Tension cable net floating type photovoltaic platform

Abstract

The invention discloses a tension cable net floating type photovoltaic platform, and belongs to the technical field of ocean engineering, the platform comprises an annular frame and a buoyancy ring which are sequentially arranged from top to bottom, a central stand column is vertically arranged in the annular structure in a penetrating mode, and the two ends of the central stand column are annularly and randomly connected with the annular frame and the buoyancy ring through a plurality of prestress connecting bodies respectively; the tension cable net floating type photovoltaic platform is in a semi-submersible type, the buoyancy ring is located under the water surface to provide main buoyancy, the annular frame is located on the water surface, and the photovoltaic system receives sunlight irradiation on the platform surface to generate power. The distribution of the waterline area is far away from the central position, so that the photovoltaic platform structure is good in self-stability, and meanwhile, the buoyancy ring adopts a fusiform structural design, so that the steel consumption is reduced, the purpose of a lightweight structure is achieved, and the construction cost of the structural design is further reduced.

Description

Technical Field

[0001] The present invention belongs to the field of marine engineering technology, and more specifically, particularly relates to a tension cable net floating photovoltaic platform. Background Art

[0002] Since the 20th century, with the rapid development of social economy, the demand for energy in countries around the world has increased dramatically. In order to solve the depletion of non-renewable energy resources and the deteriorating environment, it has become a consensus among countries around the world to find alternative, renewable and clean new energy. As the main body of the earth's surface, the ocean not only has rich resources such as aquatic products and oil, but also contains huge energy. Ocean energy mainly exists in the form of tides, waves, temperature differences, salinity gradients, ocean currents, etc. The utilization of ocean energy has great potential, and it is of great significance to increase the development and research of ocean energy.

[0003] With the rapid advancement of the energy revolution, photovoltaics, as a relatively mature form of renewable energy generation, has developed rapidly. Moreover, under the current development form, it has begun to develop from land to sea and has formed a certain scale in shallow sea areas. However, in the long run, as the development intensity of photovoltaic resources in intertidal zones and offshore areas gradually saturates, it will be an inevitable trend for offshore photovoltaics to move from offshore to deep sea. Therefore, the research on floating photovoltaic related systems has very important theoretical and practical significance.

[0004] However, due to the frequent wind and waves on the sea, the photovoltaic platform's ability to resist wind and waves faces great challenges. In view of this, further optimization is needed to improve the stability of the photovoltaic platform. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a tension cable net floating photovoltaic platform, which provides main buoyancy through a buoyancy ring. The circular waterline area distribution greatly improves the stability radius of the buoyancy ring and the stability height of the overall structure. The structural integrity of the buoyancy ring is further strengthened by the tension cable net. On this basis, a photovoltaic system is arranged above the buoyancy ring to solve the technical problems described in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a tension cable net floating photovoltaic platform, comprising an annular frame and at least one buoyancy ring arranged in sequence from top to bottom, the annular frame and the buoyancy ring are stacked at intervals and connected together through connecting columns to form an annular structure, a central column is vertically penetrated in the annular structure, the annular frame and the buoyancy ring are respectively inclined in the upward and / or downward directions through a plurality of prestressed connectors and connected to the central column in an annular distribution manner, a table top is laid on the upper plane of the annular frame, and a photovoltaic system is installed on the table top.

[0007] Optionally, the prestressed connecting body is a prestressed cable or a prestressed rigid rod.

[0008] Optionally, among the prestressed connecting bodies of the annular structure in the up and down directions, the upper one is the prestressed cable and the lower one is the prestressed rigid rod.

[0009] Optionally, the prestressed cable is a CFRP cable.

[0010] Optionally, both ends of the prestressed connecting body are connected by means of hinges.

[0011] Optionally, the planar area of the tabletop is greater than or equal to the planar area of the annular frame.

[0012] Optionally, the tabletop is circular, and the diameter of the tabletop is greater than or equal to the diameter of the annular frame.

[0013] Optionally, a plurality of uniformly distributed stay-connecting bodies are arranged at the edge of the tabletop. The plurality of stay-connecting bodies are divided into two groups according to the odd and even numbers of the arrangement. One group is connected to the buoyancy ring in the circumferential direction, and the other group is connected to the top of the central column in the circumferential direction.

[0014] Optionally, the tabletop is designed with a hollow structure.

[0015] Optionally, the top of the central column is located on the lower plane of the tabletop.

