Novel double-shaft tracking photovoltaic power generation system and method thereof

Abstract

The invention discloses a novel double-shaft tracking photovoltaic power generation system and method, and aims to solve the problems of large occupied area and low power generation efficiency of a traditional photovoltaic module. The system comprises a supporting frame system floating on the water surface, an outer frame assembly, a photovoltaic device and a driving device, a photovoltaic panel in the photovoltaic device can rotate horizontally, and an illumination detection assembly is arranged. The supporting frame system comprises a bottom frame, a main buoy, a secondary buoy and the like. The outer frame assembly is annular and rotates through the rotating supporting piece. And the driving device is meshed with the gear ring through the worm to drive. According to the method, the illumination detection unit calculates the sun trajectory and the angle difference between the photovoltaic panel and the solar ray, then the outer frame assembly is controlled to vertically rotate to adjust the direction angle, the photovoltaic panel is controlled to horizontally rotate to adjust the elevation angle, the photovoltaic panel is made to be perpendicular to the solar ray, the energy utilization rate and the generating capacity are improved, land occupation is reduced, and stable operation of the system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a novel double-axis tracking photovoltaic power generation system and method. Background Art

[0002] In the field of floating photovoltaic power stations, traditional floating photovoltaic power stations are mainly composed of plastic floats and photovoltaic modules. On the one hand, the use of plastic floats has certain limitations. In the long-term outdoor environment, plastic materials are easily affected by factors such as ultraviolet rays, water, and temperature changes, resulting in aging and damage. This not only increases the maintenance cost and frequency of the power station, but also may pose a potential pollution risk to the water environment.

[0003] On the other hand, the installation method of photovoltaic modules also has obvious defects. Traditional photovoltaic modules are usually installed at a fixed angle. This installation method cannot adjust the angle of the photovoltaic modules in real time according to the change of the sun's position, resulting in the inability to make full use of light radiation. At different times of the day and in different seasons, the altitude angle and azimuth angle of the sun are constantly changing. The photovoltaic modules installed at a fixed angle cannot always be perpendicular to the sun's rays, thus reducing the efficiency of converting light energy into electrical energy and resulting in a low power generation of the system.

[0004] In addition, traditional floating photovoltaic power stations also have the problem of large land resource occupation. Due to their sub-optimal layout and installation method, they need to occupy a large area of land. This is undoubtedly an urgent problem to be solved today when land resources are becoming increasingly scarce. At the same time, the low power generation of the system and the large resource occupation lead to low energy utilization efficiency, and further make the economy of photovoltaic power generation worse and worse. It is difficult to compete with other energy forms in the market, restricting the further development of the photovoltaic power generation industry.

[0005] In summary, researching and developing a new structure and technology for floating photovoltaic power stations to improve energy utilization efficiency, increase system power generation, reduce land resource occupation, and improve economy has important practical significance for promoting the sustainable development of the photovoltaic power generation industry. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the currently adopted photovoltaic modules not only occupy a large area of land but also have low power generation efficiency.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: a novel double-axis tracking photovoltaic power generation system, including a support frame system floating on the water surface, an outer frame assembly vertically rotatably arranged on the support frame system, a photovoltaic device arrayed on the top of the outer frame assembly, and a driving device installed on the support frame system to drive the rotation of the outer frame assembly. The photovoltaic panels in the photovoltaic device are horizontally rotatably arranged. A light detection assembly for detecting the solar altitude angle and azimuth angle and transmitting information to the photovoltaic panel angle adjustment control unit is provided on the photovoltaic device. The light detection unit includes an ambient light intensity unit, an altitude angle position sensor, and an azimuth angle position sensor.

[0008] Preferably, the support frame system includes a circular bottom frame. A main floating cylinder is connected to the middle of the bottom of the bottom frame, and secondary floating cylinders are evenly connected to the edge of the bottom of the bottom frame. An installation shaft is coaxially and fixedly connected to the bottom frame. A connecting ring is rotatably connected to the installation shaft. The outer frame assembly is coaxially and fixedly connected to the connecting ring. Rotating support members for the outer frame assembly are evenly arranged on the bottom frame.

