CN115977886A - A floating wind turbine foundation suitable for deep sea installation - Google Patents

Abstract

The invention discloses a floating type fan foundation suitable for deep and open sea installation, which comprises a plurality of peripheral stand columns (2), a central stand column (3), a supporting member (5) and a mooring chain (6), wherein the peripheral stand columns are installed on the periphery of the central stand column through the supporting member and are obliquely installed outwards; the bottom of each peripheral upright post is connected with a floating body (4), the center of the floating body is vertically and crossly connected with the central upright post, and the floating bodies are connected with the peripheral upright posts, the central upright posts and the supporting structure into a whole. The invention is suitable for deep and open sea areas with average water depth of 100 m and above, can carry a fan with large capacity of 16MW and above, can effectively reduce the steel consumption, and has simple construction and low cost.

Description

A floating wind turbine foundation suitable for deep sea installation

technical field

The invention relates to offshore wind power technology, in particular to a floating wind turbine foundation suitable for installation in deep and open seas.

Background technique

With the gradual development of global offshore resources and the high demand for sea use in offshore areas, the overall development potential of offshore wind power is limited. Offshore wind power projects are gradually developing in deep seas. The floating support structure evolved step by step.

The floating offshore wind turbine infrastructure is the structure that supports the wind turbines on the sea. China's existing floating wind turbine foundation structure is only suitable for installation within a water depth of 100 meters, and the power of the installed wind turbine does not exceed 10MW. The foundation, the bottom triangle, and the top Y-shaped combined structure. The fan is located on one of the columns. The whole system is leveled by ballast. It is equipped with a 5.5MW fan, 28 kilometers offshore, and installed at a water depth of 30 meters; The structure of Fuyao floating offshore wind power platform adopts a three-column semi-submersible floating foundation, and the top and bottom are triangular composite structures. At an average water depth of about 65 meters offshore.

The design of deep-sea floating wind turbine platforms in deep seas with an average water depth of more than 100 meters is more difficult: on the one hand, the design of the main scale of the floating wind turbine foundation directly determines the amount of steel used for the floating body, which is the main factor affecting the economics of the entire wind turbine project , also directly lead to more difficult response analysis of the floating body under the joint action of deep sea wave current, wind turbine load, and mooring force, and the difficulty of structural strength analysis; on the other hand, the unique technical requirements for floating wind turbines, high-level typhoon Requirements, equipped with 16MW and above large-capacity wind turbines lead to an increasing load on the wind turbines, higher and higher technical requirements for work, and higher requirements for the floating body's anti-overturning ability, positioning and mooring ability, and stability. Therefore, there is an urgent need to design a floating wind turbine foundation suitable for use in deep sea areas with an average water depth of 100 meters and above.

Chinese patent application CN108146588A discloses an offshore floating wind power foundation structure, which forms a Y-shaped structure through three columns, a central buoy and trusses. Although this structure can reduce the center of gravity through the central buoy, improve the stability of the structure, and increase the overall water surface area of the structure through the columns, increase the stiffness of the water surface, thereby reducing the amplitude of structural surge motion and increasing the effective power generation time. However, due to There is no support at the bottom of the column, and the connection structure between the bottom of the three columns and the bottom of the central buoy is too simple, and the ratio is relatively small compared to the column, so that the drainage volume, especially the ballast adjustment range and the overall structural strength are limited, and the column It is installed perpendicular to the water surface, and the structural stability is improved through a longer central buoy. In stormy weather, the area moment of the waterplane surface and the increase of the stiffness of the waterplane surface are limited, and the restoring moment at a certain inclination angle is small, so it cannot Meet the overall strength and stability requirements of the wind turbine foundation in deep and open seas.

Contents of the invention

The technical problem to be solved by the present invention is to provide an economical, strong anti-overturning ability, good stability, high structural strength, and capable Large-capacity wind turbines of 16MW and above are suitable for offshore floating wind turbine foundations installed in deep and open seas.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A floating wind turbine foundation suitable for installation in deep and open seas, including a plurality of peripheral columns, a central column, support members and mooring chains, the periphery of the central column is connected to the peripheral column through the support member, wherein:

The peripheral column is installed obliquely outward, and the peripheral column is divided into an upper section, a middle section and a lower section along its height direction, the cross-sectional area of the middle section is larger than that of the lower section, and the upper section is higher than the water plane Setting, the middle section is placed in the waterline, and the lower section is set lower than the waterline;

The bottom of the peripheral column is connected to a floating body provided with a ballast tank inside, the floating body is placed horizontally, and the center of the floating body is vertically cross-connected with the central column;

The buoy is a Y-shaped structure with three branches, the branches include connecting buoys and heave buoys, one end of the connecting buoys of each branch is connected as a whole, and the other end radiates outward and connects to the heave buoys, the The central column is connected to the connection center of each connecting buoy, the peripheral column is connected to the heave buoy, and each branch forms a group of structures with the peripheral columns and support members installed on it, and each group of structures is independently set and connected to the said buoy. The central column is connected as a whole, and the adjacent structures are 120°rotationally symmetrical or symmetrical about the longitudinal section.

