Tension leg type wind wave coupling power generation foundation

Abstract

The utility model discloses a tension leg type wind wave coupling power generation foundation which comprises a stand column used for installing a wind turbine generator and a fan tower drum, the stand column is fixed to a frame, a buoy is fixed to the bottom of the frame and is moored through tension tendons, the tension leg type wind wave coupling power generation foundation comprises an oscillating floater, and a pulling rope is arranged on the buoy to pull the oscillating floater. A winch, a generator, a storage battery and a motor are arranged in the buoy, the lower end of the traction rope is wound around the winch, the generator and the motor are in transmission connection with the winch, and the storage battery is electrically connected with the generator and the motor. The problem that an offshore power generation platform adopting a floating structure to capture wave energy transmits an overhigh load to the power generation platform under an extreme sea condition to affect safety is solved.

Description

Technical Field

[0001] This utility model relates to the field of offshore power generation foundation technology, and more specifically, to a tension leg type wind and wave coupled power generation foundation. Background Technology

[0002] Floating wind power includes barge-type, semi-submersible, single-pillar, and tension leg types. Among them, the tension leg type uses tension tendons to anchor the bottom of the power generation foundation to the seabed. The downward mooring tension balances the upward excess buoyancy of the floating body, resulting in good stability. As offshore wind power develops into deep-sea areas, integrating offshore wind power with wave energy, which has development value, to increase comprehensive benefits is the key to the development of deep-sea wind farms.

[0003] Chinese patent CN202411382390.3 discloses a novel floating integrated wind, wave, and tidal energy power generation platform. It combines a wave energy conversion system and a tidal energy conversion system array installed under the pontoons with wind power generation. The wave power generation unit includes a float, a four-bar linkage mechanism, and pontoons. The four-bar linkage mechanism is used to mechanically connect the wave energy captured by the float and pontoons to convert it into hydraulic energy. Although the float can reciprocate in six directions under wave excitation and the pontoons are connected in a non-rigid manner, which can reduce the impact of wind and waves on the power generation platform, when dealing with extreme sea conditions caused by typhoons, the float and pontoons always float on the sea surface. The wave load can easily be transmitted to the power generation platform through the mechanical connection structure, even exceeding the working load limit of the mechanical connection structure, which can easily affect the safety of the entire power generation platform. Utility Model Content

[0004] In response to the above-mentioned defects or improvement needs of existing technologies, this utility model provides a tension leg type wind and wave coupled power generation foundation, which solves the problem that offshore power generation platforms that use floating structures to capture wave energy may transfer excessive loads to the power generation platform under extreme sea conditions, affecting safety.

[0005] To achieve the above objectives, according to one aspect of this utility model, a tension leg type wind-wave coupled power generation foundation is provided, comprising a column for mounting a wind turbine generator and a wind turbine tower, the column being fixed to a frame, a plurality of pontoons being fixed to the bottom of the frame, the pontoons being moored by tension legs, and an oscillating buoy, wherein a traction rope is provided on the pontoon to pull the oscillating buoy, a winch, a generator, a battery, and a motor are disposed inside the pontoon, the lower end of the traction rope is wound around the winch, the generator and the motor are respectively connected to the winch for transmission, the battery is respectively connected to the generator and the motor for electrical connection, and the oscillating buoy has two states: tightened and fixed to the pontoon and floating on the sea surface.

[0006] Its working principle is as follows: When the sea waves are small, the oscillating buoy is located at the sea level. The traction rope drives the winch to rotate, and the generator stores electrical energy in the battery. At this time, the wind turbine and the oscillating buoy generate electricity at the same time. When the sea waves are large, the battery drives the motor to rotate the winch, tightens the traction rope and winds it onto the winch, and pulls the oscillating buoy to be retrieved and fixed on the buoy.

[0007] Furthermore, the pontoon includes a first pontoon made of steel and a second pontoon made of foamed material. The first pontoon is fixed to the bottom of the second pontoon, and the tension tendon is fixed to the side wall of the first pontoon. The tension tendon is anchored to the seabed through an anchoring foundation. The first pontoon connects to the tension tendon for mooring the entire power generation foundation. The steel construction improves the strength of the tension tendon connection. The second pontoon has lower structural strength requirements and is made of foamed material to provide greater buoyancy. The multi-layered pontoon structure using different materials can provide excess buoyancy to balance the tension tendon, resulting in better resistance to wind and waves.

[0008] Furthermore, the second buoy is provided with a channel through which the traction rope passes into the first buoy. When the traction rope is subjected to the action of the oscillating float, it can move freely within the channel.

