected with the truss assembly. The anchoring foundation is fixedly connected to the seabed. The floating type draught fan foundation can reduce cost and improve the motion performance of a draught fan, and is suitable for deep and far 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 installed on a carrier platform with a certain displacement volume and are connected to the seabed by an anchoring system for positioning. The high-performance floating wind turbine foundation can still maintain a small movement amplitude and frequency under the action of waves and wind, reducing the impact on wind turbine operation, thereby improving power generation efficiency and reliability.

[0003] In the existing technology, the single-column wind turbine foundation is susceptible to vortex-induced vibration caused by the periodic load of waves in seawater, the semi-submersible floating wind turbine foundation is susceptible to greater wave loads when tilted, the barge floating wind turbine foundation is still insufficient in adaptability to severe sea conditions, and the tension leg floating wind turbine foundation has poor self-stability and has higher requirements for the geological conditions of the seabed. Therefore, the wind turbine foundation of floating wind power is facing an urgent need to reduce development costs and improve movement performance in the process of moving to deep sea areas. 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] The number of the buoys is multiple and evenly distributed around the column, and the buoys are provided with active ballast tanks for adjusting the ballast water volume of the buoys;

[0008] The truss assembly is arranged around the outer circumference 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 fixed connection to the seabed, the top ends of the plurality of mooring cables are respectively connected to one of the buoys or the columns, and when viewed from above the floating wind turbine foundation, the plurality of mooring cables are unevenly distributed on 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 column.

[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 two adjacent first cross bars above and below and between two adjacent second cross bars above and below.

[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 truncated cone, a tower, a nacelle and blades;

[0013] The bottom end of the cone is fixedly connected to the top end of the column, the bottom end of the tower is fixedly connected to the top end of the cone, the cabin is fixedly connected to the top end 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, and when viewed from above the floating wind turbine foundation, the pontoons and the first cross bar enclose 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, and observed in the top-down direction of the floating wind turbine foundation, taking the first buoy as the starting point, 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 the first mooring cable, the second buoy is connected to the second mooring cable, the third buoy is connected to the third mooring cable and the fourth mooring cable, the fourth buoy is connected to the fifth mooring cable, and the column is connected to the sixth mooring cable and the seventh mooring cable.

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

[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. It not only retains the advantages of the single-column floating wind turbine foundation, such as large draft depth and strong anti-overturning ability, but also increases the waterline area of ​​the floating body through the pontoon, thereby providing a larger restoring moment when the floating body tilts. The truss structure between the column and the pontoon greatly enhances the stability of the structure and is not easily affected by the harsh sea conditions in deep sea areas.

[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 the production cost and facilitates towing and assembly.

[0023] 3. The column has a low center of gravity and a large mass, so that the center of gravity of the entire floating wind turbine foundation is 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 wind direction, appropriately adjusts the wind turbine posture, enhances the stability of the wind turbine, and further improves the movement performance. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 3 It 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 magnification;

[0028] Figure 5 It is a schematic diagram of the structure of the mooring system of the present invention.

[0029] In the figure:

[0030] 1. Wind turbine; 11. Cone; 12. Tower; 13. Nacelle; 14. Blade; 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 cable; 511. First mooring cable; 512. Second mooring cable; 513. Third mooring cable; 514. Fourth mooring cable; 515. Fifth mooring cable; 516. Sixth mooring cable; 517. Seventh mooring cable. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which 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 operated in a specific orientation, and therefore cannot 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 cannot 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 clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0034] Combination Figure 1-5 As shown, a floating wind turbine foundation comprises: 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 buoy 3 is 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 anchor 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. Each component such as the wind turbine 1, the column 2, the buoy 3, the truss assembly 4, the mooring system 5, etc. can be modularly constructed, effectively reducing the production cost and facilitating towing and assembly. The motion performance of the floating wind turbine foundation is affected by wave conditions and water depth. The mass of the column 2 is greater than that of the buoy 3, and the wind turbine 1 is installed above the column 2, so that the center of gravity of the entire floating wind turbine foundation is much lower than the center of buoyancy, so that the advantage of the single-column floating wind turbine foundation with strong anti-overturning ability can be retained. The arrangement of multiple buoys 3 around the column 2 increases the waterline area of ​​the floating wind turbine foundation, thereby providing a greater restoring torque when the column 2 is tilted, playing a shock-absorbing role, and reducing the rolling and pitching of the floating wind turbine foundation. Multiple buoys 3 can also provide more cabin volume for storing ballast water and other auxiliary equipment. For example, the active ballast tank can compensate for changes in wind speed and wind direction by dynamically adjusting the ballast water volume of different buoys 3, appropriately adjusting the posture of the wind turbine 1, and further improving the stability of the wind turbine 1. Therefore, the floating wind turbine foundation of the present application can adapt to deep sea areas and has high movement performance.

