Tension leg floating wind platform foundation suitable for large-scale wind farm development in deep sea

Abstract

The application discloses a tension leg floating wind power platform foundation suitable for large-scale wind field development in deep sea, and belongs to the technical field of ocean engineering, comprising a tower cylinder transition section, a central guide pipe rack, a Y-shaped buoy and a tension leg system; the tower cylinder transition section is located at the top of the platform foundation and is connected with the central guide pipe rack at the bottom; the central guide pipe rack is located at the center of the platform foundation and is supported on the Y-shaped buoy at the bottom; the tension leg system connects the Y-shaped buoy with a seabed anchoring foundation and is used for providing downward pre-tension to the platform foundation. The Y-shaped buoy at the bottom is arranged away from the sea surface, so that the direct action of wave load on the floating body is effectively reduced, the tension leg wind power platform foundation structure is simple, the steel consumption of the foundation is effectively reduced, the standardized segmented design and parallel prefabrication mode can be adopted, the construction process is greatly simplified, the overall cost of large-scale development of deep-sea floating wind power is further reduced, and the construction delivery efficiency is improved.

Description

Technical Field

[0001] This invention relates to a tension leg floating wind power platform foundation suitable for large-scale wind farm development in deep sea areas. It belongs to the field of marine engineering technology and specifically relates to a tension leg floating wind power platform foundation that prioritizes in-situ performance and adopts an integrated design of a top tower transition section, a central jacket, and a bottom Y-shaped pontoon. Background Technology

[0002] With near-shore and shallow-sea wind farm development becoming increasingly saturated, deep-sea floating wind power technology has become an important direction for the future development of offshore wind power. Deep-sea floating wind power development faces more complex marine environmental conditions and dynamic loads, as well as longer transmission distances, resulting in high development costs. Currently, it remains in the single-unit or small-scale demonstration stage and has not yet formed a mature large-scale commercial development model. Among existing floating wind power foundation types, tension leg (TLP) floating foundations connect the floating body to the seabed anchorage foundation through vertical or near-vertical tension legs. The buoyancy of the floating body is greater than its own weight, and the tension leg system provides vertical mooring tension to ensure platform stability. Compared with barge-type, semi-submersible, and monopole-type floating foundations, TLP floating foundations have better motion performance, which is beneficial to wind turbine operation and improves power generation efficiency. At the same time, relying on the tension leg system to provide stability reduces the requirements for the stability of the floating body itself, significantly reducing the amount of steel used in the floating body. In addition, the near-vertical tension leg system significantly reduces the required sea area compared to extended mooring systems, making it more suitable for multi-energy integration and other three-dimensional sea use scenarios.

[0003] The existing technology still has the following problems: 1. Conventional towed self-stabilizing TLPs require side floats or side columns, which consume a large amount of steel and have a complex structure; 2. The large-scale development of deep-sea floating wind power is costly, construction and installation are inefficient, and it is difficult to deliver in batches.

[0004] The aforementioned problems make it difficult to achieve a balance between economy and efficiency in the development of large-scale wind farms in deep-sea areas using TLP-type floating wind power foundations. There is an urgent need for a tension leg floating wind power platform foundation that is structurally simplified, efficient to construct, and easy to install. Summary of the Invention

[0005] This invention provides a tension leg floating wind power platform foundation suitable for large-scale wind farm development in deep-sea areas, in order to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The first aspect provides a technical solution: a tension leg floating wind power platform foundation suitable for large-scale wind farm development in deep and offshore areas, including a tower transition section, a central jacket, a Y-shaped pontoon, and a tension leg system; The tower transition section is located at the top of the platform foundation, with its top for docking with the wind turbine tower and its bottom connected to the central jacket. The central jacket is located at the center of the platform foundation, with its top supporting the tower transition section and its bottom supporting the Y-shaped pontoon. The Y-shaped pontoon is located at the bottom of the platform foundation and is used to provide the main buoyancy for the platform foundation; The tension leg system connects the Y-shaped pontoon to the seabed anchoring foundation and provides downward pretension to the platform foundation.

