Wind-following flexible photovoltaic support system

Abstract

The utility model provides a flexible photovoltaic support system capable of floating following wind, which comprises a high-rise support and a plurality of photovoltaic power generation panels hung on a bearing cable, and the plurality of photovoltaic power generation panels are connected in series to form a dynamic photovoltaic string capable of floating following wind. An existing flexible photovoltaic support scheme that a plurality of cables are used for building a stable structure is abandoned, an innovative design that one bearing cable is used, resistance is reduced along with wind, stability is not maintained and the like is adopted, investment of a photovoltaic power generation system is reduced, and low-cost agriculture and light complementation and other applications are achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of agricultural light complementation, forest light complementation, pasture light complementation, fishery light complementation, etc., and specifically relates to a wind-following flexible photovoltaic support system. BACKGROUND

[0002] The prior application of the applicant, "Farmland High-altitude Photovoltaic Power Generation Method and Photovoltaic Power Generation Suspension Cable (CN117792235B)", authorizes a method for generating photovoltaic power on farmland at high altitude and a photovoltaic power generation suspension cable. It lays a photovoltaic cell layer around a high-tensile-strength load-bearing cable to encapsulate a photovoltaic power generation suspension cable-linear photovoltaic cell assembly-and erects the photovoltaic power generation suspension cable to the space above the farmland through a high-rise support, thereby absorbing the surplus solar energy in the high altitude to generate power, and also irrigating the farmland, achieving the complementary development of agricultural production and photovoltaic power generation-agricultural light complementation. It has a large span and few pile foundations, and can avoid serious interference with agricultural machinery operation. It overcomes the technical defects of the background technology, such as the large wind resistance, high stability cost, large power generation fluctuation, difficulty in high-altitude erection, high installation cost, difficulty in cleaning and maintenance, short service life, and insufficient and ineffective exploitation of the surplus solar energy resources in the space above the farmland of the flexible support photovoltaic power station scheme in "A Large-span Flexible Support Photovoltaic Power Station Desertification Control System (CN219812768U)" and the like.

[0003] However, it is found in the implementation of production that the flexible thin-film photovoltaic cells such as perovskite for encapsulating linear photovoltaic cell assemblies have not yet formed a scale effect, and their market price (about 1.65-3.5 yuan / watt) is difficult to drop to the price level (about 0.7 yuan / watt) of monocrystalline silicon photovoltaic cell panels in the next three to five years, so the investment in the photovoltaic power generation system will still be high in recent years. SUMMARY

[0004] The purpose of the present application is to provide a wind-following flexible photovoltaic support system to reduce system investment by reducing wind resistance through wind-following design, and to realize low-cost application by using current monocrystalline silicon photovoltaic cell panels and other inexpensive planar cell panels.

[0005] In order to achieve the above-mentioned purpose of the application, the wind-following flexible photovoltaic support system provided by the present application is as follows.

[0006] The wind-following flexible photovoltaic support system provided by the present application is characterized in that it comprises:

[0007] ① A photovoltaic cell assembly in the shape of a plate-a photovoltaic power generation panel (including a flexible photovoltaic power generation panel or a flexible photovoltaic power generation film or a flexible photovoltaic power generation cloth); preferably, the width D of the photovoltaic power generation panel is ≤1280 mm, and the length C of the photovoltaic power generation panel is ≤2688 mm;

[0008] ②High-rise support and a plurality of photovoltaic panels hanging on a load-bearing cable (including other erection methods equivalent to hanging), the plurality of photovoltaic panels are connected in series to form a (dynamic) photovoltaic string that can be adjusted in posture (around the load-bearing cable) according to the wind; the plurality of photovoltaic panels are connected in series to form a photovoltaic string that can be blown by the wind; the height of the photovoltaic string from the ground is H≥3m, the span of a single span of the photovoltaic string is L≥20m, and the horizontal projection distance of the photovoltaic string is K≥0.2m;

[0009] ③The shadow of the photovoltaic string projected on the ground, including horizontal projection; wherein the ratio of the width D of the photovoltaic panel to the horizontal projection distance K of the photovoltaic string, the shading coefficient D / K≤3;

[0010] ④The working space below the photovoltaic string can be normally cultivated, or / and the plants and animals can normally absorb sunlight.