[0009] Furthermore, the first pontoon includes an empty compartment and a ballast tank fixed to the bottom of the empty compartment. The winch, the generator, the battery, and the motor are installed in the empty compartment. The ballast tank is configured to allow for buoyancy and draft adjustments during installation. The empty compartment is separated from the ballast water for installing the remaining power generation and traction structures.

[0010] Furthermore, longitudinal bulkheads are installed to divide the ballast tank into fan-shaped compartments. Pumps connected to seawater are installed in the empty compartments. The pumps are connected to each compartment of the ballast tank, dividing the ballast tank into multiple compartments whose ballast water volume can be individually adjusted. The buoyancy in different directions can be flexibly adjusted according to the attitude of the power generation foundation.

[0011] Furthermore, the column includes a first plate shell, a truss, and a second plate shell that are fixedly connected end to end from top to bottom. The wind turbine tower is vertically fixed to the first plate shell. The first plate shell and the second plate shell are box-shaped structures with plate splicing and sealing. The use of plate shell structure can reduce the amount of steel structure used, and at the same time reduce wave and flow loads.

[0012] Furthermore, the frame includes multiple diagonal braces, a first cross brace, and a second cross brace. The first pontoon and the second shell are fixedly connected by the first cross brace, each of the first pontoons is fixedly connected by the second cross brace, and the first shell is fixedly connected to each of the first cross braces by the diagonal brace.

[0013] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0014] (1) This utility model provides a tension leg wind-wave coupled power generation foundation. In extreme cases, the oscillating float can be retrieved below the water surface by pressure discharge operation in conjunction with the traction rope, so as to avoid being directly affected by waves and threatening the safety of the power generation foundation.

[0015] (2) This utility model provides a tension leg type wind-wave coupled power generation foundation. The second pontoon is made of high-strength, low-density, corrosion-resistant foam material to provide excess buoyancy.

[0016] (2) This utility model provides a tension leg type wind-wave coupling power generation foundation. The tension tendon is made of low-quality, high-strength, and corrosion-resistant fiber material to improve service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2 This is a front view of an embodiment of the present utility model;

[0019] Figure 3 This is a top view of an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the frame structure in an embodiment of the present invention (without the second pontoon installed);

[0021] Figure 5 This is a schematic diagram of the frame structure in an embodiment of the present invention (with the second pontoon and temporary pontoon already installed);

[0022] Figure 6 This is a schematic diagram of the structure of the first pontoon in an embodiment of the present invention (the top surface of the empty compartment has been hidden);

[0023] Figure 7 This is a schematic diagram of the structure of the first float and the traction rope in an embodiment of this utility model.

[0024] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Wind turbine; 2. Wind turbine tower; 3. Float; 5. Column; 6. Diagonal brace; 7. First cross brace; 8. Tension tendon; 9. Traction rope; 10. Oscillating buoy; 11. Anchoring foundation; 12. Temporary float; 16. Second cross brace; 17. Frame; 31. Second float; 32. First float; 51. First shell; 52. Truss; 53. Second shell; 311. Passageway; 321. Empty compartment; 322. Longitudinal bulkhead; 323. Ballast tank; 324. Pump; 325. Winch; 326. Generator; 327. Battery; 328. Motor. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figures 1-5 As shown, this embodiment provides a tension leg wind-wave coupled power generation foundation, including a frame 17. A column 5 for installing a wind turbine tower 2 is set along the central axis of the frame 17. The column 5 is vertically arranged and includes a first shell 51, a truss 52 and a second shell 53 fixedly connected end to end from top to bottom. The frame 17 includes multiple floats 3 evenly distributed around the circumference of the second shell 53, as well as multiple diagonal braces 6 and cross braces. The floats 3 include second floats 31 and first floats 32. In this embodiment, three first floats 32 are provided. The second shell 53 and the first floats 32 are at the same horizontal height. The cross braces include first cross braces 7 and second cross braces 16. Each first float 32 is fixedly connected to the second shell 53 through the first cross brace 7, and each first float 32 is fixedly connected to each other through the second cross brace 16. The first shell 51 is fixedly connected to each first cross brace 7 through the diagonal brace 6. The bottom of the frame 17 forms a four-column structure with three floats 3 surrounding a column 5.

[0027] Preferably, both the first shell 51 and the second shell 53 are box-shaped structures formed by splicing and sealing of sheet metal.

[0028] Furthermore, the wind turbine tower 2 is vertically fixed to the first shell 51. The upper part of the wind turbine tower 2 is used to install the wind turbine unit 1. In this embodiment, the overall displacement of the power generation foundation is about 10,000 tons, the draft of the float is about 30m, and the spacing between the floats is about 70m, which is suitable for wind turbines of 18MW and above.

