A dish-shaped offshore photovoltaic power generation device based on tensegrity and installation method

Abstract

The present invention discloses a dish-shaped offshore photovoltaic power generation device based on tension integration and an installation method, which is mainly composed of a floating base frame and a dish-shaped dome; the floating base frame includes spirally arranged buoyancy pressure bars, top horizontal cables connecting adjacent common nodes in sequence, bottom horizontal cables connecting the bottom ends of adjacent buoyancy pressure bars in sequence, and vertical cables connecting the common nodes with the bottom ends of adjacent buoyancy pressure bars, which are fixed to the load-bearing columns in the center of the floating base frame through radial cables; the dish-shaped dome is formed by tensioning a number of annular cables, oblique cables, positioning cables and vertical pressure bars according to a certain rule, and its appearance is dish-shaped; the special appearance of the top dish-shaped dome of the present invention not only improves the space utilization rate, but also can achieve a good focusing effect in a certain period of time, and the load-bearing column transmits part of the external force exerted on the dish-shaped dome to the lower end of the floating base frame, thereby improving the bearing capacity of the device, and the device is a tensegrity structure, light in weight, less in consumables, and has better economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore structures and photovoltaic power generation, and in particular to a tensegrity-based dish-shaped offshore photovoltaic power generation device and an installation method thereof. Background Art

[0002] Since the beginning of the 21st century, influenced by the fossil energy crisis and energy conservation and emission reduction policies, people have become keen on the development and utilization of new energy, and photovoltaic power generation has become the focus of new energy development and utilization. At present, the development and application of photovoltaic systems are mainly concentrated on land. With the development of photovoltaic technology, floating photovoltaic power generation technology on water has attracted the attention of research institutions and new energy development companies around the world due to its advantages of saving land resources, increasing power generation, and reducing water surface evaporation. It has become the expansion direction of photovoltaic power generation applications in the future.

[0003] In the related art, Chinese patent application number CN114215700A discloses a tensile integral marine platform for offshore wind power generation, including tension legs, platform cables, bottom transverse cables, movable platforms, oblique cables, arc-shaped support pipes, central columns, connection nodes, radial cables, top transverse cables, top support rods, top oblique cables and transverse reinforcement cables; its external main frame includes four arc-shaped support pipes, oblique cables connecting the top node with the bottom node of the adjacent rod, and top transverse cables and bottom transverse cables connecting the top and bottom nodes of the adjacent two rods respectively; the internal movable platform is connected to the external main frame through the platform cable, consuming part of the platform's remaining buoyancy to tighten it and form a tensioning structure. The disadvantage of the related art is that when used in the field of solar photovoltaic power generation, the construction cost is too high, it is difficult to build in pieces on the sea surface, the overall height is high, it has a large area of ​​shady side, and the light energy absorption efficiency is low.

[0004] At the same time, the current dish-type photovoltaic power generation devices on land, such as Chinese patent application number CN202628412U, are mostly dish-shaped mirror reflections and automatic sun-tracking structures. They are expensive to build and difficult to repair when encountering severe weather at sea. Once damaged, the losses are huge.

[0005] Therefore, the present application overcomes the drawbacks of the above-mentioned prior art, improves its structure on this basis, and provides a new offshore photovoltaic power generation device for offshore photovoltaic power generation to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a dish-shaped offshore photovoltaic power generation device and installation method based on tensegrity, which utilizes the tensegrity structure to reduce the weight of the device and reduce the production cost, increases the space utilization of solar photovoltaic panels through the dish-shaped dome, and improves the solar energy conversion rate through concave focusing.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a dish-shaped offshore photovoltaic power generation device based on tensegrity. The floating chassis formed by tensioning cables and rods can reduce material costs and device weight while maintaining a certain load-bearing capacity. The use of a dish-shaped cable dome structure increases the coverage rate per unit area of ​​photovoltaic panels, and its dish surface can produce a certain concentration effect in a certain period of time, thereby improving the solar energy conversion rate.

