A floating wind turbine installation auxiliary device and installation method

Abstract

The present invention belongs to the field of offshore wind power generation technology and discloses a floating wind turbine installation auxiliary device and installation method. The floating wind turbine installation auxiliary device includes a counterweight body, a water delivery device, and an auxiliary support member. The counterweight body is connected to the end of the tower away from the wind turbine body and has a ballast water tank. The water delivery device includes a main pipe, a water delivery pump, a branch pipe, and a first valve. The water delivery pump is installed on the main pipe, and the two ends of the branch pipe connect the main pipe and the ballast water tank. The auxiliary support assembly includes a support column, a first tension cable, and a second tension cable. The support column is protruding from one side of the counterweight body. The two ends of the first tension cable respectively connect the support column and the counterweight body to form a diagonal structure. The two ends of the second tension cable respectively connect the support column and the tower to form a diagonal structure. The floating wind turbine installation method uses the above-mentioned auxiliary device. The device can adjust the tower of the floating wind turbine to a vertical position without the need for additional auxiliary lifting equipment, effectively ensuring the efficiency, economy, and safety of offshore construction operations.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and in particular to a floating wind turbine installation auxiliary device and an installation method. Background Art

[0002] Floating wind turbines are essential marine equipment for developing deep-sea wind resources and are widely used in deep-sea wind energy development. However, due to the harsh climatic conditions in deep-sea waters, the safety and efficiency of floating wind turbine installation operations are key challenges in offshore construction.

[0003] In existing technology, the tower and turbine body of a floating wind turbine are typically assembled on land and then transported to the seashore. With the tower lying flat on sea level, it is towed to the target offshore location via a shipping vessel or other equipment. The tower is then lifted and adjusted to a vertical position using a crane vessel or other equipment, and the floating wind turbine is then secured by installing counterweights and other steps. This requires auxiliary lifting equipment such as a crane vessel to be deployed in the target sea area to lift the tower. This consumes significant manpower and material resources, resulting in low installation efficiency and high costs. Furthermore, the complex offshore environment also impacts the safety of both operators and vessels. Summary of the Invention

[0004] The purpose of the present invention is to provide a floating wind turbine installation auxiliary device with a simple structure. When assembled on a floating wind turbine, the floating wind turbine tower can be adjusted to a vertical posture at a target point at sea without the need for additional auxiliary lifting devices, thereby achieving efficient installation at an offshore work point, effectively ensuring the efficiency, economy and safety of offshore construction operations of the floating wind turbine, and reducing installation operation costs.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A floating wind turbine installation auxiliary device is installed on a floating wind turbine, wherein the floating wind turbine includes a tower and a wind turbine body. The floating wind turbine installation auxiliary device includes:

[0007] A counterweight body, the counterweight body being connected to an end of the tower away from the wind turbine body, and the counterweight body having a ballast water tank therein;

[0008] a water delivery device, comprising a main pipe, a water delivery pump, a branch pipe, and a first valve, wherein the water delivery pump is disposed on the main pipe, the branch pipe is disposed corresponding to the ballast water tank, a first end of the branch pipe is connected to the main pipe, and a second end of the branch pipe is connected to the ballast water tank, and the first valve is disposed on the branch pipe;

[0009] An auxiliary support assembly includes a support column, a first tension cable and a second tension cable. The support column is protruded on one side of the counterweight body. The two ends of the first tension cable are respectively connected to the support column and the counterweight body to form a cable-stayed structure. The two ends of the second tension cable are respectively connected to the support column and the tower to form a cable-stayed structure.

[0010] Preferably, a plurality of independent ballast water tanks are provided in the counterweight body, a plurality of branch pipes are provided, and the plurality of branch pipes correspond one-to-one to the ballast water tanks, and each branch pipe is provided with the first valve.

[0011] Preferably, four of the ballast water tanks, four of the branch pipes and four of the first valves are provided in a one-to-one correspondence.

[0012] Preferably, a plurality of the first pulling rope and a plurality of the second pulling rope are provided.