[0009] Preferably, the outer frame assembly is annular. The outer frame assembly includes an outer ring plate, an inner ring plate coaxially arranged inside the outer ring plate, and an annular mounting frame coaxially fixed inside the inner ring plate. The photovoltaic device is arranged on the mounting frame. The outer ring plate and the inner ring plate are connected by a transition plate. At least one support ring plate is coaxially arranged in the middle of the mounting frame. The rotating support members are evenly distributed at the bottoms of the transition plate and the support ring plate.

[0010] Preferably, the rotating support member includes a support rod fixed on the bottom frame and a support wheel rotatably arranged at the top of the support rod. The outer diameter of the end wall of the support wheel close to the center of the bottom frame is smaller than the outer diameter of the other end wall.

[0011] Preferably, a gear ring is coaxially and fixedly installed on the outer peripheral surface of the outer ring plate. The driving device includes a worm driven to rotate by a motor, and the worm meshes with the gear ring.

[0012] Preferably, the driving device includes a mounting platform fixed on the bottom frame. A housing is fixed on the mounting platform. The worm is rotatably connected in the housing. A mounting plate is fixed on the side wall of the housing. A clamping wheel is vertically rotatably connected to the bottom of the mounting plate, and the clamping wheel is in rolling connection with the inner side wall of the outer ring plate.

[0013] Preferably, the limiting devices are evenly angularly distributed around the axis of the bottom frame and are not less than three. The limiting device includes a fixed anchor block and a fixed sleeve connected to the anchor block by a cable. A guide wheel is vertically rotatably arranged at the bottom of the fixed sleeve, and the guide wheel is in rolling connection with the inner side wall of the outer ring plate.

[0014] Preferably, mounting shells are fixedly arranged at both ends of the bottom of the fixing sleeve. The guide wheels are arranged inside the mounting shells. A cutting edge for scraping the outer peripheral surface of the guide wheels is arranged at the port of the mounting shell. The guide wheels at both ends of the fixing sleeve are respectively in rolling connection with the inner and outer side walls of the outer ring plate.

[0015] Preferably, the photovoltaic device includes a bottom plate arrayed on the mounting frame. Support plates and electric telescopic rods are respectively hinged at both ends of the bottom plate. The movable end of the electric telescopic rod is hinged to the top end of the support plate. The photovoltaic panel is fixed on the support plate.

[0016] A method for a new type of double-axis tracking photovoltaic power generation system includes the following steps: S1. Use a light detection unit to calculate the sun's trajectory, and calculate the absolute value of the difference in altitude angle and the absolute value of the difference in azimuth angle between the photovoltaic panel and the sun's rays through an altitude angle position sensor and an azimuth angle position sensor; S101. Calculate the declination angle of the sun for each day of the year through the Cooper equation, represented by δ, and the calculation formula is as follows: δ = 23.45sin360×(284 + n) / 365; In the formula: n is the number of days starting from January 1st. On January 1st, n = 1; Then calculate the sun altitude angle and azimuth angle through the calculated declination angle, and the calculation formulas are as follows: sinα = sinφsinδ + cosφcosδcosω; sinβ = cosδsinω / cosα; In the formula: α and β are the altitude angle and azimuth angle respectively; Ф is the local latitude; δ is the sun declination, and the sun declination on the winter solstice is -23.45°; ω is the hour angle, and the hour angle at 9:00 am is -45°; S2. According to the azimuth angle of the sun's rays obtained in step S1, the control unit drives the outer frame assembly to rotate vertically through the driving device to adjust the direction angle of the photovoltaic panel on the frame assembly; S3. According to the altitude angle of the sun's rays obtained in step S1, the control unit controls the photovoltaic panel in the photovoltaic device to rotate horizontally to adjust the pitch angle of the photovoltaic panel so that the photovoltaic panel is perpendicular to the sun's rays.

[0017] The present invention provides a new type of double-axis tracking photovoltaic power generation system and its method, which has the following beneficial effects.

[0018] 1. The light detection component detects the solar altitude angle and azimuth angle. By calculating the solar trajectory, it controls the two-axis rotation of the photovoltaic panel, making the photovoltaic panel always perpendicular to the sunlight, which can make full use of the light radiation, effectively solve the problem of low light energy conversion efficiency caused by the fixed-angle installation of traditional photovoltaic modules, significantly improve the energy utilization rate, and increase the power generation of the system.

[0019] 2. The design of floating on the water surface makes use of the water area space. Compared with the traditional way of occupying a large area of land, it can effectively reduce the occupation of land resources and alleviate the problem of land resource shortage.

