Main scale scheme design method for tension leg floating type fan foundation and floating type fan foundation

Abstract

The invention discloses a main scale scheme design method for a tension leg floating type fan foundation and the floating type fan foundation, and the method comprises the following steps: determining target wind field sea area water depth, extreme wave environment condition parameters and wind generating set design parameters, determining ship body displacement, determining the diameter of a central stand column, ship body draft, and the displacement and height of the central stand column; determining the displacement of a single buoyancy tank according to the displacement of the ship body and the displacement of the central upright post; the method comprises the steps of determining the included angle between every two adjacent buoyancy tanks and the linear distance between the outer edges of every two adjacent buoyancy tanks, determining the lengths of the buoyancy tanks according to the included angles and the linear distances, and determining the widths and the heights of the cross sections of the buoyancy tanks according to the water displacement of the buoyancy tanks and the lengths of the buoyancy tanks. The calculation mode is clear, and a tension leg floating type fan foundation scheme which is simpler in structure and more economical is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and in particular to a main scale scheme design method for a tension-leg floating wind turbine foundation and a floating wind turbine foundation. Background Art

[0002] Floating wind turbines are currently gaining widespread attention in the offshore wind power sector as a key equipment type for offshore wind power development, and have already achieved initial commercial operation. Floating wind turbine foundations typically include single-column, tension-leg, barge-mounted, and semi-submersible types. Tension-leg foundations offer advantages such as improved kinematic performance, improved wind turbine friendliness, improved adaptability to harsh sea conditions, and reduced overall steel consumption, making them a key technological development direction for floating wind power. However, these technologies still face technical challenges, including limited design specificity, unclear design methods, high displacement and steel consumption, and uneconomical overall solutions.

[0003] Therefore, a new main scale design method for tension leg floating wind turbine foundation and floating wind turbine foundation are urgently needed to solve the above technical problems. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, namely, to solve the problems faced by existing tension leg floating wind turbine foundations, such as the lack of targeted design of the main scale scheme, unclear design method, and uneconomical overall displacement and steel consumption.

[0005] To this end, in a first aspect, the present invention provides a method for designing a main scale scheme of a tension leg floating wind turbine foundation, characterized in that the floating wind turbine foundation includes a hull, the hull includes a central column, a pontoon group, and a strut, the pontoon group includes a plurality of pontoons, one end of each of the pontoons is fixedly connected to the bottom end of the central column, and the plurality of pontoons are arranged in a circular array. The design method comprises the following steps: S1. Determine the water depth of the target wind farm sea area, extreme wave environmental condition parameters, and wind turbine design parameters, wherein the extreme wave environmental condition parameters include: significant wave height, maximum wave height, spectral peak period, and wind speed; the wind turbine design parameters include: the relative position, external geometric dimensions, weight, center of gravity position, and gyration radius of the nacelle, rotor, and tower after assembly on the floating wind turbine foundation; S2, determine the hull displacement; S3, determining the diameter of the central column and the hull draft, determining the displacement of the central column according to the central column diameter and the hull draft, and determining the height of the central column according to the extreme wave environment condition parameters and the hull draft; S4, determining the displacement of each pontoon according to the hull displacement and the central column displacement; S5, determining the included angle between two adjacent pontoons and the straight-line distance between the outer edges of the two adjacent pontoons, and determining the length of the pontoons according to the included angle and the straight-line distance; S6, determining the width and height of the cross section of the pontoon according to the displacement and length of the pontoon; S7, determining the main dimensional parameters of the hull, wherein the main dimensional parameters of the hull include hull displacement, center column diameter and height, hull draft, pontoon length, and pontoon cross-sectional width and height; S8. Perform a hydrostatic and hydrodynamic analysis on the main scale parameters of the hull, and determine the main scale scheme of the primary floating wind turbine foundation based on whether the calculated offset period of the hull heave wave force curve satisfies the correspondence relationship with the spectral peak period of the extreme wave conditions, wherein the main scale scheme of the primary floating wind turbine foundation includes the hull displacement, the hull draft, the center column diameter and height, the pontoon length, and the width and height of the pontoon cross section.

