Modularized offshore photovoltaic device and construction method thereof

Abstract

The modular offshore photovoltaic system comprises a photovoltaic module, the photovoltaic module comprises a plurality of photovoltaic module units, and the photovoltaic module is positioned in a construction sea area through positioning piles at the four corners of the edge; each photovoltaic module unit comprises a floating body platform, a photovoltaic net rack and an inverter box, connecting mechanisms are arranged among the floating body platforms in four directions and comprise male joints and female joints, the male joints and the female joints are oppositely arranged front and back and oppositely arranged left and right, and the male joints and the female joints are fixed through fixing pieces after being in butt joint. Different photovoltaic module units are connected through a connecting mechanism to form an integral floating platform of the photovoltaic module; according to the invention, the most difficult and most complex construction part of the offshore (mud flat) photovoltaic power station is transferred to the land factory for construction, the standardized and modularized construction is facilitated, then the modularized photovoltaic units are hauled to the offshore (mud flat) construction area and then are connected and fixed, the offshore construction process is simplified, and the construction difficulty of the offshore (mud flat) photovoltaic power station is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore photovoltaic power station construction, and in particular relates to a modular offshore photovoltaic power station and a construction method thereof. Background Art

[0002] ‌Due to the complex construction environment of offshore photovoltaic power stations, there are factors such as wind, waves, tides, and surges, which makes the technical difficulty and cost of offshore photovoltaic power station construction high. At present, both construction routes of offshore photovoltaics (fixed offshore photovoltaic construction plan and floating offshore photovoltaic construction plan) have the following four problems: First, the construction period is long; the existing offshore photovoltaic construction method requires a large number of offshore on-site operations, which is difficult to construct and easily affected by factors such as weather and sea conditions, resulting in an extended construction period. Second, the construction cost is high; the cost of offshore construction equipment is high, the cost of offshore construction personnel is high, and the offshore technology is difficult and the technical cost is high, resulting in high construction costs. Third, quality control is difficult; the operating environment of the offshore construction site is complex, and there are many quality control links, making it difficult to ensure the overall performance of the photovoltaic system. Fourth, the maintainability is poor; the photovoltaic grid of the fixed offshore photovoltaic power station is high above the water surface, and the lower part is a hollow water surface structure, which increases the difficulty of operation and maintenance; the floating offshore photovoltaic power station is also difficult to operate and maintain due to factors such as water transportation, working space, and offshore environment. Summary of the invention

[0003] The present invention provides a modular offshore photovoltaic system and a construction method thereof, which transfers the most difficult and complex construction part of the offshore (tidal flat) photovoltaic power station to a land factory for construction, facilitates standardized and modular construction, and then tows the modular photovoltaic units to the offshore (tidal flat) construction area for connection and fixation, thereby simplifying the offshore construction process and reducing the construction difficulty of the offshore (tidal flat) photovoltaic power station, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a modular offshore photovoltaic system, comprising a photovoltaic module, wherein the photovoltaic module comprises a plurality of photovoltaic module units, and the photovoltaic module is positioned in the construction sea area via positioning piles at the four corners of the edge; the photovoltaic module units each comprise a floating platform, a photovoltaic grid and an inverter box, and connecting mechanisms are arranged in four directions between the floating platforms, including a male connector and a female connector arranged oppositely in the front and rear, and a male connector and a female connector arranged oppositely in the left and right, and the male connector and the female connector are fixed by fixing parts after docking, and the different photovoltaic module units are connected by the connecting mechanism to form an integral floating platform of the photovoltaic module; the photovoltaic grid is installed on each corresponding floating platform through a supporting connecting mechanism, and the inverter box is fixed on the supporting connecting mechanism.

