Connected floating island device of offshore floating type photovoltaic system and flow stabilizing and wave reducing construction method

Abstract

The invention discloses a conjoined floating island device of an offshore floating type photovoltaic system and a flow stabilizing and wave reducing construction method. The conjoined floating island device comprises a polygonal buoyancy ring, a floating island arranged in the center of the buoyancy ring, and a plurality of floaters evenly distributed around the floating island within the range of the buoyancy ring. The floating island and each floater, each floater and the buoyancy ring, and every two adjacent floaters are connected through prestressed cables to form a latticed floating structure; each grid of the floating structure is provided with a tension net, and a photovoltaic module is erected through the corresponding tension net. The steady-flow wave-reducing method is realized by using a connected floating island device for an offshore floating photovoltaic system, and comprises the following steps: 1, initial layout and preparation work; 2, arranging a prestressed cable and a tension net; 3, preliminary tensioning adjustment; 4, comprehensively tensioning and correcting; and 5, installing the photovoltaic panel. According to the invention, the floating photovoltaic power generation system is more efficient and stable in application in open water areas of the ocean.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation, and in particular to a connected floating island device of an offshore floating photovoltaic system and a flow stabilizing and wave cutting construction method. Background Art

[0002] As global climate change and environmental pollution become increasingly serious, the development and utilization of renewable energy has become an important part of the energy strategy of all countries. Under the policy background of "carbon peak and carbon neutrality", the development and utilization of solar energy as a clean and renewable energy has received unprecedented attention.

[0003] Offshore Floating Photovoltaic (OFPV) is a new type of photovoltaic power generation method that can use the surface of water bodies such as oceans, lakes and reservoirs to generate electricity by installing photovoltaic power generation systems on the water surface. This technology not only saves precious land resources, but also improves the power generation efficiency of photovoltaic modules due to the cooling effect of water bodies.

[0004] However, the development of offshore floating photovoltaics also faces a series of challenges. Due to the influence of complex environmental loads such as wind, waves, and currents, the water surface area where photovoltaic panels are arranged inside the annular or polygonal buoyancy ring may be frequently hit by waves, causing the photovoltaic panels to tilt or even damage.

[0005] In addition, wave reflection and resonance effects will also increase the disturbance of the internal water body, causing the fluctuation of the water surface to increase, increasing the stress load of the structure in the area, and thus shortening the service life of the system.

[0006] Moreover, the resonance effect may also lead to unstable power generation efficiency, especially in weather conditions with strong winds and waves, where this effect is particularly significant.

[0007] Therefore, how to improve the stability of the water flow inside the floating photovoltaic buoyancy ring, reduce water flow interference and resonance effects, and enhance the platform's wind, wave and current resistance, so as to make the application of floating photovoltaic power generation systems in open ocean waters more efficient and stable has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0008] In view of the above-mentioned defects of the prior art, the present invention provides a connected floating island device and a flow stabilization and wave cutting construction method for an offshore floating photovoltaic system. The purpose is to accelerate the attenuation of waves by arranging multiple connected floating islands at specific positions, improve the stability of the water flow inside the floating photovoltaic buoyancy ring, reduce water flow interference and resonance effects, and enhance the platform's wind resistance, wave resistance, and flow resistance, thereby making the application of floating photovoltaic power generation systems in open ocean waters more efficient and stable.

[0009] To achieve the above-mentioned purpose, the present invention discloses a connected floating island device of an offshore floating photovoltaic system, comprising a polygonal buoyancy ring, a floating island arranged at the center of the buoyancy ring, and a plurality of floats uniformly distributed around the floating island within the range of the buoyancy ring;

[0010] The floating island and each of the floaters, each of the floaters and the buoyancy ring, and every two adjacent floaters are connected by prestressed cables to form a grid-like floating structure;

[0011] Each grid of the floating structure is provided with a tension net, and photovoltaic modules are set up through the corresponding tension nets.

[0012] Preferably, the portion of the buoyancy ring corresponding to the straight side of the corresponding polygonal structure includes a plurality of standard segments connected end to end in sequence, and the portion corresponding to each corner is a connecting segment;

[0013] Each of the standard sections and each of the connecting sections comprises a concrete shell and a foam filler, and a plurality of buoyancy ring pre-embedded cable rings are provided along the length direction on the inner side facing the floating island;

[0014] The inner side of the buoyancy ring facing the floating island is connected to the corresponding tension net through the corresponding pre-buoyancy ring embedded cable ring.