[0036] The column 2 and the buoy 3 are rigidly connected by the truss assembly 4, so that the floating wind turbine foundation is more stable. The truss assembly 4 is arranged below the buoy 3 and is located below the waterline. In the case of strong winds and waves, the ship docked on the side of the buoy 3 can be prevented from being damaged by the floating wind turbine foundation, thereby reducing the cost of operating and maintaining the floating wind turbine foundation. Since the column 2 and the buoy 3 are both floating bodies, the column 2 and the buoy 3 are connected to the anchor foundation fixed to the seabed by the mooring cable 51, maintaining the stability of the floating wind turbine foundation, avoiding the adverse effect of the bow swing caused by multiple mooring cables 51 connected to the column 2, and further improving the movement performance.

[0037] In some embodiments, the truss assembly 4 includes: the truss assembly 4 includes: at least two groups of crossbar assemblies 41 and a plurality of support rods 42, each group of the crossbar assemblies 41 is arranged in sequence from top to bottom, and the crossbar assembly 41 includes a plurality of first crossbars 411 sequentially connecting two adjacent buoys 3 and a second crossbar 412 connected between the column 2 and each buoy 3, the second crossbar 412 extends along the radial direction of the column 2, and the support rods 42 are connected between the upper and lower adjacent two first crossbars 411 and between the upper and lower adjacent two second crossbars 412. It is beneficial for the buoys 3 to work together to resist severe sea conditions, enhance the stability of the floating wind turbine foundation, and improve the movement performance.

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

[0039] Exemplarily, 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 buoy 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 buoy 3 and the column 2 forms two triangular structures, which enhances the stability of the connection between the buoy 3 and the column 2. A vertical support and two oblique supports are connected between two upper and lower adjacent first cross bars 411, and 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 buoy 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 stability and fatigue damage resistance of the truss assembly 4 structure can be enhanced through vertical supports during connection. 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, so that the floating wind turbine foundation is not easily damaged by severe sea conditions and is 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 of the column 2, the bottom end of the tower 12 is fixedly connected to the top of the truncated cone 11, the nacelle 13 is fixedly connected to the top of the tower 12, the blades 14 are rotatably connected to the driving end of the nacelle 13, and the diameter of the column 2 is greater than the diameter of the tower 12. This is conducive to ensuring that the wind turbine 1 is stably connected above the tower 12, and is conducive to setting the center of gravity of the floating wind turbine foundation below the buoyancy center, retaining the advantages of the single-column floating wind turbine foundation.

[0041] In some embodiments, the number of the pontoons 3 is four, and when viewed from the top of the floating wind turbine foundation, the pontoons 3 and the first crossbar 411 enclose a regular quadrilateral structure, the column 2 is located at the center of the regular quadrilateral structure, and the windward orientation of the blades 14 is located on the diagonal of the regular quadrilateral structure. When the wind turbine 1 is tilted by wind load, the distance between the center of gravity of the floating wind turbine foundation and the bottom fulcrum will be farther, and the body weight of the wind turbine 1 can provide a larger restoring torque to reset the wind turbine 1, thereby improving the anti-overturning ability of the floating wind turbine foundation.

[0042] In some embodiments, the buoy 3 on the windward direction of the blade 14 is defined as a first buoy 31. When viewed from above the floating wind turbine foundation, the other buoys 3 are defined as a second buoy 32, a third buoy 33, and a fourth buoy 34 in a clockwise direction, with the first buoy 31 as the starting point. 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. Exemplarily, 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 cable 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 cable 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 cable 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 cable 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 cable 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 cable 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 cable 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 the top direction of the floating wind turbine foundation, the first mooring cable 511 is on the diagonal line where the first buoy 31 is located, the second mooring cable 512 is at a position 15° offset clockwise from the diagonal line where the second buoy 32 is located, the third mooring cable 513 is at a position 45° offset counterclockwise from the diagonal line where the third buoy 33 is located, the fourth mooring cable 514 is at a position 45° offset clockwise from the diagonal line where the third buoy 33 is located, the fifth mooring cable 515 is at a position 15° offset counterclockwise from the diagonal line where the fourth buoy 34 is located, the sixth mooring cable 516 is at a position 15° offset clockwise from the diagonal line where the first buoy 31 is located, and the seventh mooring cable 517 is at a position 15° offset counterclockwise from the diagonal line where the first buoy 31 is located.