[0029] Furthermore, such as Figure 1 and Figure 5 As shown, a first buoy 32 is mounted on the bottom surface of the second buoy 31. The second buoy 31 is made of high-strength, low-density, and corrosion-resistant foam material, while the first buoy 32 is made of steel. The second buoy 31 and the first buoy 32 are connected and fixed by anchor bolts. Three tension tendons 8 are fixed to the side wall of each first buoy 32. The bottom of the tension tendons 8 is anchored to the seabed through the anchoring foundation 11. The tension tendons 8 provide downward mooring tension to balance the upward excess buoyancy of the second buoy 31 and the first buoy 32.

[0030] Furthermore, such as Figure 2As indicated by the marked still water level, under normal power generation conditions, both the second buoy 31 and the first buoy 32 are located below the still water level. The first buoy 32 is connected to the oscillating float 10 on the sea surface via a tow rope 9. Specifically, as shown... Figure 6 and Figure 7 As shown, each oscillating float 10 is connected to the first float 32 by three traction ropes 9 passing through the second float 31. A channel 311 is provided on the second float 31 at the position corresponding to the three traction ropes 9, so that the traction ropes 9 can pass through and slide through it.

[0031] Furthermore, the first float 32 is a hollow structure with upper and lower layers. The upper layer is an empty compartment 321, and the lower layer is a ballast tank 323 fixed to the bottom of the empty compartment 321. The side walls of the ballast tank 323 are used to fix the tension tendon 8. Furthermore, multiple longitudinal bulkheads 322 are arranged inside the empty compartment 321 to divide the empty compartment 321 into multiple compartments. Preferably, three longitudinal bulkheads 322 are arranged radially along the empty compartment 321, dividing both the empty compartment 321 and the ballast tank 323 into three equal fan-shaped compartments. Each compartment is equipped with a generator 326, a winch 325, a battery 327, and a motor 328. The bottom end of the traction rope 9 passes through the top surface of the empty compartment 321 and is wound around the winch 325. The winch 325 is shaft-connected to the input shaft of the generator 326. During the up-and-down oscillation process, the oscillating float 10 pulls the winch 326 to rotate through the traction rope 9, thereby driving the oscillating float 10 to rotate. The generator 326 generates electricity and stores it in the battery 327. Furthermore, the motor 328 is connected to the winch 325. The oscillating float 10 has two states: tightened and fixed to the buoy 3 and located at the sea level. When the waves are small, the oscillating float 10 is located at the sea level. The winch 325 is rotated by the traction rope 9, and the generator 326 stores electrical energy in the battery 327. At this time, the wind turbine 1 and the oscillating float 10 generate electricity at the same time. When the waves are large, the battery 327 drives the motor 328 to rotate the winch 325, tightens the traction rope 9 and winds it onto the winch 325, and finally pulls the oscillating float 10 back to below the sea level, so that the oscillating float 10 is away from the water surface and fixed to the second buoy 31, reducing the direct impact of wind and waves on the oscillating float 10 and avoiding collision with the frame 17. Furthermore, a pump 324 is installed in the empty compartment 321. The pump 324 is connected to each compartment in the ballast tank 323 through multiple water pipes. When installing the wind turbine 1, the buoyancy and draft are adjusted by pumping seawater into the compartments of 324.

[0032] Furthermore, during the integrated towing process, the towing rope 9 is completely coiled in the winch, the oscillating float 10 is fixed to the surface of the first float 32, and a temporary float 12 is installed on the upper surface of the oscillating float 10 to provide additional buoyancy until the towing reaches the designated sea area, at which point the temporary float 12 is removed and the fixation between the oscillating float 10 and the first float 32 is released.

[0033] Preferably, the traction rope 9 is a steel wire rope; the tension tendon 8 is made of HMPE or aramid fiber cable, which solves the problems of high cost and easy corrosion of traditional tension tendons.

[0034] Furthermore, a method for fabricating and installing the aforementioned tension leg wind-wave coupled power generation foundation is provided, comprising the following steps:

[0035] S100, a four-column assembly structure, is formed by welding the first shell 51, truss 52 and second shell 53 to form column 5. The three first pontoons 32 are welded and fixed to the second shell 53 by the first cross brace 7. Each first pontoon 32 is fixedly connected to the other by the second cross brace 16. Finally, the two ends of the diagonal brace 6 are fixed to the first shell 51 and the first cross brace 7 to form frame 17.