[0006] In a specific embodiment of the above-mentioned tension leg floating wind turbine foundation main dimension scheme design method, the hull further includes a transverse brace and a diagonal brace, a transverse brace is fixed between two adjacent pontoons, and a diagonal brace is fixed between the pontoons and the central column, and the inner diameter and outer diameter of the transverse brace and the diagonal brace are equal. The design method further includes: S9, determining the inner diameter and outer diameter of the cross brace, and determining the initial cross brace installation position according to the distance between the root of the cross brace connected to the pontoon and the outer edge of the pontoon; S10, determining an initial installation position of the diagonal brace according to whether the angle between the diagonal brace and the central column is within a set angle range; S11, structural planning and design of the hull and carrying out structural analysis and evaluation, judging whether the hull structure and the cross braces and diagonal braces meet the requirements of the selected structural design specifications based on the evaluation results, and determining the main scale plan of the final floating wind turbine foundation.

[0007] In the specific implementation of the tension leg floating wind turbine foundation main scale scheme design method, the specific steps of "determining whether the hull structure and the cross braces and diagonal braces meet the requirements of the selected structural design specifications based on the evaluation results and determining the parameters of the final floating wind turbine foundation main scale scheme" include: If the requirements of the structural design code are met, the primary floating wind turbine foundation main dimension scheme, the current installation positions of the diagonal braces and transverse braces, and the inner and outer diameters will be used as the final floating wind turbine foundation main dimension scheme; If the requirements of the structural design specifications are not met, the hull structure planning and design, the installation positions of the transverse braces and the diagonal braces, and the corresponding wall thicknesses are adjusted, and then steps S9-S11 are repeated until the requirements of the structural design specifications are met.

[0008] In the specific implementation of the tension leg floating wind turbine foundation main scale scheme design method, the step of "determining the primary floating wind turbine foundation main scale scheme based on whether the calculated hull heave wave force curve offset period satisfies the corresponding relationship with the spectrum peak period of the extreme wave condition" specifically includes: If the calculated heave wave force curve offset period corresponds to the spectrum peak period of extreme wave conditions, the current main scale parameters of the hull are determined as the main scale scheme of the primary floating wind turbine foundation; If the calculated heave wave force curve offset period does not satisfy the corresponding relationship with the spectrum peak period of the extreme wave condition, the diameter of the central column is adjusted, and then steps S3-S6 are repeated until the calculated heave wave force curve offset period satisfies the corresponding relationship with the spectrum peak period of the extreme wave condition.

[0009] In the specific implementation of the above-mentioned tension leg floating wind turbine foundation main dimension scheme design method, the step of "determining the hull displacement" specifically includes: Determine the pretension of a single mooring line connected to the outer edge of the buoyancy box, and determine the total pretension based on the number of mooring lines; The hull displacement is calculated based on the total pretension and the first set ratio.

[0010] In a specific embodiment of the above-mentioned method for designing the main dimensions of a tension leg floating wind turbine foundation, the step of "determining the height of the central column according to the extreme wave environment condition parameters and the hull draft" specifically includes: Determine the height of the central column above the waterline based on extreme wave conditions; The sum of the hull draft and the height of the central column above the waterline is taken as the height of the central column.

[0011] In the specific implementation of the above-mentioned tension leg floating wind turbine foundation main dimension scheme design method, the step of "determining the displacement of a single pontoon according to the hull displacement and the central column displacement" specifically includes: Obtain the difference between the hull displacement and the center column displacement, and divide the difference by the number of pontoons to obtain the displacement of a single pontoon.

[0012] In a second aspect, the present invention further provides a tension leg floating wind turbine foundation designed based on the main scale design method of the tension leg floating wind turbine foundation described in any one of the first aspects, characterized in that it includes a hull, the hull includes a central column, a pontoon group and a strut, the pontoon group includes a plurality of pontoons, one end of each of the plurality of pontoons is fixedly connected to the bottom end of the central column and is distributed in a circular array with the axis of the central column as the center, the strut includes a transverse strut and an oblique strut, a transverse strut is fixed between two adjacent pontoons, and a oblique strut is fixed between the top of the pontoon and the outer wall of the central column.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The main scale scheme design method provided by the present invention can quickly and accurately calculate the main scale dimensions of a floating wind turbine foundation. The calculation method is clear and can provide a tension leg floating wind turbine foundation scheme with a relatively simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 It is a structural diagram of the tension leg floating wind turbine foundation; Figure 2 This is a schematic diagram of the overall structure of the hull provided by the present invention; Figure 3 It is a flow chart of the steps of the main scale scheme design method of the tension leg floating wind turbine foundation provided by the present invention.