[0046] Under the condition of 0° wind and wave inflow, the mooring system 5 is arranged in this way after multiple tests and inspections by the inventors. Compared with the traditional Spar-type wind turbine foundation and the semi-submersible floating wind turbine foundation, the floating wind turbine foundation of the present application maintains a lower pitch response, which is conducive to achieving good hydrodynamic performance. Compared with the mooring system 5 of the traditional Spar-type wind turbine foundation, the floating wind turbine foundation of the present application greatly reduces the draft and mooring radius, optimizes the installation cost of the floating wind turbine foundation and the cost of a single mooring cable 51, and the smaller mooring radius can promote the installation of more floating wind turbines 1 equipment per unit sea area, thereby improving energy output efficiency.

[0047] In some embodiments, the column 2 and the buoy 3 are both columnar structures, the length of the column 2 is greater than the length of the buoy 3, and the diameter of the column 2 is greater than the diameter of the buoy 3. Ensure that the center of gravity of the entire floating wind turbine foundation is below the buoyancy center to enhance the anti-overturning ability.

[0048] In some embodiments, the bottom of each buoy 3 is fixedly connected with a heave plate 35, 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 implement the present application, including making and using any device or system, using suitable materials, and using any combined method. The scope of the present application is defined by the technical solution for protection, 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 technical solution for protection, or such other examples contain equivalent structural elements that are not substantially different from the literal language of the technical solution for protection, such other examples should be considered to be within the scope of protection determined by the technical solution for protection of the present application.

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; The number of the buoys is multiple and evenly distributed around the column, and the buoys are provided with active ballast tanks 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, the bottom ends of the mooring cables are provided with anchor foundations for fixed connection to the seabed, the top ends of the plurality of mooring cables are respectively connected to one of the buoys or the columns, and when viewed from above the floating wind turbine foundation, the plurality of mooring cables are unevenly distributed on 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 column.

2. The floating wind turbine foundation according to claim 1, characterized in that: 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 sequentially connecting two adjacent pontoons and second cross bars connected between the columns and each pontoon, the second cross bars extend radially along the columns, and the support rods are connected between two adjacent first cross bars above and below and between two adjacent second cross bars above and below.

3. The floating wind turbine foundation according to claim 2, characterized in that: 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.

4. The floating wind turbine foundation according to claim 3, characterized in that: The wind turbine comprises a truncated cone, a tower, a nacelle and blades; The bottom end of the cone is fixedly connected to the top end of the column, the bottom end of the tower is fixedly connected to the top end of the cone, the cabin is fixedly connected to the top end 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.

5. The floating wind turbine foundation according to claim 4, characterized in that: The number of the pontoons is four. When viewed from above the floating wind turbine foundation, the pontoons and the first crossbars enclose a regular quadrilateral structure. The columns are 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.

6. The floating wind turbine foundation according to claim 5, characterized in that: The buoy on the windward direction of the blade is defined as the first buoy. When observed from the top view direction of 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 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.

7. The floating wind turbine foundation according to claim 6, characterized in that: When viewed from above the floating wind turbine foundation, the first mooring cable is within the range of 5° to 5° counterclockwise offset from the diagonal line where the first buoy is located, the second mooring cable is within the range of 10° to 20° clockwise offset from the diagonal line where the second buoy is located, the third mooring cable is within the range of 40° to 50° counterclockwise offset from the diagonal line where the third buoy is located, the fourth mooring cable is within the range of 40° to 50° clockwise offset from the diagonal line where the third buoy is located, the fifth mooring cable is within the range of 10° to 20° counterclockwise offset from the diagonal line where the fourth buoy is located, the sixth mooring cable is within the range of 10° to 20° clockwise offset from the diagonal line where the first buoy is located, and the seventh mooring cable is within the range of 10° to 20° counterclockwise offset from the diagonal line where the first buoy is located.

8. The floating wind turbine foundation according to claim 7, characterized in that: Observing from the top view of 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.

9. The floating wind turbine foundation according to claim 1, characterized in that: 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.

10. The floating wind turbine foundation according to claim 1, characterized in that: 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.

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