Offshore fixed photovoltaic equipment

Abstract

The invention discloses offshore fixed photovoltaic equipment in the technical field of ocean photovoltaic power generation, and aims to solve the problem that the photovoltaic equipment in the prior art is easy to be flapped by sea waves and corroded by an ocean environment when being deployed offshore. The first pile leg and the second pile leg are used for supporting the photovoltaic panel assembly on the sea surface, the photovoltaic panel assembly is connected with the second pile leg, the first pile leg is connected with the photovoltaic panel assembly through a hydraulic jacking device, and the first pile leg is shorter than the second pile leg. The height of the photovoltaic panel assembly on one side of the first pile leg can be controlled through stretching and retracting of the hydraulic jacking device. According to the specific principle, the photovoltaic panel assembly is erected on the sea surface through the pile legs, and corrosion of marine salinization and attachment of marine organisms are avoided; moreover, the inclination angle of the photovoltaic panel assembly is adjusted through the hydraulic jacking device, the invasion of sea waves to the photovoltaic panel assembly is reduced, the relatively complex sea wave conditions can be dealt with conveniently, and the service life of the photovoltaic panel assembly is prolonged.

Description

Technical Field

[0001] The invention relates to offshore fixed photovoltaic equipment, belonging to the technical field of marine photovoltaic power generation. Background Art

[0002] The existing fixed solar photovoltaic power generation equipment in China is mainly used in lakes, reservoirs and other environments with less wind, wave and current conditions, but these structures are not suitable for offshore photovoltaics. The existing photovoltaic power generation platforms have poor wind and wave resistance and are easily damaged. Photovoltaic power generation components are easily attached to organisms by waves or salt stains appear on photovoltaic power generation components, which affects the power generation efficiency and the service life of photovoltaic power generation components. Summary of the invention

[0003] The purpose of the present application is to overcome the deficiencies in the prior art and to provide an offshore fixed photovoltaic device with a longer service life in the offshore.

[0004] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: The present application provides an offshore fixed photovoltaic device, comprising: A photovoltaic panel assembly, a first pile leg and a second pile leg higher than the first pile leg, wherein the roots of the first pile leg and the second pile leg are used to be fixed on the seabed; The hydraulic lifting device comprises a hydraulic piston and a hydraulic cylinder for driving the hydraulic piston to extend and retract; the hydraulic piston is rotatably connected to the second base, and the second base is fixedly connected to the photovoltaic panel assembly; the hydraulic cylinder is rotatably connected to the first base, and the first base is fixedly connected to the first pile leg; The photovoltaic panel assembly is fixedly connected to the third base at a certain distance from the second base, the second pile leg is fixedly connected to the fourth base, and the third base is rotatably connected to the fourth base; The hydraulic jacking device is used to control the inclination angle of the photovoltaic panel assembly toward the side where the waves hit.

[0005] In some embodiments of the present application, a photovoltaic bracket with a grid-mounted structure is also included, wherein the photovoltaic panel assembly is connected to one side of the photovoltaic bracket, and the other side of the photovoltaic bracket is connected to the second base and the third base.

[0006] In some embodiments of the present application, the photovoltaic support includes a transverse beam, a longitudinal beam and a vertical support beam, and the transverse beam, the longitudinal beam and the vertical support beam intersect with each other and are connected to each other through a welding box at the intersection.

[0007] In some embodiments of the present application, a photovoltaic panel fixing part is also included, wherein both ends of the photovoltaic panel fixing part are fixed inside the grid mounting structure of the photovoltaic bracket, and the middle part of the photovoltaic panel fixing part protrudes from the grid mounting structure and is supported and connected to the photovoltaic panel assembly.

[0008] In some embodiments of the present application, one or more platform bottom bases are provided on a side of the photovoltaic bracket facing away from the photovoltaic panel assembly, the area of ​​the platform bottom base is larger than the second base and the third base, and the second base and the third base are respectively fixedly connected to the platform bottom base.

[0009] In some embodiments of the present application, the hydraulic jacking device also includes a hydraulic oil pump, the oil port of the hydraulic oil pump is connected to the hydraulic cylinder, the signal end of the hydraulic oil pump is connected to the electrical signal of the inclination sensor, and the inclination sensor is fixedly connected to the photovoltaic panel assembly.

