Tension leg floating type wind power foundation platform

Abstract

The utility model discloses a tension leg floating type wind power foundation platform, which relates to the technical field of ocean engineering and comprises a wind turbine generator, a floating type wind power platform, a tension leg system and an anchoring foundation. The floating type wind power platform comprises an outer side horizontal rod system, angular point buoys, an inclined rod system, a wind turbine generator tower cylinder bearing platform and accessory components. The outer horizontal rod systems are connected to form a triangle, and an angular point buoy is arranged at each angular point of the triangle; the inclined rod system extends upwards from three angular points of the outer horizontal rod system to the wind turbine generator tower cylinder bearing platform, the wind turbine generator tower cylinder bearing platform is located over the outer horizontal rod system, and the outer horizontal rod system and the inclined rod system form a tetrahedral structure in space. The accessory component is arranged on the outer edge of the wind turbine generator tower cylinder bearing platform, and the wind turbine generator tower cylinder bearing platform is used for bearing the wind turbine generator above; and the structure is simple, the steel consumption is small, modular batch manufacturing can be realized, the stability is good, integrated wet mopping transportation and installation can be realized, and the installation time and the installation cost are effectively saved.

Description

Technical Field

[0001] This utility model belongs to the field of marine engineering technology, specifically relating to a tension leg floating wind power foundation platform. Background Technology

[0002] According to a World Bank analysis of 115 coastal countries, 71% of the exploitable offshore wind power capacity globally is located in deeper waters. Floating offshore wind turbines are the core equipment for developing deep-sea wind energy resources. Based on their foundation structure, wind turbines can be broadly categorized into semi-submersible, barge, tension leg (TLP), and single-pillar (Spar) types. Semi-submersible foundations rely on buoyancy for stability, providing overall stability through significant buoyancy and a catenary anchor system. They are suitable for a wide range of water depths, offer good self-buoyancy stability, are flexible in installation, highly accessible, and technologically mature. However, they are heavy, highly susceptible to wave loads, and require an active ballast system. Barge foundations rely on damping for stability, providing overall stability through a large waterline, buoyancy, and a catenary anchor system. They are simple in structure, easy to position, and relatively low in cost. However, they have a shallow draft, a high center of gravity, and are more sensitive to external environmental conditions, making them unsuitable for harsh sea conditions. Tension leg foundations rely on mooring stability, utilizing a tensioned anchor chain system (tension shank) to provide stability. They are compact, lightweight, have minimal movement amplitude, occupy little sea area, offer good stability, have low draft requirements, and are suitable for a wide range of water depths. However, they require sophisticated mooring system design, complex installation, and costly tension shanks. Single-column foundations, on the other hand, rely on ballast stability. They lower the center of gravity through bottom ballast and provide overall stability through a catenary anchor chain system. They are simple to design, easy to manufacture, have few moving parts, offer good stability, are less affected by wave loads, and are relatively inexpensive. However, they are suitable for a narrower water depth range, are complex to install, and inconvenient to maintain. They also have a low center of gravity and deep draft, making them suitable for deeper waters.

[0003] Tension leg offshore floating wind power platforms come in various structural styles, including traditional, Neptune-type, triangular or quadrangular truss structures, and towerless types. Traditional TLPs consist of several corner columns, central columns, and pontoons, with numerous connection points, complex structures, and a large amount of steel used. Neptune-type TLPs consist of central columns and cantilever structures, with a small waterline area, poor stability, and high construction, transportation, and installation costs. The base of a triangular or quadrangular truss structure TLP is roughly triangular or quadrilateral, with several pontoons arranged at the corners and center. The pontoons and towers are connected by numerous struts. Due to the large number of connection points, there is a risk of fatigue, construction is inconvenient, and construction costs are further increased. Towerless TLPs require special design for the upper wind turbines, lack a yaw system, and can only passively face the wind.