[0015] More preferably, the multiple standard sections corresponding to the same straight side of the buoyancy ring are connected end to end in sequence through a plurality of prestressed tendons arranged on the corresponding concrete shell, and both ends of all the corresponding prestressed tendons are connected to the corresponding connecting section through a first anchoring end arranged on the corresponding connecting section.

[0016] More preferably, each of the prestressed cables connecting the floating island and each of the floats, and each of the prestressed cables connecting each of the floats and the buoyancy ring are arranged on the line connecting the floating island to the connecting section;

[0017] A second anchoring end is provided at a position where each connecting section is connected to the corresponding prestressed cable, and is connected to the corresponding prestressed cable through the corresponding second anchoring end.

[0018] Preferably, the floating island includes a floating island body;

[0019] The floating island body comprises a concrete shell and a foam filler, and each prestressed cable connecting the floating island and each of the floaters is provided with a floating island anchoring end on the outer side, and is connected to the corresponding prestressed cable through the corresponding floating island anchoring end, and a plurality of floating island pre-buried cable rings are provided corresponding to each adjacent tension net, and are connected to the corresponding tension net through the corresponding floating island pre-buried cable rings;

[0020] Each of the floats comprises a float body;

[0021] Each of the float bodies includes a concrete shell and a foam filler, and an outer surface is provided with a float anchoring end corresponding to each prestressed cable connecting the floating island and the corresponding float, each prestressed cable connecting the buoyancy ring and the corresponding float, and each prestressed cable connecting adjacent floats, which is connected to the corresponding prestressed cable through the corresponding float anchoring end, and a plurality of float pre-embedded cable rings are provided corresponding to each adjacent tension net, which are connected to the corresponding tension net through the corresponding float pre-embedded cable rings.

[0022] Preferably, each of the tension nets is formed by braided ropes made of polyester fibers resistant to seawater corrosion, and the mesh size meets the installation requirements of the photovoltaic panels;

[0023] Each of the tension nets is connected to the buoyancy ring, the floating island or the corresponding floater through an A-type node formed in an integrated bayonet and a corresponding pre-buried grommet of the buoyancy ring, a corresponding pre-buried grommet of the floating island or a corresponding pre-buried grommet of the float;

[0024] A plurality of connecting sleeves are provided at the edge positions where each tension net is connected to the corresponding prestressed cable, corresponding to the corresponding prestressed cable. The connection is achieved by passing the corresponding prestressed cable through the corresponding connecting sleeve to form a B-type connecting node.

[0025] Preferably, the prestressed cable is a cable with a stainless steel core coated with a high molecular polymer, and the photovoltaic assembly includes a photovoltaic panel and corresponding electrical equipment.

[0026] The present invention also provides a flow stabilization and wave cutting construction method for a conjoined floating island device of an offshore floating photovoltaic system, the steps of which are as follows:

[0027] Step 1: Initial layout and preparatory work, as follows:

[0028] Step 1.1, positioning the floating island and the floaters, making sure that the floating island is located at the center, so that all the floaters surround the floating island and are evenly distributed inside the buoyancy ring according to the designed positions;

[0029] Step 1.2, preparation of prestressed cables and tension nets, selecting prestressed cables of appropriate length and specification and tension nets of appropriate size according to design requirements;

[0030] Step 1.3, installation of tension equipment, installing tension adjustment devices at the floating island anchoring end of the floating island and the float anchoring end of the float, respectively, and ensuring the controllability of subsequent tensioning operations;

[0031] Step 2: Arrange the prestressed cables and the tension net, as follows:

[0032] Step 2.1, arranging the tension net, arranging the edges of the tension net along the directions of the radially arranged prestressed cables and the annularly arranged prestressed cables;

[0033] Step 2.2, arranging the prestressed cables, laying a first group of the prestressed cables connecting the floating island and each of the floats from the floating island to each of the floats, to form an initial radial connection;

[0034] Then, a third group of prestressed cables connecting the buoyancy ring and the corresponding buoy is laid from each buoy to the outer buoyancy ring;

[0035] Finally, a third group of prestressed cables connecting every two adjacent floats are arranged between adjacent floats to form a grid-like floating structure;

[0036] During the arrangement of the prestressed cables, they should be passed through the connecting sleeves of the corresponding tension nets in sequence;