[0013] Preferably, the water transfer device further includes a manifold, a first connecting pipe and a second valve, the end of the branch pipe away from the ballast water tank is connected to the manifold, the first end of the first connecting pipe is connected to the manifold, the second end of the first connecting pipe is connected to the main pipe and is located at the water outlet end of the water transfer pump, and the second valve is arranged on the first connecting pipe.

[0014] Preferably, the water delivery device further includes a second connecting pipe and a third valve, the first end of the second connecting pipe being connected to the manifold, the second end of the second connecting pipe being connected to the main pipe and being located at the water inlet end of the water delivery pump, and the third valve being arranged on the second connecting pipe.

[0015] Preferably, the water delivery device further includes a fourth valve, which is provided on the main pipe, and the second connecting pipe is connected to the main pipe between the fourth valve and the water delivery pump.

[0016] Preferably, the device further comprises a rotation adjusting member connected between the counterweight body and the tower, wherein the rotation adjusting member can enable the counterweight body to rotate axially relative to the tower.

[0017] Preferably, the pulling rope is configured as a metal chain.

[0018] The present invention also provides a floating wind turbine installation method, which uses the above-mentioned floating wind turbine installation auxiliary device to enable the tower of the floating wind turbine to automatically adjust to a vertical posture at the target point at sea. Installation can be achieved at the offshore work point without the need for additional auxiliary lifting equipment, effectively ensuring the efficiency, economy and safety of the offshore construction operation of the floating wind turbine and reducing the cost of installation operations.

[0019] A floating wind turbine installation method, using any of the above-mentioned floating wind turbine installation auxiliary devices, the floating wind turbine installation method mainly comprising the following steps:

[0020] S100, completing the assembly of the floating wind turbine and the floating wind turbine installation auxiliary device on land;

[0021] S200, towing the tower in a horizontal posture to a target point at sea;

[0022] S300, placing the main pipe in seawater, opening the first valve, and operating the water pump to pump seawater into the ballast water tank through the main pipe and the branch pipe. Under the action of the gravity of the seawater in the ballast water tank, the end of the tower on which the wind turbine body is mounted is gradually lifted upward;

[0023] S400: When the tower is lifted to a vertical position, the first valve is closed and the water pump stops working, so that the tower remains in a vertical position.

[0024] Beneficial effects:

[0025] The present invention provides a floating wind turbine installation auxiliary device in which a counterweight body is connected to the end of the tower away from the wind turbine body. When the floating wind turbine is towed to the target offshore location, the main pipe is placed in seawater, the first valve is opened, and the water pump is activated, pumping seawater through the main pipe and branch pipes into the ballast water tank. As more and more seawater enters the ballast water tank, the gravity of the seawater in the ballast water tank presses down on the end of the tower away from the wind turbine body, causing the end of the tower equipped with the wind turbine body to gradually rise upward and away from sea level, that is, the tower gradually stands upright. When the tower is raised to a vertical position, the first valve is closed, retaining the seawater in the ballast water tank, and the water pump is stopped, maintaining the tower in a vertical position, thus completing the tower standing action. In this process, the floating wind turbine tower can be adjusted to a vertical position at the target offshore location without the need for additional auxiliary lifting equipment, enabling efficient installation at the offshore work site. Moreover, the inclined structure formed by the support column, the first tension cable and the second tension cable can effectively ensure the safety of the force and deformation between the tower and the counterweight body during the lifting process of the floating wind turbine.

[0026] The floating wind turbine installation method provided by the present invention uses the above-mentioned floating wind turbine installation auxiliary device. The tower of the floating wind turbine can be adjusted to a vertical posture at the target point at sea without the need for additional auxiliary lifting devices, effectively ensuring the efficiency, economy and safety of the offshore construction operation of the floating wind turbine and reducing the installation operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a partial structural diagram of the floating wind turbine installation auxiliary device provided by the present invention;

[0028] Figure 2 This is another structural schematic diagram of the floating wind turbine installation auxiliary device provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the floating wind turbine provided by the present invention in a vertical position in seawater;

[0030] Figure 4 It is a flow chart of the floating wind turbine installation method provided by the present invention.