[0015] List of reference numerals: 1. Hull; 2. Center column; 3. Buoyancy box; 4. Transverse brace; 5. Diagonal brace; 6. Mooring system; 61. Mooring line; 62. Anchor; 7. Wind turbine generator set; 71. Wind turbine cabin assembly; 72. Tower. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate description and simplify the present invention. They are not intended to indicate or imply that the systems or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the use of terms such as "first" and "second" to define components is intended solely to facilitate distinction between such components. Unless otherwise stated, these terms have no special meanings and should not be construed as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0019] The present invention relates to the field of offshore wind power generation technology, and in particular to a method for designing a principal dimension scheme for a tension-leg floating wind turbine foundation and a floating wind turbine foundation. The purpose is to address the problems faced by existing tension-leg floating wind turbine foundations, such as the lack of targeted design of the primary geometric dimensions of the hull, unclear design methods, and difficulty in rapid iterative optimization of overall displacement and steel usage. To this end, the present invention provides a method for designing a principal dimension scheme for a tension-leg floating wind turbine foundation, which can quickly and accurately calculate the principal dimensions of the hull using a clear calculation method, and can provide a relatively simple tension-leg floating wind turbine foundation scheme.

[0020] Hereinafter, the main dimension scheme design method of the tension leg floating wind turbine foundation and the floating wind turbine foundation provided by the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0021] See Figure 1-3 The present invention provides a design method for the main scale scheme of a tension leg floating wind turbine foundation. The floating wind turbine foundation includes a hull 1, which includes a central column 2, a pontoon group 3 and a strut. The pontoon group 3 includes a plurality of pontoons 3, one end of each of the plurality of pontoons 3 is fixedly connected to the bottom end of the central column 2, and the plurality of pontoons 3 are arranged in a circular array. The design method includes the following steps: S1. Determine the water depth of the target wind farm, extreme wave environmental condition parameters, and wind turbine design parameters. The extreme wave environmental condition parameters include significant wave height, maximum wave height, spectral peak period, and wind speed. The wind turbine design parameters include the relative position, external geometry, weight, center of gravity, and gyration radius of the nacelle, rotor, and tower after assembly on the floating wind turbine foundation. S2, determine the hull displacement; S3, determining the diameter of the central column and the hull draft, determining the displacement of the central column based on the diameter of the central column and the hull draft, and determining the height of the central column based on the extreme wave environment condition parameters and the hull draft; S4, determine the displacement of a single pontoon based on the hull displacement and the center column displacement; S5, determining the included angle between two adjacent pontoons and the straight-line distance between the outer edges of the two adjacent pontoons, and determining the length of the pontoons according to the included angle and the straight-line distance; S6, determining the width and height of the cross section of the pontoon according to the displacement and length of the pontoon; S7, determining the main dimensional parameters of the hull, which include hull displacement, center column diameter and height, hull draft, pontoon length, and pontoon cross-sectional width and height; S8. Perform hydrostatic and hydrodynamic analysis on the main scale parameters of the hull, and determine the main scale scheme of the primary floating wind turbine foundation based on whether the calculated offset period of the hull heave wave force curve satisfies the correspondence with the spectral peak period of extreme wave conditions. The main scale scheme of the primary floating wind turbine foundation includes the hull displacement, hull draft, center column diameter and height, pontoon length, and pontoon cross-section width and height.

[0022] In the above embodiment, step S2 of “determining the displacement of the hull” specifically includes: Determine the pretension of a single mooring line connected to the outer edge of the buoyancy box, and determine the total pretension based on the number of mooring lines; The hull displacement is calculated based on the total pretension and the first set ratio.

[0023] Specifically, the first setting ratio is 25-30%, the pretension of a single mooring cable is 500t, and when there are three pontoons, the number of mooring cables can be selected as 6 or 9. The hull displacement can be obtained by calculating that the total pretension is equal to 25-30% of the hull displacement.

[0024] In the above embodiment, the step of determining the center column diameter in step S3 specifically involves determining the center column diameter based on the tower diameter. The center column diameter is comparable to the tower diameter, so an initial center column diameter can be determined initially. If the calculated diameter in the subsequent step S8 is inappropriate, it can be adjusted. The hull draft is determined based on technical research and experience, generally within the range of 20-30 meters. For example, the hull draft can be 25 meters or 28 meters.

