Floating type offshore photovoltaic system convenient to maintain and control method thereof

Abstract

The invention provides a floating type offshore photovoltaic system convenient to maintain and a control method thereof, the photovoltaic system comprises an annular floating body and a photovoltaic part arranged on the annular floating body, and the annular floating body is provided with a traction assembly; the photovoltaic part comprises a photovoltaic mounting unit and a photovoltaic panel assembly arranged on the photovoltaic mounting unit, and the photovoltaic mounting unit can form a plurality of elastic mounting positions in the annular floating body; the photovoltaic panel assemblies are arranged at the plurality of elastic mounting positions; a rotating unit is arranged below the photovoltaic part in the annular floating body, a maintenance part is arranged on the rotating unit, and the rotating unit and the maintenance part are provided with control units. According to the photovoltaic panel operation and maintenance device, flexible rotation and radial movement of the photovoltaic panel operation and maintenance device are achieved, operation and maintenance personnel can reach the position of a photovoltaic panel needing to be maintained to carry out operation and maintenance, the maintenance work of the photovoltaic panel is simplified, the maintenance efficiency and safety are improved, the elastic tension cables are adopted to provide stable support for the photovoltaic panel, the installation cost is reduced, and the installation efficiency is improved. And the overall stability of the photovoltaic system is enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore photovoltaic systems, and in particular relates to a floating offshore photovoltaic system that is easy to maintain and a control method thereof. Background Art

[0002] At present, compared with photovoltaic projects on land, offshore photovoltaic projects have the advantages of not occupying land, high power generation efficiency, and high environmental protection. Based on this, at present, offshore photovoltaic projects generally use floating offshore photovoltaics or piled offshore photovoltaics. When the water depth is deep, the water level changes greatly, and the geology of the bottom of the water is unstable, the installation cost and construction cost of piled offshore photovoltaics will be relatively high and not stable enough. It is easily affected by the depth of the water.

[0003] Therefore, in the face of scenes with deep waters, it is better to choose a fixed offshore photovoltaic structure with better cost control and stability. Based on floating offshore photovoltaics, photovoltaic resources in deep waters can be developed. However, the current floating offshore photovoltaic structure design adopts a floating method, so it is necessary to fix the photovoltaic panels on floating objects or fixed brackets, and then use some traction ropes as traction to control. Due to the instability of the sea level, the cost of this photovoltaic panel installation method is high and the stability of the photovoltaic panels cannot be guaranteed, which may affect the photovoltaic efficiency and the stability of the overall photovoltaic structure. Moreover, if one or several photovoltaic panels need maintenance and repair, the operator needs to use himself or other equipment to go to the specific area to be maintained, and then perform the corresponding operation, and the convenience of maintenance operations needs to be improved. Therefore, in summary, in the current floating offshore photovoltaic structure, the stability of photovoltaic panels needs to be improved, and if individual photovoltaic panels are damaged and need to be repaired or replaced, it is inconvenient for operators to perform operation and maintenance operations. Summary of the invention

[0004] The present invention provides a floating offshore photovoltaic system that is easy to maintain and a control method thereof, aiming to solve the problem that in the current floating offshore photovoltaic structure, the stability of photovoltaic panel installation needs to be improved, and if individual photovoltaic panels need to be repaired or replaced, it is inconvenient for operators to perform operation and maintenance operations.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] The present invention discloses a floating offshore photovoltaic system that is easy to maintain. The photovoltaic system comprises an annular floating body and a photovoltaic part arranged on the annular floating body. The annular floating body has a traction assembly. When the annular floating body floats on a working liquid surface, the photovoltaic part can be located above the working liquid surface. The traction assembly can make the annular floating body located in a working area.