[0008] The present invention provides a dish-shaped offshore photovoltaic power generation device based on tensegrity, including a floating frame floating on the sea surface and a dish-shaped dome installed above the floating frame. The floating frame is provided with buoyancy by six buoyancy pressure rods, and the six vertices of the dish-shaped dome are respectively connected to the six common nodes on the top of the floating frame through an oblique cable and a positioning cable. The dish-shaped dome is prestressed by increasing the length of the vertical pressure rod, so that the dish-shaped dome forms a taut dish surface, the bottom end of which is connected to the top node of the load-bearing column, and the bottom node of the load-bearing column transfers part of the external load on the top of the formed dish-shaped dome to the lower end of the floating frame through three radial lower cables, and the top node is limited by three radial upper cables. The upward displacement.

[0009] The floating chassis is in the shape of a spiral hexagonal prism as a whole, including six bottom horizontal cables, three radial lower cables, six buoyancy bars, three radial upper cables, six vertical cables, six common nodes, six top horizontal cables, a bottom node, a load-bearing column and a top node. The six buoyancy bars are hollow inside, with a larger outer diameter from the lower end to the middle, and a gradually decreasing outer diameter from the middle to the top. The lower end is distributed in a regular hexagon, and the rod body is arranged in a spiral along the same direction and the same axis. The six common nodes are located at the top of the buoyancy bars and are distributed in a regular hexagon. The bottom cables connect the lower ends of adjacent buoyancy bars in sequence, the top horizontal cables connect the adjacent common nodes in sequence, and the vertical cables connect the common nodes to the lower ends of adjacent buoyancy bars.

[0010] The disc-shaped dome comprises a plurality of annular load-bearing cables, a plurality of oblique cables, a plurality of positioning cables, a plurality of annular cables, a plurality of vertical compression rods and a central compression rod. The disc-shaped dome is in the shape of a disc that first bulges inward from the periphery and then concave. The annular cables sequentially connect the bottom ends of all the annularly adjacent vertical compression rods. The top and bottom ends of the outermost circle of vertical compression rods are respectively connected to a common node through an oblique cable and a positioning cable. The top ends of all other vertical compression rods are connected to the top ends of the annularly adjacent vertical compression rods through two annular load-bearing cables and are connected to the bottom ends of the radially adjacent vertical compression rods through an oblique cable. The bottom ends are connected to the top ends of the radially adjacent vertical compression rods through two positioning cables.

[0011] The load-bearing column is hollow inside and is located in the center of the floating frame. Its bottom node is lower than the floating frame and is connected to the lower ends of three non-adjacent buoyancy pressure bars through three radial down cables. The top node is connected to the disc dome and is connected to the lower ends of the three buoyancy pressure bars not connected to the radial down cables through three radial up cables.

[0012] All of the bottom horizontal cables are the same length as the top horizontal cables.

[0013] The top end of the central compression rod is connected to the bottom end of the innermost circle vertical compression rod through six oblique cables, and the bottom end is fixed to the top node of the load-bearing column and connected to the bottom end of the innermost circle vertical compression rod through six positioning cables.

[0014] The central pressure rod and the vertical pressure rod do not intersect each other and are only subjected to pressure, and the annular load-bearing cables, oblique cables, positioning cables, and annular cables are only subjected to tension.

[0015] The solar photovoltaic panel is installed between two adjacent annular load-bearing cables, the distance between the two adjacent annular load-bearing cables is the same, the inner side of the outermost solar photovoltaic panel is higher than the outer side, and the outer sides of the remaining solar photovoltaic panels are higher than the inner sides.