The present invention installs a floating body on the bottom of the peripheral column and the central column. The floating body is a Y-shaped structure with three branches, and each branch forms a group of structures with the peripheral columns and support members installed on it. Each group of structures After being installed independently, it is connected to the central column as a whole, and there is no connecting member between adjacent structures. At the same time, the adjacent structures are 120°rotationally symmetrical or symmetrical about the longitudinal section, and a ballast tank is provided to match the bottom of the central column. The ballast tank is used as the main ballast, which not only increases the strength of the overall structure of the present invention, can carry large-capacity wind turbines of 16MW and above, but also has a simple and compact overall structure, improves the stability of the floating body, and helps reduce the unit megawatt consumption of the floating wind turbine. The amount of steel saves construction costs.

In addition, the peripheral column of the present invention is installed obliquely outwards, and the peripheral column is divided into an upper section, a middle section, and a lower section along its height direction, and the cross-sectional area of the middle section is larger than that of the lower section, so that the middle section protrudes from the lower section, and the upper section is higher than that of the lower section. The waterline surface is set, the middle section is placed in the waterline surface, and the lower section is set below the waterline surface. In this way, not only the overall structure is a Y-shaped space structure with a narrow bottom and a wide top, which is convenient for transportation, installation and operation and maintenance. The area moment of the line surface increases with the increase of the draft, which effectively improves the stiffness of the waterline surface, effectively reduces the amplitude of the surge motion of the present invention, improves the effective power generation time, and increases the restoring moment at a certain inclination angle , which can compensate for the loss of drainage volume after a certain inclination angle, and improve the overall anti-overturning ability and stability performance.

Preferably, the inclination angle of the peripheral columns is 15-30°.

Preferably, the connecting buoy is a rectangular buoy, the heave buoy is a cylindrical buoy, and the upper surfaces of the connecting buoy and the heave buoy are set as a platform.

Preferably, the heave buoys have a diameter greater than the diameter of the peripheral columns.

Preferably, the support member includes an upper support member and a lower brace member.

Preferably, the middle section is connected to the upper section or the lower section through a transition section, and the cross-sectional area of the transition section has a gradually changing structure.

Preferably, the mooring chain is hung below the waterline of the middle section of the peripheral column.

Preferably, the lower part of the middle section is within 3-5 meters below the waterline, and the upper part of the middle section is within 3 meters above the waterline.

Preferably, the diameter of the middle section is 1.2-1.8 times the diameter of the upper section or the diameter of the lower section.

Preferably, the central column includes a first section, a second section, a third section and a fourth section arranged sequentially from top to bottom, the first section is a double-shell structure including an outer shell and an inner shell, and the outer shell The support member is connected, the upper end of the inner casing is connected to the fan tower, the lower end of the inner casing is connected to the upper end of the second section, and the lower end of the second section is telescopically connected to the upper end of the third section , the lower end of the third section is connected to the fourth section, and the external dimension of the fourth section is increased to form a buoy.

The present invention is mainly composed of a plurality of peripheral columns, a central column, a support member connecting the peripheral columns and the central column, and a bottom floating body, wherein the peripheral columns are installed on the bottom floating body obliquely outwards, and the peripheral columns are divided into upper and lower sections along the height direction. , middle and lower sections, the middle section of the peripheral column is near the waterline, and the cross-sectional area of the middle section of the peripheral column is larger than that of the lower section, and the middle section is connected to the upper and lower sections through the rounded structure of the transition section; the central column is vertical It is installed upwards, and its top is designed as a double-hull structure, and a large-capacity megawatt floating fan (16MW and above) is installed on the top. The third section of the lower part of the central column is set as a telescopic structure, and the fourth section The increased cross-sectional area is set as the main ballast tank; the bottom floating body and the central column are connected by a Y-shaped foundation base with three branches, and the angle between each branch is 120°, and the three toes of the floating body are designed as circular buoys as In the heave cabin, the peripheral columns on the bottom floating body and the central column are connected and supported by diagonal braces to maintain the overall structure stability and overall structural strength of the floating body.