[0004] In view of the shortcomings of existing tension leg floating wind power platforms, the present invention aims to provide a tension leg floating wind power platform with a simple structure, modular mass production capability, good stability, and integrated wet-tow transportation and installation capability. Utility Model Content

[0005] The purpose of this invention is to provide a tension leg floating wind power foundation platform to address the aforementioned deficiencies in the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tension leg floating wind turbine foundation platform includes a wind turbine generator, a floating wind turbine platform, a tension leg system, and an anchoring foundation; the upper part of the floating wind turbine platform is used to support the wind turbine generator, and the lower part is connected to the anchoring foundation through the tension leg system.

[0008] The floating wind power platform includes an outer horizontal mast system, corner buoys, inclined mast system, wind turbine tower support, and auxiliary components. The outer horizontal mast system is connected to form a triangle, with a corner buoy at each corner of the triangle. The inclined mast system extends upward from the three corners of the outer horizontal mast system to the wind turbine tower support, which is located directly above the outer horizontal mast system. The outer horizontal mast system and the inclined mast system form a tetrahedral structure in space. The auxiliary components are located on the outer edge of the wind turbine tower support, which supports the wind turbines above.

[0009] Optionally, the wind turbine includes a bottom tower, a middle tower, an upper tower, wind turbine blades, a hub, and a nacelle.

[0010] Optionally, the wind turbine tower support is a cylindrical structure, with its upper part connected to the bottom tower and its lower part transferring the load to the floating wind power platform through an inclined rod system.

[0011] Optionally, the outer horizontal rod system is located on the same horizontal plane, and two adjacent rods in the inclined rod system are arranged in an isosceles triangle with the lower outer horizontal rod system.

[0012] Optionally, two corner buoys are provided at each corner point, and the two corner buoys at the same corner point are connected together by a connecting device.

[0013] Optionally, the corner buoy is a closed structure with a horizontal cross-section of a circle or rectangle, with its exterior in contact with seawater and its interior divided into ballast tanks and empty tanks.

[0014] Optionally, the anchoring foundation includes a ballast device and positioning piles located below the ballast device, and the ballast device is connected to the floating wind power platform above it through a tension leg system.

[0015] Optionally, the ballast device includes a circular ballast member and three strip ballast members evenly arranged around the circumference of the circular ballast member; four positioning piles are provided, located below the circular ballast member and the three strip ballast members respectively.

[0016] Optionally, the tension leg system consists of multiple tension tendons, wherein each corner is connected to the corresponding strip ballast member below via two tension tendons.

[0017] Optionally, the positioning pile is a combination structure of an upper cylindrical shape and a lower conical shape.

[0018] Beneficial effects: The tension leg floating wind turbine foundation platform of this utility model has the following advantages:

[0019] (1) It has a simple structure, uses little steel, can be modularly mass-produced, has good stability, and can be integrated for wet-trail transportation and installation, effectively saving installation time and costs.

[0020] (2) Fewer nodes effectively reduce the risk of fatigue;

[0021] (3) The upper wind turbine can be enlarged or reduced according to the safety requirements of different power units, so as to reduce the time and cost of redesign;

[0022] (4) It has positioning piles, which can prevent the anchor foundation from shifting and ensure the safety of the wind turbine during operation;

[0023] (5) It can reduce the impact of seabed geological conditions during the installation process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a tension leg floating wind power foundation platform in the embodiment;

[0025] Figure 2 This is an elevation view of the floating wind power platform in the embodiment;

[0026] Figure 3 This is an elevation view of the anchoring foundation in the embodiment.

[0027] In the diagram: 1. Wind turbine; 11. Bottom tower; 12. Middle tower; 13. Upper tower; 14. Wind turbine blade; 2. Floating wind turbine platform; 21. Outer horizontal mast system; 22. Corner buoy; 23. Inclined mast system; 24. Wind turbine tower foundation; 25. Auxiliary components; 3. Tension leg system; 4. Anchor foundation; 41. Positioning pile; 42. Circular ballast component; 43. Strip ballast component. Detailed Implementation

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0029] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0031] Example

[0032] like Figures 1-3 As shown, this embodiment provides a tension leg floating wind power foundation platform, including a wind turbine 1, a floating wind power platform 2, a tension leg system 3, and an anchoring foundation 4; the upper part of the floating wind power platform 2 is used to support the wind turbine 1, and the lower part is connected to the anchoring foundation 4 through the tension leg system 3.