[0031] In the picture:

[0032] 1. Counterweight body; 11. Ballast water tank;

[0033] 2. Water delivery device; 21. Main pipe; 22. Water delivery pump; 23. Branch pipe; 24. First valve; 25. Manifold; 26. First connecting pipe; 27. Second valve; 28. Second connecting pipe; 29. ​​Third valve; 210. Fourth valve;

[0034] 3. Auxiliary support assembly; 31. Support column; 32. First pull rope; 33. Second pull rope;

[0035] 4. Turn the adjustment piece;

[0036] 5. Floating wind turbine; 51. Tower; 52. Wind turbine body;

[0037] 61. Counterweight; 62. Traction piece. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0042] This embodiment provides a floating wind turbine 5 installation auxiliary device. Figures 1 to 3 As shown, the device is installed on a floating wind turbine 5 , which includes a tower 51 and a wind turbine body 52 .

[0043] The specific structures of the tower 51 and the wind turbine body 52 of the floating wind turbine 5 are prior art and will not be described in detail here.

[0044] The auxiliary installation device for the floating wind turbine 5 includes a counterweight body 1, a water delivery device 2, and auxiliary supports. The counterweight body 1 is connected to the end of the tower 51 away from the wind turbine body 52. ​​The counterweight body 1 contains a ballast water tank 11. The water delivery device 2 includes a main pipe 21, a water delivery pump 22, a branch pipe 23, and a first valve 24. The water delivery pump 22 is mounted on the main pipe 21. The branch pipe 23 is located corresponding to the ballast water tank 11. The first end of the branch pipe 23 is connected to the main pipe 21, and the second end of the branch pipe 23 is connected to the ballast water tank 11. The first valve 24 is mounted on the branch pipe 23. The auxiliary support assembly 3 includes a support column 31, a first tension cable 32, and a second tension cable 33. The support column 31 protrudes from one side of the counterweight body 1. The two ends of the first tension cable 32 respectively connect the support column 31 and the counterweight body 1 to form a cable-stayed structure. The two ends of the second tension cable 33 respectively connect the support column 31 and the tower 51 to form a cable-stayed structure.

[0045] In this embodiment, when the floating wind turbine 5 is towed to the target offshore location, the main pipe 21 is placed in seawater, the first valve 24 is opened, and the water pump 22 is activated, pumping seawater through the main pipe 21 and branch pipe 23 into the ballast tank 11. As more seawater enters the ballast tank 11, the weight of the seawater in the ballast tank 11 presses down on the end of the tower 51 away from the turbine body, causing the end of the tower 51 housing the turbine body to gradually rise upward and away from sea level, effectively raising the tower 51. When the tower 51 reaches a vertical position, the first valve 24 is closed, retaining the seawater in the ballast tank 11, and the water pump 22 is deactivated, maintaining the tower 51 in a vertical position, thus completing the tower 51's vertical position. During this process, the tower 51 of the floating wind turbine 5 can be adjusted to a vertical position at the target offshore location without the need for additional auxiliary lifting equipment, enabling efficient installation at the offshore work site. Furthermore, the inclined structure formed by the support column 31 , the first pulling cable 32 and the second pulling cable 33 can effectively ensure the safety of the stress and deformation between the tower 51 and the counterweight body 1 during the lifting process of the floating wind turbine 5 .

[0046] In this embodiment, a plurality of the first pulling ropes 32 and the second pulling ropes 33 are provided. The number of the first pulling ropes 32 and the second pulling ropes 33 can be adaptively adjusted according to actual needs and is not limited here.

[0047] The connection between the first tensioning cable 32 and the support column 31 and the counterweight body 1 can be achieved by conventional methods such as fixed plug-in connection and lock connection, which will not be described in detail here. The connection between the second tensioning cable 33 and the support column 31 and the tower 51 can be achieved by conventional methods such as fixed plug-in connection and lock connection, which will not be described in detail here.