The mooring system adopts the mooring cable arrangement scheme, the top mooring chain is installed and connected on the three peripheral columns that gradually slope outward and is below the waterline, the bottom mooring chain adopts the shared anchor scheme to connect to the seabed anchor pile, floating Corresponding anchor piles can be set according to the layout of the wind turbine foundation group, and the adjacent floating bodies can share the anchor pile foundation.

Compared with prior art, the beneficial effect of the present invention is:

(1) The foundation of the floating wind turbine provided by the present invention has high overall comprehensive performance, simple and compact structural layout, and higher structural utilization rate, which can effectively reduce the steel consumption per unit megawatt of the foundation of the floating wind turbine, and is simple in construction, low in cost, and economical Good sex;

(2) The support structure between the peripheral column and the central column of the present invention, and the Y-shaped structure that cooperates with the base floating body can ensure that the total strength of the floating body structure meets the specification requirements, and the entire floating body foundation can resist typhoons of the highest level and wave loads in water depths of 100 meters and above and mooring and other integrated load requirements;

(3) The large-diameter double-shell structure on the upper part of the central column of the present invention, the outer shell is convenient for the connection and welding of the support structure between the peripheral column and the central column, and the inner shell of the central column is continuously docked with the base of the fan tower, which is convenient to ensure the base of the fan tower the structural strength of the location;

(4) The peripheral column of the present invention is gradually inclined, so that the area moment of the water plane increases with the increase of the draft. When the floating foundation has a certain inclination angle, the restoring moment is larger than that of the vertically arranged peripheral column, which can Compensate for the lack of drainage volume after a certain inclination angle, which can improve the stability of the floating body and facilitate the adjustment of the draft according to the operation requirements during design;

(5) The increase of the local diameter of the upper and lower areas of the draft of the peripheral column of the present invention can gradually increase the drainage volume, thereby increasing the buoyancy, ensuring the normal operation of the fan, and adding additional buoyancy after the floating foundation has a certain inclination angle to ensure inclined power generation stability and thus improve power generation efficiency;

(6) The fan of the present invention is installed on the center column, and the ballast tank structure at the bottom of the center column can greatly reduce the center of gravity of the floating body, greatly improving the stability of the entire floating fan foundation;

(7) The present invention adopts the mooring cable arrangement scheme, and mooring schemes such as 3x1, 3x2, and 3x3 can be arranged according to actual needs. The mooring chains are installed and connected on three peripheral columns that are gradually inclined outward, and the connection points are on the waterline surface Below, it can reduce the corrosion of the mooring chain due to long-term exposure to the air, avoid collision with the bottom structure, facilitate installation and berthing installation, and combine with the shared anchor scheme to improve the efficiency of wind power generation and the economy of the platform;

(8) The center column structure below the floating body of the present invention is inserted into the center column above the floating body to facilitate batch dry dragging and installation of the floating fan foundation.

(9) The foundation of the floating wind turbine of the present invention can be widely used in deep sea areas such as the South China Sea and the East China Sea, which contributes to the development of my country's floating offshore wind power technology and promotes the design innovation of floating offshore wind power, especially for floating offshore wind turbines Basic design and research and development of large-capacity offshore wind turbines play a positive role in promoting.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the system of the foundation of the floating wind turbine suitable for installation in deep and open seas according to the present invention.

Fig. 2 is a side view of the foundation of the floating wind turbine suitable for installation in deep and open seas according to the present invention.

Fig. 3 is an axonometric view of the foundation of the floating wind turbine suitable for installation in deep and open seas according to the present invention.

Fig. 4 is a schematic diagram of the foundation of the floating wind turbine suitable for installation in deep and open sea according to the present invention before it is launched.

Fig. 5 is a schematic diagram of batch dry towing of floating wind turbine foundations according to the present invention, which is suitable for installation in deep and open seas.

In the picture:

1--tower;

2--peripheral column, 2-1--upper section, 2-4--lower section, 2-2--transition section, 2-3--middle section;

3--center column, 3-1--first section, 3-2--second section, 3-3--third section, 3-4--fourth section;

4--pontoon, 4-1--connecting buoy, 4-2--swing buoy;

5--supporting member, 5-1--upper supporting member, 5-2--lower diagonal bracing member;

6--mooring chain;

7--Semi-submersible transport ship.