[0007] Furthermore, the Y-shaped pontoon includes a central pontoon and three cantilever pontoons. The central pontoon is located at the center of the Y-shaped pontoon and its horizontal cross-section is an equilateral triangle. The three cantilever pontoons extend outward from the corner ends of the central pontoon and are arranged symmetrically at 120-degree intervals along the circumferential direction.

[0008] Furthermore, the vertical cross-section of the three cantilevered pontoons is rectangular, with their inner ends docking with the central pontoon and their outer ends connected to the tension leg system. The interiors of the central pontoon and the cantilevered pontoons can be divided into ballast tanks or empty tanks.

[0009] Furthermore, the central guide frame includes three main legs and several support rods. The three main legs are arranged symmetrically along the circumferential direction, with circular cross-sections, and the center-to-center distance gradually decreases from the bottom to the top, forming an inclined arrangement. The three main legs are connected by several intersecting support rods with circular cross-sections to form a stable frame structure.

[0010] Furthermore, the tower transition section includes an operation and maintenance platform, a tower base, and a tower support structure. The operation and maintenance platform is located at the bottom of the tower transition section. The tower base is cylindrical, with its bottom located at the center of the operation and maintenance platform and its top used for docking with the wind turbine tower. The tower base is connected to the operation and maintenance platform through the tower support structure. The interior of the tower base is used for cable suspension and the arrangement of electrical and instrumentation equipment.

[0011] Furthermore, the tension leg system includes three sets of tension tendons. The upper ends of the three sets of tension tendons are respectively connected to the ends of the three cantilevered pontoons of the Y-shaped pontoon, and the lower ends are connected to the seabed anchoring foundation. Each set of tension tendons includes several tension tendons, arranged vertically or with a moderately outward expansion at the bottom. The tension tendons are made of steel cables, high-strength fiber cables, or a combination of both.

[0012] Secondly, based on the first aspect, a method for installing a tension leg floating wind turbine platform foundation is also provided, including the following steps: The tower transition section, the central jacket, and the Y-shaped pontoon are prefabricated respectively.

[0013] The central jacket is assembled and connected to the Y-shaped pontoon, and the tower transition section is installed on top of the central jacket to form the main body of the floating foundation.

[0014] The floating foundation is integrated with the wind turbine tower and wind turbine, and towed with the help of temporary auxiliary facilities.

[0015] After the floating foundation body is towed to the target sea area, the Y-shaped pontoon is connected to the seabed anchoring foundation through the tension leg system to complete the installation.

[0016] Furthermore, in the prefabrication step, the central jacket adopts standardized node prefabrication and structural segmented parallel prefabrication, and the Y-shaped pontoon is divided into a central pontoon segment and three cantilever pontoon segments, with each segment being prefabricated synchronously.

[0017] Furthermore, during the towing process, reusable temporary buoys or dedicated auxiliary equipment are used to provide towing stability for the floating foundation.

[0018] Furthermore, in the installation step, the upper end of the tension tendon of the tension leg system is connected to the end of the cantilever buoy, and the lower end is connected to the seabed anchoring foundation. By adjusting the pretension of the tension leg system, the design draft of the platform foundation is located near the middle of the height of the central jacket.

[0019] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: 1. This invention, through the integrated structural design of the top tower transition section, the central jacket, and the bottom Y-shaped pontoon, eliminates the need for the side pontoons or side columns required by conventional towed self-stabilizing TLP wind power platforms, thus achieving a significant simplification of the foundation structure of the tension leg wind power platform. The combination of integrated design and the absence of permanent side pontoons significantly reduces the amount of steel used in the foundation and lowers the structural weight. The resulting cost reduction effect far exceeds that of optimizing a single component, achieving a systematic reduction in foundation costs.