[0007] The photovoltaic part includes a photovoltaic installation unit and a photovoltaic panel assembly arranged thereon, wherein the photovoltaic installation unit can form a plurality of elastic installation positions in the annular floating body; the photovoltaic panel assembly includes a plurality of photovoltaic panels, wherein the plurality of photovoltaic panels are arranged in the elastic installation positions, and the plurality of photovoltaic panels are combined to form a photovoltaic surface;

[0008] A rotating unit is arranged below the photovoltaic part in the annular float, and a maintenance part is arranged on the rotating unit. The rotating unit and the maintenance part are equipped with a control unit, which can control the rotating unit to rotate along the circumferential direction of the annular float and control the maintenance part to move radially on the rotating unit along the annular float.

[0009] In some embodiments, the photovoltaic installation unit includes a plurality of tension cables, which are arranged in the annular floating body at intervals along the cross-section of the annular floating body, and a plurality of elastic installation positions are formed between every two adjacent tension cables along their length direction.

[0010] Furthermore, the tension cable is elastic, and each tension cable has pre-tension after installation.

[0011] In some embodiments, the rotating unit includes a crossbeam, both ends of the crossbeam are provided with driving parts, the inner wall of the annular floating body is provided with a driving track, and the driving part can drive the crossbeam to rotate along the driving track.

[0012] Furthermore, the driving part is a rotary drive motor, which is controlled by a control unit. The rotary drive motor is connected to the cross beam, and the output end of the rotary drive motor is connected to a planetary gear. The drive track includes an annular groove opened along the circumference of the inner wall of the annular float, and an annular track is arranged in the annular groove. The annular track has gears, and the planetary gears are meshed with the gears.

[0013] In some embodiments, the maintenance part includes a sliding table, the sliding table is equipped with a motor drive device, and the control unit is disposed on the sliding table.

[0014] Furthermore, a guardrail is arranged on the upper periphery of the sliding platform.

[0015] In some embodiments, the annular floating body is provided with a heave plate below the rotating unit, and the area of ​​the heave plate is not less than the cross-sectional area of ​​the annular floating body.

[0016] In some embodiments, the towing assembly includes a plurality of mooring cables connected to the outer wall of the annular buoy at intervals.

[0017] The present invention also provides a control method for a floating offshore photovoltaic system that is easy to maintain, comprising the following steps:

[0018] The control unit controls the rotating unit of the floating offshore photovoltaic system to rotate along the circumference of the annular floating body according to the control instruction;

[0019] The control unit controls the maintenance unit of the floating offshore photovoltaic system to move along the radial direction of the annular floating body on the rotating unit according to the control instruction.

[0020] Compared with the prior art, the present invention provides a floating offshore photovoltaic system that is easy to maintain and a control method thereof, which has the following beneficial effects:

[0021] The present invention discloses a floating offshore photovoltaic system which is easy to maintain. The photovoltaic system comprises an annular float and a photovoltaic part arranged on the annular float, and a traction assembly is connected to the periphery of the annular float; when the annular float floats on a working liquid surface, the photovoltaic part can be located above the working liquid surface, and the traction assembly can make the annular float located in a working area; wherein: the photovoltaic part comprises a photovoltaic installation unit and a photovoltaic panel assembly arranged thereon, and the photovoltaic installation unit can form a plurality of elastic installation positions in the annular float; the photovoltaic panel assembly comprises a plurality of photovoltaic panels, and the plurality of photovoltaic panels are correspondingly arranged at a plurality of elastic installation positions, and the plurality of photovoltaic panels are combined to form a photovoltaic surface; a rotating unit is arranged in the annular float below the photovoltaic part, and a maintenance part is arranged on the rotating unit, and a control unit is configured for the rotating unit and the maintenance part, and the control unit can: control the rotating unit to rotate along the circumferential direction of the annular float, and control the maintenance part to move along the radial direction of the annular float on the rotating unit. Based on the above, the present invention realizes flexible rotation and radial movement of photovoltaic panels by setting a rotating unit in the annular float and setting a maintenance unit on the rotating unit, and coordinating the control of the control unit, so that the operation and maintenance personnel can reach the bottom of the photovoltaic panel that needs maintenance in the photovoltaic assembly, and then carry out the operation and maintenance of the photovoltaic assembly. This design simplifies the maintenance work of photovoltaic panels to a great extent, allowing staff to more easily approach photovoltaic panels that need to be repaired or replaced, thereby improving maintenance efficiency and safety. The elastic mounting position formed by the photovoltaic mounting unit of the present invention reduces the installation cost compared to the existing photovoltaic assembly bracket. The photovoltaic mounting unit uses tension cables to form an elastic mounting position, which can provide stable support for the photovoltaic panel and enhance the overall stability of the system. The system of the present invention can stably collect solar energy above the working liquid surface and convert it into electrical energy through the reasonable design of structure and control, effectively utilizing the ocean space for the production of clean energy, and has good practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 A schematic structural diagram of a photovoltaic system in a floating offshore photovoltaic system and a control method thereof that is easy to maintain according to the present invention;