[0005] Preferably, the floating platform includes a main connecting beam of the floating platform, an intermediate connecting beam of the floating platform and a pontoon, the intermediate connecting beam of the floating platform is welded in the main connecting beam of the floating platform, the main connecting beam of the floating platform includes two parallel transverse connecting beams and two parallel longitudinal connecting beams, the pontoon is installed on the transverse connecting beam and the longitudinal connecting beam, the transverse connecting beam and the longitudinal connecting beam cross to form a square frame, and a fixing seat is welded at the intersection, the two ends of the transverse connecting beam are respectively provided with a transverse connecting male joint and a transverse connecting female joint, the two ends of the longitudinal connecting beam are respectively provided with a longitudinal connecting male joint and a longitudinal connecting female joint, the transverse connecting male joint and the longitudinal connecting male joint have the same structural dimensions, the transverse connecting female joint and the longitudinal connecting female joint have the same structural dimensions, the transverse connecting male joint and the longitudinal connecting male joint include a cylindrical joint, the cylindrical joint is provided with a transverse slot in the middle of the outer side, the transverse connecting female joint and the longitudinal connecting female joint are slot joints adapted to the slot, the cylindrical joint and the slot joint are provided with mounting holes that pass through from top to bottom, and are fixed by the fixing member.

[0006] Preferably, the slot connector includes a large semicircular portion and a small semicircular portion, the diameter of the large semicircular portion is larger than the diameter of the small semicircular portion, and both the large semicircular portion and the small semicircular portion have the center of the mounting hole as the center of the circle.

[0007] Preferably, the fixing member comprises a screw, and the mounting hole is a screw hole.

[0008] Preferably, a through hole is provided in the middle of the screw, and an adjusting column is installed. The bottom end of the adjusting column is provided with a round head close to the bottom end of the screw, and the diameter of the round head is smaller than the outer diameter of the screw. A positioning groove is provided on the outer side of the round head, and a first spring and a positioning column are installed in the positioning groove. The positioning column can completely enter the positioning groove after being pressed. A second positioning groove adapted to the positioning column is provided at the bottom end of the mounting hole of the cylindrical joint, and the lower part of the positioning column is exposed when it is located in the second positioning groove. The head end of the positioning column is a conical head structure, and an adjusting cap close to the head end of the screw is welded to the top end of the adjusting column.

[0009] Preferably, the photovoltaic grid includes a photovoltaic fixed grid, a solar photovoltaic panel and a grid connection fixing support, the grid connection fixing support is welded around the bottom end of the photovoltaic fixed grid, the grid connection fixing support includes a downward mounting groove, the supporting connection mechanism includes two front columns and two rear columns, the front columns are lower than the height of the rear columns, and the top ends of the front columns and the rear columns are inserted into the mounting groove.

[0010] Preferably, a third positioning groove is provided on one side of the top end of the front column and the rear column, a second spring and a second positioning column are installed in the third positioning groove, the head end of the second positioning column is a conical head structure, the grid connection and fixing support is provided with a fourth positioning groove adapted to the second positioning column, the second positioning column is partially stuck in the fourth positioning groove under the action of the second spring, and the grid connection and fixing support is provided with a small hole connected to the fourth positioning groove.

[0011] Preferably, the bottom ends of the front column and the rear column are both provided with threaded heads, the fixing seat is provided with corresponding screw grooves, and the front column and the rear column are threadedly connected in the screw grooves of the fixing seat via the threaded heads.

[0012] The present invention provides a modular offshore photovoltaic construction method, comprising the following steps: S1: Complete the assembly of photovoltaic module units by assembling the floating platform, photovoltaic grid and inverter box; S2: Assemble a sufficient number of modular offshore photovoltaic module units in the factory according to the predetermined scale; S3: transporting the photovoltaic module units to the coastal wharf, and towing the photovoltaic module units to the offshore construction area by a tugboat; S4: Connecting adjacent photovoltaic module units together through male connectors and female connectors, and fastening them through fasteners; S5: This cycle is repeated until all photovoltaic module units are connected; S6: Use fixed piles or anchoring methods to fix the photovoltaic modules in the predetermined construction area, make circuit connections, debug grid operations, and complete the construction of the photovoltaic power station.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a modular offshore photovoltaic system and its construction method, which transfers the most difficult and complex construction part of the offshore (tidal flat) photovoltaic power station to a land factory for construction, facilitates standardized and modular construction, and then tows the modular photovoltaic units to the offshore (tidal flat) construction area and connects and fixes them, thereby simplifying the offshore construction process and reducing the construction difficulty of the offshore (tidal flat) photovoltaic power station.