Detailed ways

The present invention will be further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

For the convenience of description, the relative positional relationship of each component, such as: the description of up, down, left, right, etc., is described according to the layout direction of the drawings in the specification, and does not limit the structure of this patent.

As shown in Figures 1 to 3, an embodiment of the floating wind turbine foundation suitable for installation in deep and open seas of the present invention includes three peripheral columns 2 of the same size, a central column 3, a floating body 4 as the base of the peripheral column 2, and a supporting member 5 , mooring chain 6, three peripheral columns 2 are evenly installed on the periphery of the central column 3 through the support member 5, the upper end of the central column 3 is connected with the tower tube 1 with a large-capacity fan, and each peripheral column 2 is connected to the mooring chain 6, and ballast tanks are respectively arranged in the peripheral column 2, the central column 3, and the floating body 4, thus forming an offshore floating wind turbine installation platform.

The peripheral column 2 of the present embodiment is all inclined outwards, and the inclination angle is 15-30°, and the peripheral column 2 is divided into an upper section 2-1, a middle section 2-3 and a lower section 2-4 along its height direction, and the upper section 2-1 is connected with the lower section 2-4. The diameter of the lower section 2-4 is the same, and the diameter of the middle section 2-3 is larger than that of the upper section 2-1 or the lower section 2-4. Preferably, the diameter of the middle section 2-3 is 1.2-1.8 times the diameter of the upper section 2-1 and the lower section 2-4, and the middle section 2-3 is respectively connected to the upper section 2-1 and the lower section 2-4 through a transition section 2-2 with a gradually changing diameter. connect. When the present invention is in use, the upper section 2-1 of the peripheral column 2 is set higher than the waterline, the lower end of the middle section 2-3 is within the range of 3-5 meters below the waterline, and the upper end of the middle section 2-3 is 3 meters above the waterline. In the range of more than one meter, the lower section 2-4 is set lower than the waterline surface, so that when the foundation of the floating fan is tilted, the drainage volume after its draft rises will increase, and its stability and power generation efficiency will be improved. In addition, the mooring chain 6 of the present invention is hung on the part below the waterline of the middle section 2-3 of the peripheral column 2, which is convenient for strengthening the structure of the mooring chain suspension.

The central column 3 of this embodiment includes a first section 3-1, a second section 3-2, a third section 3-3 and a fourth section 3-4 which are sequentially connected from top to bottom. The first section 3 - 1 and the second section 3 - 2 are located above the floating body 4 , and the third section 3 - 3 and the fourth section 3 - 4 are located below the floating body 4 . The first section 3 - 1 is a double-shell structure including an outer shell and an inner shell, the outer shell is connected to the support member 5 , and the upper end of the inner shell is connected to the wind tower 1 . The diameter of the outer shell is more than 3 meters larger than the diameter of the inner shell, that is, there is at least a 1.5-meter wide space between the inner shell and the outer shell, so that the support member 5 can be welded between the outer shell of the peripheral column 2 and the central column 3 . In order to facilitate the welding of the inner shell and the fan tower 1, the diameter of the inner shell is the same as that of the fan tower 1. The central column 3 of the present invention adopts a double-shell structure to realize the installation of the support member 5 and the fan tower 1, which can provide sufficient structural reinforcement and ensure the structural strength of the fan tower base. Also to simplify the connection, in this embodiment, the inner shell and the second section 3-2 are integrated, and the inner shell and the second section 3-2 have the same diameter. In order to facilitate the towing transportation of the floating wind turbine foundation, the lower end of the second section 3-2 is telescopically connected to the upper end of the third section 3-3. In this embodiment, the diameter of the third section 3-3 is smaller than the diameter of the second section 3-2, so that the upper end of the third section 3-3 can be pre-inserted into the second section 3 using a mechanical connection structure during towing transportation. -2, after being transported to the working place, the third section 3-3 is gradually slid down to the corresponding position through the mechanical connection structure. Ballast tanks are set inside the third section 3-3, and the diameter of the fourth section 3-4 increases to form a large-diameter buoy, and the ballast content and ballast volume of the ballast tank and buoy can be adjusted according to the working water depth requirements, To control the center of gravity of the entire floating body, thereby greatly reducing the center of gravity of the floating body, which is beneficial to the stability of the foundation of the entire floating fan and reduces the motion response of the floating body.