[0024] Figure 2It is a schematic diagram of the partial structure of the photovoltaic part in a floating offshore photovoltaic system and a control method thereof that is easy to maintain according to the present invention;

[0025] Figure 3 This is a schematic structural diagram of an annular floating body in a floating offshore photovoltaic system that is easy to maintain and a control method thereof according to the present invention;

[0026] Figure 4 It is a partial structural schematic diagram of a rotating unit in a floating offshore photovoltaic system and a control method thereof that is easy to maintain according to the present invention;

[0027] Figure 5 The present invention is a partial structural schematic diagram of a maintenance part of a floating offshore photovoltaic system that is easy to maintain and a control method thereof.

[0028] Among them, 1. annular floating body, 2. photovoltaic panel, 3. tension cable, 4. crossbeam; 5. rotary drive motor, 6. planetary gear, 7. annular groove, 8. annular track, 9. sliding table, 10. motor drive device, 11. guardrail, 12. heave plate, 13. mooring cable. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] How to improve the stability of photovoltaic panels during offshore installation, reduce installation costs, and facilitate operators to inspect or replace photovoltaic panels, thereby improving the efficiency of operation and maintenance.

[0036] Based on this, Figure 1 As shown, the present invention provides a floating offshore photovoltaic system that is easy to maintain. The photovoltaic system includes an annular floating body 1 and a photovoltaic part arranged on the annular floating body 1. The annular floating body 1 has a traction assembly. When the annular floating body 1 floats on the working liquid surface, the photovoltaic part can be located above the working liquid surface, and the traction assembly can make the annular floating body located in the working area; wherein:

[0037] The photovoltaic part includes a photovoltaic installation unit and a photovoltaic panel assembly arranged thereon, the photovoltaic installation unit can form a plurality of elastic installation positions in the annular floating body 1; the photovoltaic panel assembly includes a plurality of photovoltaic panels 2, the plurality of photovoltaic panels 2 are arranged in the elastic installation positions, and the plurality of photovoltaic panels 2 are combined to form a photovoltaic surface;

[0038] A rotating unit is arranged below the photovoltaic part in the annular floating body 1, and a maintenance part is arranged on the rotating unit. The rotating unit and the maintenance part are provided with a control unit, which can: control the rotating unit to rotate circumferentially along the annular floating body 1, and control the maintenance part to move radially on the rotating unit along the annular floating body.