[0048] In this embodiment, the first and second pull cables 32 and 33 are both configured as metal chains. Specifically, they can be configured as stainless steel chains. Optionally, the first and second pull cables 32 and 33 can be coated with an anti-rust layer to prevent corrosion from seawater.

[0049] In this embodiment, the counterweight body 1 is provided with multiple independent ballast water tanks 11. Multiple branch pipes 23 are provided, each corresponding to a ballast water tank 11. Each branch pipe 23 is provided with a first valve 24. By providing multiple ballast water tanks 11, water can be selectively added to different numbers of ballast water tanks 11 according to the weight of the floating wind turbine 5, adapting to different models of floating wind turbines 5, further ensuring its applicability and ensuring compatibility.

[0050] Preferably, four ballast water tanks 11, branch pipes 23 and first valves 24 are provided in a one-to-one correspondence.

[0051] Furthermore, the water transfer device 2 also includes a manifold 25, a first connecting pipe 26, and a second valve 27. The ends of the branch pipes 23 distal from the ballast water tanks 11 are connected to the manifold 25. The first ends of the first connecting pipes 26 are connected to the manifold 25, and the second ends of the first connecting pipes 26 are connected to the main pipe 21 and located at the outlet of the water transfer pump 22. The second valve 27 is disposed on the first connecting pipe 26. Specifically, in this embodiment, the plurality of branch pipes 23 are all connected to the manifold 25. When water filling is required, the second valve 27 is opened to open the first connecting pipe 26, and the first valve 24 on the branch pipe 23 corresponding to the ballast water tank 11 to be filled is opened. The water transfer pump 22 is activated, and seawater enters the corresponding ballast water tank 11 in sequence through the main pipe 21, the first connecting pipe 26, the manifold 25, and the branch pipes 23.

[0052] Furthermore, the water transfer device 2 includes a second connecting pipe 28 and a third valve 29. The first end of the second connecting pipe 28 is connected to the manifold 25, and the second end of the second connecting pipe 28 is connected to the main pipe 21 and is located at the water inlet of the water transfer pump 22. The third valve 29 is disposed on the second connecting pipe 28. Specifically, when the floating wind turbine 5 needs to be repositioned, the water in the ballast tank 11 needs to be drained so that the floating wind turbine 5 can lie flat on the sea surface again for towing by a towing vessel. At this time, the third valve 29 is opened to open the second connecting pipe 28, and the first valve 24 on the branch pipe 23 corresponding to the ballast tank 11 to be drained is opened. The seawater in the ballast tank 11 can then be discharged back into the sea through the branch pipe 23, the return pipe, the second connecting pipe 28, and the main pipe 21.

[0053] Optionally, a drainage pump (not shown) is provided on the second connecting pipe 28. When drainage is required, the drainage pump works to discharge seawater from the ballast water tank 11 more reliably and effectively.

[0054] It is worth mentioning that when water injection is required, the third valve 29 needs to be closed to prevent seawater from flowing back from the second connecting pipe 28 .

[0055] Furthermore, the water delivery device 2 further includes a fourth valve 210, which is provided on the main pipe 21, and the second connecting pipe 28 is connected to the main pipe 21 between the fourth valve 210 and the water delivery pump 22. The fourth valve 210 is provided to control the on-off of the main pipe 21.

[0056] In this embodiment, the auxiliary installation device for the floating wind turbine 5 further includes a rotational adjustment member 4 connected between the counterweight body 1 and the tower 51. The rotational adjustment member 4 enables the counterweight body 1 to rotate axially relative to the tower 51. The rotational adjustment member 4 allows the tower 51 to be positioned relative to the counterweight body 1 at sea level, ensuring that the center of gravity of the floating wind turbine 5 remains balanced during towing and lifting at sea.

[0057] Optionally, the rotation adjustment member 4 includes a first rotation adjustment part and a second rotation adjustment part (the first rotation adjustment part and the second rotation adjustment part are not shown), the first rotation adjustment part is fixed on the counterweight body 1, the second rotation adjustment part is fixed on the tower 51, and the second rotation adjustment part is rotatably connected to the second rotation adjustment part.