[0010] In some embodiments of the present application, the end of the hydraulic cylinder is fixedly connected to the rotating bracket, and both ends of the rotating shaft are connected to the rotating bracket; The first base includes a base bottom plate and a base top cover which overlap each other, and overlapping surfaces of the base bottom plate and the base top cover form a groove for the rotation of the rotating shaft.

[0011] In some embodiments of the present application, the end of the hydraulic piston is fixedly connected to the rotating bracket, and both ends of the rotating shaft are connected to the rotating bracket; The second base includes a base bottom plate and a base top cover which overlap each other, and overlapping surfaces of the base bottom plate and the base top cover form a groove for the rotation of the rotating shaft.

[0012] In some embodiments of the present application, the structure of one of the third base and the fourth base is: comprising a rotating base chassis, a surface of the rotating base chassis is provided with two shaft support sheets, and a rotating shaft is connected between the shaft support sheets; Another structure includes a base bottom plate and a base top cover which overlap each other, wherein overlapping surfaces of the base bottom plate and the base top cover form a groove for the rotation of the rotating shaft.

[0013] In some embodiments of the present application, an ultrasonic wave measuring instrument is installed on any pile leg, and the ultrasonic wave measuring instrument is electrically connected to the signal end of the hydraulic oil pump. The hydraulic oil pump controls the inclination angle of the photovoltaic panel assembly toward the wave-incoming side according to the wave height.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The offshore fixed photovoltaic equipment provided in the present application uses pile legs to stand the photovoltaic panel assembly on the sea surface, thereby avoiding the erosion of marine salt and the attachment of marine organisms; and, the inclination angle of the photovoltaic panel assembly is adjusted by a hydraulic jacking device to reduce the intrusion of waves into the photovoltaic panel assembly, making it easier to deal with more complex wave conditions and increasing the service life of the photovoltaic panel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic diagram of the structure and working principle of the offshore fixed photovoltaic device provided in this embodiment; Figure 2 yes Figure 1 Schematic diagram of the structure of the photovoltaic bracket; Figure 3 yes Figure 1 Schematic diagram of the structure of the hydraulic jacking device; Figure 4 yes Figure 3 Schematic diagram of the structure after the hydraulic cylinder and hydraulic piston are disassembled; Figure 5 yes Figure 3 A schematic diagram of the structure at the third base and the fourth base; Figure 6 yes Figure 1 Schematic diagram of the connection between the photovoltaic bracket and the photovoltaic panel fixings; Figure 7 yes Figure 5 A schematic diagram of the structure after the third base and the fourth base are decomposed; In the figure: 1. first pile leg; 2. second pile leg; 3. photovoltaic bracket; 4. photovoltaic panel assembly; 5. inclination sensor; 6. first base; 7. hydraulic jacking device; 8. hydraulic oil pump; 9. second base; 10. hydraulic oil pump support platform; 11. fourth base; 12. platform bottom base; 13. welding box; 14. vertical support beam; 15. longitudinal beam; 16. hydraulic cylinder; 17. cross beam; 18. hydraulic piston; 20. base chassis; 21. base top cover; 22. rotating base chassis; 23. rotating shaft; 24. third base; 25. rotating bracket; 26. shaft support plate; 27. photovoltaic panel fixing part; 28. ultrasonic wave measuring instrument. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of this application / this application to clearly and completely describe the technical solutions in the embodiments of this application / this application. Obviously, the described embodiments are only part of the embodiments of this application / this application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the application / this application and its application or use. Embodiment 1

[0018] This embodiment provides an offshore fixed photovoltaic device to solve the problem in the prior art that photovoltaic devices deployed offshore are easily affected by waves and corrosion from the marine environment.