[0037] Step 2.3, connecting the tension net, the floating island and the float, using the integrated bayonet on the tension net to connect with the buoyancy ring, the floating island or the corresponding buoyancy ring pre-embedded grommet on the corresponding floating island or the corresponding float pre-embedded grommet;

[0038] Step 3: Initial tension adjustment, as follows:

[0039] Step 3.1, gradually applying prestress, using the tension device to gradually apply tension to each of the prestressed cables to ensure that the rigging is not loose;

[0040] Step 3.2, symmetrically adjusting the prestress of the prestressed cables, and adjusting the tension of all the prestressed cables in a symmetrical order centered on the floating island;

[0041] Step 3.3, adjusting the slackness of the tension net, using the tension adjustment device of the prestressed cable to adjust the tightness of the tension net so that it forms a flat support surface to a degree capable of bearing the weight of the photovoltaic panel;

[0042] Step 4: Comprehensive tensioning and calibration, as follows:

[0043] Step 4.1, synchronously applying the design tension, according to the design requirements, gradually raising each of the prestressed cables to the design tension value through the tension equipment;

[0044] Step 4.2, dynamic calibration, check whether the floating island maintains the central position and whether each of the floats is evenly distributed;

[0045] If it is found that the displacement of any of the floats exceeds a threshold value, correction is performed by fine-tuning the tension of the corresponding prestressed cable;

[0046] Step 4.3, loading test, simulating the application of the weight of the photovoltaic panel to perform a loading test to confirm the bearing capacity and stability of the tension net;

[0047] Step 5: Install the photovoltaic panels, as follows:

[0048] Step 5.1, placement of the photovoltaic panels, uniformly placing all the photovoltaic panels along the radial or annular layout of the corresponding tension net, the bottom of the photovoltaic panel is connected to the corresponding tension net through a flexible clamp to ensure stable fixation and easy disassembly;

[0049] Step 5.2: Check the photovoltaic panels to confirm whether the installation angle and spacing of the photovoltaic panels meet the design requirements to avoid mutual shading that affects power generation efficiency;

[0050] Step 5.3: Check the stress status of all the tension nets to ensure that they remain in a tensioned state after the corresponding photovoltaic panels are installed.

[0051] Preferably, in step 1.3, the tension adjusting device is a tensioner or a hydraulic cable device.

[0052] Preferably, after all the photovoltaic panels are installed, a full system inspection is performed, specifically: checking whether the overall layout of the floating island, all the floats, all the prestressed cables, all the tension nets and all the photovoltaic panels meets the design standards, and finally performing a dynamic environmental test including wave and wind simulation to verify the overall impact resistance.

[0053] Beneficial effects of the present invention:

[0054] The present invention arranges multiple connected floating islands at specific locations to accelerate wave attenuation, improve the stability of water flow inside the floating photovoltaic buoyancy ring, reduce water flow interference and resonance effects, and enhance the platform's wind, wave and current resistance, thereby making the application of floating photovoltaic power generation systems in open ocean waters more efficient and stable.

[0055] 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

[0056] Figure 1 A schematic structural diagram of an embodiment of the present invention is shown.

[0057] Figure 2 Showing the present invention Figure 1 A partial enlarged schematic diagram of the explosion structure at point A in the middle.

[0058] Figure 3 Showing the present invention Figure 2 Schematic diagram of the local enlarged structure at point B in the middle.

[0059] Figure 4 Showing the present invention Figure 1 Schematic diagram of the partial enlarged structure at point C in the middle.

[0060] Figure 5 Showing the present invention Figure 4 Schematic diagram of the local enlarged structure at point D in the middle.

[0061] Figure 6 A schematic structural diagram of a floating island in one embodiment of the present invention is shown.

[0062] Figure 7 Showing the present invention Figure 1 Schematic diagram of the local enlarged structure at point E in the middle.

[0063] Figure 8 Showing the present invention Figure 7 Schematic diagram of the partially enlarged structure at point F in the middle.

[0064] Fig. 9 A schematic structural diagram of a float in one embodiment of the present invention is shown.

[0065] Fig.10 A partially enlarged schematic diagram of the connection structure of the tension net in one embodiment of the present invention is shown.

[0066] Fig.11 Showing the present invention Fig.10 Schematic diagram of the local enlarged structure at G in the middle.

[0067] Fig.12 Showing the present invention Fig.10 Schematic diagram of the local enlarged structure at H in the middle.

