A self-balancing wind power floating platform with tension-compression

Abstract

The present application relates to a self-balanced wind power floating platform in tension, comprising a central tower for supporting wind power equipment, a rigid frame for fixing the central tower, a plurality of floating barrels connected to the rigid frame, a lower balancing column connected to the rigid frame, and a cable system, wherein: the central tower is inclined and arranged on the rigid frame, the plurality of floating barrels provide buoyancy for the rigid frame, the cable system includes upper side cables pulled between the central tower and the rigid frame and lower side cables pulled between the lower balancing column and the rigid frame, the upper side cables are distributed in groups along the circumferential direction of the central tower, the lower side cables are distributed in groups along the circumferential direction of the lower balancing column, and the upper side cables and the lower side cables of the rigid frame correspond to each other and are in force balance. The effect is that: by arranging the cables vertically and oppositely, the internal force of the floating foundation is greatly reduced, and by arranging the cables in groups oppositely in the circumferential direction, the bending moment of the central tower is reduced, thereby reducing the steel consumption of the floating foundation and the central tower and lowering the cost per unit of electricity generated.

Description

Technical Field

[0001] This application relates to wind power generation technology, and particularly to an opposed self-balanced floating wind power platform. Background Art

[0002] Offshore wind power generation is a technology that utilizes ocean wind energy for power generation. It has the advantages of being renewable, low-carbon, and efficient, and is an energy utilization method vigorously promoted globally. However, the environment in the deep sea area is relatively complex. To cope with extreme environments and ensure safety and stability, the construction cost and difficulty of fixed wind turbines increase sharply with the increase in water depth. Floating wind turbines are more economical and adaptable in the deep sea and will become the main technology for developing the deep sea.

[0003] Currently, floating wind turbines in the deep sea are developing towards larger unit capacities. Relatively speaking, the tower is a key component for matching large-capacity units, and its design is also facing the development of large-scale, which increases the construction cost of the tower and greatly reduces the economy of floating wind power. Therefore, there is an urgent need for a new type of tower to control the construction cost of the tower and thus reduce the cost of the offshore wind turbine per unit of electricity generated (levelized cost of electricity).

[0004] Existing offshore floating wind turbine towers, for example, a floating dual-head offshore wind turbine tower disclosed in Chinese Patent Publication No. CN221074502U and a beam-type offshore floating wind turbine power generation system disclosed in Chinese Patent Publication No. CN113915070. Cable stays are arranged on the tower to share part of the external force, thereby reducing the amount of structural materials used in the tower and increasing stability. However, there are still some disadvantages: First, the arrangement method of the cable stays on the tower is not opposing. There are cable stays on one side of the tower column body, and no cable stays on the other side. The tower column can only bear the load in one direction and is prone to collapse when subjected to reverse loads. In addition, this arrangement method will cause large internal forces in the tower column, so the size and weight of the tower column cannot be effectively reduced. Second, the arrangement method of the upper and lower cable stays of the floating foundation is also not opposing, that is, no cable stays are arranged under the floating foundation. Then, under the action of the cable stays on the upper part of the platform, there will be large internal forces in the floating foundation. Using a giant frame structure to resist this internal force is not a very economical approach. Third, the cable stay surface arrangement is less, and the structural stiffness in the direction lacking the cable stay surface is weak. Excessive deformation at the top of the tower is not conducive to the efficient power generation of the wind turbine. Summary of the Invention

[0005] In view of this, the present application provides an opposed-pull self-balancing wind power floating platform. The cables are arranged in an upper and lower opposed circumferential manner. Whether it is the tower column or the cross braces of the floating foundation, there are several groups of opposed cables arranged circumferentially. That is, there are opposed-pull self-balancing cables in front and behind, left and right of the tower, and above and below the floating foundation. When external loads act, the opposed cables on the periphery coordinate with each other to bear most of the external forces. This will make the absolute value of the bending moment of the tower column or cross brace very small, even zero, effectively reducing the size and weight of the tower column or cross brace, and reducing the construction cost. In addition, the central tower barrel of this solution is arranged obliquely, avoiding the problem of interference between the cables and the fan blades, which is beneficial to the arrangement of the cables and also beneficial to the efficient utilization of the wind power tower barrel.