[0020] 2. By placing the bottom Y-shaped buoy at a position far from the sea surface, this invention effectively reduces the direct effect of wave load on the floating body. The bottom arrangement of the Y-shaped buoy, combined with the support of the central jacket, ensures that the displacement of the floating body is mainly provided by the bottom Y-shaped buoy. The design draft is located near the middle of the height of the central jacket, which greatly reduces the disturbance of waves to the floating body, improves the motion performance of the platform, and achieves both wave load reduction and motion performance improvement.

[0021] 3. This invention uses a frame structure with three main legs and cross struts for the central jacket, which allows waves to pass through the discrete jacket structure. Compared with a large-diameter closed central column structure, this effectively reduces the second-order wave load. The wave-permeable characteristics of the central jacket and the design of the bottom Y-shaped pontoon away from the sea surface work together to further reduce the hydrodynamic load on the platform, increase the power generation of the wind turbine, and optimize hydrodynamic performance and power generation efficiency.

[0022] 4. This invention forms a stable three-way tension leg system through the symmetrical arrangement of the central buoy and three cantilever buoys of the Y-shaped buoy, and the corresponding connection of three sets of tension ribs. The equilateral triangular cross section of the central buoy is symmetrically arranged with the 120-degree axis of the cantilever buoys, which makes the platform foundation more evenly stressed in all directions and the pretension distribution of the tension leg system more reasonable, thus achieving the unity of structural symmetry and mooring stability.

[0023] 5. Through the modular design of the tower transition section, the present invention enables the tower base to be flexibly adapted to the actual size of the wind turbine tower without additional adjustments to the overall structure. The combination of the operation and maintenance platform, the tower base, and the tower support structure not only meets the load-bearing requirements of the wind turbine tower, but also provides space for the arrangement of platform operation and maintenance equipment, thus realizing the integration of load-bearing function and operation and maintenance function.

[0024] 6. This invention significantly simplifies the construction process through standardized segmented design and parallel prefabrication. The central jacket can draw on the mature construction model of shallow-water fixed wind turbine jacket foundations, and the Y-shaped pontoon can be divided into central pontoon segments and cantilever pontoon segments for simultaneous prefabrication. All components can be constructed in parallel and efficiently connected, achieving a significant improvement in construction efficiency and meeting the core requirements of large-scale wind farm development for rapid construction and batch delivery of floating foundations. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the tension leg floating wind power platform foundation of the present invention.

[0026] Figure 2 This is a front view of the tension leg floating wind power platform foundation of the present invention.

[0027] Figure 3 This is a top view of the floating body portion of the tension leg floating wind power platform foundation of the present invention.

[0028] The following are the labels in the diagram: 1. Tower transition section; 11. Tower base; 12. Tower support structure; 13. Operation and maintenance platform; 2. Central jacket; 21. Main leg; 22. Support rod; 3. Y-shaped pontoon; 31. Central pontoon; 32. Cantilever pontoon; 4. Tension leg system; 5. Anchor foundation; 61. Wind turbine; 62. Wind turbine tower. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0030] Implementation Plan like Figures 1-3 As shown, this implementation plan provides a tension leg floating wind power platform foundation suitable for large-scale wind farm development in deep sea areas. It is characterized by including a tower transition section (1), a central jacket (2), a Y-shaped pontoon (3), and a tension leg system (4). The tower transition section (1) is located at the top of the platform foundation, with its top for docking with the wind turbine tower (62) and its bottom connected to the central jacket (2); The central jacket (2) is located at the center of the platform foundation, with its top supporting the tower transition section (1) and its bottom supporting the Y-shaped pontoon (3); The Y-shaped pontoon (3) is located at the bottom of the platform foundation and is used to provide the main buoyancy for the platform foundation; The tension leg system (4) connects the Y-shaped pontoon (3) to the seabed anchoring foundation (5) to provide downward pretension to the platform foundation.