[0020] 3. The main floating cylinder and secondary floating cylinder of the support frame system provide buoyancy support. The installation shaft cooperates with the connecting ring, and the rotating support parts are distributed at the bottom of the transition plate and the support ring plate to ensure the stable rotation of the outer frame assembly; the worm of the driving device meshes with the gear ring, and the structures such as the anchor block, cable, fixed sleeve and guide wheel of the limiting device cooperate with each other, making the rotation of the outer frame assembly accurate and stable, and ensuring the reliable operation of the system.

[0021] 4. By calculating the solar trajectory and adjusting the angle of the photovoltaic panel in real time, it can adapt to the changes of the solar altitude angle and azimuth angle at different times of the day and different seasons, adapt to various environmental conditions, and ensure that the system can generate electricity efficiently in different environments.

[0022] 5. The edge of the installation shell port at the guide wheel can scrape off the sundries on the outer peripheral surface of the guide wheel, reduce the failures caused by the influence of sundries, and reduce the maintenance cost and frequency; compared with the problem of easy aging and damage of traditional plastic floating cylinders, the durability of the structural components of this system is better, reducing the maintenance workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the drawings and embodiments: Figure 1 It is a schematic structural diagram of the support frame system in the embodiment of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the mounting frame in the embodiment of the present invention.

[0025] Figure 3 It is a distribution diagram of the photovoltaic panels in the embodiment of the present invention.

[0026] Figure 4 It is a schematic installation structure diagram of the photovoltaic panel in the embodiment of the present invention.

[0027] Figure 5 It is a schematic internal structure diagram of the driving device in the embodiment of the present invention.

[0028] Figure 6 It is a schematic structural diagram of the movable end of the limiting component in the embodiment of the present invention.

[0029] Figure 7 This is a schematic structural diagram of the support rod at the top of the support frame system in the embodiment of the present invention.

[0030] Figure 8 This is the light diagram after the photovoltaic panels are arranged in the embodiment of the present invention.

[0031] In the figure: 1. Support frame system; 11. Main floating barrel; 12. Underframe; 13. Secondary floating barrel; 14. Installation shaft; 15. Connecting ring; 17. Support rod; 18. Support wheel; 2. Limiting device; 21. Anchoring block; 22. Cable; 23. Fixed sleeve; 24. Installation shell; 25. Guide wheel; 3. Outer frame assembly; 31. Outer ring plate; 32. Inner ring plate; 33. Top plate; 34. Ring gear; 35. Vertical rod; 36. Bottom plate; 37. Installation frame; 4. Driving device; 41. Installation platform; 42. Shell; 43. Installation plate; 44. Worm; 45. Clamping wheel; 5. Photovoltaic device; 51. Bottom plate; 52. Support plate; 53. Electric telescopic rod; 54. Photovoltaic panel. Detailed implementation manners

[0032] As Figure 1-8 shown, the present invention provides a novel dual-axis tracking photovoltaic power generation system, including a support frame system 1 floating on the water surface, an outer frame assembly 3 vertically rotatably arranged on the support frame system 1, a photovoltaic device 5 arrayed on the top of the outer frame assembly 3, and a driving device 4 installed on the support frame system 1 to drive the outer frame assembly 3 to rotate. The photovoltaic panel 54 in the photovoltaic device 5 is horizontally rotatably arranged, and a light detection assembly for detecting the solar altitude angle and azimuth angle and transmitting information to the angle adjustment control unit of the photovoltaic panel 54 is arranged on the photovoltaic device 5. The light detection unit includes an ambient illuminance unit, an altitude angle position sensor, and an azimuth angle position sensor.

[0033] The photovoltaic device 5 is carried on the water surface through the support frame system 1, and stable support is provided for the photovoltaic device 5. An anchor cable is arranged at the bottom of the support frame system 1 for fixing the position of the support frame system 1; the outer frame assembly 3 is rotatably arranged on the support frame system 1, and the outer frame assembly 3 is vertically rotationally driven by the driving device 5 installed on the support frame system 1, thereby driving the photovoltaic device 5 on the outer frame assembly 3 to rotate, realizing the adjustment of the phase angle of the photovoltaic panel 54, so that the photovoltaic panel 54 can face the direction of the sun rays. Then, the pitch angle of the photovoltaic panel 54 can be adjusted through the horizontal rotation adjustment unit of the photovoltaic panel 54 in the photovoltaic device 5, so that the sun rays are perpendicular to the photovoltaic panel 54.