[0019] refer to Figure 1 , Figure 3 and Figure 5 The offshore fixed photovoltaic device provided in this embodiment includes a photovoltaic panel assembly 4, a first pile leg 1 and a second pile leg 2 higher than the first pile leg 1, and the roots of the first pile leg 1 and the second pile leg 2 are used to be fixed on the seabed; The hydraulic lifting device 7 includes a hydraulic piston 18 and a hydraulic cylinder 16 for driving the hydraulic piston 18 to extend and retract; the hydraulic piston 18 is rotatably connected to the second base 9, and the second base 9 is fixedly connected to the photovoltaic panel assembly 4; the hydraulic cylinder 16 is rotatably connected to the first base 6, and the first base 6 is fixedly connected to the first pile leg 1; The photovoltaic panel assembly 4 is fixedly connected to the third base 24 at a certain distance from the second base 9, the second pile leg 2 is fixedly connected to the fourth base 11, and the third base 24 is rotatably connected to the fourth base 11; The hydraulic jacking device 7 is used to control the inclination angle of the photovoltaic panel assembly 4 toward the side where the waves strike.

[0020] It is worth noting that the direction of offshore waves is relatively fixed, pointing from the deep sea to the shore.

[0021] How to use: Reference Figure 1 , deploy the first pile leg 1 and the second pile leg 2 according to the direction of the waves, the first pile leg 1 is closer to the direction of the waves than the second pile leg 2. As one embodiment, when the first pile leg 1 and the second pile leg 2 are arranged in a row, the direction of the waves is perpendicular to the arrangement direction of the first pile leg 1, and then other components are installed. According to the height of the waves, adjust Figure 3 The extension of the hydraulic piston 18 relative to the hydraulic cylinder 16 makes the photovoltaic panel assembly 4 Figure 5 The third base 24 and the fourth base 11 rotate, which is reflected in Figure 1The figure shows the lifting and lowering changes of the photovoltaic panel assembly 4 near the first pile leg 1. The influence of the waves is controlled by controlling the inclination angle of the photovoltaic panel assembly 4 facing the direction of the waves. When the wave height is low, the inclination angle of the photovoltaic panel assembly 4 facing the direction of the waves can be controlled according to the optimal sun pointing to be low; when the wave height has a certain influence, the hydraulic jacking device 7 is pushed upward to make the inclination angle of the photovoltaic panel assembly 4 facing the direction of the waves close to the horizontal, so as to reduce the influence of the waves; when the wave height is higher, the hydraulic jacking device 7 is further pushed upward to make the height of the photovoltaic panel assembly 4 near the first pile leg 1 higher than the side near the second pile leg 2, and the front side of the photovoltaic panel assembly 4 that receives sunlight faces away from the direction of the waves, so as to minimize the negative impact of the waves on the photovoltaic equipment. As one embodiment, the wave height can be set according to the weather forecast or the local ocean monitoring system.

[0022] Therefore, the offshore fixed photovoltaic equipment provided in this embodiment uses pile legs to stand the photovoltaic panel assembly 4 on the sea surface, avoiding the erosion of marine salt and the attachment of marine organisms. In addition, the inclination angle of the photovoltaic panel assembly 4 is adjusted by the hydraulic jacking device 7 to reduce the invasion of waves on the photovoltaic panel assembly 4 and increase the service life of the photovoltaic panel assembly 4. Embodiment 2

[0023] This embodiment provides an offshore fixed photovoltaic device. This embodiment is optimized on the basis of the first embodiment to improve the technical effect and refine the technical solution. For the contents not fully described in this embodiment, please refer to the first embodiment.

[0024] When the sea waves inevitably hit the back of the photovoltaic panel assembly 4, in order to reduce the impact of the sea waves and slow down the release of the kinetic energy of the sea waves, as one embodiment, refer to Figure 2 The offshore fixed photovoltaic device also includes a photovoltaic bracket 3 with a grid structure, a photovoltaic panel assembly 4 is connected to one side of the photovoltaic bracket 3, and the other side of the photovoltaic bracket 3 is connected to the second base 9 and the third base 24. The photovoltaic bracket 3 with a grid structure reduces the impact of the waves and slows down the release of the kinetic energy of the waves. The grid structure can be a variety of two-dimensional or three-dimensional multi-gap structures such as honeycomb and crystal.

[0025] It is also worth noting that the grid-mounted photovoltaic bracket 3 facilitates sunlight reflected from the sea surface to enter the photovoltaic panel assembly 4 along the back of the photovoltaic bracket 3 to generate electricity.