[0068] Fig.13 Showing the present invention Fig.12 Schematic diagram of the local enlarged structure at point I in the middle. DETAILED DESCRIPTION

[0069] Example

[0070] like Figures 1 to 9 As shown, the combined floating island device of the offshore floating photovoltaic system includes a polygonal buoyancy ring 10, a floating island 20 arranged at the center of the buoyancy ring 10, and a plurality of floats 30 uniformly distributed around the floating island 20 within the range of the buoyancy ring 10;

[0071] The floating island 20 and each buoy 30, each buoy 30 and the buoyancy ring 10, and each two adjacent buoys 30 are connected by prestressed cables 50 to form a grid-like floating structure.

[0072] Each grid of the floating structure is provided with a tension net 40 , and the photovoltaic assembly 60 is erected through the corresponding tension net 40 .

[0073] The present invention effectively attenuates waves and improves the water flow stability of the floating photovoltaic system in the buoyancy ring 10 through the damping effect of the floating island 20 and the multiple floats 30, while using the prestressed cables 50 to fix and stabilize the floating island 20 and the multiple floats 30, and transfer wave energy to reduce the impact of waves on the structure.

[0074] In addition, the presence of the floating island 20 can also adjust the wave mode and resonance frequency within the buoyancy ring 10, reducing the resonance effect caused by long-period waves. Especially under severe weather conditions, this design can significantly reduce the accumulation and amplification of waves within the buoyancy ring, thereby improving the stability and safety of the entire system.

[0075] The combined effect of the above-mentioned technical means enables the invention to have significant technological progress and application value in the field of offshore floating photovoltaic power generation.

[0076] In some embodiments, the portion of the buoyancy ring 10 corresponding to the straight side of the corresponding polygonal structure includes a plurality of standard segments 102 connected end to end in sequence, and the portion corresponding to each corner is a connecting segment 101;

[0077] Each standard section 102 and each connecting section 101 includes a concrete shell and a foam filler, and the inner side facing the floating island 20 is provided with a plurality of buoyancy rings 105 embedded in the length direction;

[0078] The inner side of the buoyancy ring 10 facing the floating island 20 is connected to the corresponding tension net 40 through the corresponding buoyancy ring pre-embedded grommet 105.

[0079] In some embodiments, multiple standard sections 102 corresponding to the same straight side of the buoyancy ring 10 are connected end to end in sequence through multiple prestressed tendons 103 arranged on the corresponding concrete shell, and both ends of all corresponding prestressed tendons 103 are connected to the corresponding connecting section 101 through the first anchoring end 104 arranged on the corresponding connecting section 101.

[0080] In some embodiments, each prestressed cable 50 connecting the floating island 20 and each buoy 30, and each prestressed cable 50 connecting each buoy 30 and the buoyancy ring 10 are arranged on the line connecting the floating island 20 to the connecting section 101;

[0081] A second anchoring end 111 is provided at a position where each connecting section 101 is connected to a corresponding prestressed cable 50 , and is connected to the corresponding prestressed cable 50 via the corresponding second anchoring end 111 .

[0082] In practical applications, the present invention achieves the stability of the overall structure through the above technical means.

[0083] In certain embodiments, the floating island 20 includes a floating island body 201;

[0084] The floating island body 201 includes a concrete shell and a foam filler, and a floating island anchoring end 202 is provided on the outer side corresponding to each prestressed cable 50 connecting the floating island 20 and each buoy 30, and is connected to the corresponding prestressed cable 50 through the corresponding floating island anchoring end 202, and a plurality of floating island pre-buried cable rings 203 are provided corresponding to each adjacent tension net 40, and are connected to the corresponding tension net 40 through the corresponding floating island pre-buried cable rings 203;

[0085] Each float 30 includes a float body 301;

[0086] Each float body 301 includes a concrete shell and a foam filler, and a float anchoring end 302 is provided on the outer side corresponding to each prestressed cable 50 connecting the floating island 20 and the corresponding float 30, each prestressed cable 50 connecting the buoyancy ring 10 and the corresponding float 30, and each prestressed cable 50 connecting adjacent floats 30, and is connected to the corresponding prestressed cable 50 through the corresponding float anchoring end 302, and a plurality of float pre-embedded cable rings 303 are provided corresponding to each adjacent tension net 40, and are connected to the corresponding tension net 40 through the corresponding float pre-embedded cable rings 303.