[0031] The Y-shaped pontoon (3) includes a central pontoon (31) and three cantilever pontoons (32). The central pontoon (31) is located at the center of the Y-shaped pontoon (3), and its horizontal cross section is an equilateral triangle. The three cantilever pontoons (32) extend outward from the corner ends of the central pontoon (31) and are arranged symmetrically at 120-degree intervals along the circumferential direction.

[0032] The vertical cross-section of the three cantilevered pontoons (32) is rectangular. Their inner ends are connected to the central pontoon (31), and their outer ends are connected to the tension leg system (4). The interiors of the central pontoon (31) and the cantilevered pontoons (32) can be divided into ballast tanks or empty tanks.

[0033] The central guide frame (2) includes three main legs (21) and several support rods (22). The three main legs (21) are arranged symmetrically along the circumferential direction, with a circular cross section. The center distance gradually decreases from the bottom to the top, and they are arranged at an angle. The three main legs (21) are connected by several intersecting support rods (22) with circular cross sections to form a stable frame structure.

[0034] The tower transition section (1) includes an operation and maintenance platform (13), a tower base (11), and a tower support structure (12). The operation and maintenance platform (13) is located at the bottom of the tower transition section (1). The tower base (11) is cylindrical, with its bottom located at the center of the operation and maintenance platform (13) and its top used to connect with the wind turbine tower (62). The tower base (11) is connected to the operation and maintenance platform (13) through the tower support structure (12). The interior of the tower base (11) is used for cable suspension and electrical equipment arrangement.

[0035] The tension leg system (4) includes three sets of tension tendons. The upper ends of the three sets of tension tendons are connected to the ends of the three cantilevered buoys (32) of the Y-shaped buoy (3), and the lower ends are connected to the seabed anchoring foundation (5). Each set of tension tendons includes several tension tendons, which are arranged vertically or with a moderately outward expansion at the bottom. The tension tendons are made of steel cables, high-strength fiber cables, or a combination of both.

[0036] On the other hand, a method for installing a tension leg floating wind turbine platform foundation is also provided, including the following steps: The tower transition section (1), the central jacket (2) and the Y-shaped pontoon (3) are prefabricated respectively. In the prefabrication step, the central jacket (2) adopts standardized node prefabrication and structural segment prefabrication in parallel. The Y-shaped pontoon (3) is divided into a central pontoon (31) segment and three cantilever pontoon (32) segments, and each segment is prefabricated simultaneously. The central jacket (2) is assembled and connected with the Y-shaped pontoon (3), and the tower transition section (1) is installed on the top of the central jacket (2) to form the main body of the floating foundation; The floating foundation body is integrated with the wind turbine tower (62) and the wind turbine (61), and towing is completed with the help of temporary auxiliary facilities. During the towing process, reusable temporary floating boxes or special auxiliary tooling facilities are used to provide towing stability for the floating foundation body. After the floating foundation body is towed to the target sea area, the Y-shaped pontoon (3) is connected to the seabed anchoring foundation (5) through the tension leg system (4) to complete the installation. In the installation step, the upper end of the tension tendon of the tension leg system (4) is connected to the end of the cantilever pontoon (32), and the lower end is connected to the seabed anchoring foundation (5). By adjusting the pretension of the tension leg system (4), the design draft of the platform foundation is located near the middle of the height of the central jacket (2).

[0037] In this embodiment, the platform foundation of the present invention adopts an integrated structural design of a top tower transition section 1, a central jacket 2, and a bottom Y-shaped pontoon 3. The tower transition section 1 is used to bear the load of the upper wind turbine tower 62 and the wind turbine 61. The central jacket 2 is used to transfer the upper load to the bottom Y-shaped pontoon 3. The Y-shaped pontoon 3 is used to provide the main buoyancy for the platform foundation. The three parts work together to form a complete load-bearing and buoyancy system. This eliminates the need for the side pontoons or side columns required by conventional towed self-stabilizing TLPs, which greatly simplifies the structure of the platform foundation and significantly reduces the amount of steel used. The integrated design makes the load transfer path between the components more direct and the structural efficiency higher.

