Offshore wind power composite positioning system and floating wind turbine

Abstract

This invention discloses a wind power offshore composite positioning system and a floating wind turbine, relating to the field of offshore floating wind power technology. The aforementioned wind power offshore composite positioning system includes a support platform for fixing the tower, with vertical supports hinged to the support platform and at least partially located below the water surface. It also includes at least one buoy and several tension legs. The buoy is installed at the end of the vertical support away from the support platform, and the several tension legs are evenly distributed along the support platform. The two ends of the tension legs are respectively connected to the seabed and the support platform. The buoyancy generated by the buoy is greater than the sum of the weight of the support platform, the vertical support, and the several tension legs, so that the several tension legs apply a preload force to the support platform toward the vertical support. This can suppress the heave, pitch, and roll motion of the support system, adapt to different water depths, enhance the adaptability of the support system, and reduce the cost of the support system.

Description

Technical Field

[0001] This invention relates to the field of offshore floating wind power technology, and more specifically, to a composite positioning system for offshore wind power. Furthermore, this invention also relates to a floating wind turbine generator incorporating the aforementioned composite positioning system for offshore wind power. Background Technology

[0002] In the field of deep-sea offshore wind power development, floating foundations are a key technological approach to overcome the water depth limitations of fixed foundations. Currently, the mainstream floating foundation technologies worldwide include semi-submersible, tension leg, and column-mounted types.

[0003] Semi-submersible foundations have become the preferred type for my country's existing floating prototypes due to their wide applicability to various water depths and the domestic marine engineering industry's existing design and construction experience. However, semi-submersible foundations have complex structures, consume a large amount of steel, and have high overall construction costs. Although the unit cost has been reduced to some extent through large-scale production, it is still significantly higher than the grid parity requirements, and the potential for cost reduction has reached its limit.

[0004] Tension leg foundations connect to the seabed via vertical tension legs, using pretension to restrict the vertical movement and rotation of the floating body. This has certain advantages in deep water areas. However, in medium water depths, the pretension of the tension legs is too large, which dramatically increases the design difficulty. At the same time, traditional tension leg platforms have a large horizontal movement amplitude, resulting in excessively large rotation angles at both ends of the tension legs. This necessitates the use of specially customized universal joints, which are extremely costly. Moreover, the lack of a mature supply chain system means that equipment and installation costs far exceed expectations. Furthermore, while jacket foundations are still widely used in deep-sea areas, their unit cost increases sharply with water depth, failing to meet the economic requirements of grid parity.

[0005] In summary, how to provide a stable and low-cost offshore wind power platform is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a wind power offshore composite positioning system that can adapt to different water depths, has a more adaptable support system, and does not require counterweights, thus reducing the cost of the support system.

[0007] Another object of the present invention is to provide a floating wind turbine generator that includes the above-mentioned offshore wind power composite positioning system.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A wind power offshore composite positioning system, comprising:

[0010] Support platform, used to fix the tower;

[0011] A vertical support, which is hinged to the support platform and is at least partially submerged in water;

[0012] At least one pontoon is installed at the end of the vertical support away from the supporting platform;

[0013] A plurality of tension legs are evenly distributed along the support platform, and the two ends of the tension legs are respectively connected to the seabed and the support platform;

[0014] The buoyancy generated by the pontoon is greater than the sum of the weights of the support platform, the vertical brace, and the tension legs, so that the tension legs apply a preload force to the support platform toward the vertical brace.

[0015] Furthermore, the present invention also includes:

[0016] Several suction cylinders are embedded below the seabed mud surface to fix the suction cylinders to the seabed;

[0017] Among them, the ends of several tension legs away from the support platform are respectively fixedly connected to the corresponding suction cylinders.

[0018] Furthermore, in this invention, one of the suction cylinders is located below the vertical support, and the float is slidably mounted on the suction cylinder so that the vertical support moves only in the vertical direction.

[0019] Furthermore, in this invention, there are three or four tension legs, which are evenly distributed along the circumference of the vertical support, and the tension legs are arranged at a preset angle to the vertical support.

[0020] Furthermore, the support platform is provided with a plurality of connecting portions corresponding to the tension leg, and the connecting portions have a preset angle with the support platform so that the tension leg is perpendicular to the connecting portions.