[0014] 2. By adopting a standardized and modular construction plan, the structural characteristics of the floating platform inside the photovoltaic module can be used to build a maintenance platform, which is convenient for operation, maintenance and inspection.

[0015] 3. The screws are locked while being tightened, which can ensure the overall connection stability of the photovoltaic system in the offshore construction site operation environment and complex use environment; and the modular and detachable photovoltaic modules facilitate the subsequent operation and maintenance.

[0016] 4. The floating platform and photovoltaic grid can be locked and positioned after convenient assembly, which can ensure the overall connection stability of the photovoltaic system in the offshore construction site working environment and complex use environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the photovoltaic module unit structure of the present invention; Figure 3 It is a schematic diagram of the floating platform structure of the present invention; Figure 4 It is a schematic diagram of the side view structure of the cylindrical joint of the present invention; Figure 5 It is a schematic diagram of the top view of the structure of the slot connector of the present invention; Figure 6 It is a schematic diagram of the screw structure of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the screw and the adjusting column of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of a cylindrical joint of the present invention; Fig. 9 It is a schematic diagram of the photovoltaic grid structure of the present invention; Fig.10 This is a schematic diagram of the structure of the grid connected to the fixed support, the front column and the rear column of the present invention; Fig.11 It is a schematic cross-sectional structure diagram of the grid connection fixed support, front column and rear column of the present invention; Fig.12 This is an enlarged structural diagram of the connection between the grid and the fixed support column of the present invention; Fig.13 It is a schematic diagram of the construction method of the present invention.

[0018] In the figure: 1. Photovoltaic module; 2. Photovoltaic module unit; 3. Positioning pile; 4. Construction sea area; 5. Floating platform; 6. Photovoltaic grid; 7. Inverter box; 8. Main connecting beam of floating platform; 9. Middle connecting beam of floating platform; 10. Floating box; 11. Fixed seat; 12. Transverse connecting male joint; 13. Transverse connecting female joint; 14. Longitudinal connecting male joint; 15. Longitudinal connecting female joint; 16. Cylinder joint; 17. Slot; 18. Slot joint; 19. Mounting hole; 20. Large semicircle; 21. Small semicircle; 22. Screw; 23. Adjustment column; 24. Round head; 25. First spring; 26. Positioning column; 27. Second positioning slot; 28. Adjustment cap; 29. ​​Photovoltaic fixed grid; 30. Solar photovoltaic panel; 31. Grid connection fixed support; 32. Front column; 33. Rear column; 34. Second spring; 35. Second positioning column; 36. Fourth positioning slot; 37. Threaded head. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-4 The present invention provides a modular offshore photovoltaic system, including a photovoltaic module 1, wherein the photovoltaic module 1 includes a plurality of photovoltaic module units 2, wherein the photovoltaic module 1 is positioned in a construction sea area 4 via positioning piles 3 at the four corners of the edge; the photovoltaic module units 2 each include a floating platform 5, a photovoltaic grid 6 and an inverter box 7, wherein the inverter box 7 is used for circuit connection and circuit system integration, and a connecting mechanism is arranged in four directions between the floating platforms 5, including a male connector and a female connector arranged oppositely in front and back, and a male connector and a female connector arranged oppositely in left and right, wherein the male connector and the female connector are fixed by a fixing member after being docked, and the photovoltaic module units 2 are connected by the connecting mechanism to form an integral floating platform of the photovoltaic module 1; the photovoltaic grid 6 is connected by a support The mechanism is installed on each corresponding floating platform 5, and the inverter box 7 is fixed on the supporting connection mechanism; the photovoltaic module unit is assembled by assembling the floating platform, the photovoltaic grid and the inverter box; a sufficient number of modular offshore photovoltaic module units are assembled in the factory according to the predetermined scale; the photovoltaic module units are transported to the coastal wharf, and the photovoltaic module units are towed to the offshore construction area by a tugboat; the adjacent photovoltaic module units are connected together by male and female connectors, and fastened by fasteners; this cycle is repeated to complete the connection of all photovoltaic module units; the photovoltaic modules are fixed in the predetermined construction area by using fixed piles or anchoring methods, and circuit connection and grid operation debugging are carried out to complete the construction of the photovoltaic power station.