[0026] As one example, refer to Figure 2 , Figure 3 and Figure 5The photovoltaic support 3 includes a crossbeam 17, a longitudinal beam 15 and a vertical support beam 14. The crossbeam 17, the longitudinal beam 15 and the vertical support beam 14 intersect with each other and are connected to each other at the intersection through a welding box 13 to form a grid structure with multiple rectangular gaps. The protection of the welding box 13 can effectively prevent node corrosion and end point corrosion. Specifically, the crossbeam 17, the longitudinal beam 15 and the vertical support beam 14 can be cross-inserted into the welding box 13, and then the gaps between the crossbeam 17, the longitudinal beam 15 and the vertical support beam 14 and the welding box 13 are seamlessly welded to avoid water. Alternatively, the crossbeam 17, the longitudinal beam 15 and the vertical support beam 14 are cross-welded, and then the welding box 13 is installed at the intersection, and the intersection is protected inside the welding box 13 to prevent the weld from rusting. When the waves hit the photovoltaic bracket 3, the water flows directly down, hits and adheres to the cross beam 17, the longitudinal beam 15 and the vertical support beam 14, and finally reduces the peak value of the kinetic energy transferred per unit time caused by the waves, so that the total kinetic energy generated by the waves is slowly applied to the photovoltaic bracket 3, and then transmitted directly to the seabed through the pile legs.

[0027] As one embodiment, the cross beam 17, the longitudinal beam 15 and the vertical support beam 14 are subjected to anti-corrosion treatment, such as plating anti-corrosion metal or adding a coating.

[0028] As one example, refer to Figure 6 The offshore fixed photovoltaic device also includes a photovoltaic panel fixing member 27, the two ends of which are fixed inside the grid mounting structure of the photovoltaic bracket 3, and the middle part of the photovoltaic panel fixing member 27 protrudes from the grid mounting structure and is supported and connected with the photovoltaic panel assembly 4. The two ends of the photovoltaic panel fixing member 27 can be connected to the cross beam 17, the longitudinal beam 15 and the vertical support beam 14 by welding, bolts, etc., and the distance between the photovoltaic panel assembly 4 and the photovoltaic bracket 3 can be adjusted by adjusting the depth of the two ends of the photovoltaic panel fixing member 27 extending into the grid mounting structure of the photovoltaic bracket 3.

[0029] refer to Figure 3 The hydraulic jacking device 7 further includes a hydraulic oil pump 8, the oil port of the hydraulic oil pump 8 is connected to the hydraulic cylinder 16, the signal end of the hydraulic oil pump 8 is electrically connected to the inclination sensor 5, and the inclination sensor 5 is fixedly connected to the photovoltaic panel assembly 4. The inclination sensor 5 measures the inclination of the photovoltaic panel assembly 4, and controls the oil inlet and outlet of the hydraulic oil pump 8 in response to the difference between the actual inclination and the set inclination, so as to achieve the calibration of the inclination of the photovoltaic panel assembly 4 toward the side where the waves are coming.

[0030] As one of the embodiments, a controller is provided inside the inclination sensor 5 for storing and executing logic instructions. As one of the embodiments, the offshore fixed photovoltaic device also includes a communication module connected to the electrical signal of the inclination sensor 5, and the communication module is used for the operator to remotely extract the information of the offshore fixed photovoltaic device and control the offshore fixed photovoltaic device. As one of the embodiments, the communication module transmits information through the transmission line carrier communication technology. As one of the embodiments, the communication module controls the duty cycle of the electrical signal of one of the cables of the transmission line through the digital-to-analog conversion technology, so as to send the operating data of the offshore fixed photovoltaic device to the remote power service module, and the remote power service module converts the duty cycle of the electrical signal into a digital signal through the analog-to-digital conversion technology to read the operating data; the remote power service module controls the offshore fixed photovoltaic device through the same method, so as to realize signal transmission by relying on the power line without setting up additional communication lines.

[0031] refer to Figure 3 and Figure 4 , in a further but non-limiting embodiment of the present application, the end of the hydraulic cylinder 16 is fixedly connected to the rotating bracket 25, and both ends of the rotating shaft 23 are connected to the rotating bracket 25; The first base 6 includes a base bottom plate 20 and a base top cover 21 which cover each other. The covering surfaces of the base bottom plate 20 and the base top cover 21 form a groove for the rotation of the rotating shaft 23. The rotating shaft 23 rotates in the groove. When the photovoltaic panel assembly 4 is impacted by waves, the base top cover 21 can effectively prevent the rotating shaft 23 from falling out. As one embodiment, the base top cover 21 is bolted to the base top cover 21.