[0011] Preferably, D≤235mm or 322mm or 420mm or 1140mm or 1280mm or 2680mm; the optimal width D is 100mm to 300mm, because the shadow of the photovoltaic panel with this width on the ground is narrow, the time of crossing the crops is short, and the sunlight can be evenly distributed to all crops, without affecting normal photosynthesis.

[0012] Preferably, the height H of the photovoltaic string is≥4m or 5m or 10m or 20m or 30m or 50m or 100m or other set size, to ensure that the highest crop top will not touch the photovoltaic string, preferably H≥4.2m, to ensure that large agricultural machinery and unmanned aerial vehicles can work without being hindered; L≥50m or 80m or 150m or 500m, so that the span L is large enough to reduce the number of high-rise support poles, reduce the pile foundation area, and avoid serious hindering of large agricultural machinery, preferably L≥120m, for super-span application; K≥0.5m or 1m or 2m or 3m or 5m or 10m, to appropriately reduce the shadow area of the photovoltaic string, to ensure the minimum light needs of crop growth, and to avoid reduced yield due to insufficient photosynthesis.

[0013] More preferably, the height H of the photovoltaic string is greater than the set size, and the shading coefficient D / K is≤0.01 or 0.02 or 0.03 or 0.05 or 0.1 or 0.2 or 0.3 or 0.5 or 1 or 2 or other set coefficient value, to ensure that each noon shadow of the photovoltaic string moves a distance of 1D every 1-20 minutes (preferably every 1-5 minutes); the same shadow stays on (i.e. crosses) the same plant (i.e. stays in the same position) for no more than 30 minutes (as much as possible), so as not to cause the photosynthesis of the plant (i.e. in the same position) to be weakened and the yield to be reduced. In order to unify the detection standard, the noon shadow here is defined as the shadow of the sun on the ground when the sun is at noon (i.e. from 11am to 1pm).

[0014] Research shows that H≥3m, D≤460mm, D / K≤0.25, the crops need sunlight every 20 minutes will be blocked 3-5 minutes, so constantly blocked, open, block again, open again. In this way, the crops will absorb an average of 13-20% less sunlight. One group of data shows that the reduction of 13% (equivalent to D / K≤0.15) of sunlight has no effect on photosynthesis and yield of crops; another group of data shows that the reduction of more than 20% (equivalent to D / K≥0.25) of sunlight begins to have some effect on photosynthesis and yield of crops. Therefore, H≥3m, D≤460mm (235mm is best), D / K≤0.25, every noon shadow every 1-20 minutes to move 1D distance, is the golden ratio of crop photosynthesis without harm, has universal value; under this condition, the photovoltaic string blocks the sunlight, which is equivalent to the blocking effect of glass with a light transmittance of 80-87%. As can be seen, the application of opaque photovoltaic string combined with the design and application of shading coefficient D / K achieves the technical effect of semi-transparent photovoltaic cell panel, and realizes the purpose of exploiting the surplus solar energy resources in the upper space.

[0015] Research shows that the length of time the shadow stays on the same crop is also inversely proportional to H and proportional to D. Take Xinying District, Haikou City, for example. The shadow moving speed of the photovoltaic string with a height of 50 meters in the north-south direction at noon (11 o'clock) on March 4th is 68 cm / minute; if the height H of the photovoltaic string is reduced to 4.6 meters, the shadow moving speed will be reduced to 2.5 cm / minute, and if the height H of the photovoltaic string is reduced to 1.2 meters, the shadow moving speed will be reduced to 0.6 cm / minute. Again, on March 4th at noon (1:30 pm), the height H of the photovoltaic string is reduced to 5 meters, and the shadow moving speed will be reduced to 1.3 cm / minute. Comparative observation at the same period shows that the shadow (southward) of the photovoltaic string with a height of 5 meters in the east-west direction moves at a speed of only 0.33 mm / minute, which is too slow, and in specific implementation, it is advisable to avoid erecting relatively wide photovoltaic strings in the east-west direction and to erect them in the north-south direction as much as possible. As can be seen, in order to reduce the impact of slow shadow movement on crop growth, the hanging height H of the photovoltaic string should be increased as much as possible. Given that the height H is 1 meter, the shadow stays on the crops for a long time, which will seriously affect crop growth, so it is not recommended to use such a low height H; of course, in order to reduce the impact of slow shadow movement on crop growth, the width D of the photovoltaic string should also be reduced as much as possible.