[0016] A method for installing a dish-shaped offshore photovoltaic power generation device comprises the following steps:

[0017] Step a, connecting the bottom ends and common nodes of the six buoyancy pressure bars in sequence to form a hexagonal prism, rotating the six common nodes in the same direction to just above the bottom ends of the adjacent buoyancy pressure bars in the same direction and connecting them through vertical cables, and the floating base frame is formed by reducing the tension of the vertical cables;

[0018] Step b, connecting the positioning cables from the central intersection to six common nodes in six directions respectively, installing the bottom ends of the outermost circle vertical compression rods at the corresponding positions of the positioning cables, and connecting the top ends in turn through the annular cables in pairs and through six oblique cables to the six common nodes, and stretching the outermost circle structure into shape by increasing the length of the vertical compression rods or shortening the oblique cables, and installing the remaining vertical compression rods in accordance with this method;

[0019] Step c, the load-bearing column controls the displacement of the bottom node from three directions by changing the length of the three radial lower cables, and controls the displacement of the top node from three directions by changing the length of the three radial upper cables. The six cables form two opposite forces on the load-bearing column in the Z-axis direction. Changing the difference in the force can control the vertical position of the load-bearing column so that its top node is connected to the bottom end of the central pressure rod.

[0020] The step a further comprises: a relative twist angle between the top and the bottom of the floating frame after tensioning θ The following formula can be used for calculation:

[0021]

[0022] Among them, the relative twist angle θ is the angle between the line segments Oa and Of, point O is the bottom rotation center of the floating frame, point a is the bottom end point of the vertical cable, point f is the projection point of the vertical cable vertex b projected to the bottom of the floating frame, and ω is the number of buoyancy bars.

[0023] Compared with the related art, the present invention has the following beneficial effects:

[0024] (1) The floating chassis is a helical hexagonal tensegrity structure, and its relative twist angle is calculated by the formula θ , has good load-bearing capacity, is light in weight, has certain elasticity, and can cope with complex offshore climate environments;

[0025] (2) The bottom end of the dish-shaped dome is connected to a load-bearing column. When the photovoltaic dome is subjected to a load above, part of the load can be transferred to the bottom of the floating frame through the load-bearing column using three radial downward cables. When the photovoltaic dome is subjected to a load below, the deadweight of the load-bearing column can offset part of the load, or part of the load can be transferred to the bottom of the floating frame through three radial upward cables, thereby improving the structural reliability of the device.

[0026] (3) The dish dome is dish-shaped. When the irradiated light reaches a certain angle, it can absorb the light for a second time through refraction. At the same time, a higher temperature area is formed above the concave part of the dish surface, which improves the solar energy conversion rate. The emergence of dish-shaped offshore photovoltaic power generation devices has enriched the types of existing offshore photovoltaic power generation devices and broadened the application scope of tensegrity structures. Specifically, it has the advantages of low material consumption, light weight, stable structure, certain elasticity, and high solar energy conversion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0028] Figure 2 A top view of the present invention;

[0029] Figure 3 It is a front view of the present invention;

[0030] Figure 4 is a three-dimensional schematic diagram of the floating chassis of the present invention;

[0031] Figure 5 This is a front view of the floating chassis of the present invention;

[0032] Figure 6 A three-dimensional structural cross-sectional view of the dish-shaped dome of the present invention;

[0033] Figure 7 It is a front view of the dish-shaped dome of the present invention;

[0034] Figure 8 A three-dimensional structural cross-sectional view of another embodiment of the dish-shaped dome of the present invention;

[0035] Fig. 9 It is a calculation diagram of the floating chassis of the present invention;

[0036] The following are marked in the figure:

[0037] 1- bottom horizontal cable, 2- radial lower cable, 3- buoyancy pressure bar, 4- radial upper cable, 5- vertical cable, 6- common node, 7- top horizontal cable, 8- bottom node, 9- load-bearing column, 10- top node, 11- annular load-bearing cable, 12- oblique cable, 13- positioning cable, 14- annular cable, 15- vertical pressure bar, 16- central pressure bar, 17- solar photovoltaic panel. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0039] like Figure 1-3 As shown, the present invention provides a dish-shaped offshore photovoltaic power generation device based on tensegrity, including a floating frame floating on the sea surface and a dish-shaped dome installed above the floating frame. The floating frame is provided with buoyancy by six buoyancy pressure bars 3, and the six vertices of the dish-shaped dome are respectively connected to the six common nodes 6 on the top of the floating frame through an oblique cable 12 and a positioning cable 13. The dish-shaped dome is prestressed by increasing the length of the vertical pressure bar 15, so that the dish-shaped dome forms a taut dish surface, and its bottom end is connected to the top node 10 of the load-bearing column 9. The bottom node 8 of the load-bearing column 9 transfers part of the external load on the upper part of the formed dish-shaped dome to the lower end of the floating frame through three radial lower cables 2, and the top node 10 is limited by three radial upper cables 4. The upward displacement.

[0040] like Figure 4-5As shown, the floating frame is in the shape of a spiral hexagonal prism as a whole, and the six buoyancy bars 3 form an overall skeleton. The buoyancy bars 3 are hollow inside, with a larger outer diameter from the lower end to the middle, and gradually decrease in outer diameter from the middle to the top. The lower end is distributed in a regular hexagon, and the rod body is arranged in a spiral along the same direction and the same axis. Six common nodes 6 are located at the top of the buoyancy bars 3 and are distributed in a regular hexagon. The bottom cable 1 connects the lower ends of adjacent buoyancy bars 3 in sequence, the top horizontal cable 7 connects the adjacent common nodes 6 in sequence, and the vertical cable 5 connects the common node 6 to the lower ends of adjacent buoyancy bars 3. The load-bearing column 9 is hollow inside and located in the center of the floating frame. Its bottom node 8 is lower than the floating frame and is connected to the lower ends of three non-adjacent buoyancy bars 3 through three radial lower cables 2. The top node 10 is connected to the dish dome and is connected to the lower ends of the three buoyancy bars 3 that are not connected to the radial lower cables 2 through three radial upper cables 4.

[0041] like Figure 6-7 As shown, the dish-shaped dome is a dish-shaped structure that first bulges inward and then concave from the periphery. The annular cables 14 sequentially connect the bottom ends of all the annularly adjacent vertical compression rods 15. The top and bottom ends of the outermost circle vertical compression rods 15 are connected to the common node 6 through an oblique cable 12 and a positioning cable 13 respectively. The top ends of all other vertical compression rods 15 are connected to the top ends of the annularly adjacent vertical compression rods 15 through two annular load-bearing cables 11 and to the bottom ends of the radially adjacent vertical compression rods 15 through an oblique cable 12. The bottom ends are connected to the top ends of the radially adjacent vertical compression rods 15 through two positioning cables 13. The top end of the central compression rod 16 is connected to the bottom ends of the innermost circle vertical compression rods 15 through six oblique cables 12, and the bottom end is fixed to the top node 10 of the load-bearing column 9 and connected to the bottom ends of the innermost circle vertical compression rods 15 through six positioning cables 13. The central compression rod 16 and the vertical compression rod 15 do not intersect each other and are only subjected to pressure, and the annular load-bearing cables 11, the oblique cables 12, the positioning cables 13, and the annular cables 14 are all only subjected to tension. The solar photovoltaic panel 17 is installed between two adjacent annular load-bearing cables 11, and the distance between the two adjacent annular load-bearing cables is the same. The inner side of the outermost solar photovoltaic panel 17 is higher than the outer side, and the outer sides of the remaining solar photovoltaic panels are higher than the inner sides.

[0042] In this embodiment, the floating frame is formed by tensioning non-intersecting buoyancy bars and multiple cables. It is a tensile integral structure with a light weight and certain elasticity and impact resistance. The disc dome transfers part of the external load from above to the bottom of the floating frame through load-bearing columns and three radial downward cables. When the bottom of the disc dome is subjected to external loads, the displacement of the top node can be limited by three radial upper cables, thereby improving the structural reliability of the device. The concave shape of the disc dome can refract the irradiated light in a certain period of time, thereby absorbing solar energy for a second time, and improving the solar energy absorption rate of the device. The oblique cables are connected from the top of the inner circle vertical bars to the bottom of the outer circle vertical bars, which can effectively improve the wind load resistance of the back of the disc dome.