The floating body 4 of the present embodiment is installed horizontally at the bottom of the second section 3-2 of the central column 3, and the middle part of the floating body 4 is connected to the central column 3, and the periphery of the floating body 4 extends to the peripheral column 2. bottom. The floating body 4 is a Y-shaped structure with three branches, each branch has the same structure, and the angle between adjacent branches is 120°. The branches include a connecting buoy 4-1 and a heave buoy 4-2, one end of each branch connecting the buoy 4-1 is connected as a whole, and the other end radiates outward and connects to the heave buoy 4-2, three peripheral The bottom of the column 2 is respectively connected with a heave buoy 4-2, and the central column 3 is connected with the connection center of each connection buoy 4-1. The connection buoy 4-1 is a rectangular buoy, the heave buoy 4-2 is a cylindrical buoy, and the upper surface of the connection buoy 4-1 and the heave buoy 4-2 is set as a platform, which is convenient for installation Peripheral column 2, and can be used as a working platform during operation and maintenance. In order to reduce the surge amplitude, the diameter of the heave buoy 4 - 2 is larger than the diameter of the peripheral column 2 .

A permanent ballast tank is designed inside the floating body 4, and the ballast tanks provided in the third section 3-3 and the fourth section 3-4 of the central column 3 are used as the main source of stability control of the floating body. A ballast tank is also arranged in the peripheral column 2 as an auxiliary ballast adjustment.

Each branch forms a group of structures with the peripheral columns 2 and support members 5 installed thereon. Each group of structures is independently arranged and connected to the central column 3. The adjacent groups of structures are 120°rotationally symmetrical or about which The longitudinal section is symmetrical. That is, the present invention connects the peripheral column 2 and the central column 3 into a whole by the floating body 4 and the support member 5, and the peripheral column 2 is not only connected to the deck of the floating body 4, but also stretches into the inside of the floating body 4 and is connected with the bottom plate of the floating body 4. The overall structural strength of the present invention is improved, thereby providing structural support for carrying large-capacity wind turbines of 16MW and above.

The supporting member 5 of this embodiment is composed of an upper supporting member 5-1 and a lower diagonal bracing member 5-2, and the upper supporting member 5-1 is horizontally arranged on the upper section 2-1 of the peripheral column 2 and the first section 3 of the central column 3 -1 between the shells, the lower brace member 5-2 is obliquely arranged between the lower section 2-4 of the peripheral column 2 and the shell of the first section 3-1 of the central column 3, wherein the upper support member 5-1 and the lower The number of diagonal bracing members 5-2 increases according to the requirements of the overall strength of the structure, and the supporting form will also change accordingly. In this way, connecting the central column 3 and the peripheral column 2 with the supporting member 5 can improve the stability of the fan tower base on the central column 3, reduce the response of the fan vibration to the floating body structure, and fully ensure the strength requirements of the entire floating body structure.

In this embodiment, the floating wind turbine base floating body suitable for deep sea installation adopts a 3x2 (or 3x1, 3x3, etc.) mooring arrangement scheme, and the mooring chain 6 is hung on the middle section 2-3 of the peripheral column 2 and is located below the waterline. It can reduce the corrosion of the mooring chain due to long-term exposure to the air, and the inclined peripheral column 2 can avoid the collision contact between the mooring chain 6 and the floating body 4, so as to ensure the mooring installation at the installation place. In addition, the middle section 2-3 of the peripheral column 2 can have sufficient structural reinforcement space below the waterline, so as to meet the local strength requirements of the mooring chain 6 for the structure.

In terms of foundation construction, transportation and installation of the floating wind turbine suitable for installation in deep and open seas in this embodiment, the peripheral column 2, the central column 3, the buoy 4, and the supporting member 5 can be constructed in sections, and the third section 3 of the central column 3- 3. After the construction of the fourth section 3-4 is completed, first insert the buoy 4 through the mechanical connection device, as shown in Figure 4, and then take the bottom buoy 4 as the benchmark, and gradually install the peripheral column 2, the first section 3- 1, the second section 3-2, the supporting member 5 and so on are closed. After the whole body is launched, the third section 3-3 and the fourth section 3-4 of the central column 3 are slid down through the mechanical device to cooperate with the ballast to carry out the whole ship tilting test. Finally, the whole floating body that has been assembled can be transported to the installation dock to install the complete machine of the fan tower 1. The floating body can be dry towed with a semi-submersible transport ship 7 in batches as shown in Figure 5, or the floating body as shown in Figure 4 Wet tow the floating body to the installation dock to install the wind tower 1. After that, use the bottom floating body 4 and the lower half of the column 3 3-3, 3-4 as the main ballast, and the inside of the peripheral column 2 as auxiliary ballast to the entire The draft of the floating wind turbine platform system is towed, and the entire floating wind turbine platform system is wet towed to the working sea area, and according to the draft conditions of the working sea area, the third section 3-3 and the fourth section 3-4 of the central column 3 are lowered to Corresponding position, and configure the ballast draft according to the stability calculation requirements, and carry out mooring positioning installation with the shared anchor system installed in advance, and then complete the in-place installation of the entire floating fan system.