[0021] like Figure 3-4 As shown, the floating platform 5 includes a floating platform main connecting beam 8, a floating platform intermediate connecting beam 9 and a pontoon 10, the floating platform intermediate connecting beam 9 is welded inside the floating platform main connecting beam 8, the floating platform main connecting beam 8 includes two parallel transverse connecting beams and two parallel longitudinal connecting beams, the pontoon 10 is installed on the transverse connecting beams and the longitudinal connecting beams, the transverse connecting beams and the longitudinal connecting beams cross to form a square frame, and a fixing seat 11 is welded at the intersection, the two ends of the transverse connecting beam are respectively provided with a transverse connecting male joint 12 and a transverse connecting female joint 13, the two ends of the longitudinal connecting beam are respectively provided with a longitudinal connecting male joint 14 and a longitudinal connecting female joint 15, the transverse connecting male joint 12 and the longitudinal connecting male joint 14 have the same structural dimensions, the transverse connecting female joint 13 and the longitudinal connecting female joint 15 have the same structural dimensions, the transverse connecting male joint 12 and the longitudinal connecting male joint 14 include A cylindrical joint 16, wherein the cylindrical joint 16 is provided with a transverse slot 17 in the middle of the outer side, the transverse connecting female joint 13 and the longitudinal connecting female joint 15 are slot joints 18 adapted to the slot 17, and the cylindrical joint 16 and the slot joint 18 are provided with mounting holes 19 that pass through from top to bottom and are fixed by the fixing member; in this embodiment, the floating platform main connecting beam 8, the floating platform middle connecting beam 9 and the floating box 10 can be directly assembled in the factory, and the transverse connecting male joint 12 and the transverse connecting female joints 13 of the left and right adjacent photovoltaic module units 2 can be horizontally connected, and the longitudinal connection male joint 14 and the front and rear adjacent longitudinal connecting female joints 15 can be longitudinally connected. During the specific connection, the slot joint 18 is directly stuck in the slot 17 in the cylindrical joint 16 to align the mounting holes 19, and then fasteners are installed in the mounting holes 19 to fix them, so as to realize the fast and stable connection of different photovoltaic module units 2.

[0022] like Figure 5 As shown, the slot joint 18 includes a large semicircular portion 20 and a small semicircular portion 21, the diameter of the large semicircular portion 20 is larger than the diameter of the small semicircular portion 21, and the large semicircular portion 20 and the small semicircular portion 21 both take the center of the mounting hole 19 as the center of the circle; in this embodiment, when the slot joint 18 is inserted into the slot 17 in the cylindrical joint 16, the slot joint 18 only has a displacement in a direction opposite to the insertion direction, thereby enhancing the stability of the connection after being fixed by fasteners.

[0023] like Figure 6 As shown, the fixing member includes a screw 22, and the mounting hole 19 is a screw hole; in this embodiment, fast fixing can be achieved by screwing the screw 22 into the mounting hole 19.