[0025] In the above embodiment, the step of “determining the displacement of a single pontoon according to the hull displacement and the central column displacement” specifically includes: Take the difference between the hull displacement and the center column displacement and divide it by the number of pontoons to get the displacement of each pontoon. For example, if there are three pontoons, divide the difference between the hull displacement and the center column displacement by three to get the displacement of each pontoon.

[0026] In the above embodiment, in step S5, since the pontoons are arranged at equal intervals around the circumference, the angle between two adjacent pontoons is easily determined. For example, when there are three pontoons, the angle is 120°. The mooring line suspension points are connected to the outer edges of the pontoons along their lengths. The straight-line distance between the outer edges of the two pontoons is 3-6 times the hull draft. This range is determined based on past project experience and technical research. Therefore, based on the hull draft determined in step S3, the straight-line distance between the outer edges of the two pontoons can be determined.

[0027] In step S6, the width-to-height ratio of the pontoon cross section is 1:1 to 1:1.3. Based on this ratio, the width and height of the pontoon cross section can be determined. After the calculations in steps S1-S6, the main dimensional parameters of the hull are determined.

[0028] In the above embodiment, preferably, the step of "determining the height of the central column according to the extreme wave environment condition parameters and the hull draft" specifically includes: Determine the height of the central column above the waterline based on extreme wave conditions; The height of the center column is the sum of the hull draft and the height of the center column above the waterline.

[0029] In one embodiment, the step of "determining the primary floating wind turbine foundation main dimension scheme based on whether the calculated hull heave wave force curve offset period satisfies the corresponding relationship with the spectrum peak period of the extreme wave condition" specifically includes: If the calculated heave wave force curve offset period corresponds to the spectrum peak period of extreme wave conditions, the current main scale parameters of the hull are determined as the main scale scheme of the primary floating wind turbine foundation; If the calculated heave wave force curve offset period does not satisfy the corresponding relationship with the spectrum peak period of the extreme wave condition, the diameter of the central column is adjusted, and then steps S3-S6 are repeated until the calculated heave wave force curve offset period satisfies the corresponding relationship with the spectrum peak period of the extreme wave condition.

[0030] In one embodiment, the hull further includes a transverse brace and a diagonal brace. A transverse brace is fixed between two adjacent pontoons, and a diagonal brace is fixed between the pontoons and the central column. The inner diameter and outer diameter of the transverse brace and the diagonal brace are equal. The design method further includes: S9, determining the inner diameter and outer diameter of the cross brace, and determining the initial cross brace installation position based on the distance between the root of the cross brace connected to the pontoon and the outer edge of the pontoon; the wall thickness of the cross brace can be determined by the difference between the inner diameter and the outer diameter of the cross brace; the cross brace is cylindrical, and the distance between the root of the cross brace and the outer edge of the pontoon is greater than or equal to twice the outer diameter of the cross brace, based on which the initial cross brace installation position can be determined; S10, determining an initial installation position of the diagonal brace according to whether the included angle between the diagonal brace and the central column is within a set included angle range; illustratively, the included angle range is set to 35°-50°, such as 40° or 45°; S11: Conduct structural planning and design of the hull and conduct structural analysis and assessment. Based on the assessment results, determine whether the hull structure, cross bracing, and diagonal bracing meet the requirements of the selected structural design specifications, and then determine the final floating wind turbine foundation main dimensions. The final floating wind turbine foundation main dimensions include hull displacement, hull draft, center column diameter and displacement, pontoon length, pontoon cross-sectional width and height, mooring system plan, cross bracing inner and outer diameters and installation locations, and diagonal bracing inner and outer diameters and installation locations.

[0031] In the above embodiment, the specific steps of “determining whether the hull structure and the cross braces and diagonal braces meet the requirements of the selected structural design specifications based on the evaluation results and determining the main dimension scheme parameters of the final floating wind turbine foundation” include: If the requirements of the structural design code are met, the main dimension scheme of the primary floating wind turbine foundation, the installation positions of the diagonal braces and the transverse braces, and the inner and outer diameters shall be used as the main dimension scheme of the final floating wind turbine foundation; If the requirements of the structural design specifications are not met, adjust the hull structure planning and design, the installation positions of the transverse and diagonal braces, and the corresponding wall thickness (i.e., the difference between the inner and outer diameters of the transverse and diagonal braces), and repeat steps S9-S11 until the requirements of the structural design specifications are met. Adjustments to the hull structure planning and design include adjustments to plate thickness, structural component dimensions, and specific layout. Staff can flexibly adjust according to actual requirements.