The floating wind turbine foundation of the present invention is suitable for installation in deep seas with an average water depth of 100 meters and above. It is an economical semi-submersible offshore floating wind turbine foundation. Equipped with large-capacity wind turbines of 16MW and above, strong anti-overturning ability, good stability, and structural strength to meet the integrated design requirements of wind turbine aerodynamics-hydrodynamics-mooring, etc., steel structure with low weight per MW, high power generation efficiency, and good economy, etc. performance.

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can utilize the technology disclosed above without departing from the scope of the technical solution of the present invention. Contents Many possible changes and modifications are made to the technical solution of the present invention, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A floating wind turbine foundation suitable for installation in deep and open seas, comprising a plurality of peripheral columns (2), a central column (3), support members (5) and mooring chains (6), the peripheral of the central column The peripheral column is connected through the support member, characterized in that: The peripheral column is installed obliquely outward, and the peripheral column is divided into an upper section (2-1), a middle section (2-3) and a lower section (2-4) along its height direction, and the cross-sectional area of the middle section is larger than the The cross-sectional area of the lower section, the upper section is set higher than the waterline, the middle section is placed in the waterline, and the lower section is set lower than the waterline; The bottom of each peripheral column is installed on a floating body (4) with a ballast tank inside, the floating body is placed horizontally, and the center of the floating body is vertically cross-connected with the central column; The buoyant body is a Y-shaped structure with three branches, and the branches include connecting buoys (4-1) and heave buoys (4-2). The heave buoys are connected, the central column is connected to the connection center of each connected buoy, the peripheral column is connected to the heave buoys, and each branch forms a group of structures with the peripheral columns and support members installed on it. Groups of structures are arranged independently and are integrated with the central column, and adjacent groups of structures are 120° rotationally symmetrical or symmetrical about their longitudinal sections. 2. The floating wind turbine foundation suitable for deep sea installation according to claim 1, characterized in that, the inclination angle of the peripheral columns is 15-30°. 3. The floating wind turbine foundation suitable for deep and open sea installation according to claim 1, characterized in that, the connecting buoy is a rectangular buoy, the heave buoy is a cylindrical buoy, and the connecting buoy and the vertical The upper surface of the buoy is set as a platform. 4. The floating wind turbine foundation suitable for deep sea installation according to claim 3, characterized in that, the diameter of the heave buoy is larger than the diameter of the peripheral column. 5. The floating wind turbine foundation suitable for installation in deep sea according to claim 1, characterized in that, the support members include an upper support member (5-1) and a lower brace member (5-2). 6. The floating wind turbine foundation suitable for deep sea installation according to claim 1, characterized in that, the middle section is connected to the upper section or the lower section through a transition section, and the cross-sectional area of the transition section is gradient structure. 7. The floating wind turbine foundation suitable for installation in deep and open seas according to claim 1, wherein the mooring chains are hung below the waterline surface of the middle section of the peripheral column. 8. The floating wind turbine foundation suitable for deep sea installation according to claim 1, characterized in that, the lower part of the middle section is within 3-5 meters below the waterline, and the upper part of the middle section is above the waterline within 3 meters. 9. The floating wind turbine foundation suitable for deep sea installation according to claim 1, wherein the diameter of the middle section is 1.2-1.8 times the diameter of the upper section or the diameter of the lower section. 10. The floating wind turbine foundation suitable for deep sea installation according to claim 1, characterized in that, the central column includes the first section, the second section, the third section and the fourth section arranged sequentially from top to bottom , the first section is a double-shell structure including an outer shell and an inner shell, the outer shell is connected to the support member, the upper end of the inner shell is connected to the fan tower, and the lower end of the inner shell is connected to the second section The upper end, the lower end of the second section is telescopically connected to the upper end of the third section, the lower end of the third section is connected to the fourth section, and the outer dimension of the fourth section increases to form a buoy.

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