[0039] The present invention discloses a floating offshore photovoltaic system that is easy to maintain. The structural design of the annular floating body 1 is adopted. The annular floating body 1 adopts an annular design, which not only increases the stability of the structure, but also enables the entire system to more effectively resist the influence of wind and waves. The annular structure is also convenient for arranging photovoltaic components to achieve effective use of space. Combined with the photovoltaic part arranged above the annular floating body 1, the ocean space is effectively utilized for collecting and converting solar energy. At the same time, the built-in rotating unit and maintenance part of the photovoltaic system, under the control of the control unit, can make the rotating unit rotate flexibly and the maintenance part move radially, thereby simplifying the maintenance and inspection work of the photovoltaic panel 2 and improving the maintenance efficiency and safety. The present invention not only reduces labor costs, but also can extend the service life of the photovoltaic system through convenient maintenance.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the present invention is a floating offshore photovoltaic system that is easy to maintain, and the photovoltaic installation unit includes a plurality of tensioning cables 3, and the plurality of tensioning cables 3 are arranged at intervals along the cross-section of the annular floating body 1 in the annular floating body 1, and a plurality of elastic installation positions are formed between each two adjacent tensioning cables 3 along the length direction thereof. The tensioning cables 3 are elastic, and each tensioning cable 3 has a pre-tension after installation. The present invention arranges tensioning cables 3 above the annular floating body 1, and a photovoltaic panel 2 is installed above the tensioning cables 3. The present invention adopts the structure of tensioning cables 3 to replace the conventional photovoltaic component bracket, thereby reducing the installation cost. After installation, the elastic tensioning cables 3 have a certain pre-tension, and the photovoltaic component is suspended above the annular floating body 1 by the tensioning cables 3. The installation structure not only reduces the cost of materials, but also reduces the load of the annular floating body 1, thereby improving the overall efficiency of the photovoltaic system. The pre-tension of the tensioning cables 3 can ensure the stability of the photovoltaic component in the working state to a certain extent, and avoid shaking caused by wind and waves.

[0041] like Figure 3 and Figure 4As shown, in some embodiments, the present invention is easy to maintain the floating offshore photovoltaic system, the rotating unit includes a beam 4, both ends of the beam 4 are provided with a driving part, the inner wall of the annular floating body 1 is provided with a driving track, and the driving part can drive the beam 4 to rotate along the driving track. The driving part is a rotating driving motor 5, the rotating driving motor 5 is controlled by a control unit, the rotating driving motor 5 is connected to the beam 4, and the output end of the rotating driving motor 5 is connected to a planetary gear 6; the driving track includes an annular groove 7 opened along the circumference of the inner wall of the annular floating body 1, and an annular track 8 is arranged in the annular groove 7, the annular track 8 has a gear, and the planetary gear 6 is meshed with the gear. Specifically, the inner wall of the annular floating body 1 of the present invention is provided with a groove. The beam 4 spans the inner side of the annular floating body 1, and both ends of the beam 4 are located in the groove of the annular floating body 1. The rotating driving motor 5 is installed at both ends of the beam 4, and the planetary gear 6 is installed on the output shaft of the rotating driving motor 4. The annular track 8 is installed in the groove of the annular floating body 1, and a gear is arranged above the annular track 8, and the gear can be meshed with the planetary gear 6 of the rotating driving motor. The planetary gears 6 are driven to rotate by the rotary drive motors 5 at both ends of the cross beam 4 , thereby driving the cross beam 4 to rotate in the annular floating body 1 .

[0042] like Figure 1 and Figure 4 As shown, in some embodiments, the floating offshore photovoltaic system that is easy to maintain of the present invention is provided with a heave plate 12 on the lower outer side of the annular floating body 1, and the heave plate 12 is used to increase the additional mass and additional damping of the annular floating body 1, thereby improving the wave resistance of the annular floating body 1. Specifically, the heave plate 12 can reduce the heave of the annular floating body 1 under the action of waves, such as up and down fluctuations, and roll, such as left and right shaking, so that the photovoltaic components maintain a relatively stable working state. For example, in actual operation, when waves act on the floating offshore photovoltaic system, the floating body will produce corresponding heave and roll motions. The heave plate 12 can slow down the speed and amplitude of these movements by increasing the additional mass and additional damping of the annular floating body 1. The additional mass can provide a greater inertial force, so that the annular floating body 1 can remain relatively stable when impacted by waves; and the additional damping can consume the energy of the annular floating body 1 during the movement process, so that the movement gradually decays and tends to be stable. Through the design of the heave plate 12, the damage or performance degradation of the photovoltaic components caused by excessive wind and waves is effectively avoided, and the service life of the entire photovoltaic system is improved.