[0043] As another embodiment of the present invention, as shown in FIG8, under the premise that other embodiments remain unchanged,

[0044] The dish dome is in the shape of a dish that first bulges inward and then concave from the periphery. The common node 6 is connected to the top and bottom of the outermost vertical compression rod 15 through an oblique cable 12 and a positioning cable 13 respectively. The tops of all other vertical compression rods 15 are connected to the tops of radially adjacent vertical compression rods 15 through two positioning cables 13 and to the tops of circumferentially adjacent vertical compression rods 15 through two annular load-bearing cables 11. The bottoms are connected to the tops of radially adjacent vertical compression rods 15 through an oblique cable 12. The annular cables 14 sequentially connect the bottoms of all circumferentially adjacent vertical compression rods 15. The oblique cables are connected from the tops of the outer circle vertical compression rods to the bottoms of the inner circle vertical compression rods, which can effectively improve the load-bearing capacity of the front of the dish dome.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the above description is only for explaining the principles of the present invention, and that various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and these changes and improvements all fall within the scope of the present invention claimed for protection.

[0046] The protection scope of the present invention is defined by the following claims and their equivalents.

Claims

1. A dish-shaped offshore photovoltaic power generation device based on tensegrity, characterized in that: It includes a floating base frame floating on the sea surface and a dish-shaped dome installed above the floating base frame; The floating frame is provided with buoyancy by six buoyancy bars (3), and the six vertices of the dish-shaped dome are respectively connected to six common nodes (6) at the top of the floating frame through an oblique cable (12) and a positioning cable (13); The dish-shaped dome is prestressed by increasing the length of the vertical compression rod (15) so that the dish-shaped dome forms a taut dish surface, the bottom end of which is connected to the top node (10) of the load-bearing column (9). The bottom node (8) of the load-bearing column (9) transmits part of the external load on the upper part of the formed dish-shaped dome to the lower end of the floating frame through three radial lower cables (2), and the top node (10) limits the upward displacement through three radial upper cables (4); The floating base frame is in the shape of a spiral hexagonal prism as a whole, and comprises six bottom horizontal cables (1), three radial lower cables (2), six buoyancy pressure rods (3), three radial upper cables (4), six vertical cables (5), six common nodes (6), six top horizontal cables (7), a bottom node (8), a load-bearing column (9) and a top node (10); The six buoyancy pressure rods (3) are hollow inside, with a larger outer diameter from the lower end to the middle, and a gradually decreasing outer diameter from the middle to the top, and the lower end is distributed in a regular hexagon, and the rod body is spirally arranged along the same direction and the same axis, and the six common nodes (6) are located at the top of the buoyancy pressure rod (3) and are distributed in a regular hexagon; The bottom horizontal cable (1) connects the lower ends of adjacent buoyancy bars (3) in sequence, the top horizontal cable (7) connects the adjacent common nodes (6) in sequence, and the vertical cable (5) connects the common node (6) to the lower ends of adjacent buoyancy bars (3).

2. The dish-shaped offshore photovoltaic power generation device according to claim 1, characterized in that: The load-bearing column (9) is hollow inside and is located in the center of the floating frame. Its bottom node (8) is lower than the floating frame and is connected to the lower ends of three non-adjacent buoyancy bars (3) through three radial down-stayed cables (2). The top node (10) is connected to the disc-shaped dome and is connected to the lower ends of the three buoyancy bars (3) not connected to the radial down-stayed cables (2) through three radial up-stayed cables (4).