[0033] The floating wind power platform 2 includes an outer horizontal mast system 21, corner buoys 22, inclined mast system 23, wind turbine tower support 24, and auxiliary components 25. The outer horizontal mast system 21 is connected to form a triangle, and a corner buoy 22 is provided at each corner of the triangle. The inclined mast system 23 extends upward from the three corners of the outer horizontal mast system 21 to the wind turbine tower support 24. The wind turbine tower support 24 is located directly above the outer horizontal mast system 21. The outer horizontal mast system 21 and the inclined mast system 23 form a tetrahedral structure in space. The auxiliary components 25 are located on the outer edge of the wind turbine tower support 24, which is used to support the wind turbine 1 above.

[0034] The outer horizontal strut system 21 has three struts with identical structural shapes. Preferably, the outer horizontal strut system 21 is located on the same horizontal plane, and the three struts form an equilateral triangle on the horizontal plane. The inclined strut system 23 also has three struts with identical structural shapes. The three struts extend from the three corner points of the outer horizontal strut system 21 to the center of the outer horizontal strut system 21 and then to the wind turbine tower support 24. Preferably, two adjacent struts in the inclined strut system 23 are arranged in an isosceles triangle with the lower outer horizontal strut system 21. The six struts can be round struts, variable cross-section struts, or other shaped struts, depending on the design load. Their shapes are not limited.

[0035] Preferably, both the outer horizontal rod system 21 and the inclined rod system 23 adopt a sealed structure, which can increase the drainage volume of the floating wind power platform 2, thereby increasing the buoyancy of the platform and reducing the size of the corner buoy 22, saving steel. During the assembly stage at the dock or shipyard, the corner buoy 22 is located on the water surface, providing self-buoyancy stability. After on-site installation, the corner buoy 22 is located below the water surface to reduce the impact of wave loads on the platform.

[0036] Above the floating wind power platform 2 is the wind turbine 1, which includes a bottom tower 11, a middle tower 12, an upper tower 13, wind turbine blades 14, a hub, and a nacelle. The bottom tower 11, middle tower 12, upper tower 13, and nacelle constitute the nacelle tower system, which supports the entire unit and ensures its normal operation. The wind turbine blades 14 and the hub constitute the wind turbine system. When the wind turbine blades 14 are rotated by the sea wind, they convert wind energy into mechanical energy. Then, the mechanical energy is transmitted to the main shaft of the wind turbine 1 in the form of torque through the hub, thus completing the conversion of offshore wind energy into mechanical energy.

[0037] Preferably, the wind turbine tower support 24 is a cylindrical structure, with its upper part connected to the bottom tower 11, and its lower part transferring the load to the floating wind power platform 2 through the inclined rod system 23.

[0038] The following is the specific structure of the corner buoy 22. In this embodiment, preferably, two corner buoys 22 are provided at each corner, for a total of six corner buoys 22. The two corner buoys 22 at the same corner are connected together by a connecting device. The corner buoys 22 are mainly for providing buoyancy and adjusting ballast. The number of them is only to provide a larger buoyancy and ballast adjustment range. Therefore, the number of corner buoys 22 is selected according to the actual situation, and the specific number is not limited.

[0039] Preferably, the corner buoy 22 is a closed structure with a horizontal cross-section of a circle or rectangle, with its exterior in contact with seawater and its interior divided into ballast tanks and empty tanks; specifically, the corner buoy 22 can adopt a closed structure of various shapes such as cylindrical, rectangular, and spherical.

[0040] The auxiliary component 25 provides space for installation and maintenance personnel to move around during the climbing operation.