[0034] The control unit calculates the altitude angle and azimuth angle of the sun. After obtaining the results, the pitch angle and azimuth angle of the photovoltaic panel 54 are detected according to the altitude angle position sensor and azimuth angle position sensor in the light detection unit, and the detection results are transmitted to the control unit. The control unit adjusts the horizontal rotation and vertical rotation of the photovoltaic panel 54 according to the altitude angle and azimuth angle of the sun. During the adjustment process, the feedback signals from the altitude angle position sensor and azimuth angle position sensor are continuously received for fine-tuning, and finally the sunlight is perpendicular to the photovoltaic panel 54. All the photovoltaic panels 54 are uniformly adjusted by rotating the outer frame assembly 3.

[0035] As Figure 1 and Figure 2 shown, to achieve stable support for the photovoltaic device 5. The support frame system 1 includes a circular chassis 12. A main floating cylinder 11 is connected to the middle of the bottom of the chassis 12, and secondary floating cylinders 13 are uniformly connected to the bottom edge of the chassis 12. A mounting shaft 14 is coaxially and fixedly connected to the chassis 12. A connecting ring 15 is rotatably connected to the mounting shaft 14. The outer frame assembly 3 is coaxially and fixedly mounted on the connecting ring 15. Rotating support members of the outer frame assembly 3 are uniformly arranged on the chassis 12.

[0036] The chassis 12 is circular and is provided with a plurality of radial rods. Multiple loop fixing rings are fixedly installed through the radial rods to ensure the structural strength of the chassis 12. Secondary floating cylinders 13 are installed at each connection node of the chassis 12. The secondary floating cylinders 13 are used for stable support of the edge of the chassis 12. A main floating cylinder 11 is installed at the center of the chassis 12. The mounting shaft 14 is carried on the main floating cylinder 11. The connecting ring 15 that rotates through the mounting shaft 14 is used for fixedly connecting the outer frame assembly 13, thereby realizing the vertical rotation installation of the outer frame assembly 3.

[0037] As Figure 1 、 Figure 5 、 Figure 6 and Figure 7 shown, to ensure the rotational installation of the outer frame assembly 3. The outer frame assembly 3 is annular. The outer frame assembly 3 includes an outer ring plate 31, an inner ring plate 32 coaxially arranged inside the outer ring plate 31, and an annular mounting frame 37 coaxially and fixedly arranged inside the inner ring plate 32. The photovoltaic device 5 is arranged on the mounting frame 37. The outer ring plate 31 and the inner ring plate 32 are connected by a transition plate. At least one support ring plate is coaxially arranged in the middle of the mounting frame 37. The rotating support members are uniformly distributed at the bottoms of the transition plate and the support ring plate.

[0038] The outer ring plate 31 and the inner ring plate 32 are connected by a transition plate. The transition plate includes an annular top plate 33 and a bottom plate 36. Vertical rods 35 are evenly connected between the top plate 33 and the bottom plate 36. The top plate 33 and the bottom plate 36 are connected between the outer ring plate 31 and the inner ring plate 32 to form a stable annular structure. The mounting frame 37 is provided with a support ring plate in the middle. The function of the support ring plate is to increase the structural strength of the mounting frame 37 and provide a support point for the rotating support member. The mounting frame 37 is provided with criss-crossing rods to support the photovoltaic device 5.

[0039] As Figure 7 shown, to ensure the rotational support of the rotating support member for the support ring plate and the transition plate. The rotating support member includes a support rod 17 fixed on the chassis 12 and a support wheel 18 rotatably arranged at the top end of the support rod 17. The outer diameter of the end wall of the support wheel 18 close to the center of the chassis 12 is smaller than that of the other end. The support rod 17 is fixedly installed in an inclined manner, so that the support wheel 18 at the top end of the support rod 17 rotates obliquely. The support wheel 18 adopts a variable-diameter design, so that during the rotation of the mounting frame 37, the support wheel 18 can achieve differential speed through the difference in linear speeds at both ends, ensuring stable horizontal support for the support ring plate and the transition plate.