[0087] In actual application, the buoyancy ring 10 is in the shape of a regular hexagon. The floating island body 201 is made of a concrete shell and a foam filler and is cylindrical in design. Six floating island anchoring ends 202 are evenly distributed along the circumference. Each floating island anchoring end 202 is preset with a standardized connector for fixing the radial prestressed cable 50. In addition, a plurality of evenly distributed floating island pre-embedded cable rings 203 are provided between the floating island anchoring ends 202 for connecting the tension net 40.

[0088] In actual application, the float body 301 is composed of a concrete shell and a foam filler, and is cylindrical in design. Four float anchoring ends 302 are distributed along the circumference, and each float anchoring end 302 is preset with a standardized connector for fixing the radial prestressed cable 50. A plurality of evenly distributed float pre-embedded cable rings 303 are provided between the float anchoring ends 302 to connect the tension net 40. A total of 6 floats are evenly distributed between the floating island 20 and the buoyancy ring 10.

[0089] In some embodiments, each tension net 40 is formed by a braided rope 401 made of polyester fibers resistant to seawater corrosion, and the mesh size meets the installation requirements of the photovoltaic panel;

[0090] Each tension net 40 is connected to the buoyancy ring 10, the floating island 20 or the corresponding float 30 through an A-type node formed in the integrated bayonet and the corresponding buoyancy ring pre-buried grommet 105, the corresponding floating island pre-buried grommet 203 or the corresponding float pre-buried grommet 303;

[0091] A plurality of connecting sleeves 402 are provided at the edge positions where each tension net 40 is connected to the corresponding prestressed cable 50 , corresponding to the corresponding prestressed cable 50 . The connection is achieved by passing the corresponding prestressed cable 50 through the corresponding connecting sleeves 402 to form a B-type connecting node.

[0092] In practical applications, the tension net 40 provided by the present invention includes two parts: a braided rope 401 and a connecting sleeve 402 .

[0093] The braided rope 401 is woven from polyester fibers that are resistant to seawater corrosion, and the mesh size is generally designed to be 50×50 cm to meet the requirements of photovoltaic panel installation.

[0094] The TensionNet 40 is connected to other components of the photovoltaic platform through two types of nodes:

[0095] The A-type node is used to connect the tension net 40 with the floating island 20, the float 30 and the buoyancy ring 10;

[0096] The B-type node is used to connect the tension net 40 with the prestressed cable 50. The prestressed cable 50 passes through the connecting sleeve 402 to ensure the stability of the tension net structure.

[0097] In some embodiments, the prestressed cable 50 is a cable having a stainless steel core coated with a high molecular polymer, and the photovoltaic assembly 60 includes a photovoltaic panel and corresponding electrical equipment.

[0098] In practical applications, the prestressed cable 50 is a cable with a stainless steel core coated with a high molecular polymer, which has both high strength and resistance to corrosion in the marine environment.

[0099] In practical applications, the prestressed cables 50 are usually divided into three groups.

[0100] The first set of radial prestressed cables 50 connects the floating island 20 and each buoy 30;

[0101] The second group of annular prestressed cables 50 connects every two adjacent floats 30;

[0102] The third group of radial prestressed cables 50 connects the buoyancy ring 10 and the corresponding floats 30 .

[0103] The photovoltaic assembly 60 includes photovoltaic panels and corresponding electrical equipment, which can be arranged according to power generation needs.

[0104] The present invention also provides a flow stabilization and wave cutting construction method for a conjoined floating island device of an offshore floating photovoltaic system, the steps of which are as follows:

[0105] Step 1: Initial layout and preparatory work, as follows:

[0106] Step 1.1, positioning the floating island 20 and the floaters 30, making sure that the floating island 20 is located at the center, so that all the floaters 30 surround the floating island 20 and are evenly distributed inside the buoyancy ring 10 according to the designed position;

[0107] Step 1.2, preparation of prestressed cables 50 and tension nets 40, selecting prestressed cables 50 of appropriate length and specifications and tension nets 40 of appropriate size according to design requirements;

[0108] Step 1.3, installation of tension equipment: installing tension adjustment devices at the floating island anchoring end 202 of the floating island 20 and the floating anchoring end 302 of the float 30, respectively, and ensuring the controllability of subsequent tensioning operations;

[0109] Step 2: Arrange the prestressed cables 50 and the tension net 40, as follows:

[0110] Step 2.1, arranging the tension net 40, arranging the edges of the tension net 40 along the radially arranged prestressed cables 50 and the annularly arranged prestressed cables 50;

[0111] In actual applications, when arranging the tension net 40, arranging the edges of the tension net 40 along the radially arranged prestressed cables 50 and the annularly arranged prestressed cables 50 can facilitate the prestressed cables 50 to pass through the buckles woven integrally with the tension net 40 more quickly when arranging.