[0043] like Figure 5As shown, in the floating offshore photovoltaic system of the present invention, a sliding platform 9 is also provided on the crossbeam 4. A motor drive device 10 is installed below the sliding platform 9, which can make the sliding platform 9 move forward and backward on the crossbeam, and a guardrail 11 is installed above the sliding platform 9. In the actual design, the crossbeam 4 can be designed with a slide rail (not shown in the figure) for the sliding platform 9 to slide along its length direction. The sliding platform 9 is controlled by the motor drive device 10 to move on the slide rail of the crossbeam 4. Of course, if necessary, a limit block is designed, so that the sliding platform 9 can be stably stopped when maintenance is required. The corresponding limit part is also designed including the circular track 8, so that the crossbeam 4 and the sliding platform 9 cooperate to send the operation and maintenance personnel to the corresponding photovoltaic panel, and then perform the operation.

[0044] When the floating offshore photovoltaic system needs operation and maintenance, the operation and maintenance personnel can sit on the top of the sliding platform 9, and by manipulating the sliding platform 9 to move back and forth on the beam 4 and the beam 4 to rotate in the annular float 1, they can reach the bottom of any photovoltaic module to perform operation and maintenance operations, which is relatively convenient. The control unit of the present invention can receive control instructions, automatically drive the rotating unit and the maintenance unit to perform precise movements, realize the automatic control of the photovoltaic system, reduce labor costs, and improve work efficiency. The guardrail 11 above the sliding platform 9 provides a safe working environment for the staff and reduces the risk of accidents during maintenance. The present invention combines the rotating unit, the maintenance unit, the drive assembly and the drive track to enable the operation and maintenance personnel to easily reach the bottom of any photovoltaic module for maintenance and inspection without leaving the annular float 1. In this way, not only the efficiency of operation and maintenance is improved, but also the operation and maintenance costs and safety hazards are reduced to a large extent.

[0045] In a specific embodiment, the floating offshore photovoltaic system of the present invention, wherein the traction assembly includes a plurality of mooring cables 13 connected to the outer wall of the annular floating body 1 at intervals, so that the annular floating body 1 can be moored in a predetermined working sea area. The mooring cable is a rope used to fix the floating offshore photovoltaic system when it is docked. It ensures that the floating offshore photovoltaic system remains stable under various environmental conditions by connecting to the dock or other fixed areas, and prevents drift or damage caused by factors such as wind, waves, and water currents. In actual operation, the mooring cable 13 can be made of high-strength materials, such as polyester fiber, nylon or steel wire rope. These materials have the characteristics of wear resistance, corrosion resistance, high strength, good elasticity, etc., and can withstand the huge tension and impact force generated by the floating offshore photovoltaic system during the mooring process. The present invention stably fixes the annular floating body 1 in the working area through a plurality of mooring cables 13, ensuring that the photovoltaic system can operate stably at a predetermined position, is not affected by natural environments such as ocean currents, wind and waves, and improves the working stability of the photovoltaic system.

[0046] Based on the above-mentioned floating offshore photovoltaic system that is easy to maintain, the present invention also proposes a control method for the floating offshore photovoltaic system, comprising the following steps:

[0047] The control unit controls the rotating unit of the floating offshore photovoltaic system to rotate along the circumferential direction of the annular buoy 1 according to the control instructions; the control unit controls the maintenance part of the floating offshore photovoltaic system to move radially along the annular buoy 1 on the rotating unit according to the control instructions. As for the control unit, it can be set on the sliding table 9 as an option to facilitate real-time operation by operation and maintenance personnel. Or the control unit can be set on a control console outside the floating offshore photovoltaic system, etc., for unified control. The design is selected according to actual needs. The present invention controls the movement and rotation of the rotating unit and the maintenance part thereon by the control unit, and then drives the maintenance personnel to the photovoltaic module area that needs inspection and maintenance, which reduces the labor of the maintenance personnel and improves the maintenance efficiency of the photovoltaic modules.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A floating offshore photovoltaic system that is easy to maintain, characterized in that: The photovoltaic system comprises an annular floating body (1) and a photovoltaic part arranged on the annular floating body (1), wherein the annular floating body (1) has a traction assembly; when the annular floating body (1) floats on a working liquid surface, the photovoltaic part can be located above the working liquid surface, and the traction assembly can make the annular floating body (1) located in a working area; wherein: The photovoltaic part comprises a photovoltaic installation unit and a photovoltaic panel assembly arranged thereon, wherein the photovoltaic installation unit can form a plurality of elastic installation positions in the annular floating body (1); the photovoltaic panel assembly comprises a plurality of photovoltaic panels (2), wherein a plurality of the photovoltaic panels (2) are arranged at the elastic installation positions, and a plurality of the photovoltaic panels (2) are combined to form a photovoltaic surface; A rotating unit is arranged inside the annular float (1) below the photovoltaic part, and the rotating unit is provided with a maintenance part. The rotating unit and the maintenance part are configured with a control unit, and the control unit is capable of: controlling the rotating unit to rotate along the circumferential direction of the annular float (1), and controlling the maintenance part to move radially on the rotating unit along the annular float (1).

2. The easy-to-maintain floating offshore photovoltaic system according to claim 1, characterized in that: The photovoltaic installation unit comprises a plurality of tension cables (3), wherein the plurality of tension cables (3) are arranged at intervals along the cross section of the annular floating body (1) inside the annular floating body (1), and a plurality of elastic installation positions are formed between each two adjacent tension cables (3) along their length direction.

3. The easy-to-maintain floating offshore photovoltaic system according to claim 2, characterized in that: The tensioning cables (3) are elastic, and each tensioning cable (3) has a pre-tension after installation.

4. The easy-to-maintain floating offshore photovoltaic system according to claim 1, characterized in that: The rotating unit comprises a cross beam (4), both ends of the cross beam (4) are provided with driving parts, the inner wall of the annular floating body (1) is provided with a driving track, and the driving part can drive the cross beam (4) to rotate along the driving track.

5. The easy-to-maintain floating offshore photovoltaic system according to claim 4, characterized in that: The driving part is a rotary drive motor (5), the rotary drive motor (5) is controlled by a control unit, the rotary drive motor (5) is connected to the cross beam (4), and the output end of the rotary drive motor (5) is connected to a planetary gear (6); the driving track includes an annular groove (7) provided on the inner wall of the annular floating body (1) along the circumference thereof, an annular track (8) is arranged in the annular groove (7), the annular track (8) has a gear, and the planetary gear (6) is meshed with the gear.

6. The easy-to-maintain floating offshore photovoltaic system according to claim 1, characterized in that: The maintenance unit comprises a sliding platform (9), the sliding platform (9) is provided with a motor drive device (10), and the control unit is arranged on the sliding platform (9).

7. The easy-to-maintain floating offshore photovoltaic system according to claim 6, characterized in that: A guardrail (11) is arranged on the upper periphery of the sliding platform (9).

8. The easy-to-maintain floating offshore photovoltaic system according to claim 1, characterized in that: The annular floating body (1) is provided with a heave plate (12) below the rotating unit, and the area of ​​the heave plate (12) is not less than the cross-sectional area of ​​the annular floating body (1).

9. The easy-to-maintain floating offshore photovoltaic system according to claim 1, characterized in that: The traction assembly comprises a plurality of mooring cables (13) connected to the outer wall of the annular floating body (1) at intervals.

10. A control method for a floating offshore photovoltaic system that is easy to maintain according to any one of claims 1 to 9, characterized in that: The steps include: The control unit controls the rotating unit of the floating offshore photovoltaic system to rotate along the circumference of the annular floating body (1) according to the control instruction; The control unit controls the maintenance unit of the floating offshore photovoltaic system to move along the radial direction of the annular floating body (1) on the rotating unit according to the control instructions.

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