3. The dish-shaped offshore photovoltaic power generation device according to claim 2, characterized in that: The disc-shaped dome comprises a plurality of annular load-bearing cables (11), oblique cables (12), positioning cables (13), annular cables (14), vertical compression rods (15) and a central compression rod (16); the disc-shaped dome is in the shape of a disc that first bulges inward from the periphery and then concave; the annular cables (14) sequentially connect the bottom ends of all the annularly adjacent vertical compression rods (15); the top and bottom ends of the outermost vertical compression rods (15) are respectively connected to a common node (6) through an oblique cable (12) and a positioning cable (13); the top ends of all other vertical compression rods (15) are connected to the top ends of the annularly adjacent vertical compression rods (15) through two annular load-bearing cables (11) and are connected to the bottom ends of the radially adjacent vertical compression rods (15) through an oblique cable (12); and the bottom ends are connected to the top ends of the radially adjacent vertical compression rods (15) through two positioning cables (13).

4. The dish-shaped offshore photovoltaic power generation device according to claim 3, characterized in that: The top end of the central compression rod (16) is connected to the bottom end of the innermost vertical compression rod (15) through six oblique cables (12), and the bottom end is fixed to the top node (10) of the load-bearing column (9) and connected to the bottom end of the innermost vertical compression rod (15) through six positioning cables (13); The central pressure rod (16) and the vertical pressure rod (15) do not intersect each other and are only subjected to pressure, while the annular load-bearing cables (11), the oblique cables (12), the positioning cables (13), and the annular cables (14) are only subjected to tension.

5. The dish-shaped offshore photovoltaic power generation device according to claim 4, characterized in that: The solar photovoltaic panel (17) is installed between two adjacent annular load-bearing cables (11), the distance between the two adjacent annular load-bearing cables is the same, the inner side of the outermost solar photovoltaic panel (17) is higher than the outer side, and the outer sides of the remaining solar photovoltaic panels are higher than the inner sides.

6. A method for installing a disc-shaped offshore photovoltaic power generation device, controlling the tensioning and forming of the disc-shaped offshore photovoltaic power generation device according to any one of claims 1 to 5, characterized in that: The following steps are included: Step a, connecting the bottom ends and common nodes (6) of the six buoyancy pressure bars (3) in sequence to form a hexagonal prism, rotating the six common nodes (6) in the same direction to just above the bottom ends of the adjacent buoyancy pressure bars (3) in the same direction and connecting them through vertical cables (5), and the floating base frame is formed by reducing the tension of the vertical cables (5); Step b, connecting the positioning cables (13) from the central intersection to the six common nodes (6) in six directions respectively, the bottom end of the outermost circle vertical pressure rod (15) is installed at the corresponding position of the positioning cables (13), the top end is connected in pairs through the annular cables (14) in turn and connected to the six common nodes (6) through six oblique cables (12), the outermost circle structure is stretched into shape by increasing the length of the vertical pressure rod (15) or shortening the oblique cables (12), and the remaining vertical pressure rods (15) are installed according to this method; Step c, the load-bearing column (9) controls the displacement of the bottom node (8) from three directions by changing the length of the three radial lower cables (2), and controls the displacement of the top node (10) from three directions by changing the length of the three radial upper cables (4). The six cables form two opposite forces on the load-bearing column (9) in the Z-axis direction. By changing the difference in the force, the vertical position of the load-bearing column (9) can be controlled so that its top node (10) is connected to the bottom end of the central pressure rod (16).

7. A method for installing a disc-shaped offshore photovoltaic power generation device as claimed in claim 6, characterized in that: The step a further includes that the relative twist angle θ between the top and the bottom of the floating chassis after tensioning can be calculated by the following formula: The relative twist angle θ is the angle between the line segments Oa and Of, point O is the bottom rotation center of the floating frame, point a is the bottom end point of the vertical cable (5), point f is the projection point of the vertex b of the vertical cable (5) projected to the bottom of the floating frame, and ω is the number of buoyancy bars (3).

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