[0112] Step 2.2, arranging prestressed cables 50, laying a first group of prestressed cables 50 connecting the floating island 20 and each buoy 30 from the floating island 20 to each buoy 30, forming an initial radial connection;

[0113] Then, a third set of prestressed cables 50 connecting the buoyancy ring 10 and the corresponding buoy 30 is laid from each buoy 30 to the outer buoyancy ring 10;

[0114] Finally, a third group of prestressed cables 50 connecting every two adjacent floats 30 is arranged between adjacent floats 30 to form a grid-like floating structure;

[0115] During the arrangement of the prestressed cables 50, they should be sequentially passed through the connecting sleeves 402 of the corresponding tension nets 40;

[0116] Step 2.3, connecting the tension net 40, the floating island 20 and the float 30, using the integrated bayonet on the tension net 40 to connect with the corresponding buoyancy ring pre-buried grommet 105, the corresponding floating island pre-buried grommet 203 or the corresponding float pre-buried grommet 303 on the buoyancy ring 10, the floating island 20 or the corresponding float 30;

[0117] Step 3: Initial tension adjustment, as follows:

[0118] Step 3.1, gradually apply prestress, use a tension device to gradually apply tension on each prestressed cable 50 to ensure that the rigging is not loose;

[0119] Step 3.2, symmetrically adjusting the prestress of the prestressed cables 50, and adjusting the tension of all the prestressed cables 50 in a symmetrical order centered on the floating island 20;

[0120] In practical applications, for example, the prestressed cables 50 along the north-south direction may be tensioned synchronously, and then other prestressed cables 50 in the east-west direction and the diagonal direction may be adjusted to ensure overall balance.

[0121] Step 3.3, adjusting the slackness of the tension net 40, using the tension adjustment device of the prestressed cable 50, to adjust the tightness of the tension net 40 so that it forms a flat support surface to a degree capable of bearing the weight of the photovoltaic panel;

[0122] Step 4: Comprehensive tensioning and calibration, as follows:

[0123] Step 4.1, synchronously apply the design tension, and gradually increase each prestressed cable 50 to the design tension value through the tension equipment according to the design requirements;

[0124] Step 4.2: Dynamic calibration, check whether the floating island 20 maintains the center position and whether each float 30 is evenly distributed;

[0125] If it is found that the deviation of any float 30 exceeds the threshold value, correction is performed by fine-tuning the tension of the corresponding prestressed cable 50;

[0126] Step 4.3, loading test, simulating the weight of the photovoltaic panel to perform a loading test to confirm the bearing capacity and stability of the tension net 40;

[0127] Step 5: Install the photovoltaic panels, as follows:

[0128] Step 5.1, placement of photovoltaic panels, all photovoltaic panels are evenly placed along the radial or annular layout of the corresponding tension net 40, and the bottom of the photovoltaic panel is connected to the corresponding tension net 40 through a flexible clamp to ensure that it is firmly fixed and easy to disassemble;

[0129] Step 5.2: Check the photovoltaic panels to confirm whether the installation angle and spacing of the photovoltaic panels meet the design requirements to avoid mutual shading that affects power generation efficiency;

[0130] Step 5.3: Check the stress state of all tension nets 40 to ensure that they remain in a tensioned state after the corresponding photovoltaic panels are installed.

[0131] In some embodiments, in step 1.3, the tension adjustment device is a tensioner or a hydraulic cable device.

[0132] In some embodiments, after all photovoltaic panels are installed, a full system inspection is performed, specifically: checking whether the overall layout of the floating island 20, all floats 30, all prestressed cables 50, all tension nets 40 and all photovoltaic panels meets the design standards, and finally performing a dynamic environmental test including wave and wind simulation to verify the overall impact resistance.

[0133] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A conjoined floating island device for an offshore floating photovoltaic system; characterized in that: It comprises a polygonal buoyancy ring (10), a floating island (20) arranged at the center of the buoyancy ring (10), and a plurality of floats (30) evenly distributed around the floating island (20) within the range of the buoyancy ring (10); The floating island (20) and each of the floaters (30), each of the floaters (30) and the buoyancy ring (10), and each two adjacent floaters (30) are connected by prestressed cables (50) to form a grid-like floating structure; Each grid of the floating structure is provided with a tension net (40), and a photovoltaic assembly (60) is erected through the corresponding tension net (40).