[0032] Similar functions to the first base 6, see Figure 3 and Figure 4 , the end of the hydraulic piston 18 is fixedly connected to the rotating bracket 25, and both ends of the rotating shaft 23 are connected to the rotating bracket 25; The second base 9 includes a base chassis 20 and a base top cover 21 that cover each other. The covering surfaces of the base chassis 20 and the base top cover 21 form a groove for the rotation of the rotating shaft 23. The base chassis 20 and the base top cover 21 at the second base 9 also have the function of preventing the rotating shaft 23 from escaping and resisting the impact of waves.

[0033] As one example, refer to Figure 5 and Figure 7The third base 24 includes a base chassis 20 and a base top cover 21 that cover each other, and the covering surfaces of the base chassis 20 and the base top cover 21 form a groove for the rotation of the rotating shaft 23. The fourth base 11 includes a rotating base chassis 22, and the surface of the rotating base chassis 22 is provided with two shaft support sheets 26, and the rotating shaft 23 is connected between the shaft support sheets 26. The base chassis 20 and the base top cover 21 at the third base 24 also have the effect of preventing the rotating shaft 23 from being hit by waves and escaping, which will not be repeated here. In addition, the structure between the third base 24 and the fourth base 11 can also be swapped.

[0034] In a further but non-limiting embodiment of the present application, the offshore fixed photovoltaic device further comprises an ultrasonic wave measuring instrument 28 mounted on any pile leg, the ultrasonic wave measuring instrument 28 is electrically connected to the signal end of the hydraulic oil pump 8, and the hydraulic oil pump 8 controls the inclination angle of the photovoltaic panel assembly 4 toward the wave-incoming side according to the wave height. Figure 3 In this embodiment, an ultrasonic wave measuring instrument 28 is arranged on the first pile leg 1 to measure the height of the waves below the first pile leg 1 in the most timely and accurate manner.

[0035] As one example, refer to Figure 3 A hydraulic oil pump support platform 10 is arranged on the top of the first pile leg 1, a hydraulic oil pump 8 is installed above the hydraulic oil pump support platform 10, and an ultrasonic wave measuring instrument 28 is installed below.

[0036] It is not difficult for those skilled in the art to see that under normal working conditions, the offshore fixed photovoltaic equipment is composed of a photovoltaic panel assembly 4, a photovoltaic bracket 3, a hydraulic jacking device 7, a fourth base 11 and a third base 24, a first pile leg 1 and a second pile leg 2 from top to bottom.

[0037] As one example, refer to Figure 3 and Figure 5 One or more platform bottom bases 12 are provided on the side of the photovoltaic bracket 3 facing away from the photovoltaic panel assembly 4. The area of ​​the platform bottom base 12 is larger than the platform bottom base 12. The platform bottom base 12 is the basis for the fixed installation of the second base 9 and the third base 24. The platform bottom base 12 forms a force-bearing connection relationship with multiple cross beams 17 and longitudinal beams 15 at the same time, so as to solve the problem that the photovoltaic bracket 3 with a grid-mounted structure is not easy to find a base for stable installation.

[0038] Compared with the first embodiment, the offshore fixed photovoltaic device provided in this embodiment mainly optimizes the stress of the multiple structures, improves the robustness and corrosion resistance of the structure when hit by waves, and proposes a specific plan for the control of the hydraulic jacking device 7.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided at", "provided with", "located", "installed", "set", etc. 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 directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. "Hinged" includes "rotational connection".