[0016] In summary, in practice, the height H is preferably greater than 3m, and more preferably greater than 4.2m; the width D is preferably less than 0.460m; the horizontal projection distance K is preferably greater than 0.5m, and more preferably greater than 1m; and D / K≤0.25, and more preferably D / K≤0.15.

[0017] In practice, the shading coefficient D / K is selected according to the type of crop in the farmland. For crops that require shading nets to adjust the light level, and for forest land that does not care about yield, such as leafy crops like lettuce, spinach, cabbage, mustard, celery, green forest, grassland, etc., the shading coefficient D / K can be appropriately increased, the distance K can be reduced, and the width D can be increased.

[0018] Preferably, the wind-borne flexible photovoltaic support system is characterized by: D≤235mm or 322mm or 420mm or 1140mm or 1280mm or 2688mm, C≤808mm or 1208mm, H≥4m or 5m or 10m or 20m or 30m or 50m or 100m, L≥50m or 80m or 150m or 500m, K≥0.5m or 1m or 2m or 3m or 5m or 10m, D / K≤0.02 or 0.03 or 0.05 or 0.1 or 0.2 or 0.3 or 0.5 or 1 or 2.

[0019] Further preferably, the wind-borne flexible photovoltaic support system is characterized by: both the front and back of the photovoltaic string can generate electricity (receive light), and the photovoltaic string is erected along the north-south direction, which includes all directions with an angle less than 39° with the meridian; or, the adjacent two photovoltaic panels that make up the photovoltaic string are spaced apart by a gap S of 0.2C or more or 0.5C or more or 1C or more (to form intermittent shadows), and the photovoltaic string is preferably erected along the east-west direction, which includes all directions with an angle less than 39° with the parallel, so that the moving speed of the (intermittent) shadows from west to east is increased, the moving speed of the shadows from south to north is reduced, the shadows quickly move away from the same crop, the impact on the photosynthesis of the crop is reduced, and the density of the photovoltaic panels is reduced to increase the single-span span of the photovoltaic string.

[0020] Further preferably, the wind-borne flexible photovoltaic support system is characterized by: the existing stabilizing cable in the flexible photovoltaic support can be used to further fix the photovoltaic panel to face a predetermined direction, thereby stabilizing the light receiving area and improving the power generation efficiency.

[0021] It is also preferred that the wind-driven flexible photovoltaic support system is characterized in that: each photovoltaic panel of the photovoltaic string is hung on the same load-bearing cable without linkage and fixation with each other, and each can be wind-driven; the wind-driven of one photovoltaic panel will not pull another photovoltaic panel to be wind-driven synchronously, that is, each can be wind-driven independently without linkage, but only asynchronous wind-driven, so as to avoid resonance damage. In this way, after a plurality of photovoltaic panels are connected in parallel or in series, the (asynchronous) current of the up-and-down will be mutually peak clipping, forming a relatively stable output pulse (direct current) current.

[0022] It is also preferred that the wind-driven flexible photovoltaic support system is characterized in that: each photovoltaic panel of the photovoltaic string is pulled on the damping cable by a damping elastic rope, which is used to reduce vibration and prevent the wind-driven angle of the photovoltaic panel from exceeding the set value and keep the photovoltaic panel at a set angle in the absence of wind, prevent (violent) vibration and the wind-driven angle of the photovoltaic panel from exceeding the set value (for example, within 90 degrees clockwise and within 90 degrees counterclockwise), avoid the photovoltaic panel (like a fan) rotating more than 360 degrees and damaging the photovoltaic panel, and keep the photovoltaic panel at the (optimal) set angle in the absence of wind. In this way, the damping elastic rope can absorb the kinetic energy of the photovoltaic panel, prevent the photovoltaic panel from violent vibration, limit the wind-driven angle of the photovoltaic panel, avoid violent wind-driven damage to the photovoltaic panel, and prevent the cell from cracking.