2. The conjoined floating island device of the offshore floating photovoltaic system according to claim 1 is characterized in that: The portion of the buoyancy ring (10) corresponding to the straight side of the corresponding polygonal structure comprises a plurality of standard segments (102) connected end to end in sequence, and the portion corresponding to each corner is a connecting segment (101); Each of the standard sections (102) and each of the connecting sections (101) comprises a concrete shell and a foam filler, and a plurality of buoyancy ring pre-embedded grommet (105) are provided along the length direction on the inner side facing the floating island (20); The inner side surface of the buoyancy ring (10) facing the floating island (20) is connected to the corresponding tension net (40) through the corresponding buoyancy ring pre-buried grommet (105).

3. The conjoined floating island device of the offshore floating photovoltaic system according to claim 2 is characterized in that: The plurality of standard sections (102) corresponding to the same straight side of the buoyancy ring (10) are connected end to end in sequence via a plurality of prestressed tendons (103) arranged on the corresponding concrete shell, and both ends of all the corresponding prestressed tendons (103) are connected to the corresponding connecting section (101) via a first anchoring end (104) arranged on the corresponding connecting section (101).

4. The conjoined floating island device of the offshore floating photovoltaic system according to claim 3 is characterized in that: Each of the prestressed cables (50) connecting the floating island (20) and each of the floaters (30), and each of the prestressed cables (50) connecting each of the floaters (30) and the buoyancy ring (10) are arranged on a line connecting the floating island (20) to the connecting section (101); A second anchoring end (111) is provided at a position where each connecting section (101) is connected to the corresponding prestressed cable (50), and is connected to the corresponding prestressed cable (50) via the corresponding second anchoring end (111).

5. The conjoined floating island device of the offshore floating photovoltaic system according to claim 1, characterized in that: The floating island (20) comprises a floating island body (201); The floating island body (201) comprises a concrete shell and a foam filler, and each prestressed cable (50) corresponding to the outer surface connecting the floating island (20) and each buoy (30) is provided with a floating island anchoring end (202), and is connected to the corresponding prestressed cable (50) through the corresponding floating island anchoring end (202), and each adjacent tension net (40) is provided with a plurality of floating island pre-buried cable rings (203), and is connected to the corresponding tension net (40) through the corresponding floating island pre-buried cable rings (203); Each of the floats (30) comprises a float body (301); Each of the float bodies (301) comprises a concrete shell and a foam filler, and an outer surface thereof is provided with a float anchoring end (302) corresponding to each prestressed cable (50) connecting the floating island (20) and the corresponding float (30), each prestressed cable (50) connecting the buoyancy ring (10) and the corresponding float (30), and each prestressed cable (50) connecting adjacent floats (30), and is connected to the corresponding prestressed cable (50) through the corresponding float anchoring end (302); and a plurality of float pre-buried cable rings (303) are provided corresponding to each adjacent tension net (40), and are connected to the corresponding tension net (40) through the corresponding float pre-buried cable rings (303).

6. The conjoined floating island device of the offshore floating photovoltaic system according to claim 1, characterized in that: Each of the tension nets (40) is formed by a braided rope (401) made of polyester fibers resistant to seawater corrosion, and the mesh size meets the installation requirements of the photovoltaic panel; Each of the tension nets (40) is connected to the buoyancy ring (10), the floating island (20) or the corresponding float (30) by connecting an integrated bayonet with an A-type node formed in the corresponding buoyancy ring pre-buried grommet (105), the corresponding floating island pre-buried grommet (203) or the corresponding float pre-buried grommet (303); A plurality of connection sleeves (402) are provided at the edge positions where each tension net (40) is connected to the corresponding prestressed cable (50), corresponding to the corresponding prestressed cable (50), and the connection is achieved by passing the corresponding prestressed cable (50) through the corresponding connection sleeves (402) to form a B-type connection node.

7. The conjoined floating island device for an offshore floating photovoltaic system according to claim 1, characterized in that: The prestressed cable (50) is a cable with a stainless steel core coated with a high molecular polymer, and the photovoltaic assembly (60) comprises a photovoltaic panel and corresponding electrical equipment.