[0038] The bottom Y-shaped pontoon 3 is positioned far from the sea surface, significantly reducing the portion of the buoy directly affected by waves. Its design draft is located near the middle of the height of the central jacket 2, placing the Y-shaped pontoon 3 at a greater depth below the water surface. This significantly reduces wave disturbance to the buoy. Simultaneously, the central jacket 2 employs a discrete frame structure with three main legs 21 and cross struts 22, allowing waves to pass through. Compared to a large-diameter closed central column structure, this effectively reduces second-order wave loads. The positioning of the Y-shaped pontoon 3 far from the sea surface, combined with the wave-permeable characteristics of the central jacket 2, reduces the hydrodynamic load on the platform, improves its motion performance, and is beneficial for increasing the power generation of the wind turbine 61.

[0039] The tension leg system 4 employs three sets of tension tendons, which are connected to the ends of the three cantilevered pontoons 32 of the Y-shaped pontoon 3, and the lower end is connected to the seabed anchoring foundation 5. The three sets of tension tendons are arranged symmetrically at 120-degree intervals along the circumference, forming a stable triaxial mooring. The tension leg system 4 provides downward pretension to the platform, ensuring the stability of the platform foundation at the design draft. The interior of the central pontoon 31 and the cantilevered pontoons 32 of the Y-shaped pontoon 3 can be divided into ballast tanks or empty tanks. By adjusting the ballast water, the platform's center of gravity and tension leg pretension can be adjusted to ensure the stability of the platform under different operating conditions. The symmetrical arrangement of the three sets of tension tendons makes the platform more evenly stressed in all directions, improving the reliability of the mooring system.

[0040] The platform's basic structure is simple, consisting of only three main parts: the tower transition section 1, the central jacket 2, and the Y-shaped pontoon 3. This facilitates the adoption of standardized segmented design and parallel prefabrication methods. The central jacket 2 can draw on the mature construction model of shallow water fixed wind turbine jacket foundations, adopting standardized node prefabrication and parallel prefabrication of structural sections. The Y-shaped pontoon 3 can be divided into a central pontoon 31 segment and three cantilever pontoon 32 segments. Each segment is prefabricated simultaneously. After prefabrication, all components are assembled to form the main body of the floating foundation. During installation, reusable temporary pontoons or special auxiliary tooling facilities are used to solve the problem of towing stability, avoiding the need to install side pontoons or side columns on the permanent structure.

[0041] The present invention will be further described in detail below with reference to embodiments: Example 1 This embodiment uses a deep-sea wind farm development project as an example to provide a detailed description of the tension leg floating wind power platform foundation provided by the present invention.

[0042] The target sea area for this wind farm has a water depth of 120 meters and plans to install multiple 16 MW high-power offshore wind turbines. The tension leg floating wind power platform foundation in this embodiment includes a tower transition section 1, a central jacket 2, a Y-shaped pontoon 3, and a tension leg system 4.

[0043] The tower transition section 1 is located at the top of the platform foundation and includes an operation and maintenance platform 13, a tower base 11, and a tower support structure 12. The operation and maintenance platform 13 is located at the bottom of the tower transition section 1. The spare parts room for the wind turbine 61 and the typhoon generator are arranged on the platform. The tower base 11 is cylindrical, with its bottom located at the center of the operation and maintenance platform 13 and its top connected to the wind turbine tower 62. The tower base 11 is connected to the operation and maintenance platform 13 through the tower support structure 12. The interior of the tower base 11 is used for cable suspension and the arrangement of electrical and instrumentation equipment. The overall height of the tower transition section 1 is about 8 meters, and the side length of the operation and maintenance platform 13 is about 20 meters.