[0040] As Figure 5 shown, to realize the rotational drive of the outer frame assembly 3. A gear ring 34 is coaxially and fixedly installed on the outer peripheral surface of the outer ring plate 31. The driving device 4 includes a worm 44 driven by a motor to rotate, and the worm 44 meshes with the gear ring 34. By driving the worm 44 to rotate by the motor, the worm 44 drives the gear ring 34 meshing with it to rotate, and then drives the outer frame assembly 3 to rotate vertically.

[0041] As Figure 1 and Figure 5 shown, to ensure the stable meshing of the worm 44 and the gear ring 34. The driving device 4 includes a mounting platform 41 fixed on the chassis 12. A housing 42 is fixed on the mounting platform 41. The worm 44 is rotatably connected in the housing 42. A mounting plate 43 is fixed on the side wall of the housing 42. A clamping wheel 45 is vertically and rotatably connected to the bottom of the mounting plate 43. The clamping wheel 45 is in rolling connection with the inner side wall of the outer ring plate 31. By fixedly installing the mounting plate 43 on one side of the housing 42 and rotatably arranging the clamping wheel 45 on the mounting plate 43, and the relative fixation between the clamping wheel 45 and the worm 44, the middle transition plate part can be effectively limited, ensuring the stable cooperation between the worm 44 and the gear ring 34.

[0042] As Figure 1 and Figure 6As shown in the figure, to ensure the stable rotation of the outer frame assembly 3. The limiting devices 2 are evenly distributed at equal angles around the axis of the chassis 12 and there are no less than three of them. The limiting device 2 includes a fixed anchor block 21 and a fixed sleeve 23 connected to the anchor block 21 by a cable 22. A guide wheel 25 is vertically rotatably arranged at the bottom of the fixed sleeve 23, and the guide wheel 25 is in rolling connection with the inner side wall of the outer ring plate 31.

[0043] By arranging three limiting devices 2, the three limiting devices 2 are evenly distributed on the outside of the outer frame assembly 3. A uniform pulling force is applied to the outer frame assembly 3 through the anchor block 21 and the cable 22 to ensure the stable rotation of the outer frame assembly 3. The cable 22 is connected with the guide wheel 25, converting the sliding friction between the cable 22 and the outer frame assembly 3 into rolling friction to ensure the smooth rotation of the outer frame assembly 3.

[0044] As Figure 6 shown in the figure, to further improve the connection stability between the fixed sleeve 23 and the outer frame assembly 3. Installation shells 24 are fixedly arranged at both ends of the bottom of the fixed sleeve 23. The guide wheel 25 is arranged inside the installation shell 24. A cutting edge for scraping the outer peripheral surface of the guide wheel 25 is arranged at the port of the installation shell 24. The guide wheels 25 at both ends of the fixed sleeve 23 are respectively in rolling connection with the inner and outer side walls of the outer ring plate 31. By adopting a symmetric clamping method, the inner and outer sides of the outer ring plate 31 are respectively clamped by two guide wheels 25 to ensure the connection stability between the fixed sleeve 23 and the outer ring plate 31, and further ensure the stable connection between the cable 22 and the outer frame assembly 23.

[0045] As Figure 4 shown in the figure, to achieve the horizontal rotation of the photovoltaic panel 54. The photovoltaic device 5 includes a bottom plate 51 arrayed on the mounting frame 37. Support plates 52 and electric telescopic rods 53 are respectively hinged at both ends of the bottom plate 51. The movable end of the electric telescopic rod 53 is hinged to the top end of the support plate 52. The photovoltaic panel 54 is fixed on the support plate 52. By controlling the telescopic movement of the electric telescopic rod 53, the angle of the support plate 52 is adjusted, and then the angle of the photovoltaic panel 54 laid and installed on the support plate 52 is adjusted.

[0046] The altitude angle position sensor and the azimuth angle position sensor are both installed on any one of the photovoltaic panels 54 to detect the pitch angle and azimuth angle of the photovoltaic panel 54; all the photovoltaic panels 54 in this photovoltaic power generation system are arranged in the same direction and adjusted in the same form.