[0006] In order to achieve the above object, the technical solution of the present application is as follows:

[0007] An opposed-pull self-balancing wind power floating platform, which is characterized in that it includes a central tower column for supporting wind power equipment, a rigid frame for fixing the central tower column, a plurality of floating barrels connected to the rigid frame, a lower balance column connected to the rigid frame, and a cable system, wherein:

[0008] The central tower column is obliquely arranged on the rigid frame. The plurality of floating barrels provide buoyancy for the rigid frame. The cable system includes upper-side cables pulled between the central tower column and the rigid frame and lower-side cables pulled between the lower balance column and the rigid frame. The upper-side cables are distributed in groups along the circumference of the central tower column, corresponding to each other and in force balance; the lower-side cables are distributed in groups along the circumference of the lower balance column, corresponding to each other and in force balance; the upper-side cables and the lower-side cables of the rigid frame correspond to each other and are in force balance. Optionally, the central tower column is a truss structure or a tubular structure, and a plurality of cable nodes are arranged along the length direction.

[0009] Optionally, the rigid frame includes a plurality of circumferentially horizontally distributed cross brace structures and tie rod structures connected between adjacent two cross brace structures. The intersection points of the plurality of cross brace structures serve as the rigid connection points of the central tower column and the lower balance column, and a plurality of cable nodes are arranged on the cross brace structures. Optionally, the cross brace is a truss structure or a tubular structure.

[0010] Optionally, the lower balance column is a truss structure or a tubular structure, and a plurality of cable nodes are arranged along the length direction. A counterweight is further arranged at the bottom end of the lower balance column.

[0011] Optionally, a plurality of cross brace structures are provided, and floating barrels are arranged at the distal ends of each cross brace structure. Some cross brace structures are arranged away from the central tower column and the center of gravity of the floating platform is adjusted by increasing their length or adding counterweights.

[0012] Optionally, the central tower column is in an A shape, the lower balance column is in a V shape, and two rigid connection points for connecting the central tower column and the lower balance column are arranged on the rigid frame.

[0013] Optionally, the upper stay cables and / or the lower stay cables are arranged in layers at different heights.

[0014] Optionally, shock damping devices are arranged at both ends of each stay cable.

[0015] Optionally, each stay cable in the upper stay cables and / or the lower stay cables adopts a single-cable form or a multi-cable composite form.

[0016] Optionally, a single point mooring system is further configured on the rigid frame, and the single point mooring system includes a mooring cable and a mooring foundation.

[0017] The present application provides an opposed-pull self-balancing wind power floating platform, which has the following remarkable effects:

[0018] (1) Since the floating foundation of the deep and far sea floating wind turbine has a huge shape and relatively high construction cost, the internal force of the floating foundation is greatly reduced by the upper and lower opposed stay cables, so that the sizes of the various components of the floating foundation can be reduced, the steel consumption can be reduced, and the cost per kilowatt-hour can be reduced.

[0019] (2) The circumferentially opposed stay cables arranged on the central tower column greatly reduce the absolute value of the bending moment of the central tower column or even make it zero through cable adjustment measures, which is beneficial to greatly reducing the steel consumption of the central tower column and effectively reducing the construction cost of the tower.

[0020] (3) The lightweight tower column and floating foundation are beneficial to transportation and installation, do not require super-large hoisting equipment, and the construction is more convenient. Description of the Drawings

[0021] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present application, and are used together with the specification to explain the principles of the present application, and do not constitute an improper limitation to the present application.

[0022] Figure 1 It is a schematic structural diagram of the opposed-pull self-balancing wind power floating platform in Embodiment 1;

[0023] Figure 2 It is a schematic structural diagram of the opposed-pull self-balancing wind power floating platform in Embodiment 2;

[0024] Figure 3 It is a schematic structural diagram of the opposed-pull self-balancing wind power floating platform in Embodiment 3.

[0025] Description of the Drawings: 1 - Wind power equipment, 2 - Central tower column, 3 - Rigid frame, 4 - Buoy, 5 - Lower balance column, 6 - Cable system, 7 - Single point mooring system, 31 - Cross brace structure, 32 - Tie rod structure, 51 - Counterweight, 61 - Upper side cable, 62 - Lower side cable, 71 - Mooring cable, 72 - Mooring foundation, 8 - Single point mooring rotating device Detailed implementation manners

[0026] In order to enable those of ordinary skill in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0028] Embodiment 1:

[0029] As Figure 1 shown, a self-balancing wind power floating platform with tensioning includes a central tower column 2 for supporting wind power equipment 1, a rigid frame 3 for fixing the central tower column 2, a plurality of buoys 4 connected to the rigid frame 3, a lower balance column 5 connected to the rigid frame 3, and a cable system 6 and a single point mooring system 7, wherein:

[0030] The wind power equipment 1 is usually a wind turbine unit. The central tower column 2 is inclined on the rigid frame 3, thereby effectively avoiding the influence of the wind turbine blades, so that the wind turbine blades can be vertically arranged. Compared with the installation method of adjusting the blade pitch angle and cone angle in the prior art, the power generation efficiency of the wind turbine unit can be better maintained. Specifically, the central tower column 2 can adopt a truss structure or a tubular structure. In this example, a single tubular column structure is adopted, and a plurality of cable nodes are arranged along the length direction.