[0024] like Figure 6-8As shown, a through hole is provided in the middle of the screw 22, and an adjusting column 23 is installed. The bottom end of the adjusting column 23 is provided with a round head 24 close to the bottom end of the screw 22, and the diameter of the round head 24 is smaller than the outer diameter of the screw 22. A positioning groove is provided on the outer side of the round head 24, and a first spring 25 and a positioning column 26 are installed in the positioning groove. The positioning column 26 can completely enter the positioning groove after being pressed. A second positioning groove 27 adapted to the positioning column 26 is provided at the bottom end of the mounting hole 19 of the cylindrical joint 16, and the lower part of the positioning column 26 is exposed when the positioning column 26 is located in the second positioning groove 27. The head end of the positioning column 26 is a conical head structure, and an adjusting cap 28 close to the head end of the screw 22 is welded to the top end of the adjusting column 23. In this embodiment, when the slot joint 18 is inserted into the slot 17 in the cylindrical joint 16, press first The positioning column 26 on one side is used to make the positioning column 26 completely enter the positioning groove, and then the mounting screw 22 is screwed into the mounting hole 19. After being screwed into place, the positioning column 26 is screwed into the bottom end and is located at the same height as the second positioning groove 27. Then, the adjusting cap 28 is screwed to drive the round head 24 to rotate, and the angle of the positioning column 26 is adjusted to make it correspond to the second positioning groove 27. After alignment, the positioning column 26 is partially pushed into the second positioning groove 27 under the pressure of the first spring 25 to achieve locking. In the operating environment of the offshore construction site and the complex use environment, the overall connection stability performance of the photovoltaic system can be guaranteed; when the positioning column 26 is located in the second positioning groove 27, the lower part is exposed, which is convenient for later disassembly. The positioning column 26 can be pressed by an external component to make it completely return to the positioning groove, and then the screw 22 can be screwed to achieve disassembly. The modular and detachable photovoltaic module 1 is convenient for later operation and maintenance.

[0025] like Fig. 9 As shown, the photovoltaic grid 6 includes a photovoltaic fixed grid 29, a solar photovoltaic panel 30 and a grid connection fixing support 31, the grid connection fixing support 31 is welded around the bottom end of the photovoltaic fixed grid 29, the grid connection fixing support 31 includes a downward mounting groove, the supporting connection mechanism includes two front columns 32 at the front and two rear columns 33 at the rear, the front columns 32 are lower than the height of the rear columns 33, and the top ends of the front columns 32 and the rear columns 33 are inserted into the mounting grooves; in this embodiment, the photovoltaic grid 6 can be individually modularly disassembled, which further facilitates later operation and maintenance, and is also assembled in the factory.

[0026] like Figure 10-12As shown, the top side of the front column 32 and the rear column 33 are both provided with a third positioning groove, and the second spring 34 and the second positioning column 35 are installed in the third positioning groove. The head end of the second positioning column 35 is a conical head structure, and the grid frame connection and fixing support 31 is provided with a fourth positioning groove 36 adapted to the second positioning column 35. The second positioning column 35 is partially stuck in the fourth positioning groove 36 under the action of the second spring 34, and the grid frame connection and fixing support 31 is provided with a small hole connected to the fourth positioning groove 36. In this embodiment, the top ends of the front columns 32 and the rear columns 33 are connected to the grid frame connection and fixing support 31. When connecting, first press the second positioning column 35 and then insert it into the installation groove. After being inserted into place, the second positioning column 35 can be partially pushed into the fourth positioning groove 36 under the extrusion of the second spring 34 to realize the locking positioning after convenient assembly, so as to realize convenient assembly while ensuring the overall connection stability performance of the photovoltaic system in the operating environment of the offshore construction site and the complex use environment. The head end of the second positioning column 35 has a conical head structure, which is convenient for quick insertion into the fourth positioning groove 36 under inevitable errors; a small hole is provided, and when disassembly is required, an external component can be inserted through the small hole to push the second positioning column 35 back and then disassemble it, which further facilitates later operation and maintenance.