[0047] As Figure 1-8 shown. A method for a new type of two-axis tracking photovoltaic power generation system includes the following steps: S1. Use the light detection unit to calculate the sun's trajectory, and calculate the absolute value of the difference in altitude angle and the absolute value of the difference in azimuth angle between the photovoltaic panel 54 and the sun's rays through the altitude angle position sensor and the azimuth angle position sensor; S101. Calculate the declination angle of the sun for each day of the year through the Cooper equation, denoted as δ, and the calculation formula is as follows: δ = 23.45sin360×(284 + n) / 365; In the formula: n is the number of days starting from January 1st, on January 1st, n = 1; Then calculate the altitude angle and azimuth angle of the sun through the calculated declination angle, and the calculation formula is as follows: sinα = sinφsinδ + cosφcosδcosω; sinβ = cosδsinω / cosα; In the formula: α and β are the altitude angle and azimuth angle respectively; Ф is the local latitude; δ is the solar declination, and the solar declination on the winter solstice is -23.45°; ω is the hour angle, and the hour angle at 9:00 am is -45°; S2. According to the azimuth angle of the sun's rays obtained in step S1, the control unit drives the outer frame assembly 3 to rotate vertically through the driving device 4 to adjust the direction angle of the photovoltaic panel 54 on the frame assembly 3; S3. According to the altitude angle of the sun's rays obtained in step S1, the control unit controls the photovoltaic panel 54 in the photovoltaic device 5 to rotate horizontally to adjust the pitch angle of the photovoltaic panel 54 so that the photovoltaic panel 54 is perpendicular to the sun's rays.

[0048] As Figure 8 shown, when laying the photovoltaic panel 54, set the length of the photovoltaic panel 54 as Y, the installation inclination of the photovoltaic panel 54 as Z, and the distance between the vertical projection point at the top of the photovoltaic panel 54 and the bottom end of the rear row of photovoltaic panels 54 as D; For the front and rear row spacing of the photovoltaic panel 54 array, the national standard requires that on the winter solstice day, the spacing of the photovoltaic array should be not less than X, and the best incident angle of the sun's rays is perpendicular to the photovoltaic panel 54. Therefore, the spacing of the photovoltaic panel 54 is: X = Y / cosZ.

[0049] The environmental light unit in the light detection unit is used to judge whether it is a cloudy day. Under cloudy conditions, the altitude angle and azimuth angle of the photovoltaic panel 54 are not adjusted to reduce energy loss.

[0050] When the ambient light unit detects that the light intensity is greater than or equal to a certain threshold, it starts to send a signal to the control unit, starts the solar tracking adjustment of the photovoltaic panel 54, determines the target pitch angle and azimuth angle according to the relationship between the actual solar altitude angle and azimuth angle and the pitch angle and azimuth angle of the photovoltaic panel 54, and then conducts control adjustment. When the light intensity is less than a certain threshold, the tracking adjustment is stopped.

Claims

1. A novel double-axis tracking photovoltaic power generation system, characterized in that: It includes a support frame system (1) floating on the water surface, an outer frame assembly (3) vertically rotatably arranged on the support frame system (1), a photovoltaic device (5) arrayed on the top of the outer frame assembly (3), and a driving device (4) installed on the support frame system (1) to drive the rotation of the outer frame assembly (3). The photovoltaic panels (54) in the photovoltaic device (5) are horizontally rotatably arranged. A light detection assembly for detecting the solar altitude angle and azimuth angle and transmitting information to the angle adjustment control unit of the photovoltaic panels (54) is provided on the photovoltaic device (5). The light detection unit includes an ambient light intensity unit, an altitude angle position sensor, and an azimuth angle position sensor.

2. The novel dual-axis tracking photovoltaic power generation system according to claim 1, wherein: The support frame system (1) includes a circular bottom frame (12). A main floating cylinder (11) is connected to the middle of the bottom of the bottom frame (12). Secondary floating cylinders (13) are evenly connected to the bottom edge of the bottom frame (12). An installation shaft (14) is coaxially and fixedly connected to the bottom frame (12). A connection ring (15) is rotatably connected to the installation shaft (14). The outer frame assembly (3) is coaxially and fixedly mounted on the connection ring (15). Rotating support members of the outer frame assembly (3) are evenly arranged on the bottom frame (12).

3. The novel dual-axis tracking photovoltaic power generation system according to claim 2, characterized in that: The outer frame assembly (3) is annular. The outer frame assembly (3) includes an outer ring plate (31), an inner ring plate (32) coaxially arranged inside the outer ring plate (31), and an annular mounting frame (37) coaxially fixed inside the inner ring plate (32). The photovoltaic device (5) is arranged on the mounting frame (37). The outer ring plate (31) and the inner ring plate (32) are connected by a transition plate. At least one support ring plate is coaxially arranged in the middle of the mounting frame (37). The rotating support members are evenly distributed at the bottoms of the transition plate and the support ring plate.