[0031] From Figure 1It can be seen that the rigid frame 3 includes a plurality of horizontally distributed circumferential cross bracing structures 31 and a tie rod structure 32 connected between two adjacent cross bracing structures 31. The intersection of the plurality of cross bracing structures 31 serves as a rigid connection point between the central tower column 2 and the lower balance column 5. A plurality of cable nodes are arranged on the cross bracing structure 31. In this example, a four-buoy structure is adopted, and four cross bracing structures are arranged and distributed in a cross shape. Considering that the center of gravity position changes after the central tower column 2 is tilted, one of the cross bracing structures is arranged away from the central tower column 2 and the center of gravity of the floating platform is adjusted by increasing its counterweight. The buoy 4 is arranged at the far end of each cross bracing structure 31, and buoyancy is provided to the rigid frame 3 through the four buoys. In specific implementation, according to the distribution of the center of gravity of the platform, four buoys of different sizes can be selected to provide different buoyancy to maintain the overall balance of the platform. The cross bracing structure 31 can adopt a truss structure or a tubular structure. In this example, a single tubular column structure is adopted.

[0032] pass Figure 1 It can also be seen that the lower balance column 5 can also adopt a truss structure or a tubular structure. In this example, a single tubular column structure is also adopted, and a plurality of cable nodes are arranged along the length direction. A counterweight block 51 is also arranged at the bottom end of the lower balance column 5 to lower the center of gravity of the entire floating platform.

[0033] In specific implementation, the cable system 6 includes an upper cable 61 pulled between the central tower column 2 and the rigid frame 3, and a lower cable 62 pulled between the lower balance column 5 and the rigid frame 3. The upper cables 61 are distributed in groups along the circumference of the central tower column 2, and the lower cables 62 are distributed in groups along the circumference of the lower balance column 5. Each group of upper cables 61 and each group of lower cables 62 correspond to each other and are balanced in force. For the four-buoy structure provided in this example, the upper cables 61 and the lower cables 62 are arranged in groups of two, the left and right opposing cables are one group, and the front and back opposing cables are one group.

[0034] As the main force-bearing component, the cable provides the rigidity of the overall structure, so it is necessary to pre-tension the cable. Considering the different forces on the cables, a single cable with large tonnage or a combination of multiple cables with small tonnage can be used for a larger force, and a single cable with small tonnage can be used for a smaller force. Therefore, according to the force requirements, each of the upper and lower cables can be selectively used in a single cable form or a multi-cable composite form. Through the tensioning adjustment of the cables, the circumferential opposite cables balance each other, so that the central tower column is only subjected to a small bending moment, or even 0. In addition, through the tensioning adjustment of the cables, the upper and lower cables of the rigid frame correspond to each other and are balanced in force, so that the floating foundation is only subjected to a small bending moment, or even 0. In the specific implementation, considering the vibration problem of the cables, shock absorbers are set at both ends of each cable.

[0035] In specific implementation, according to the length and rigidity requirements of the central tower column and the lower balance column, the upper side cables and / or the lower side cables are arranged in layers at different heights. Figure 1 It can be seen that in this example, the upper cables are divided into three layers, including high cables and low cables. The tower column connection point of the high cables is set at the top of the central tower column 2, and the tower column connection point of the low cables is set in the middle of the central tower column 2. Correspondingly, two layers of cable connection points are also set on the lower balance column 5. The layered setting further ensures the reasonable force of the tower column segment.

[0036] Taking into account the change in wind direction, the single-point mooring system 7 includes a mooring rope 71 and an anchoring foundation 72. In this example, the anchoring point is set on a buoy away from the central tower 2. The single-point mooring system can automatically face the wind.