[0021] Furthermore, the present invention also includes:

[0022] Several pre-tensioning devices are provided at the end of the tension leg near the support platform and are used to prevent the tension leg from generating a thrust on the support platform.

[0023] Furthermore, the pre-tightening device of the present invention includes:

[0024] A pre-tightened housing for connection with the connecting part;

[0025] The pretensioner is installed inside the pretensioner housing and has elastic deformation function;

[0026] The tension leg is fixedly connected to the side of the pretensioner away from the connecting part.

[0027] Furthermore, the pre-tightening housing has a stop block on the side away from the connecting part, a baffle is slidably installed inside the pre-tightening housing, the baffle is fixedly connected to the pre-tightening member, and the tension leg is fixedly connected to the baffle.

[0028] Furthermore, the pre-tightening device further includes:

[0029] A threaded rod is fixedly connected to the end of the preload housing away from the tension leg;

[0030] At least two preload nuts are threaded onto the threaded rod and located on both sides of the connection portion.

[0031] A floating wind turbine includes any of the offshore wind power composite positioning systems described above, and also includes a tower and fan blades installed on the top of the tower;

[0032] The tower is installed on the support platform and is located at the center of the support platform. The vertical brace is hinged to the support platform at a position on the axis of the tower.

[0033] The composite positioning system provided by this invention includes a support platform for fixing the tower, a vertical support hinged to the support platform and at least partially located below the water surface, and at least one buoy and several tension legs. The buoy is installed at the end of the vertical support away from the support platform, and the tension legs are evenly distributed along the support platform. The two ends of the tension legs are connected to the seabed and the support platform, respectively. The buoyancy generated by the buoy is greater than the sum of the weight of the support platform, the vertical support, and the tension legs, so that the tension legs apply a preload force towards the vertical support to the support platform. That is, because the buoyancy generated by the buoy is greater than the weight of the entire system, the system as a whole has an upward tendency to move, thereby applying an upward pulling force to the tension legs, keeping the tension legs in a taut state, thus suppressing the heave, pitch, and roll motion of the support system, resulting in a very small nose angle. Furthermore, by adjusting the buoyancy of the buoy and the length of the tension legs, it can be adapted to different water depths, making the support system more adaptable. Moreover, it does not require counterweights, greatly reducing the amount of steel used and lowering the cost of the support system.

[0034] The present invention also provides a floating wind turbine, which includes the above-mentioned offshore composite positioning system for wind power, and has the above-mentioned beneficial effects. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the overall installation and use of the present invention;

[0037] Figure 2 This is a structural schematic diagram of the preloaded component under tension provided by the present invention;

[0038] Figure 3 This is a structural schematic diagram of the pre-tightened component in the relaxed state provided by the present invention.

[0039] Figures 1-3 In the accompanying drawings, the reference numerals include:

[0040] 1. Support platform;

[0041] 2. Tower;

[0042] 3. Vertical supports;

[0043] 4. Floats;

[0044] 5. Tension leg;

[0045] 6. Suction cylinder;

[0046] 7. Pre-tightening device;

[0047] 701. Preload housing; 702. Preload component; 703. Threaded rod; 704. Preload nut; 705. Baffle; 706. Stop block;

[0048] 8. Connecting parts; Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The core of this invention is to provide a wind power offshore composite positioning system that can adapt to different water depths, has a more adaptable support system, and does not require counterweights, thus reducing the cost of the support system.

[0051] Another object of the present invention is to provide a floating wind turbine generator that includes the above-mentioned offshore wind power composite positioning system.

[0052] Please refer to Figure 1A wind power offshore composite positioning system includes a support platform 1 for fixing a tower 2, a vertical support 3 hinged to the support platform 1 and at least partially located below the water surface, and at least one buoy 4 and several tension legs 5. The buoy 4 is installed at the end of the vertical support 3 away from the support platform 1, and the several tension legs 5 are evenly distributed along the support platform 1. The two ends of the tension legs 5 are respectively connected to the seabed and the support platform 1. The buoyancy generated by the buoy 4 is greater than the sum of the weights of the support platform 1, the vertical support 3 and the several tension legs 5, so that the several tension legs 5 apply a preload force to the support platform 1 toward the vertical support 3.