[0041] The floating wind power platform 2 is composed of six corner pontoons 22, three connecting devices, three outer horizontal bars, three inclined bars, a wind turbine tower support 24, and an auxiliary component 25. While ensuring the overall motion performance and strength of the tension leg floating wind turbine, it greatly simplifies the platform structure, reduces the number of connection points between different rod systems, and effectively reduces fatigue risk. The simple platform foundation structure reduces steel consumption and is conducive to rapid mass production. The six corner pontoons 22 arranged at the corners of the floating wind power platform 2 give the platform good stability. It can realize the modular construction and assembly of the wind turbine 1 in the dock or shipyard, wet-towed transportation to the site, and integrated installation, which can effectively shorten the construction cycle and reduce the overall project cost.

[0042] The floating wind power platform 2 in this embodiment is suitable for wind turbine 1 with a vertical or horizontal axis tower. There is no need to redesign the wind turbine 1. The floating wind power platform 2 can be enlarged or reduced according to the size of the wind turbine 1 to meet the power requirements of different wind turbine 1, thus reducing the time and cost of redesign.

[0043] Below the floating wind turbine platform 2 are the tension leg system 3 and the anchoring foundation 4. The tension leg system 3 consists of multiple tension tendons, with each corner point connected to the anchoring foundation 4 via two tension tendons. Specifically, the tension tendons are divided into three groups, totaling six tendons, with one group corresponding to each corner point. When there is only one corner buoy 22 at each corner point, each tension tendon is connected to the corner buoy 22 at the top and to the anchoring foundation 4 at the bottom. When there are two or more corner buoys 22 at each corner point, each tension tendon is connected to a connecting device at the top and to the anchoring foundation 4 at the bottom, thus connecting the floating wind turbine platform 2 and the anchoring foundation 4 through the tension tendons.

[0044] In this embodiment, the tension tendon can be made of anchor chain, steel pipe, steel cable, synthetic fiber, or different materials in different sections.

[0045] After installation at sea, the corner buoy 22 and the outer horizontal mast system 21 will be located below the water surface, while part of the inclined mast system 23 will be above the water surface and part below. Since most of the floating wind power platform 2 is located below the water surface, the impact of wave loads on the floating wind power platform 2 can be effectively reduced. The buoyancy provided by the corner buoy 22 is much greater than the downward gravity of the foundation, so that the tension tendons are always in a stretched state, ensuring good stability and small movement amplitude of the platform. The small movement amplitude of the platform is conducive to improving the power generation efficiency of the wind turbine 1. At the same time, the tensioned mooring system adopted by the platform is more compact in structure and occupies less sea area than the catenary mooring system, making it more suitable for the large-scale development needs of future deep-sea wind farms.

[0046] The following is the specific structure of the anchor foundation 4. The anchor foundation 4 includes a ballast device and a positioning pile 41 located below the ballast device. The ballast device is connected to the floating wind power platform 2 above through the tension leg system 3.

[0047] Preferably, the ballast device includes a circular ballast member 42 and three strip ballast members 43 evenly arranged around the circumference of the circular ballast member 42; four positioning piles 41 are provided, respectively located below the circular ballast member 42 and the three strip ballast members 43; the positioning piles 41 are a combination structure of an upper cylindrical shape and a lower conical shape; wherein, the positioning piles 41 are located directly below the circular ballast member 42 and at the lower edge of the three strip ballast members 43.

[0048] Specifically, the circular ballast member 42 is located at the center, and three strip ballast members 43 are evenly distributed around the periphery of the circular ballast member 42. Each strip ballast member 43 corresponds to a set of tension tendons, and the tension tendons are connected to the top of the corresponding strip ballast member 43.