[0058] Optionally, the first rotation adjustment part and the second rotation adjustment part can be rotationally connected via a bearing structure.

[0059] It is worth mentioning that the opening and closing control of the above-mentioned valves and the start and stop control of the pump can be achieved through existing control elements, which will not be elaborated here.

[0060] For example, referring to Figures 1 to 4 As shown, this embodiment also provides a method for installing a floating wind turbine 5 , which is applied to the above-mentioned auxiliary device for installing the floating wind turbine 5 .

[0061] The installation method of the floating wind turbine 5 mainly includes the following steps:

[0062] S100 , completing the assembly of the floating wind turbine 5 and the floating wind turbine 5 installation auxiliary device on land.

[0063] Specifically, the assembly of the floating wind turbine 5 and the auxiliary device for mounting the floating wind turbine 5 involves the installation of the counterweight body 1 and the tower 51. The counterweight body 1 and the tower 51 are connected by a rotary adjustment member, which enables axial rotation of the tower 51 relative to the counterweight body 1.

[0064] S200: Towing the tower 51 to a target location at sea.

[0065] Specifically, the floating wind turbine 5 is towed to a target location at sea by a shipping vessel or other equipment with the tower 51 lying flat on the sea surface.

[0066] S300, place the main pipe 21 in seawater, open the first valve 24, start the water pump 22, and let the seawater enter the ballast water tank 11 through the main pipe 21 and the branch pipe 23. Under the action of the gravity of the seawater in the ballast water tank 11, the end of the tower 51 where the fan body 52 is installed is gradually lifted upward.

[0067] Specifically in this embodiment, when water injection is required, the first valve 24 on the branch pipe 23 corresponding to the ballast water tank 11 that needs to be injected is opened, and the second valve 27 and the fourth valve 210 are opened, the third valve 29 is closed, and the water delivery pump 22 is controlled to work. Seawater enters the corresponding ballast water tank 11 through the main pipe 21, the first connecting pipe 26, the manifold 25, and the branch pipe 23 in sequence. As more and more seawater enters the ballast water tank 11, the gravity of the seawater in the ballast water tank 11 can press down the tower 51 away from one end of the wind turbine body, so that the end of the tower 51 where the wind turbine body is provided is gradually lifted upward and away from the sea level, that is, the tower 51 gradually stands up.

[0068] S400 , when the tower 51 is lifted to a vertical position, the first valve 24 is closed and the water delivery pump 22 stops working, so that the tower 51 remains in a vertical position.

[0069] Specifically in this embodiment, when the tower 51 is lifted to a vertical position, the first valve 24, the second valve 27, the third valve 29, and the third valve 29 are all closed, and the water delivery pump 22 is stopped, and the seawater is retained in the ballast water tank 11. The tower 51 will remain in a vertical position, thereby completing the standing action of the tower 51.

[0070] After tower 51 completes its upright position, floating wind turbine 5 can be positioned relative to the target location by attaching a counterweight 61 to tower 51 via a traction member 62. Specifically, traction member 62 is configured as a metal chain, one end of which is connected to tower 51 and the other end to counterweight 61. Counterweight 61 can be sunk into the sea, thereby pulling floating wind turbine 5 and reliably maintaining it at the target location offshore.

[0071] The above method uses an auxiliary device for installing the floating wind turbine 5. The tower 51 of the floating wind turbine 5 can be adjusted to a vertical posture at the target point at sea without the need for additional auxiliary lifting equipment, effectively ensuring the efficiency, economy and safety of the offshore construction operation of the floating wind turbine 5 and reducing the cost of installation operations.