[0053] In one specific embodiment, the support platform 1 is a steel frame or truss structure used to fix and install the tower 2 of the wind turbine generator set, and the support platform 1 is usually triangular, quadrilateral or circular, with sufficient rigidity and load-bearing capacity.

[0054] In one specific embodiment, the pontoon 4 is a sealed hollow structure, which can be filled with air or low-density material to generate huge buoyancy. The volume of the pontoon 4 is determined according to the required buoyancy calculation to ensure that the buoyancy it generates is greater than the sum of the weight of the support platform 1, the vertical support 3 and all the tension legs 5, i.e., the entire support system.

[0055] In one specific embodiment, the number of tension legs 5 can be determined according to the usage environment, using at least 3 or 4 sets to ensure the balance effect on the support platform 1.

[0056] In one specific embodiment, the tension leg 5 can be made of high-strength steel wire rope or steel chain, or a steel pipe structure, to prevent the tension leg 5 from being compressed or loosened.

[0057] In a specific implementation of this invention, the composite positioning system includes a support platform 1 for fixing the tower 2, a vertical support 3 hinged to the support platform 1 and at least partially located below the water surface, and at least one buoy 4 and several tension legs 5. The buoy 4 is installed at the end of the vertical support 3 away from the support platform 1, and the several tension legs 5 are evenly distributed along the support platform 1. The two ends of the tension legs 5 are respectively connected to the seabed and the support platform 1. The buoyancy generated by the buoy 4 is greater than the sum of the weights of the support platform 1, the vertical support 3, and the several tension legs 5, so that the several tension legs 5... A preload force is applied to the support platform 1 toward the vertical support 3. That is, because the buoyancy generated by the float 4 is greater than the weight of the entire system, the system as a whole tends to move upward. This, in turn, applies an upward pulling force to the tension leg 5, keeping the tension leg 5 in a taut state. This suppresses the heave, pitching, and rolling motion of the support system, resulting in a very small nose angle. Furthermore, by adjusting the buoyancy of the float 4 and the length of the tension leg 5, it can be adapted to different water depths, making the support system more adaptable. Moreover, it does not require counterweights, greatly reducing the amount of steel used and lowering the cost of the support system.

[0058] In other words, the first step is to assemble the support platform 1, vertical support 3, and pontoon 4. The top of the vertical support 3 is hinged to the support platform 1. The assembled structure is towed to the installation area. The buoyancy of the pontoon 4 is used to keep it floating. One end of the tension leg 5 is connected to the support platform 1, and the other end is lowered to the seabed and connected to the anchoring foundation. By adjusting the ballast water volume in the pontoon 4, the difference between buoyancy and gravity is precisely controlled, thereby setting the preload of the tension leg 5. At this time, the support platform 1 remains stable, and the tower 2 and wind turbine can be installed. The system maintains stable stability under the buoyancy preload. The final adjustment of the buoyancy of the pontoon 4 can also be carried out after the tower 2 and wind turbine are installed.

[0059] Please refer to Figure 1 In some embodiments, the system also includes several suction cylinders 6, all embedded below the seabed mud surface, so that the suction cylinders 6 are fixed to the seabed. The ends of several tension legs 5 away from the support platform 1 are respectively fixedly connected to the corresponding suction cylinders 6. That is, the suction cylinders 6 penetrate below the seabed mud surface through negative pressure sinking technology. After the seawater inside the cylinder is pumped out, the pressure difference inside and outside the cylinder presses the suction cylinder 6 into the seabed to the design depth, forming a stable anchoring foundation. The ends (lower ends) of the tension legs 5 away from the support platform 1 are fixedly connected to the connecting seat at the top of the suction cylinder 6 through connecting lugs, pins or universal joints. The suction cylinders 6 provide greater pull-out resistance and horizontal bearing capacity to meet the pre-tightening requirements of the tension legs 5.