[0016] The present invention provides a tension cable-net floating photovoltaic platform, which has the following beneficial effects:

[0017] 1. Most of the buoyancy of the floating platform is provided by the buoyancy ring structure, so that the distribution of the waterline area is far from the central position, making the photovoltaic platform structure more self-stable.

[0018] 2. The prestressed cable is made of CFRP, which has the properties of light weight, high strength, corrosion resistance and fatigue resistance. Its performance is far higher than that of traditional steel cables and synthetic fiber ropes. In addition, the long-term relaxation performance of CFRP cables is much lower than that of synthetic fiber ropes. In a floating structure, there will be no problem of large tensile force attenuation leading to structural failure.

[0019] 3. By adding a prestressed connecting body to connect the central column and the buoyancy ring, stiffness is provided for the composed floating foundation, which helps to reduce the steel consumption as a whole, achieve the purpose of lightweight structure, and further reduce the construction cost of the structural design.

[0020] 4. A spindle-shaped lightweight structure is formed by the buoyancy ring, prestressed connecting body, etc., which is convenient for processing, transportation and installation. The installation of the lightweight structure only requires conventional equipment, and there are no special requirements for construction operations, reducing the installation risk. Description of the Drawings

[0021] Figure 1 Schematic structural diagram of the tension cable net floating photovoltaic platform provided in this embodiment;

[0022] Figure 2 Schematic structural diagram of the tension cable net floating photovoltaic platform provided in this embodiment;

[0023] Figure 3 Simplified schematic diagram of the first axisymmetric structure of the structural connection form provided in this embodiment;

[0024] Figure 4 Simplified schematic diagram of the second axisymmetric structure of the structural connection form provided in this embodiment;

[0025] Figure 5 Simplified schematic diagram of the third axisymmetric structure of the structural connection method provided in this embodiment;

[0026] Figure 6 Simplified schematic diagram of the fourth axisymmetric structure of the structural connection method provided in this embodiment;

[0027] Figure 7 Schematic structural diagram of the buoyancy ring provided in this embodiment.

[0028] In the figure: 1. Ring frame; 2. Buoyancy ring; 21. Protective shell; 22. Buoyancy block; 23. Ring skeleton; 3. Connecting column; 4. Prestressed connecting body; 41. Prestressed cable; 42. Prestressed rigid rod; 5. Tabletop; 6. Photovoltaic system; 7. Mooring cable; 8. Fixed part; 9. Central column; 10. Cable stayed connecting body. Specific implementation manners

[0029] The following further describes in detail the implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] The technical solution provided by the present invention: A tension cable net floating photovoltaic platform, as Figure 1 , Figure 2 shown, the platform includes a ring frame 1 and a buoyancy ring 2 arranged in sequence from top to bottom, and the buoyancy ring 2 provides the main buoyancy for the platform. Among them, the ring frames 1 and the buoyancy rings 2 are stacked at intervals and connected together by connecting columns 3 to form an annular structure. Preferably, the center projections of all the ring frames 1 and the buoyancy rings 2 overlap. A central column 9 is vertically penetrated in the annular structure, and the ring frame 1 and the buoyancy ring 2 are connected to the central column 9 by a plurality of prestressed connecting bodies 4 respectively in two directions of upward or / and downward and distributed in a ring shape, so that the whole forms a spindle shape. Among them, both ends of the prestressed connecting body 4 are connected by a hinge method, which is beneficial to the adjustment and distribution of prestress. The specific connection form can be referred to as Figure 3Figure 4 in the form shown, and the specific form selected depends on the actual force conditions and application scenarios.

[0031] On the upper plane of the ring frame 1, a tabletop 5 is laid, and a photovoltaic system 6 is installed on the tabletop 5. The photovoltaic system 6 includes photovoltaic panels, circuit structures, etc. In actual use, the tension cable-net floating photovoltaic platform is semi-submersible. When it is placed on the sea surface, the buoyancy ring 2 is located underwater to provide the main buoyancy, while the ring frame 1 is located above the water surface, and the photovoltaic system 6 generates electricity on the tabletop 5 by receiving sunlight. The ring frame 1 not only forms a photovoltaic installation platform but also plays a role in increasing the overall structural strength and stiffness.

[0032] This buoyancy ring 2 structure provides most of the buoyancy of the floating platform. The distribution of the waterline area is far from the central position, and accordingly, the stability radius of the buoyancy ring 2 and the stability height of the overall structure are greatly improved. Under the condition of a large-diameter buoyancy ring 2, the structural self-stability is better. At the same time, multiple dense prestressed connectors 4 are connected, and this redundant design can also ensure the robustness or strength of the cable-net structure.

