Middle arch type floating film photovoltaic platform capable of avoiding water accumulation and keeping flexible characteristic

Abstract

The invention discloses a middle arch type floating thin film photovoltaic platform capable of avoiding water accumulation and keeping a flexible characteristic, and relates to the technical field of offshore photovoltaic power generation, the middle arch type floating thin film photovoltaic platform is characterized by comprising a thin film system, the thin film system is of a double-layer thin film structure, and the double-layer thin film comprises an upper-layer thin film and a lower-layer thin film; a middle arch supporting structure is arranged in the double-layer film and comprises an ellipsoidal supporting shell, and the ellipsoidal supporting shell is fixed in the middle of the double-layer film. The invention provides a technical scheme of a middle arch type floating thin film photovoltaic platform aiming at the problem that the offshore flexible photovoltaic platform is easy to wave and accumulate water, so that the platform structure loses efficacy and even sinks, a feasible solution is provided for the water accumulation problem of the thin film platform, and the stability of the offshore flexible photovoltaic platform is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore photovoltaic power generation, and in particular to a mid-arch floating thin-film photovoltaic platform which avoids water accumulation and maintains flexibility. Background Art

[0002] With the advancement of photovoltaic power generation technology and the reduction of costs, the scale of the photovoltaic power generation industry continues to expand. By the end of 2022, the world's cumulative photovoltaic installed capacity will be about 1.2TW. However, large-scale photovoltaic power stations require about 0.016 square kilometers of land per megawatt, which will have a great negative impact on the economic viability of photovoltaic projects in areas and countries with high population density and multiple uses of land. If photovoltaic power stations are deployed in remote areas far away from people, the infrastructure for long-distance power transmission will also add high costs.

[0003] Therefore, with the tightening of onshore photovoltaic space resources and my country's restrictions on freshwater photovoltaic development, offshore areas have become an important strategic space for photovoltaic development. As a new photovoltaic power generation technology, floating photovoltaic systems have solved some of the problems and challenges of land-based photovoltaic systems. Considering the relatively significant wave and current marine environment in the open sea, the traditional water photovoltaic pontoon structure is no longer applicable, and new offshore photovoltaic support structures have begun to gain attention. The more typical ones are rigid floating photovoltaic support structures and flexible thin-film photovoltaic support structures. Among them, the offshore floating flexible thin-film photovoltaic platform has the advantages of low structural weight and mooring stress, low wind resistance, convenient transportation, easy installation, and low cost.

[0004] At present, in the process of offshore application and development, floating thin-film photovoltaic equipment is very prone to wave surfing due to its close proximity to the water surface. The resulting water accumulation problem is an important challenge faced by this type of photovoltaic equipment.

[0005] Therefore, technicians in this field are committed to developing a mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexible characteristics, so as to solve the problem of water accumulation on the thin-film platform and enhance the stability of the offshore flexible photovoltaic platform. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is the problem of water accumulation in the floating thin-film photovoltaic platform in the marine environment.

[0007] To achieve the above-mentioned purpose, the present invention provides a mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexible characteristics, characterized in that it includes a thin film system, the thin film system is a double-layer thin film structure, the double-layer thin film includes an upper thin film and a lower thin film, a mid-arch support structure is provided inside the double-layer thin film, the mid-arch support structure includes an ellipsoidal support shell, and the ellipsoidal support shell is fixed in the middle of the double-layer thin film.

[0008] Furthermore, the outer side of the membrane system is surrounded by a flexible wave-breaking wall with a drainage opening.

[0009] Furthermore, it also includes a floating ring and a mooring device, the membrane system and the flexible wave-breaking wall are connected to the floating ring through a connecting piece, and the floating ring is moored to the seabed through the mooring device.

[0010] Furthermore, the middle arch support structure also includes an upper flexible fixing ring and a lower fixing ring, the upper flexible fixing ring is connected to the upper film, the lower fixing ring is connected to the lower film, and the ellipsoidal support shell is fixed by the upper flexible fixing ring and the lower fixing ring.

[0011] Furthermore, the middle arch support structure also horizontally arranges a circle of vertical tension cables to limit the horizontal displacement of the ellipsoidal support shell, and the upper and lower ends of the tension cables are respectively connected to the upper flexible fixing ring and the lower fixing ring.