4. The novel double-axis tracking photovoltaic power generation system according to claim 3, wherein: The rotating support member includes a support rod (17) fixed to the bottom frame (12) and a support wheel (18) rotatably arranged at the top of the support rod (17). The outer diameter of the end wall of the support wheel (18) close to the center of the bottom frame (12) is smaller than that of the other end wall.

5. The novel double-axis tracking photovoltaic power generation system according to claim 3, characterized in that: A gear ring (34) is coaxially and fixedly mounted on the outer peripheral surface of the outer ring plate (31). The driving device (4) includes a worm (44) driven to rotate by a motor. The worm (44) meshes with the gear ring (34).

6. The novel double-axis tracking photovoltaic power generation system according to claim 5, wherein: The driving device (4) includes a mounting platform (41) fixed to the bottom frame (12). A housing (42) is fixed on the mounting platform (41). The worm (44) is rotatably connected in the housing (42). A mounting plate (43) is fixed to the side wall of the housing (42). A clamping wheel (45) is vertically rotatably connected to the bottom of the mounting plate (43). The clamping wheel (45) is in rolling connection with the inner side wall of the outer ring plate (31).

7. The novel dual-axis tracking photovoltaic power generation system according to claim 3, characterized in that: The limiting devices (2) are equally angularly distributed around the axis of the bottom frame (12) and there are no less than three. The limiting device (2) includes a fixed anchor block (21) and a fixed sleeve (23) connected to the anchor block (21) by a cable (22). A guide wheel (25) is vertically rotatably arranged at the bottom of the fixed sleeve (23). The guide wheel (25) is in rolling connection with the inner side wall of the outer ring plate (31).

8. The novel double-axis tracking photovoltaic power generation system according to claim 7, wherein: At both ends of the bottom of the fixed sleeve (23), mounting shells (24) are fixedly arranged. The guide wheels (25) are arranged inside the mounting shells (24). At the ports of the mounting shells (24), there are cutting edges for scraping the outer peripheral surface of the guide wheels (25). The guide wheels (25) at both ends of the fixed sleeve (23) are respectively in rolling connection with the inner and outer side walls of the outer ring plate (31).

9. The novel double-axis tracking photovoltaic power generation system according to claim 3, characterized in that: The photovoltaic device (5) includes a bottom plate (51) arrayed on the mounting frame (37). At both ends of the bottom plate (51), a support plate (52) and an electric telescopic rod (53) are respectively hinged. The movable end of the electric telescopic rod (53) is hinged to the top end of the support plate (52). The photovoltaic panel (54) is fixed on the support plate (52).

10. The method of a novel dual-axis tracking photovoltaic power generation system according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Use the light detection unit to calculate the sun's trajectory, and calculate the absolute value of the difference in altitude angle and the absolute value of the difference in azimuth angle between the photovoltaic panel (54) and the sun's rays through the altitude angle position sensor and the azimuth angle position sensor; S101. Calculate the declination angle of the sun for each day of the year through the Cooper equation, represented by δ, and the calculation formula is as follows: δ = 23.45sin360×(284 + n) / 365; In the formula: n is the number of days starting from January 1st. On January 1st, n = 1; Then calculate the altitude angle and azimuth angle of the sun through the calculated declination angle, and the calculation formula is as follows: sinα = sinφsinδ + cosφcosδcosω; sinβ = cosδsinω / cosα; In the formula: α and β are the altitude angle and azimuth angle respectively; Ф is the local latitude; δ is the sun's declination, and the sun's declination on the winter solstice is -23.45°; ω is the hour angle, and the hour angle at 9:00 am is -45°; S2. According to the azimuth angle of the sun's rays obtained in step S1, the control unit drives the outer frame assembly (3) to rotate vertically through the driving device (4) to adjust the direction angle of the photovoltaic panel (54) on the frame assembly (3); S3. According to the altitude angle of the sun's rays obtained in step S1, the control unit controls the photovoltaic panel (54) in the photovoltaic device (5) to rotate horizontally to adjust the pitch angle of the photovoltaic panel (54) so that the photovoltaic panel (54) is perpendicular to the sun's rays.

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