[0033] The prestressed connectors 4 of the ring structure in the up and down directions are prestressed cables 41 or prestressed rigid rods 42, or a mixture of the two forms.

[0034] However, considering that the photovoltaic system 6 needs to receive sunlight as much as possible, in order to reduce shading, as Figure 1 shown, among the prestressed connectors 4 of the ring structure in the up and down directions, the upper one is designed as a prestressed cable 41 and the lower one is designed as a prestressed rigid rod 42. The advantage of doing this is that it can reduce the shading area and increase the photovoltaic power generation efficiency. In addition, this differential design is beneficial to the "permanence" of the structure. In use, the prestressed connector 4 needs to have the properties of corrosion resistance, small relaxation, and low creep. Therefore, when the prestressed connector 4 is a prestressed cable 41, the prestressed cable 41 is selected as a CFRP cable (Carbon Fiber Reinforced Polymer).

[0035] As Figure 1 shown, in order to further increase the sunlight received by the photovoltaic system 6, it is designed such that the planar area of the tabletop 5 is greater than or equal to the planar area of the ring frame 1. A larger tabletop 5 area can lay more photovoltaic systems 6, thereby increasing the photovoltaic power generation efficiency. And in an ideal scheme, the tabletop 5 is designed as a circle, and the diameter of this tabletop 5 is greater than or equal to the diameter of the ring frame 1, so as to obtain a larger tabletop 5 area.

[0036] As Figure 5As shown, when the planar area of the tabletop 5 is larger than that of the annular frame 1, the firmness of the tabletop 5 needs to be considered. A plurality of uniformly distributed diagonal tension connectors 10 are arranged at the edge of the tabletop 5. The plurality of diagonal tension connectors 10 are divided into two groups according to the odd and even numbers of the arrangement. One group is connected to the buoyancy ring 2 circumferentially, and the other group is connected to the top of the central column 9 circumferentially. The spaced arrangement can make the force evenly distributed. For example: if the number of the diagonal tension connectors 10 is 9, the diagonal tension connectors 1 arranged at 1, 3, 5, 7, 9 are connected to the central column 9, and the diagonal tension connectors 1 arranged at 2, 4, 6, 8 are connected to the buoyancy ring 2.

[0037] In addition, the diagonal tension connectors 10 connected to the central column 9 adopt prestressed cables 41, and the diagonal tension connectors 10 connected to the buoyancy ring 2 adopt prestressed rigid rods 42. The reason is similar to the setting type of the prestressed connector 4, which can reduce the sunlight blockage. The connection points corresponding to the prestressed cables 41 and the prestressed rigid rods 42 on the edge of the tabletop 5 are located at the same position, which can reduce the additional prestress of the tabletop 5 and make the tabletop 5 form a better stress layout.

[0038] In addition, there is another scheme for the photovoltaic system 6 to receive sunlight as much as possible, such as Figure 6 shown, that is, nothing is set on the tabletop 5, that is, the tabletop 5 is set on the top of the central column 9. At this time, the top of the central column 9 is located on the lower plane of the tabletop 5. The upper end of the central column 9 is connected to the buoyancy ring 2 circumferentially through the prestressed cable 41, and the lower end of the central column 9 is connected to the buoyancy ring 2 and the annular frame 1 circumferentially through the prestressed rigid rod 42. In this way, there is no object on the tabletop 5 that can block sunlight.

[0039] Regarding the tabletop 5, considering that the tension cable net floating photovoltaic platform needs to be used on the sea surface with relatively large wind and waves, and the area of the tabletop 5 is large, the tabletop 5 is designed in a hollow form, that is, holes through which wind can pass are designed on the tabletop 5, which can reduce the impact of wind and waves on the entire photovoltaic platform and make its stability better.

[0040] Regarding the buoyancy ring 2, as Figure 7 shown, the buoyancy ring 2 is composed of an outer protective shell 21, a middle buoyancy block 22 and an inner annular skeleton 23. The outer protective shell 21 is a hard plastic shell of polyurethane. The material of the middle buoyancy block 22 can be one or a combination of hollow microsphere composite materials, composite plastics, and chemical foam composite materials. The inner annular skeleton 23 is made of conventional steel processed in sections and assembled into a whole in the form of a flange plate, or welded.