[0060] That is, each suction cylinder 6 corresponds to at least one tension leg 5. The suction cylinder 6 is transported to the installation point and initially sinks using its own weight. The vacuum pump is started to extract the seawater inside the cylinder. Under negative pressure, the suction cylinder 6 penetrates into the seabed. After reaching the design depth, pumping is stopped, the valve is closed to maintain negative pressure, and the lower end of the tension leg 5 is connected to the connecting seat at the top of the suction cylinder 6. No piling is required, and the installation of a single cylinder can be completed within a few hours, which greatly shortens the time for offshore operations. Moreover, compared with the jacket foundation, the suction cylinder 6 uses less steel, further reducing the cost.

[0061] In one specific embodiment, a single-tube, multi-tube parallel, or skirted base can be used to increase suction power.

[0062] Please refer to Figure 1In some embodiments, one of the suction cylinders 6 is located below the vertical support 3, and the float 4 is slidably installed on the suction cylinder 6 so that the vertical support 3 can only move in a preset direction. That is, the suction cylinder 6 is the central suction cylinder 6, directly below the vertical support 3 (i.e., arranged coaxially with the vertical support 3). The float 4 is not rigidly fixed to the vertical support 3, but is slidably sleeved on the outer or inner wall of the central suction cylinder 6. Specifically, a vertical guide rail can be set on the outer wall of the central suction cylinder 6, and a slider that cooperates with the guide rail can be set on the float 4. Alternatively, the float 4 can be sleeved on the outside of the suction cylinder 6, and a sliding bearing can be set between the two. The sliding installation allows the float 4 (together with the vertical support 3) to move freely along the axial direction (vertical direction) of the central suction cylinder 6, but it cannot move horizontally. That is, the vertical support 3 can only move in a preset direction (vertical direction), and the horizontal displacement is constrained by the central suction cylinder 6.

[0063] In other words, after the central suction cylinder 6 is embedded in the seabed, it becomes a fixed vertical guide column. The buoy 4 and the vertical support 3 can slide up and down along it, but cannot sway left and right, giving the entire system extremely high rigidity in the horizontal direction, resisting the horizontal thrust of ocean currents and waves. At the same time, it retains the vertical degree of freedom, so that the preload of the tension leg 5 is not constrained, eliminating the need for an additional horizontal mooring system, further reducing costs. Meanwhile, it does not affect the buoyancy adjustment of the buoy 4 and the preload function of the tension leg 5, ensuring that the support platform 1 has extremely high stability.

[0064] In one specific embodiment, buffer blocks 706 may be provided at the top and bottom of the suction cylinder 6 to limit the maximum upward and downward stroke of the float 4.

[0065] Please refer to Figure 1 In some embodiments, there are three or four tension legs 5, which are evenly distributed along the circumference of the vertical support 3. The tension legs 5 are arranged at a preset angle to the vertical support 3, that is, they are evenly distributed along the circumference of the vertical support 3 (i.e., they are at an angle of 120° to each other). The three-point or four-point distribution is the most stable geometric layout, which can resist horizontal forces in any direction and avoid over-constraint. The axis of the tension leg 5 is at a preset angle θ with the axis (vertical) of the vertical support 3, which is usually 0°~45°. The optimal tension leg 5 angle θ is determined by simulation calculation based on environmental parameters such as water depth, wave height, and current velocity of the target sea area.

[0066] In one specific embodiment, a ball joint is used between the vertical support 3 and the support platform 1, which enables the vertical support 3 and the support platform 1 to rotate in all directions.

[0067] Please continue to refer to this. Figure 1 In some embodiments, the support platform 1 is provided with a plurality of connecting parts 8 corresponding to the tension leg 5. The connecting parts 8 have a preset angle with the support platform 1 so that the tension leg 5 is perpendicular to the connecting parts 8 when it is installed.

[0068] Therefore, the support platform 1 is provided with several connecting parts 8 (ear plates or pin seats) corresponding to the tension leg 5. The connecting parts 8 and the mounting surface of the support platform 1 have a preset angle. This angle makes the tension leg 5 perpendicular to the connecting part 8 when it is installed (that is, the axis of the tension leg 5 is perpendicular to the surface of the connecting part 8), so that the connecting parts (such as universal joints) at the end of the tension leg 5 are subjected to optimal force and avoid additional bending moment.