[0032] Based on the main scale design method of the tension leg floating wind turbine foundation described in the above embodiment, refer to Figure 1-2 The present invention also provides a tension leg floating wind turbine foundation designed using the above method, including a hull 1, the hull 1 includes a central column 2, a pontoon group and a strut, the pontoon group includes a plurality of pontoons 3, one end of the plurality of pontoons 3 is fixedly connected to the bottom end of the central column 2 and is distributed in a circular array with the axis of the central column as the center, ballast water tanks are provided in the central column 2 and the pontoons 3, the struts include transverse struts 4 and diagonal struts 5, a transverse strut 4 is fixed between two adjacent pontoons 3, and a diagonal strut 5 is fixed between the top of the pontoon 3 and the outer wall of the central column 2.

[0033] In this application, the top of the central column 2 is used to install a wind turbine generator set 7, which includes a wind turbine nacelle assembly 71 and a tower 72. The tower 72 is fixed to the top of the central column 2, and the wind turbine nacelle assembly 71 is installed on the tower 72. The hull 1 is installed on the sea through a mooring system 6. Figure 1 As shown, there are three mooring systems 6, each comprising mooring cables and anchors. Each mooring cable set is connected to the outer edge of the buoy 3. The anchors are installed on the seabed, and the angle between the connecting line between the top of the mooring cable and the anchor connection point and the vertical line between the top of the mooring cable and the seabed is 8-15 degrees.

[0034] In one embodiment, the cross brace 4 is a cylinder, and the distance between the root of the cross brace 4 and the outer edge of the buoyancy tank 3 is greater than or equal to twice the outer diameter of the cross brace 4 .

[0035] In one embodiment, the diagonal support rod 5 is a cylinder, the distance between the root of the diagonal support rod 5 and the outer edge of the pontoon 3 is greater than or equal to twice the diameter of the diagonal support rod 5, and the angle between the diagonal support rod 5 and the central column 2 is 35°~50°.

[0036] The primary dimension scheme design method provided by the present invention can quickly and accurately calculate the primary dimension of a floating wind turbine foundation. The calculation method is clear and can provide a relatively simple tension-leg floating wind turbine foundation scheme. An example is provided. A 16MW tension-leg floating wind turbine scheme developed based on the design method of this application has an overall displacement of less than 11,000 tons and an overall steel utilization rate of less than 240 tons / MW. This offers significant advantages over conventional semi-submersible wind turbine schemes, as shown in Table 1 below.

[0037] Table 1 shows the foundation scheme of a 16MW tension leg floating wind turbine based on the design method of this application.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A design method for the main dimensions of a tension leg floating wind turbine foundation, characterized in that: The floating wind turbine foundation includes a hull, the hull includes a central column, a pontoon group and a strut, the pontoon group includes a plurality of pontoons, one end of each of the pontoons is fixedly connected to the bottom end of the central column, and the plurality of pontoons are arranged in a circular array. The design method includes the following steps: S1. Determine the water depth of the target wind farm sea area, extreme wave environmental condition parameters, and wind turbine design parameters, wherein the extreme wave environmental condition parameters include: significant wave height, maximum wave height, spectral peak period, and wind speed; the wind turbine design parameters include: the relative position, external geometric dimensions, weight, center of gravity position, and gyration radius of the nacelle, rotor, and tower after assembly on the floating wind turbine foundation; S2, determine the hull displacement; S3, determining the diameter of the central column and the hull draft, determining the displacement of the central column according to the central column diameter and the hull draft, and determining the height of the central column according to the extreme wave environment condition parameters and the hull draft; S4, determining the displacement of each pontoon according to the hull displacement and the central column displacement; S5, determining the angle between two adjacent pontoons and the straight-line distance between the outer edges of the two adjacent pontoons, and determining the length of the pontoons according to the angle and the straight-line distance; S6, determining the width and height of the cross section of the pontoon according to the displacement and length of the pontoon; S7, determining the main dimensional parameters of the hull, wherein the main dimensional parameters of the hull include hull displacement, center column diameter and height, hull draft, pontoon length, and pontoon cross-sectional width and height; S8. Perform a hydrostatic and hydrodynamic analysis on the main scale parameters of the hull, and determine the main scale scheme of the primary floating wind turbine foundation based on whether the calculated offset period of the hull heave wave force curve satisfies the correspondence relationship with the spectral peak period of the extreme wave condition, wherein the main scale scheme of the primary floating wind turbine foundation includes the hull displacement, the hull draft, the diameter and height of the center column, the pontoon length, and the width and height of the pontoon cross section.