8. The method for stabilizing flow and cutting waves of a connected floating island device of an offshore floating photovoltaic system according to claim 1, characterized in that: The steps include: Step 1: Initial layout and preparatory work, as follows: Step 1.1, positioning the floating island (20) and the floaters (30), ensuring that the floating island (20) is located at the center, and making all the floaters (30) surround the floating island (20) and be evenly distributed inside the buoyancy ring (10) according to the designed positions; Step 1.2, preparing the prestressed cables (50) and the tension net (40), selecting the prestressed cables (50) of suitable length and specification and the tension net (40) of suitable size according to the design requirements; Step 1.3, installation of tension equipment, installing tension adjustment devices at the floating island anchoring end (202) of the floating island (20) and the float anchoring end (302) of the float (30), respectively, and ensuring the controllability of subsequent tensioning operations; Step 2: Arranging the prestressed cables (50) and the tension net (40), specifically as follows: Step 2.1, arranging the tension net (40), arranging the edges of the tension net (40) along the directions of the prestressed cables (50) arranged radially and the prestressed cables (50) arranged in an annular shape; Step 2.2, arranging the prestressed cables (50), laying a first group of the prestressed cables (50) connecting the floating island (20) and each of the floats (30) from the floating island (20) to each of the floats (30), to form an initial radial connection; Then, a third group of prestressed cables (50) connecting the buoyancy ring (10) and the corresponding buoy (30) are laid from each buoy (30) to the outer buoyancy ring (10); Finally, a third group of prestressed cables (50) connecting every two adjacent floats (30) is arranged between adjacent floats (30) to form a grid-like floating structure; During the arrangement of the prestressed cables (50), they should be sequentially passed through the connection sleeves (402) of the corresponding tension nets (40); Step 2.3, connecting the tension net (40), the floating island (20) and the float (30), using the integrated bayonet on the tension net (40) to connect with the corresponding buoyancy ring pre-buried grommet (105) on the buoyancy ring (10), the floating island (20) or the corresponding float (30), the corresponding floating island pre-buried grommet (203) or the corresponding float pre-buried grommet (303); Step 3: Initial tension adjustment, as follows: Step 3.1, gradually applying prestress, using the tension device to gradually apply tension to each of the prestressed cables (50) to ensure that the rigging is not loose; Step 3.2, symmetrically adjusting the prestress of the prestressed cables (50), and adjusting the tension of all the prestressed cables (50) in a symmetrical order centered on the floating island (20); Step 3.3, adjusting the slackness of the tension net (40), and using the tension adjustment device of the prestressed cable (50) to adjust the tightness of the tension net (40) so that it forms a flat support surface to a degree capable of bearing the weight of the photovoltaic panel; Step 4: Comprehensive tensioning and calibration, as follows: Step 4.1, synchronously applying the design tension, and gradually raising each of the prestressed cables (50) to the design tension value through the tension equipment according to the design requirements; Step 4.2, dynamic calibration, checking whether the floating island (20) maintains the central position and whether each of the floats (30) is evenly distributed; If it is found that the displacement of any of the floats (30) exceeds a threshold value, correction is performed by fine-tuning the tension of the corresponding prestressed cable (50); Step 4.3, loading test, simulating the application of the weight of the photovoltaic panel to perform a loading test to confirm the bearing capacity and stability of the tension net (40); Step 5: Install the photovoltaic panels, as follows: Step 5.1, placing the photovoltaic panels, placing all the photovoltaic panels evenly along the radial or annular layout of the corresponding tension net (40), and connecting the bottom of the photovoltaic panel to the corresponding tension net (40) through a flexible clamp to ensure that it is firmly fixed and easy to disassemble; Step 5.2: Check the photovoltaic panels to confirm whether the installation angle and spacing of the photovoltaic panels meet the design requirements to avoid mutual shading that affects power generation efficiency; Step 5.3, check the stress state of all the tension nets (40) to ensure that they remain in a tensioned state after the corresponding photovoltaic panels are installed.

9. The method for stabilizing flow and cutting waves of a connected floating island device of an offshore floating photovoltaic system according to claim 8, characterized in that: In step 1.3, the tension adjusting device is a tensioner or a hydraulic cable device.

10. The method for stabilizing current and cutting waves of a connected floating island device of an offshore floating photovoltaic system according to claim 8, characterized in that: After all the photovoltaic panels are installed, a full system inspection is performed, specifically: checking whether the overall layout of the floating island (20), all the floats (30), all the prestressed cables (50), all the tension nets (40) and all the photovoltaic panels meets the design standards, and finally a dynamic environmental test including wave and wind simulation is performed to verify the overall impact resistance.

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