[0069] In one specific embodiment, the connecting part 8 is a plate-like structure that can be rotatably or welded to the edge of the support platform 1.

[0070] In the above embodiment, the connecting part 8 is mounted on the support platform 1 in a rotating direction. Therefore, the rotation angle of the connecting part 8 can be changed according to the actual needs of use, thereby accommodating tension legs 5 with more installation angles.

[0071] In the above embodiment, a support column is installed on the support platform 1, and a connecting seat is rotatably installed on both the support column and the connecting part 8. A screw is provided between the two connecting seats. The screw is rotatably connected to one of the connecting seats and threadedly engaged with the other connecting seat. Therefore, the angle of the connecting part 8 can be controlled by rotating the screw, so as to quickly adjust the angle of the connecting part 8 according to different usage requirements.

[0072] Please refer to Figure 1 In some embodiments, the support system further includes several pre-tensioning devices 7 located at the end of the tension leg 5 near the support platform 1, and used to prevent the tension leg 5 from generating a thrust on the support platform 1. That is, the pre-tensioning devices 7 ensure that the tension leg 5 does not become loose or compressed under any working condition, avoid buckling of the pressure rod, and ensure effective support for the support platform 1.

[0073] In one specific embodiment, please refer to Figure 2The pretensioning device 7 includes a pretensioning housing 701 and a pretensioning member 702 for connection with the connecting part 8. The pretensioning member 702 is installed inside the pretensioning housing 701 and has elastic deformation function. The tension leg 5 is fixedly connected to the side of the pretensioning member 702 away from the connecting part 8. A stop 706 is provided on the side of the pretensioning housing 701 away from the connecting part 8. A baffle 705 is slidably installed inside the pretensioning housing 701 and is fixedly connected to the pretensioning member 702. The tension leg 5 is fixedly connected to the baffle 705. That is, the pretensioning housing 701 is a cylindrical or box-shaped structure, and its upper end is fixedly connected to the connecting part 8. The pretensioning member 702 is installed inside the pretensioning housing 701 and has elastic deformation function. It is preferably a high-strength helical compression spring or a disc spring assembly. The pretensioning member 702 is in a relaxed state in the initial state, that is, the tension leg 5 has a certain displacement space at this time. There is a baffle 705, which is fixedly connected to the lower end of the pretensioner 702. The upper end of the tension leg 5 is fixedly connected to the baffle 705. Therefore, under normal working conditions, the buoyancy of the float 4 is greater than the weight of the system, the tension leg 5 bears the tension force, the pretensioner 702 (spring) is in a compressed state, the baffle 705 and the stop block 706 do not contact each other, and the load is transmitted through the spring. When extreme waves cause the float 4 to sink and the tension of the tension leg 5 to decrease, the spring extends and pushes the baffle 705 to move down, keeping the tension leg 5 always under tension and preventing slack. If the tension force on the tension leg 5 is greater than the maximum elastic force of the spring, the baffle 705 is pulled to contact the stop block 706, and the load is directly transmitted by the pretensioner housing 701 (rigid transmission), avoiding damage from excessive spring stretching, ensuring that the tension leg 5 does not slack or become compressed under any working condition, avoiding buckling of the pressure rod, and the spring automatically compensates for tension fluctuations to maintain a constant pretension force.

[0074] Please refer to Figure 3 In some embodiments, the pretensioning device 7 further includes a threaded rod 703 and at least two pretensioning nuts 704, which are fixedly connected to the end of the pretensioning housing 701 away from the tension leg 5. The two pretensioning nuts 704 are threaded onto the threaded rod 703 and are located on both sides of the connecting part 8, that is, the threaded rod 703 is fixedly connected to the end (upper end) of the pretensioning housing 701 away from the tension leg 5. The threaded rod 703 passes through the connecting part 8 of the support platform 1. The two pretensioning nuts 704 are threaded onto the threaded rod 703 and are located on both sides of the connecting part 8, which are used to adjust the initial position and pretensioning force of the pretensioning device 7. Therefore, by rotating the pretensioning nuts 704, the extension length of the threaded rod 703 can be adjusted, thereby changing the initial compression of the pretensioning member 702, accurately setting the minimum pretensioning force of the tension leg 5, and thus adapting to different sea conditions.