[0036] S200, Install the second pontoon 31. Since the second pontoon 31 is made of a different material than the first pontoon 32, use anchor bolts to fix the second pontoon 31 to the upper part of the first pontoon 32.

[0037] S300, install the oscillating float 10, coil the traction rope 9 in the winch of the first float 32, fix the upper end of the traction rope 9 to the oscillating float 10, at this time the traction rope 9 is completely retracted into the winch, and the oscillating float 10 is fixed to the upper part of the second float 31.

[0038] S400, temporary pontoons are installed to compensate for the lack of stability of the floating foundation and to ensure that it can be towed in an integrated manner. Temporary pontoons 12 are installed on the upper surface of each oscillating buoy 10.

[0039] S500, loaded onto ship and launched, with the power generation foundation being loaded onto ship and launched using a dock or semi-submersible barge;

[0040] S600, towing and hoisting wind turbine units, towing the power generation foundation to the wind turbine assembly dock by tugboat, and then hoisting the wind turbine tower 2 and wind turbine unit 1 on column 5;

[0041] S700, an integrated towing system, uses tugboats to tow the power generation foundation of the wind turbine 1 to the installation site, where the anchor foundation 11 has been pre-installed.

[0042] S800, install tension tendon 8, adjust the buoyancy and draft of the installation foundation, connect and fix tension tendon 8 to each second float 4, and then cooperate with the tensioning device on the installation foundation to perform load shedding operation, and adjust the installation foundation to the design draft;

[0043] S900, remove the temporary buoy 12 and perform unloading operation on the oscillating float 10. At the same time, slowly release the traction rope 9. When the oscillating float 10 reaches the design position, lock the length of the traction rope 9 and empty the ballast water in the oscillating float 10. At this time, the oscillating float 10 and the wind turbine 1 can start generating electricity.

[0044] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tension leg type wind-wave coupled power generation foundation, comprising a column (5) for mounting a wind turbine generator (1) and a wind turbine tower (2), the column (5) being fixed to a frame (17), the bottom of the frame (17) being fixed with a plurality of pontoons (3), the pontoons (3) being moored by tension legs (8), characterized in that, The system includes an oscillating float (10), a traction rope (9) on the float (3) to pull the oscillating float (10), a winch (325), a generator (326), a battery (327) and a motor (328) are installed inside the float (3), the lower end of the traction rope (9) is wound around the winch (325), the generator (326) and the motor (328) are respectively connected to the winch (325) for transmission, and the battery (327) is respectively connected to the generator (326) and the motor (328) for electrical connection. The oscillating float (10) has two states: tightened and fixed to the float (3) and floating on the sea surface.

2. The tension leg type wind-wave coupled power generation foundation according to claim 1, characterized in that, The pontoon (3) includes a first pontoon (32) made of steel and a second pontoon (31) made of foam material. The first pontoon (32) is fixed to the bottom of the second pontoon (31). The tension tendon (8) is fixed to the side wall of the first pontoon (32). The tension tendon (8) is anchored to the seabed by the anchoring foundation (11).

3. The tension leg type wind-wave coupled power generation foundation according to claim 2, characterized in that, The second buoy (31) is provided with a channel (311), through which the traction rope (9) passes into the first buoy (32).

4. A tension leg type wind-wave coupled power generation foundation according to claim 2 or 3, characterized in that, The first pontoon (32) includes an empty compartment (321) and a ballast compartment (323) fixed to the bottom of the empty compartment (321). The winch (325), the generator (326), the battery (327) and the motor (328) are installed inside the empty compartment (321).

5. A tension leg type wind-wave coupled power generation foundation according to claim 4, characterized in that, The ballast tank (323) is divided into fan-shaped compartments by longitudinal bulkheads (322). A pump (324) connected to seawater is installed in the empty compartment (321), and the pump (324) is connected to each compartment of the ballast tank (323).

6. A tension leg type wind-wave coupled power generation foundation according to claim 2, characterized in that, The column (5) includes a first shell (51), a truss (52) and a second shell (53) that are fixedly connected end to end from top to bottom. The wind turbine tower (2) is vertically fixed to the first shell (51). The first shell (51) and the second shell (53) are box-shaped structures with plate splicing and sealing.

7. A tension leg type wind-wave coupled power generation foundation according to claim 6, characterized in that, The frame (17) includes multiple diagonal braces (6), a first cross brace (7) and a second cross brace (16). The first pontoon (32) and the second shell (53) are fixedly connected by the first cross brace (7). Each first pontoon (32) is fixedly connected by the second cross brace (16). The first shell (51) and each first cross brace (7) are fixedly connected by the diagonal brace (6).

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