[0023] It is also preferred that the wind-driven flexible photovoltaic support system is characterized in that: the angle between the damping cable and the load-bearing cable is equal to (including similar) the local latitude, with a positive or negative deviation of not more than 15 degrees; or, the angle of the photovoltaic panel is equal to the local latitude, with a positive or negative deviation of not more than 15 degrees; or, the left and right adjacent two load-bearing cables are used as damping cables (used), and each photovoltaic panel of the photovoltaic string is pulled on the left and right two (used as damping cables) load-bearing cables by a damping elastic rope, to prevent the wind-driven angle of the photovoltaic panel from exceeding the set value.

[0024] It is also preferred that the wind-driven flexible photovoltaic support system is characterized in that: the photovoltaic string is hung in the air above the street or roadside, and an advertisement picture such as a flag picture is attached to the front or back of the photovoltaic panel to form a kind of flag that can set off the atmosphere of (festival or major event). In this way, the flag that decorates the atmosphere of the festival or major event can be combined with photovoltaic power generation, share the space, cooperate and complement each other, and save the cost of both; or, the plants and animals located on the ground below the photovoltaic string have normal operation space for cultivation or normal sunlight absorption.

[0025] It is also preferred that the wind-driven flexible photovoltaic support system is characterized in that: the plants and animals located below the photovoltaic string have normal operation space for cultivation or normal sunlight absorption.

[0026] It is also preferred that the wind-surfing flexible photovoltaic support system is characterized in that: the upper end of the photovoltaic power generation panel is hung on the load cable, and the photovoltaic power generation panel naturally droops (preferably the inclination angle φ of the photovoltaic power generation panel is about equal to the latitude of the place) in the absence of wind, and the photovoltaic power generation panel can be rotated around the load cable or swing left and right in the wind.

[0027] In order to simplify the structure and reduce the application cost, each photovoltaic power generation panel can be allowed to rotate 360° in the wind, thereby eliminating the need for damping elastic ropes and damping cables. Most preferably, each photovoltaic power generation panel in the same photovoltaic string is connected into a parallel circuit or / and a series circuit through a conductive slip ring; preferably, each photovoltaic power generation panel is hung on the load cable through a special hanging part such as a conductive slip ring, allowing each photovoltaic power generation panel to rotate around the load cable (for example, 360°) in the wind. In order to prevent collisions between adjacent photovoltaic power generation panels in the wind, it is preferable to increase the spacing of the photovoltaic string, so that K > 2D.

[0028] The load cable described in the present application refers to a linear object that can support the photovoltaic power generation panel through tensioning, including ropes, steel cables, chains, linear objects connected by multiple rod bodies or pipe bodies or profiles, etc.

[0029] Compared with the prior art, the present application has the following beneficial technical effects.

[0030] First, the cost is low: it has all ten beneficial technical effects of the prior application "Farmland High-altitude Photovoltaic Power Generation Method and Photovoltaic Power Generation Suspension Cable (CN117792235B)", and the cost is low. This is because the present application uses a cheap flat cell panel such as a monocrystalline silicon photovoltaic cell panel of the current standard specification (instead of an expensive flexible thin-film cell), also achieves agricultural photovoltaic complementary application, and greatly reduces the cost of the power generation system.

[0031] Second, small wind resistance and large span: compared with the flexible support photovoltaic power station scheme mentioned in the background art "A Large-span Flexible Support Photovoltaic Power Station System for Desertification Control (CN219812768U)", the present application abandons the traditional concept that the cell panel must be stabilized, and first proposes the technical route that the cell panel can be used in a floating manner, without the need for multiple cables to build a stable structure, and uses a load cable, wind resistance reduction, and other innovative designs (i.e. innovative designs that allow the photovoltaic power generation panel to float in the wind and keep the windward surface with the smallest area and the smallest wind resistance), also achieving agricultural photovoltaic complementary application. Because the wind resistance is small, the span can be made very large. Wind tunnel tests show that under the same wind conditions, the span can be expanded by more than 3 times. Although the power generation efficiency of the photovoltaic power generation panel naturally droops (i.e. the inclination angle φ is zero) is reduced, the total investment and the cost of electricity of the power generation system are greatly reduced.