[0012] Furthermore, a horizontal fixing ring for limiting horizontal relative rotational angular displacement is also provided on the ellipsoidal supporting shell.

[0013] Furthermore, the edges of the double-layer film are sealed, and air at normal pressure is injected between the double-layer film.

[0014] Furthermore, the ellipsoidal supporting shell is a hollow structure.

[0015] Furthermore, the upper film is coated with a hydrophobic coating.

[0016] Furthermore, the slope of the upper film is 5° to 10°, and the pre-tension of the upper film is greater than the pre-tension of the lower film.

[0017] In view of the problem that the offshore flexible photovoltaic platform is prone to water accumulation due to waves, which may lead to the failure of the platform structure or even sinking, the present invention proposes a technical solution for a mid-arch floating thin-film photovoltaic platform, which provides a practical solution to the water accumulation problem of the thin-film platform and enhances the stability of the offshore flexible photovoltaic platform. Compared with the existing technical solution of draining the accumulated water through a drainage pump, the present design only replaces the drainage pump through structural innovation, reduces the risk of structural failure due to mechanical failure, and reduces the energy consumption of platform operation and maintenance, thereby increasing the total power generation power of the platform. In addition, the component design of the present invention does not require special production processes and has good production implementation feasibility. In summary, the present invention provides a practical commercial application solution for the emerging concept of offshore flexible photovoltaic platforms, which has broad application prospects.

[0018] The beneficial technical effects of the present invention are as follows:

[0019] 1. Thin-film photovoltaic platforms are susceptible to water accumulation caused by waves. The present invention provides a solution for a mid-arch floating thin-film photovoltaic platform, which is similar to the mid-arch of a ship. The center of the film is designed to be elevated to a certain extent, forming a structural feature of low surroundings and high center. When the thin-film photovoltaic platform encounters water accumulation caused by waves and rainfall, the mid-arch design can guide the accumulated water to the side of the thin-film wave-breaking wall.

[0020] 2. To solve the problem of water discharge from the membrane, the present invention designs a wave-breaking wall with drainage holes. A circle of drainage holes is evenly designed at the bottom of the wave-breaking wall. The water accumulated on the side of the membrane wave-breaking wall can be discharged from the membrane without affecting the strength of the wave-breaking wall. The wave-breaking wall not only solves the problem of water discharge, but also can prevent seawater from flowing back into the membrane by the side of the wave-breaking wall with the help of the arch design in the membrane.

[0021] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility according to a preferred embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of a film, a wave-breaking wall, a floating ring, and a connecting piece of a mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility in a preferred embodiment of the present invention;

[0024] Figure 3 It is a horizontal schematic diagram of a middle arch support structure of a middle arch type floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility in a preferred embodiment of the present invention;

[0025] Figure 4 It is an isometric schematic diagram of a middle arch support structure of a middle arch type floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility according to a preferred embodiment of the present invention;

[0026] Figure 5 It is a schematic longitudinal section diagram of a middle arch support structure of a middle arch type floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility according to a preferred embodiment of the present invention;

[0027] Among them, 1-membrane, 2-flexible wave-breaking wall, 3-floating ring, 4-connecting piece, 5-mooring device, 6-upper flexible fixing ring, 7-lower fixing ring, 8-ellipsoidal supporting shell, 9-tensioning cable, 10-horizontal fixing ring. DETAILED DESCRIPTION

[0028] The following describes several preferred embodiments of the present invention with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0029] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0030] The overall structure of the mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility is as follows: Figure 1 As shown in FIG. 1 , the platform is composed of a membrane system, a floating ring system and a mooring system. The floating ring system and the mooring system are not innovative contents of the present invention, so they are not described in detail. At the same time, the photovoltaic panels on the upper part of the membrane system are not shown in FIG. Figure 1 As shown in the figure, the main innovation of this platform lies in the membrane system and its internal arch support structure.