[0049] The anchoring foundation 4 has a simple structure and can be assembled as a whole with the floating wind power platform 2 in the dock or dry dock, and then wet-towed to the site for integrated installation. The ballast can be adjusted as needed to adjust the buoyancy it receives. During the wet-towed transportation stage, it can serve as part of the floating body. After arriving at the site, it keeps the floating wind power platform 2 and the upper wind turbine 1 stable, and ballasts the anchoring foundation 4 until the designed ballast is reached, so that the anchoring foundation 4 is firmly fixed to the seabed. Because the positioning piles 41 are set at the bottom, the influence of the seabed topography on the anchoring foundation 4 can be effectively reduced, and the anchoring foundation 4 can also be guaranteed not to deviate from its original position under long-term cyclic load.

[0050] In this embodiment, the tension leg floating wind power foundation platform uses corner pontoons 22 to provide the main buoyancy and stability for the entire platform through the outer horizontal rod system 21 and the inclined rod system 23. The tetrahedral structure has no internal support. This structure greatly simplifies the structure while ensuring safety and structural strength, reduces the number of rod connection points, and lowers the fatigue risk at the connection points. At the same time, it facilitates mass production and modular manufacturing, reduces the amount of steel used, and saves costs.

[0051] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A tension leg floating wind power foundation platform, characterized in that, The wind turbine (1), the floating wind power platform (2), the tension leg system (3) and the anchoring foundation (4); the upper part of the floating wind power platform (2) is used for supporting the wind turbine (1), and the lower part is connected with the anchoring foundation (4) through the tension leg system (3); The floating wind power platform (2) comprises an outer horizontal truss (21), a corner point buoy (22), an inclined truss (23), a wind turbine tower base (24) and an auxiliary component (25); the outer horizontal truss (21) is connected in a triangular shape, and the corner point buoy (22) is arranged at each corner point of the triangular shape; the inclined truss (23) extends upward from the three corner points of the outer horizontal truss (21) to the wind turbine tower base (24), the wind turbine tower base (24) is located directly above the outer horizontal truss (21), and the outer horizontal truss (21) and the inclined truss (23) form a tetrahedron structure in space; the auxiliary component (25) is arranged at the outer edge of the wind turbine tower base (24), and the wind turbine tower base (24) is used for carrying the wind turbine (1) above. The anchoring foundation (4) comprises a ballast device and a positioning pile (41) located below the ballast device, the ballast device is connected with the floating wind power platform (2) above through the tension leg system (3); the ballast device comprises a circular ballast component (42) and three strip-shaped ballast components (43) arranged uniformly in the circumferential direction of the circular ballast component; the positioning pile (41) is provided with four positioning piles, which are located below the circular ballast component (42) and the three strip-shaped ballast components (43) respectively.

2. A tension leg floating wind power foundation platform according to claim 1, wherein, The wind turbine (1) comprises a bottom tower (11), a middle tower (12), an upper tower (13), a wind turbine blade (14), a hub and a nacelle.

3. A tension leg floating wind power foundation platform according to claim 2, wherein, The wind turbine tower base (24) is a cylindrical structure, the upper part of which is connected with the bottom tower (11), and the lower part transmits the load to the floating wind power platform (2) through the inclined truss (23).

4. A tension leg floating wind power foundation platform according to claim 1, wherein, The outer horizontal trusses (21) are located on the same horizontal plane, and adjacent two bars in the inclined truss (23) are arranged in an isosceles triangle with the lower outer horizontal truss (21).

5. A tension leg floating wind power foundation platform according to claim 1, wherein, Two corner point buoys (22) are arranged at each corner point, and the two corner point buoys (22) at the same corner point are connected together through a connecting device.

6. A tension leg floating wind power foundation platform according to claim 1, wherein, The corner point buoy (22) is a closed structure with a circular or rectangular horizontal cross section, the outside of which is in contact with seawater, and the inside is divided into a ballast cabin and an empty cabin.

7. A tension leg floating wind power foundation platform according to claim 1, wherein, The tension leg system (3) is composed of a plurality of tension tendons, wherein two tension tendons are connected with the corresponding strip-shaped ballast component (43) below at each corner point.

8. A tension leg floating wind power foundation platform according to claim 1, wherein, The positioning pile (41) is a combined structure of an upper cylindrical part and a lower conical part.

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