[0032] Thirdly, it will not resonate damage: in this application, each photovoltaic panel that constitutes a photovoltaic string is not linked and fixed with each other, and each photovoltaic panel can be individually blown by the wind; The blowing of a photovoltaic panel will not pull another photovoltaic panel to blow synchronously, that is, it will not be linked and damaged by resonance. The background technology "A desertification control system for large-span flexible support photovoltaic power station (CN219812768U)" and other existing flexible support photovoltaic power station solutions, each photovoltaic panel is linked and fixed with each other, and the shaking of a photovoltaic panel will inevitably pull another photovoltaic panel to link and resonate with it, thereby being difficult to resist strong winds and being prone to damage. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 An application diagram of the wind-borne flexible photovoltaic support system of the present application (Example One) on farmland.

[0034] Figure 2 A horizontal projection cross-sectional structure diagram of the photovoltaic string in the present application (Example One). Figure 1

[0035] A structure diagram of a section of a photovoltaic string in the present application (Example One). Figure 3 Figure 1 A structure diagram of a section of a photovoltaic string in the present application (Example Two) being pulled by a damping elastic rope.

[0036] Figure 4 A structure diagram of another section of a photovoltaic string in the present application (Example Three).

[0037] Figure 5 A structure diagram of a section of a photovoltaic string hung in series by a conductive slip ring in the present application (Example Four).

[0038] Figure 6 A longitudinal cross-sectional structure diagram of a certain place in the present application (Example Five).

[0039] Figure 7 Figure 6 A certain geometric shape of a photovoltaic panel string that looks more like a current flag.

[0040] Figure 8 A structure diagram of a photovoltaic panel being pulled by a damping elastic rope in the present application (Example Five).

[0041] Figure 9 A structure diagram of a photovoltaic panel being pulled by a damping elastic rope in the present application (Example Five).

[0042] Figure 10 A structure diagram of a photovoltaic panel being pulled by a damping elastic rope in the present application (Example Five).

[0043] Figure 11 ​​Another structure schematic diagram of one photovoltaic panel being pulled by damping elastic ropes in the application (embodiment five).

[0044] Figure 12 For Figure 3 Another structure schematic diagram of one photovoltaic panel being pulled by damping elastic ropes in the application (embodiment five).

[0045] Figure 13 Another structure schematic diagram of one photovoltaic panel being pulled by damping elastic ropes in the application (embodiment five).

[0046] Figure 14 For Figure 6 Another structure schematic diagram of one photovoltaic panel being pulled by damping elastic ropes in the application (embodiment five).

[0047] Figure 15 Another structure schematic diagram of one photovoltaic panel being pulled by damping elastic ropes in the application (embodiment five).

[0048] Figure 16 Another structure schematic diagram of one photovoltaic panel being pulled by damping elastic ropes in the application (embodiment five).

[0049] BRIEF DESCRIPTION OF DRAWINGS 1-photovoltaic string, 2-bearing cable, 3-photovoltaic panel, 4-farm machine, 5-damping elastic rope, 6-tall support pole, 601-support beam (or support cable), 7-crop, 8-farmland, 9-shade, 10-sun, 11-sunlight (light), 12-connection wire, 13-hanging piece, 14-damping cable, 15-bunting (layer), 16-linkage, 17-conductive slip ring, 1701-slip ring stator, 1702-slip ring rotor, 1703-insulating ring. DETAILED DESCRIPTION

[0050] In order to make the technical means, creative features, purposes and effects achieved by the application easy to understand, the application is further described below in combination with specific embodiments.

[0051] In the description of the application, it should be noted that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. It should be noted that for the purpose of description, the length direction of the photovoltaic string is defined as the longitudinal direction, and the direction perpendicular thereto is defined as the transverse direction or left and right.

[0052] It should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connecting", "communicating" and the like, should be construed broadly and, for example, "communicating" can be electrical communication, and can also be direct connection. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0053] Embodiment one.

[0054] As shown in Figure 1 , Figure 2 , Figure 3 In the high altitude of a piece of farmland 8 (such as a wheat field or a vegetable field or a corn field or an orchard), along the east-west direction

[0055] Hang hundreds of photovoltaic strings 1 at a distance of 3-15 meters from the ground, with a spacing of 3-10 meters.

[0056] First, purchase some photovoltaic panels 3 with a width of 1134mm and a length of 2384mm.