[0027] like Figure 10-12 As shown, the bottom ends of the front column 32 and the rear column 33 are both provided with a threaded head 37, and the fixing seat 11 is provided with a corresponding screw groove, and the front column 32 and the rear column 33 are threadedly connected in the screw groove of the fixing seat 11 through the threaded head 37; in this embodiment, the front column 32, the rear column 33 and the fixing seat 11 are conveniently installed through the threaded head 37, and after installation, the front column 32 and the rear column 33 can only be rotated to loosen, and the front column 32 and the rear column 33 are connected to the grid fixing support 31 through a locking mechanism and are locked and cannot rotate, so that the structure is very stable.

[0028] See also Fig.13 The present invention provides a modular offshore photovoltaic construction method, comprising the following steps: S1: Complete the prefabrication of the upper photovoltaic grid in the factory, including the installation of steel grids, photovoltaic panel fixation, etc., to ensure that the quality and performance of each module meet the design requirements, and complete the construction of the lower working floating platform in the factory, including the connection frame, connection float, support columns, standard connection components, maintenance platform (installed as needed), and module assembly. The upper and lower parts of the photovoltaic module are assembled according to the design drawings. During the assembly process, standardized interfaces are used to connect the modules to ensure the firmness and reliability of the connection. The assembly of the photovoltaic module unit is completed by assembling the floating platform, photovoltaic grid and inverter box; S2: Assemble a sufficient number of modular offshore photovoltaic module units in the factory according to the predetermined scale; S3: transporting the photovoltaic module units to the coastal wharf, and towing the photovoltaic module units to the offshore construction area by a tugboat; S4: Connecting adjacent photovoltaic module units together through male connectors and female connectors, and fastening them through fasteners; S5: This cycle is repeated until all photovoltaic module units are connected; S6: Use fixed piles or anchoring methods to fix the photovoltaic modules in the predetermined construction area, make circuit connections, debug grid operations, and complete the construction of the photovoltaic power station.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A modular offshore photovoltaic system, comprising a photovoltaic module (1), characterized in that: The photovoltaic module (1) comprises a plurality of photovoltaic module units (2), and the photovoltaic module (1) is positioned in a construction sea area (4) via positioning piles (3) at four corners of the edge; the photovoltaic module units (2) each comprise a floating platform (5), a photovoltaic grid (6) and an inverter box (7); connecting mechanisms are provided in four directions between the floating platforms (5), including male and female joints arranged opposite to each other in the front and rear, and male and female joints arranged opposite to each other in the left and right, and the male and female joints are fixed by a fixing member after being butted against each other, and the different photovoltaic module units (2) are connected by the connecting mechanism to form an integral floating platform of the photovoltaic module (1); the photovoltaic grid (6) is installed on each corresponding floating platform (5) via a supporting connecting mechanism, and the inverter box (7) is fixed on the supporting connecting mechanism.

2. A modular offshore photovoltaic system according to claim 1, characterized in that: The floating platform (5) comprises a floating platform main connection beam (8), a floating platform intermediate connection beam (9) and a pontoon (10), wherein the floating platform intermediate connection beam (9) is welded inside the floating platform main connection beam (8), the floating platform main connection beam (8) comprises two parallel transverse connection beams and two parallel longitudinal connection beams, the pontoon (10) is mounted on the transverse connection beam and the longitudinal connection beam, the transverse connection beam and the longitudinal connection beam intersect to form a square frame, and a fixing seat (11) is welded at the intersection, the two ends of the transverse connection beam are respectively provided with a transverse connection male joint (12) and a transverse connection female joint (13), and the two ends of the longitudinal connection beam are respectively provided with a longitudinal connection male joint (14) and a longitudinal connection female joint. The transverse connecting male joint (12) and the longitudinal connecting male joint (14) have the same structural dimensions, the transverse connecting female joint (13) and the longitudinal connecting female joint (15) have the same structural dimensions, the transverse connecting male joint (12) and the longitudinal connecting male joint (14) comprise a cylindrical joint (16), the cylindrical joint (16) is provided with a transverse groove (17) at the middle of the outer side, the transverse connecting female joint (13) and the longitudinal connecting female joint (15) are groove joints (18) adapted to the groove (17), the cylindrical joint (16) and the groove joint (18) are provided with mounting holes (19) which penetrate from top to bottom, and are fixed by the fixing member.