[0044] The central jacket 2 is located at the center of the platform foundation and includes three main legs 21 and several struts 22. The three main legs 21 are symmetrically arranged along the circumference and have a circular cross-section. The center-to-center spacing of the main legs 21 is larger at the bottom and smaller at the top. They are arranged at an angle in the vertical direction. The top is connected to the operation and maintenance platform 13 of the tower transition section 1, and the bottom is connected to the Y-shaped floating box 3. The three main legs 21 are connected by several intersecting struts 22 with circular cross-sections to form a stable frame structure. The central jacket 2 is about 32 meters high. The center-to-center spacing of the bottom of the main legs 21 is about 15 meters, and the center-to-center spacing of the top is about 10 meters. The main legs 21 and the struts 22 are all made of high-strength steel.

[0045] Y-shaped pontoons 3 are located at the bottom of the platform foundation and include a central pontoon 31 and three cantilever pontoons 32. The central pontoon 31 is located at the center of the Y-shaped pontoon 3 and has an overall equilateral triangle shape in horizontal cross section. Its corner ends are respectively connected to the three cantilever pontoons 32. The three cantilever pontoons 32 have a rectangular vertical cross section and are symmetrically arranged at 120-degree intervals along the center of the platform. Their inner ends are connected to the central pontoon 31 and their outer ends are connected to the tension leg system 4. The interior of the central pontoon 31 and the cantilever pontoons 32 can be divided into ballast tanks or empty tanks. The overall height of the Y-shaped pontoon 3 is about 8 meters, the side length of the central pontoon 31 is about 28 meters, and the length and width of the cantilever pontoons 32 are about 30 meters and 6 meters, respectively.

[0046] The tension leg system 4 uses three sets of tension tendons, with two tension tendons in each set, for a total of six tendons. The upper ends are connected to the ends of the three cantilever pontoons 32, and the lower ends are connected to the seabed anchorage foundation 5. The tension tendons are arranged vertically and use high-strength fiber cables. The tension leg system 4 provides downward pretension to the platform, so that the design draft of the platform foundation is located near the middle of the height of the central jacket 2.

[0047] During the installation process, the tower transition section 1, the central jacket 2, and the Y-shaped pontoon 3 are prefabricated separately. The central jacket 2 is prefabricated using standardized nodes and structural sections in parallel. The Y-shaped pontoon 3 is divided into a central pontoon 31 section and three cantilever pontoon 32 sections for simultaneous prefabrication. After prefabrication, the central jacket 2 and the Y-shaped pontoon 3 are assembled and connected, and the tower transition section 1 is installed on top of the central jacket 2 to form the main body of the floating foundation. Then, after the main body of the floating foundation is launched into the water, it is integrated with the wind turbine tower 62 and the wind turbine 61. It is then towed using reusable temporary pontoons. After towing to the target sea area, the Y-shaped pontoon 3 is connected to the seabed anchoring foundation 5 through the tension leg system 4. The pretension is adjusted to reach the design draft, and the temporary auxiliary facilities are removed to complete the installation.

[0048] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A tension leg floating wind power platform foundation suitable for large-scale wind farm development in deep-sea areas, characterized in that: It includes the tower transition section (1), the central jacket (2), the Y-shaped pontoon (3), and the tension leg system (4); The tower transition section (1) is located at the top of the platform foundation, with its top for docking with the wind turbine tower (62) and its bottom connected to the central jacket (2); The central jacket (2) is located at the center of the platform foundation, with its top supporting the tower transition section (1) and its bottom supporting the Y-shaped floating box (3); The Y-shaped pontoon (3) is located at the bottom of the platform foundation and is used to provide the main buoyancy for the platform foundation; The tension leg system (4) connects the Y-shaped pontoon (3) to the seabed anchoring foundation (5) to provide downward pretension to the platform foundation.