[0041] The form of the buoyancy ring 2: The form of the annular skeleton 23 is diverse and can be tubular, truss, or box-shaped.

[0042] When the buoyancy ring 2 is combined with the annular frame 1 into a truss form through the connecting columns 3 and / or the connecting diagonal rods, the strength and stiffness of the combined annular structure will be greatly improved compared to a single ring body.

[0043] The buoyancy blocks 22 can be prefabricated in a factory or wrapped on-site (self-floating steel pipes) after being towed to the site.

[0044] In order to endow the floating foundation with overall stiffness, the prestressed connectors 4 arranged regularly in the circumferential direction are tensioned with sufficient tensile stress reserve to ensure that it is always in a stable state under the working condition. The optimal inclination angle of the prestressed connector 4 with the horizontal plane is 55°.

[0045] Considering the problem of the photovoltaic platform drifting with the wind and waves, as Figure 1 Figure 2 shown, a mooring cable 7 is connected to the annular structure, and the other end of the mooring cable 7 is connected to the fixing part 8, which is beneficial to the traction and fixation of the photovoltaic platform by the mooring cable 7. The mooring cable 7 can be made of CFRP material, which can effectively prevent the corrosion of the cable body. The fixing part 8 can be an object fixed to the bottom of the water such as a gravity block or a drag anchor.

[0046] In order to ensure the stability of the traction, the mooring cable 7 is connected to the lower side of the outer wall of the lowermost buoyancy ring 2 in the annular structure, and this design can effectively prevent the photovoltaic platform from swinging.

[0047] In order to facilitate the transportation and construction of the photovoltaic platform, the annular frame 1, the buoyancy ring 2 and the tabletop 5 are all designed to be assembled. By transporting each assembled component to the designated water area, assembling them on-site, and then assembling the annular frame 1, the buoyancy ring 2 and the tabletop 5 to form the photovoltaic platform. At the same time, for this assembled structure, when a certain component is damaged, it can be replaced again, which is beneficial to the repeated use of the structure.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A tension cable net floating photovoltaic platform, characterized in that: It includes a ring frame (1) and at least one buoyancy ring (2) arranged successively from top to bottom. The ring frame (1) and the buoyancy ring (2) are stacked at intervals and connected together by connecting columns (3) to form a ring structure. A central column (9) is vertically penetrated in the ring structure. The ring frame (1) and the buoyancy ring (2) are connected to the central column (9) by a plurality of prestressed connectors (4) respectively in an inclined manner upward or / and downward and in a circular distribution. A tabletop (5) is laid on the upper plane of the ring frame (1), and a photovoltaic system (6) is installed on the tabletop (5).

2. The tension cable net floating photovoltaic platform according to claim 1, wherein: The prestressed connector (4) is a prestressed cable (41) or a prestressed rigid rod (42).

3. The tension cable net floating photovoltaic platform according to claim 2, wherein: Among the prestressed connectors (4) of the ring structure in the up and down directions, the upper one is the prestressed cable (41), and the lower one is the prestressed rigid rod (42).

4. The tension cable net floating photovoltaic platform according to claim 2 or 3, characterized in that: The prestressed cable (41) is a CFRP cable.

5. The tension cable net floating photovoltaic platform according to any one of claims 1-3, characterized in that: Both ends of the prestressed connector (4) are connected by means of hinges.

6. The tension cable network floating photovoltaic platform according to any one of claims 1-3, characterized in that: The planar area of the tabletop (5) is greater than or equal to the planar area of the ring frame (1).

7. The tension cable net floating photovoltaic platform according to claim 6, characterized in that: The tabletop (5) is circular, and the diameter of the tabletop (5) is greater than or equal to the diameter of the ring frame (1).

8. The tension cable net floating photovoltaic platform according to claim 6, characterized in that: A plurality of uniformly distributed stay connectors (10) are arranged at the edge of the tabletop (5). The plurality of stay connectors (10) are divided into two groups according to the odd and even numbers of the arrangement. One group is connected to the buoyancy ring (2) in the circumferential direction, and the other group is connected to the top of the central column (9) in the circumferential direction.

9. The tension cable net floating photovoltaic platform according to claim 1, characterized in that: The tabletop (5) is designed with a hollow structure.

10. The tension cable network floating photovoltaic platform according to claim 1, characterized in that: The top of the central column (9) is located on the lower plane of the tabletop (5).

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