[0075] In one specific embodiment, a force sensor and a displacement sensor can be integrated into the pretensioning device 7 to monitor the force state of the tension leg 5 in real time, and the monitored state can be transmitted through a remote transmission device to facilitate remote monitoring of the state of the tension leg 5.

[0076] In one specific embodiment, the rotation of the preload nut 704 can be controlled by a motor, thereby achieving remote control of the tensioning progress of the preload device 7. Specifically, the motor is fixed to the connecting part 8, the preload nut 704 is rotatably mounted on the connecting part 8 through a bearing, and a gear is sleeved on the outside of the preload nut 704. The output end of the motor is provided with a reducer, and the output end of the reducer is provided with a drive wheel that meshes with the gear, thereby achieving control of the rotation of the preload nut 704.

[0077] A floating wind turbine includes a wind power offshore composite positioning system, a tower 2, and fan blades 9 mounted on top of the tower 2. The tower 2 is mounted on a support platform 1 and located at the center of the support platform 1. The hinge point between the vertical support and the support platform 1 is located on the axis of the tower 2, and the hinge point between the vertical support 3 and the support platform 1 is located on the axis of the tower 2 (i.e., the center of the support platform 1). This ensures that the overturning moment transmitted by the tower 2 acts directly on the support platform 1 through the hinge point, without generating an additional bending moment on the vertical support 3, so that the vertical support 3 only bears axial force. The thrust generated causes the tower 2 to have an overturning moment, which is transmitted to the tension leg 5 through the support platform 1. Since the vertical support 3 is hinged to the support platform 1 and the hinge point is located on the axis of the tower 2, the overturning moment is not transmitted to the vertical support 3, but is entirely borne by the tension leg 5. In addition, the buoyancy generated by the float 4 is greater than the total weight of the system, so that the tension leg 5 is always taut, providing restoring stiffness and suppressing the platform sway. Therefore, the central suction cylinder 6 constrains the horizontal displacement, and the outer suction cylinder 6 provides pull-out anchoring, which together maintains the stability of the wind turbine position and greatly improves the stability of the offshore wind power platform.

[0078] In one specific embodiment, the support platform 1, the vertical support 3, the float 4, and the tension leg 5 are all metal components with an anti-corrosion coating on their surfaces.

[0079] Therefore, by using the articulated vertical brace 3 and buoyancy pre-tensioning structure, the core problems of high cost and easy loosening of tension leg 5 in traditional floating foundations under medium water depth conditions are completely solved. Furthermore, by using a composite positioning scheme of sliding guide of central suction cylinder 6 and anchoring of peripheral suction cylinder 6, the functional division of horizontal constraint and vertical anchoring is realized, which greatly improves positioning accuracy and stability. The tension adaptive mechanism of spring pre-tensioning device 7 and double nut adjustment ensures that tension leg 5 is always under tension under all working conditions, avoiding instability and fatigue damage of tension leg 5, greatly reducing the cost of offshore wind power platforms, and making them suitable for more water areas.

[0080] In other words, the key point of the invention is that several tension legs 5 are evenly distributed along the support platform 1, with both ends of the tension legs 5 connected to the seabed and the support platform 1 respectively. The buoyancy generated by the float 4 is greater than the sum of the weights of the support platform 1, the vertical support 3, and the tension legs 5, so that the tension legs 5 apply a preload force to the support platform 1 towards the vertical support 3. That is, because the buoyancy generated by the float 4 is greater than the weight of the entire system, the system as a whole has an upward tendency, which in turn applies an upward pulling force to the tension legs 5, keeping the tension legs 5 in a taut state. This suppresses the heave, pitch, and roll motion of the support system, resulting in a very small nose angle. Furthermore, by adjusting the buoyancy of the float 4 and the length of the tension legs 5, it can be adapted to different water depths, making the support system more adaptable. Moreover, it does not require counterweights, greatly reducing the amount of steel used and lowering the cost of the support system.