[0031] The membrane system is a double-layer membrane structure, and a flexible wave-breaking wall 2 with a drainage port is surrounded on the outside. The membrane 1 and the flexible wave-breaking wall 2 are connected to the buoy 3 through a connector 4, and then moored to the seabed through a mooring device 5 connected to the buoy 3. The specific details are as follows Figure 2 shown.

[0032] In order to ensure that the membrane platform maintains the arch shape without losing its wave-following property, the present invention designs a double-layer membrane structure and an arch support structure, the horizontal schematic diagram of which is shown in FIG. Figure 3 As shown, the isometric diagram is as follows Figure 4 As shown, the longitudinal section is as follows Figure 5 As shown. The middle arch support structure is located inside the double-layer film, wherein the upper flexible fixing ring 6 is closely connected to the upper film, and the lower fixing ring 7 is closely connected to the lower film, and the two are used to fix the hollow and lightweight ellipsoidal support shell 8. In order to limit the horizontal displacement of the ellipsoidal support shell 8, the middle arch support structure is fixed by horizontally arranging a circle of vertical tensioning cables 9, the upper end of the tensioning cables 9 is connected to the upper flexible fixing ring 6, and the lower end is connected to the lower fixing ring 7. Normal pressure air is injected between the double-layer film, and the edge sealing is ensured.

[0033] In addition, in order to prevent the film 1 and the ellipsoidal support shell 8 from rotating relative displacement in the horizontal plane and causing the film to wear, a horizontal fixing ring 10 is set on the ellipsoidal support shell 8 to limit the horizontal relative rotation angular displacement. The size of the ellipsoidal support shell 8 (including the vertical height and horizontal width, that is, the major axis and minor axis of the elliptical cross section) should have a certain correlation with the diameter of the overall membrane floating platform to ensure that the slope of the upper membrane is about 5° to 10°, and the contact with the upper and lower membranes is large enough to avoid generating a local high pressure area. At the same time, the material of the upper membrane should be coated with a hydrophobic coating to further enhance the drainage capacity.

[0034] In addition, the upper and lower layers of the double-layer membrane should be set with different pre-tensions. The pre-tension of the upper membrane should be larger to ensure that the effective slope is maintained when water accumulates, thereby achieving the function of draining water to the edge. The pre-tension of the lower membrane should be smaller to maintain the wave-following property of the membrane platform.

[0035] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility, characterized in that: It includes a film system, which is a double-layer film structure. The double-layer film includes an upper film and a lower film. A middle arch support structure is provided inside the double-layer film. The middle arch support structure includes an ellipsoidal support shell, and the ellipsoidal support shell is fixed in the middle of the double-layer film.

2. A mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 1, characterized in that: The outer side of the membrane system is surrounded by a flexible wave-breaking wall with drainage openings.

3. A mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 2, characterized in that: It also includes a floating ring and a mooring device. The membrane system and the flexible wave-breaking wall are connected to the floating ring through a connecting piece, and the floating ring is moored to the seabed through the mooring device.

4. The mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 1, characterized in that: The middle arch support structure also includes an upper flexible fixing ring and a lower fixing ring, the upper flexible fixing ring is connected to the upper film, the lower fixing ring is connected to the lower film, and the ellipsoidal support shell is fixed by the upper flexible fixing ring and the lower fixing ring.

5. A mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 4, characterized in that: The middle arch support structure also has a circle of vertical tension cables horizontally arranged to limit the horizontal displacement of the ellipsoidal support shell, and the upper and lower ends of the tension cables are respectively connected to the upper flexible fixing ring and the lower fixing ring.

6. A mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 5, characterized in that: A horizontal fixing ring for limiting horizontal relative rotational angular displacement is also provided on the ellipsoidal supporting shell.

7. A mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 1, characterized in that: The edges of the double-layer films are sealed, and air at normal pressure is injected between the double-layer films.

8. The mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 1, characterized in that: The ellipsoidal supporting shell is a hollow structure.

9. The mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 1, characterized in that: The upper film is coated with a hydrophobic coating.

10. The mid-arch floating thin-film photovoltaic platform that avoids water accumulation and maintains flexibility as claimed in claim 1, characterized in that: The slope of the upper film is 5° to 10°, and the pre-tension of the upper film is greater than the pre-tension of the lower film.

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