[0072] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A floating wind turbine installation auxiliary device, installed on a floating wind turbine (5), wherein the floating wind turbine (5) comprises a tower (51) and a wind turbine body (52), characterized in that: The floating wind turbine installation auxiliary device includes: A counterweight body (1), the counterweight body (1) being connected to an end of the tower (51) away from the wind turbine body (52), and the counterweight body (1) having a ballast water tank (11) therein; A water delivery device (2) comprises a main pipe (21), a water delivery pump (22), a branch pipe (23) and a first valve (24), wherein the water delivery pump (22) is arranged on the main pipe (21), the branch pipe (23) is arranged corresponding to the ballast water tank (11), a first end of the branch pipe (23) is connected to the main pipe (21), and a second end of the branch pipe (23) is connected to the ballast water tank (11), and the first valve (24) is arranged on the branch pipe (23); An auxiliary support assembly (3) comprises a support column (31), a first tension cable (32) and a second tension cable (33), wherein the support column (31) is protrudingly arranged on one side of the counterweight body (1), the two ends of the first tension cable (32) are respectively connected to the support column (31) and the counterweight body (1) to form an oblique-stayed structure, and the two ends of the second tension cable (33) are respectively connected to the support column (31) and the tower (51) to form an oblique-stayed structure; The water delivery device (2) further comprises a manifold (25), a first connecting pipe (26) and a second valve (27); one end of the branch pipe (23) away from the ballast water tank (11) is connected to the manifold (25); a first end of the first connecting pipe (26) is connected to the manifold (25); a second end of the first connecting pipe (26) is connected to the main pipe (21) and is located at the water outlet of the water delivery pump (22); and the second valve (27) is provided on the first connecting pipe (26); The water delivery device (2) further comprises a second connecting pipe (28) and a third valve (29), wherein a first end of the second connecting pipe (28) is connected to the manifold (25), a second end of the second connecting pipe (28) is connected to the main pipe (21) and is located at the water inlet end of the water delivery pump (22), and the third valve (29) is provided on the second connecting pipe (28); It also includes a rotation adjustment member (4) connected between the counterweight body (1) and the tower (51), wherein the rotation adjustment member (4) can enable the counterweight body (1) to rotate axially relative to the tower (51).

2. The floating wind turbine installation auxiliary device according to claim 1, characterized in that: A plurality of mutually independent ballast water tanks (11) are provided in the counterweight body (1), a plurality of branch pipes (23) are provided, the plurality of branch pipes (23) correspond one-to-one to the ballast water tanks (11), and each branch pipe (23) is provided with the first valve (24).

3. The floating wind turbine installation auxiliary device according to claim 2, characterized in that: The ballast water tank (11), the branch pipe (23) and the first valve (24) are provided in four in a one-to-one correspondence.

4. The floating wind turbine installation auxiliary device according to claim 1, characterized in that: A plurality of the first pulling rope (32) and the second pulling rope (33) are provided.

5. The floating wind turbine installation auxiliary device according to claim 1, characterized in that: The water delivery device (2) further comprises a fourth valve (210), wherein the fourth valve (210) is arranged on the main pipe (21), and the second connecting pipe (28) is connected to the main pipe (21) between the fourth valve (210) and the water delivery pump (22).

6. The floating wind turbine installation auxiliary device according to claim 1, characterized in that: The first pulling rope (32) and the second pulling rope (33) are both configured as metal chains.

7. A floating wind turbine installation method, characterized in that: The floating wind turbine installation auxiliary device according to any one of claims 1 to 6 is applied, and the floating wind turbine installation method mainly comprises the following steps: S100, completing the assembly of the floating wind turbine (5) and the floating wind turbine installation auxiliary device on land; S200, towing the tower (51) to a target location at sea; S300, placing the main pipe (21) in seawater, opening the first valve (24), and operating the water delivery pump (22) to allow the seawater to enter the ballast water tank (11) through the main pipe (21) and the branch pipe (23), so that the end of the tower (51) where the fan body (52) is arranged is gradually lifted upward under the action of the gravity of the seawater in the ballast water tank (11); S400: When the tower (51) is lifted to a vertical posture, the first valve (24) is closed, and the water delivery pump (22) stops working, so that the tower (51) remains in a vertical posture.

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