2. The tension leg floating wind turbine platform foundation according to claim 1, characterized in that, The Y-shaped pontoon (3) includes a central pontoon (31) and three cantilever pontoons (32). The central pontoon (31) is located at the center of the Y-shaped pontoon (3), and its horizontal cross section is an equilateral triangle. The three cantilever pontoons (32) extend outward from the corner ends of the central pontoon (31) and are arranged symmetrically at 120-degree intervals along the circumferential direction.

3. The tension leg floating wind turbine platform foundation according to claim 2, characterized in that, The vertical cross-section of the three cantilevered pontoons (32) is rectangular. Their inner ends are connected to the central pontoon (31), and their outer ends are connected to the tension leg system (4). The interiors of the central pontoon (31) and the cantilevered pontoons (32) can be divided into ballast tanks or empty tanks.

4. The tension leg floating wind turbine platform foundation according to claim 1, characterized in that, The central guide frame (2) includes three main legs (21) and several support rods (22). The three main legs (21) are arranged symmetrically along the circumferential direction, with a circular cross section. The center distance gradually decreases from the bottom to the top, and they are arranged at an angle. The three main legs (21) are connected by several intersecting support rods (22) with circular cross sections to form a stable frame structure.

5. The tension leg floating wind turbine platform foundation according to claim 1, characterized in that, The tower transition section (1) includes an operation and maintenance platform (13), a tower base (11), and a tower support structure (12). The operation and maintenance platform (13) is located at the bottom of the tower transition section (1). The tower base (11) is cylindrical, with its bottom located at the center of the operation and maintenance platform (13) and its top used to connect with the wind turbine tower (62). The tower base (11) is connected to the operation and maintenance platform (13) through the tower support structure (12). The interior of the tower base (11) is used for cable suspension and electrical equipment arrangement.

6. The tension leg floating wind turbine platform foundation according to claim 1, characterized in that, The tension leg system (4) includes three sets of tension tendons. The upper ends of the three sets of tension tendons are connected to the ends of the three cantilevered buoys (32) of the Y-shaped buoy (3), and the lower ends are connected to the seabed anchoring foundation (5). Each set of tension tendons includes several tension tendons, which are arranged vertically or with a moderately outward expansion at the bottom. The tension tendons are made of steel cables, high-strength fiber cables, or a combination of both.

7. An installation method for a tension leg floating wind turbine platform foundation as described in any one of claims 1-6, characterized in that, Includes the following steps: The tower transition section (1), the central jacket (2), and the Y-shaped pontoon (3) are prefabricated respectively; The central jacket (2) is assembled and connected with the Y-shaped pontoon (3), and the tower transition section (1) is installed on the top of the central jacket (2) to form the main body of the floating foundation; After the floating foundation is launched into the water, it is integrated with the wind turbine tower (62) and the wind turbine (61), and the integrated towing is completed with the help of temporary auxiliary facilities; After the floating foundation body is towed to the target sea area, the Y-shaped pontoon (3) is connected to the seabed anchorage foundation (5) through the tension leg system (4) and tensioned to the design draft. The temporary auxiliary facilities are then removed to complete the installation.

8. The installation method according to claim 7, characterized in that, In the prefabrication step, the central jacket (2) adopts standardized node prefabrication and structural segmented parallel prefabrication, and the Y-shaped pontoon (3) is divided into a central pontoon (31) segment and three cantilever pontoon (32) segments, and each segment is prefabricated synchronously.

9. The installation method according to claim 7, characterized in that, During the towing process, reusable temporary buoys or dedicated auxiliary equipment are used to provide towing stability for the floating foundation.

10. The installation method according to claim 7, characterized in that, In the installation steps, the upper end of the tension tendon of the tension leg system (4) is connected to the end of the cantilever buoy (32), and the lower end is connected to the seabed anchoring foundation (5). By adjusting the pretension of the tension leg system (4), the design draft of the platform foundation is located near the middle of the height of the central jacket (2).

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