[0081] In other words, the first step is to assemble the support platform 1, vertical support 3, and pontoon 4. The top of the vertical support 3 is hinged to the support platform 1. The assembled structure is towed to the installation area. The buoyancy of the pontoon 4 is used to keep it floating. One end of the tension leg 5 is connected to the support platform 1, and the other end is lowered to the seabed and connected to the anchoring foundation. By adjusting the ballast water volume in the pontoon 4, the difference between buoyancy and gravity is precisely controlled, thereby setting the preload of the tension leg 5. At this time, the support platform 1 remains stable, and the tower 2 and wind turbine can be installed. The system maintains stable stability under the buoyancy preload. The final adjustment of the buoyancy of the pontoon 4 can also be carried out after the tower 2 and wind turbine are installed.

[0082] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0083] The present invention provides a detailed description of a wind power offshore composite positioning system and a floating wind turbine generator. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely illustrative of the method and core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A composite positioning system for offshore wind power, characterized in that, include: Support platform (1) is used to fix the tower (2); A vertical support (3) is hinged to the support platform (1) and is at least partially below the water surface; At least one pontoon (4) is installed at the end of the vertical support (3) away from the support platform (1); Several tension legs (5) are evenly distributed along the support platform (1), and the two ends of the tension legs (5) are connected to the seabed and the support platform (1) respectively. The buoyancy generated by the float (4) is greater than the sum of the weights of the support platform (1), the vertical brace (3) and the tension legs (5), so that the tension legs (5) apply a preload force toward the vertical brace (3) to the support platform (1).

2. The offshore composite positioning system for wind power according to claim 1, characterized in that, Also includes: Several suction cylinders (6) are embedded below the seabed mud surface to fix the suction cylinders (6) to the seabed; Among them, the ends of several tension legs (5) away from the support platform (1) are respectively fixedly connected to the corresponding suction cylinders (6).

3. The offshore composite positioning system for wind power according to claim 2, characterized in that, One of the suction cylinders (6) is located below the vertical support (3), and the float (4) is slidably mounted on the suction cylinder (6) so that the vertical support (3) moves only in the vertical direction.

4. The offshore composite positioning system for wind power according to claim 3, characterized in that, There are three or four tension legs (5), which are evenly distributed along the circumference of the vertical support (3). The tension legs (5) and the vertical support (3) are arranged at a preset angle.

5. The offshore composite positioning system for wind power according to any one of claims 1-4, characterized in that, The support platform (1) is provided with a plurality of connecting parts (8) corresponding to the tension leg (5). The connecting parts (8) and the support platform (1) have a preset angle so that the tension leg (5) is perpendicular to the connecting parts (8).

6. The offshore composite positioning system for wind power according to claim 5, characterized in that, Also includes: Several pre-tensioning devices (7) are provided at the end of the tension leg (5) near the support platform (1) and are used to prevent the tension leg (5) from generating a thrust on the support platform (1).

7. The offshore composite positioning system for wind power according to claim 6, characterized in that, The pre-tightening device (7) includes: A pre-tightened housing (701) is used to connect to the connecting part (8); The pretensioner (702) is installed inside the pretensioner housing (701) and has elastic deformation function; The tension leg (5) is fixedly connected to the pretensioner (702) on the side away from the connecting part (8).

8. The offshore composite positioning system for wind power according to claim 7, characterized in that, The pre-tightening housing (701) has a stop (706) on the side away from the connecting part (8), and a baffle (705) is slidably installed inside the pre-tightening housing (701). The baffle (705) is fixedly connected to the pre-tightening member (702), and the tension leg (5) is fixedly connected to the baffle (705).

9. The offshore composite positioning system for wind power according to claim 8, characterized in that, The pre-tightening device (7) also includes: The threaded rod (703) is fixedly connected to the end of the pre-tightening housing (701) away from the tension leg (5); At least two preload nuts (704) are threaded onto the threaded rod (703) and located on both sides of the connection (8).

10. A floating wind turbine generator, characterized in that, The offshore composite positioning system for wind power as described in any one of claims 1-9 further includes a tower (2) and fan blades (9) installed on the top of the tower (2). The tower (2) is installed on the support platform (1) and is located at the center of the support platform (1). The vertical support (3) is hinged to the support platform (1) on the axis of the tower (2).

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