3. A modular offshore photovoltaic system according to claim 2, characterized in that: The slot connector (18) comprises a large semicircular portion (20) and a small semicircular portion (21); the diameter of the large semicircular portion (20) is larger than the diameter of the small semicircular portion (21); and the large semicircular portion (20) and the small semicircular portion (21) both have the center of the mounting hole (19) as their center.

4. A modular offshore photovoltaic system according to claim 2, characterized in that: The fixing member comprises a screw (22), and the mounting hole (19) is a screw hole.

5. A modular offshore photovoltaic system according to claim 4, characterized in that: A through hole is provided in the middle of the screw (22) and an adjusting column (23) is installed. A round head (24) is provided at the bottom end of the adjusting column (23) and is closely attached to the bottom end of the screw (22). The diameter of the round head (24) is smaller than the outer diameter of the screw (22). A positioning groove is provided on the outer side of the round head (24). A first spring (25) and a positioning column (26) are installed in the positioning groove. The positioning column (26) can completely enter the positioning groove after being pressed. A second positioning groove (27) adapted to the positioning column (26) is provided at the bottom end of the mounting hole (19) of the cylindrical joint (16). When the positioning column (26) is located in the second positioning groove (27), the lower part is exposed. The head end of the positioning column (26) is a conical head structure. An adjusting cap (28) close to the head end of the screw (22) is welded to the top end of the adjusting column (23).

6. The modular offshore photovoltaic system according to claim 2, characterized in that: The photovoltaic grid (6) comprises a photovoltaic fixed grid (29), a solar photovoltaic panel (30) and a grid connection fixing support (31), wherein the grid connection fixing support (31) is welded around the bottom end of the photovoltaic fixed grid (29), the grid connection fixing support (31) comprises a downwardly facing mounting groove, and the supporting connection mechanism comprises two front columns (32) at the front and two rear columns (33) at the rear, wherein the front columns (32) are lower than the height of the rear columns (33), and the top ends of the front columns (32) and the rear columns (33) are inserted into the mounting groove.

7. A modular offshore photovoltaic system according to claim 6, characterized in that: A third positioning groove is provided on one side of the top end of each of the front column (32) and the rear column (33), a second spring (34) and a second positioning column (35) are installed in the third positioning groove, the head end of the second positioning column (35) is a conical head structure, the grid connection fixing support (31) is provided with a fourth positioning groove (36) adapted to the second positioning column (35), the second positioning column (35) is partially stuck in the fourth positioning groove (36) under the action of the second spring (34), and the grid connection fixing support (31) is provided with a small hole connected to the fourth positioning groove (36).

8. The modular offshore photovoltaic system according to claim 6, characterized in that: The bottom ends of the front column (32) and the rear column (33) are both provided with a threaded head (37), and the fixing seat (11) is provided with a corresponding threaded groove, and the front column (32) and the rear column (33) are threadedly connected in the threaded groove of the fixing seat (11) via the threaded head (37).

9. A modular offshore photovoltaic construction method based on claim 8, characterized in that: The following steps are involved: S1: Complete the assembly of photovoltaic module units by assembling the floating platform, photovoltaic grid and inverter box; S2: Assemble a sufficient number of modular offshore photovoltaic module units in the factory according to the predetermined scale; S3: transporting the photovoltaic module units to the coastal wharf, and towing the photovoltaic module units to the offshore construction area by a tugboat; S4: Connecting adjacent photovoltaic module units together through male connectors and female connectors, and fastening them through fasteners; S5: This cycle is repeated until all photovoltaic module units are connected; S6: Use fixed piles or anchoring methods to fix the photovoltaic modules in the predetermined construction area, make circuit connections, debug grid operations, and complete the construction of the photovoltaic power station.

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