2. The main dimension scheme design method of a tension leg floating wind turbine foundation according to claim 1 is characterized in that: The hull further includes a transverse brace and an oblique brace, wherein a transverse brace is fixed between two adjacent pontoons, and an oblique brace is fixed between the pontoons and the central column, wherein the inner diameter and outer diameter of the transverse brace and the oblique brace are equal, and the design method further includes: S9, determining the inner diameter and outer diameter of the cross brace, and determining the initial cross brace installation position according to the distance between the root of the cross brace connected to the pontoon and the outer edge of the pontoon; S10, determining an initial installation position of the diagonal brace according to whether the angle between the diagonal brace and the central column is within a set angle range; S11, structural planning and design of the hull and carrying out structural analysis and evaluation, judging whether the hull structure and the cross braces and diagonal braces meet the requirements of the selected structural design specifications based on the evaluation results, and determining the main scale plan of the final floating wind turbine foundation.

3. The main dimension scheme design method of a tension leg floating wind turbine foundation according to claim 2 is characterized in that: The specific steps of "determining whether the hull structure, cross bracing, and diagonal bracing meet the selected structural design code requirements based on the evaluation results and determining the main dimension parameters of the final floating wind turbine foundation" include: If the requirements of the structural design code are met, the primary floating wind turbine foundation main dimension scheme, the current installation positions of the diagonal braces and transverse braces, and the inner and outer diameters will be used as the final floating wind turbine foundation main dimension scheme; If the requirements of the structural design specifications are not met, the hull structure planning and design, the installation positions of the transverse braces and the diagonal braces, and the corresponding wall thicknesses are adjusted, and then steps S9-S11 are repeated until the requirements of the structural design specifications are met.

4. The main dimension scheme design method of a tension leg floating wind turbine foundation according to claim 1 is characterized in that: The steps of "determining the main scale scheme of the primary floating wind turbine foundation based on whether the calculated offset period of the hull heave wave force curve satisfies the correspondence relationship with the spectrum peak period of extreme wave conditions" specifically include: If the calculated heave wave force curve offset period corresponds to the spectrum peak period of extreme wave conditions, the current main scale parameters of the hull are determined as the main scale scheme of the primary floating wind turbine foundation; If the calculated heave wave force curve offset period does not satisfy the corresponding relationship with the spectrum peak period of the extreme wave condition, the diameter of the central column is adjusted, and then steps S3-S6 are repeated until the calculated heave wave force curve offset period satisfies the corresponding relationship with the spectrum peak period of the extreme wave condition.

5. The main dimension scheme design method of a tension leg floating wind turbine foundation according to claim 1 is characterized in that: The steps for "Determining Hull Displacement" include: Determine the pretension of a single mooring line connected to the outer edge of the buoyancy box, and determine the total pretension based on the number of mooring lines; The hull displacement is calculated based on the total pretension and the first set ratio.

6. The main dimension scheme design method of a tension leg floating wind turbine foundation according to claim 1 is characterized in that: The step of "determining the height of the central column according to the extreme wave environmental condition parameters and the hull draft" specifically includes: Determine the height of the central column above the waterline based on extreme wave conditions; The sum of the hull draft and the height of the central column above the waterline is taken as the height of the central column.

7. The method for designing the main dimensions of a tension leg floating wind turbine foundation according to claim 1, characterized in that: The step of "determining the displacement of a single pontoon according to the hull displacement and the central column displacement" specifically includes: Obtain the difference between the hull displacement and the center column displacement, and divide the difference by the number of pontoons to obtain the displacement of a single pontoon.

8. A tension leg floating wind turbine foundation designed based on the tension leg floating wind turbine foundation main dimension scheme design method according to any one of claims 2 to 7, characterized in that: The invention comprises a hull, which comprises a central column, a pontoon group and a strut. The pontoon group comprises a plurality of pontoons, one end of each of the plurality of pontoons is fixedly connected to the bottom end of the central column and is distributed in a circular array with the axis of the central column as the center. The strut comprises a transverse strut and an oblique strut. A transverse strut is fixed between two adjacent pontoons, and an oblique strut is fixed between the top of the pontoon and the outer side wall of the central column.

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