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An offshore fixed photovoltaic device, characterized in that: include, A photovoltaic panel assembly (4), a first pile leg (1) and a second pile leg (2) higher than the first pile leg (1), wherein the roots of the first pile leg (1) and the second pile leg (2) are used for fixing on the seabed; The hydraulic lifting device (7) comprises a hydraulic piston (18) and a hydraulic cylinder (16) for driving the hydraulic piston (18) to extend and retract; the hydraulic piston (18) is rotatably connected to the second base (9), and the second base (9) is fixedly connected to the photovoltaic panel assembly (4); the hydraulic cylinder (16) is rotatably connected to the first base (6), and the first base (6) is fixedly connected to the first pile leg (1); The photovoltaic panel assembly (4) is fixedly connected to the third base (24) at a certain distance from the second base (9), the second pile leg (2) is fixedly connected to the fourth base (11), and the third base (24) is rotatably connected to the fourth base (11); The hydraulic jacking device (7) is used to control the inclination angle of the photovoltaic panel assembly (4) towards the side where the waves strike.

2. The offshore fixed photovoltaic device according to claim 1, characterized in that: Also included is a photovoltaic support (3) with a grid-mounted structure, wherein the photovoltaic panel assembly (4) is connected to one side of the photovoltaic support (3), and the other side of the photovoltaic support (3) is connected to the second base (9) and the third base (24).

3. The offshore fixed photovoltaic device according to claim 2, characterized in that: The photovoltaic support (3) comprises a crossbeam (17), a longitudinal beam (15) and a vertical support beam (14); the crossbeam (17), the longitudinal beam (15) and the vertical support beam (14) intersect with each other and are connected to each other at the intersection through a welding box (13).

4. The offshore fixed photovoltaic device according to claim 3, characterized in that: It also comprises a photovoltaic panel fixing part (27), the two ends of which are fixed inside the grid mounting structure of the photovoltaic support (3), and the middle part of the photovoltaic panel fixing part (27) protrudes from the grid mounting structure and is supported and connected to the photovoltaic panel assembly (4).

5. The offshore fixed photovoltaic device according to claim 3, characterized in that: One or more platform bottom bases (12) are provided on a side of the photovoltaic support (3) facing away from the photovoltaic panel assembly (4); the area of ​​the platform bottom base (12) is larger than that of the second base (9) and the third base (24); the second base (9) and the third base (24) are respectively fixedly connected to the platform bottom base (12).

6. The offshore fixed photovoltaic device according to claim 1, characterized in that: The hydraulic jacking device (7) further comprises a hydraulic oil pump (8), the oil port of the hydraulic oil pump (8) being in communication with the hydraulic cylinder (16), the signal end of the hydraulic oil pump (8) being in electrical signal connection with the inclination sensor (5), and the inclination sensor (5) being fixedly connected with the photovoltaic panel assembly (4).

7. The offshore fixed photovoltaic device according to claim 1, characterized in that: The end of the hydraulic cylinder (16) is fixedly connected to the rotating bracket (25), and both ends of the rotating shaft (23) are connected to the rotating bracket (25); The first base (6) comprises a base bottom plate (20) and a base top cover (21) which overlap each other, and the overlapping surfaces of the base bottom plate (20) and the base top cover (21) form a groove for the rotation of the rotating shaft (23).

8. The offshore fixed photovoltaic device according to claim 1, characterized in that: The end of the hydraulic piston (18) is fixedly connected to the rotating bracket (25), and both ends of the rotating shaft (23) are connected to the rotating bracket (25); The second base (9) comprises a base bottom plate (20) and a base top cover (21) which overlap each other, and the overlapping surfaces of the base bottom plate (20) and the base top cover (21) form a groove for the rotation of the rotating shaft (23).

9. The offshore fixed photovoltaic device according to claim 1, characterized in that: The structure of one of the third base (24) and the fourth base (11) is as follows: comprising a rotating base chassis (22), wherein the surface of the rotating base chassis (22) is provided with two shaft support sheets (26), and the rotating shaft (23) is connected between the shaft support sheets (26); Another structure includes a base bottom plate (20) and a base top cover (21) that overlap each other, wherein the overlapping surfaces of the base bottom plate (20) and the base top cover (21) form a groove for the rotation of the rotating shaft (23).

10. The offshore fixed photovoltaic device according to any one of claims 1 to 9, characterized in that: It also includes an ultrasonic wave measuring instrument (28) installed on any pile leg, the ultrasonic wave measuring instrument (28) being electrically connected to a signal end of the hydraulic oil pump (8), and the hydraulic oil pump (8) controlling the inclination angle of the photovoltaic panel assembly (4) toward the wave-incoming side according to the wave height.

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