[0037] Embodiment 2:

[0038] like Figure 2 As shown, the difference between this embodiment and embodiment 1 is mainly that the structure of the rigid frame 3 and the anchoring system 7 are changed. Figure 2 It can be seen that in this example, a three-buoy structure is adopted. The three cross bracing structures 31 in the rigid frame 3 converge at one point at the proximal end and serve as a rigid connection point to connect the central tower column 2 and the lower balance column 5. A buoy 4 is respectively arranged at the distal end of the three cross bracing structures 31, one of which is away from the tilt direction of the central tower column 2 and is equipped with a larger weight to change the center of gravity. Multiple cable connection points are arranged on the central tower column 2 and the lower balance column 5. Through the pre-adjustment optimization, the absolute value of the bending moment of the central tower column 2 is very small or even 0. The mooring system is not directly connected to the buoy on the structure, but is softly connected to the single-point single-point mooring rotating device 8 on the mooring system through the buoy on the structure with the mooring cable. The mooring system reduces the internal force of the mooring cable when the structure yaws by means of mooring soft connection. According to the three-buoy rigid frame structure provided in this example, the upper side cables and the lower side cables in this example use three cables as a group, and the high-position cables and the low-position cables are arranged in groups opposite to each other to maintain force balance.

[0039] According to the requirements of different application scenarios, different forms of rigid frames 3 can be used to maintain the balance and stability of the central tower column.

[0040] Embodiment 3:

[0041] like Figure 3 As shown, the main difference between this embodiment and embodiment 1 is that the structures of the central tower column 2 and the lower balance column 5 are changed. Figure 3It can be seen that in this example, the central tower column is in an A shape, and the lower balance column is in a V shape. There are two rigid connection points for connecting the central tower column and the lower balance column on the rigid frame. This way makes the size of a single tower body smaller, and adjacent columns are connected by cross bars. Multiple cable nodes can be arranged along the length direction on the cross bracing structure 31, and cables connected to the cross bracing structure 31 and the rigid nodes are added to ensure the reasonable force of the cross bracing section.

[0042] In summary, it can be seen that the counter-tension self-balanced wind power floating platform provided by the present invention can greatly reduce the steel consumption of the central tower column on the premise of ensuring stability, effectively reduce the tower construction cost, and at the same time greatly reduce the internal force of the floating foundation by setting cables, and can further reduce the sizes of various components of the floating foundation. Finally, it makes the construction of the lightweight tower column and the floating foundation more convenient.

[0043] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A self-balancing wind power floating platform, characterized in that: The invention comprises a central tower column for supporting a wind power device, a rigid frame for fixing the central tower column, a plurality of buoys connected to the rigid frame, a lower balance column connected to the rigid frame, and a cable system, wherein: The central tower is tiltedly arranged on the rigid frame, and a plurality of buoys provide buoyancy for the rigid frame. The cable system includes an upper cable pulled between the central tower and the rigid frame and a lower cable pulled between the lower balance column and the rigid frame. The upper cables are distributed in groups along the circumference of the central tower, corresponding to each other and balanced in force; the lower cables are distributed in groups along the circumference of the lower balance column, corresponding to each other and balanced in force; the upper cables and the lower cables of the rigid frame correspond to each other and balanced in force; The rigid frame includes a plurality of circumferentially horizontally distributed cross bracing structures and a tie rod structure connected between two adjacent cross bracing structures. The intersection of the plurality of cross bracing structures serves as a rigid connection point between the central tower column and the lower balance column. The upper side cables and the lower side cables are arranged in layers at different heights. A plurality of cable nodes are arranged along the length direction of the central tower column and a plurality of cable nodes are correspondingly arranged on the cross bracing structure. The buoy is arranged at the far end of each cross bracing structure. Some cross bracing structures are arranged away from the central tower column and the center of gravity of the floating platform is adjusted by increasing their length or counterweight. A single-point mooring system is also arranged on the rigid frame, and the single-point mooring system comprises a mooring rope and a mooring foundation.

2. The self-balancing wind power floating platform according to claim 1 is characterized in that: The central tower column is a truss structure or a tubular structure.

3. The self-balancing wind power floating platform according to claim 1 or 2 is characterized in that: The lower balance column is a truss structure or a tubular structure, and is provided with a plurality of cable nodes along the length direction. A counterweight block is also provided at the bottom end of the lower balance column.

4. The self-balancing wind power floating platform according to claim 1 is characterized in that: The central tower column is in an A-shape, the lower balance column is in a V-shape, and two rigid connection points for connecting the central tower column and the lower balance column are arranged on the rigid frame.

5. The self-balancing wind power floating platform according to claim 1 is characterized in that: Shock-absorbing dampers are arranged at both ends of each cable.

6. The self-balancing wind power floating platform according to claim 1 is characterized in that: Each of the upper side cables and / or the lower side cables is in a single cable form or a multi-cable composite form.

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