[0057] Second, hang a piece of photovoltaic panel 3 on a load-bearing cable 2 with a circular ring, hinge, etc. hanging piece 13, and connect them with connecting wires 12, that is, a photovoltaic string 1. It is best to choose a load-bearing cable 2 with a tensile strength greater than 1200MPa, such as φ15.2x3 galvanized prestressed steel strand, high-strength fiber rope, carbon fiber cable, aramid cable, glass fiber cable, steel wire rope, lightweight pipe, etc.

[0058] Third, hang the many photovoltaic strings 1 thus made in the air above the farmland 8 through high-rise support poles 6 about 15 meters high, like hanging a flag. The height H of the lower end of the photovoltaic string 1 from the top of the crop 7 (for example, a coconut tree) can be set to about 14 meters, the span L of a single span of the photovoltaic string 1 can be set to 120-500 meters, and the distance K between the horizontal projections of the photovoltaic strings 1 (between two adjacent strings on the farmland 8) is preferably 3-10 meters. For example, H can be ≥5m or 10m or 20m or 30m or 50m, in general, the cable height H should be high enough to ensure that the top of the crop 7 does not touch the photovoltaic string 1. L can also be ≥10m or 20m or 50m or 100m or 500m, in general, the span L should be large enough to reduce the number of high-rise support poles 6, reduce the pile foundation area, and avoid serious interference with the operation of large agricultural machinery 4. It is best to make K ≥ 3m or 5m or 10m, in general, the width of the photovoltaic string 1 (and) shadow 9 should be appropriately reduced, the light requirement for crop 7 growth should be minimally guaranteed, and yield reduction due to insufficient photosynthesis should be avoided.

[0059] In order to reduce the number of pile foundations, save land area, and also to ensure that the photovoltaic string 1 can be erected along the north-south direction, in the specific implementation, the support cross beam 601 in the high-rise support pole 6 can also not use a rigid cross beam, but a flexible cross beam (i.e., a support cross cable), such as a very thick steel cable main cable (not shown in the figure).

[0060] It should be noted that in the specific implementation, the width D of the photovoltaic string 1 (i.e., the photovoltaic panel 3) should be appropriately reduced, and the spacing of the photovoltaic string 1 should be appropriately increased, so that the ratio of the width D of the photovoltaic string 1 to the spacing K of the horizontal projection of the photovoltaic string 1 (on the farmland 8) is: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.20 or 0.30 or 1 or 2 or 3, so that the shadow 9 of the same photovoltaic string 1 quickly (for example, within 5 minutes) moves across the same plant 7 as the sun 10 moves, so as to avoid the same plant 7 staying in the shadow 9 of the same photovoltaic string 1 for a long time (for example, more than 30 minutes) to reduce photosynthesis and cause the plant 7 to reduce yield. Research has found that the length of time that the shadow 9 stays on the same plant 7 is inversely proportional to H and proportional to D. As can be seen, in order to reduce the impact of the shadow on the growth of the plant, the hanging height H of the photovoltaic string 1 should be as high as possible, and the width D of the photovoltaic string 1 should be as small as possible. Preferably, H is selected to be 3-30m, and the width D is selected to be 420-1134mm.

[0061] Most preferably, the adjacent two photovoltaic panels 3 that make up the photovoltaic string 1 are spaced apart by a spacing distance S of 0.2C or more or 0.5C or more or 1C or more, rather than being continuously hung without spacing or with small spacing, and the photovoltaic string 1 is erected along the east-west direction, which includes all directions with an angle of less than 39° with the latitude line; preferably, C≤320mm or 460mm or 808mm or 1200mm, and D≤120mm or 235mm or 460mm. In this way, the moving speed of the (intermittent) shadow 9 from west to east can be increased, the moving speed of the shadow 9 from south to north can be prevented from being too slow, the shadow 9 can be quickly moved away from the same plant 8, and the impact on the photosynthesis of the plant 8 can be reduced. In addition, the density of the photovoltaic panel 3 can also be reduced to increase the single-span span L of the photovoltaic string 1.

[0062] It is also preferable that each photovoltaic panel 3 constituting the photovoltaic string 1 is not linked and fixed with each other, and each photovoltaic panel 3 can be individually blown by the wind; the blowing of one photovoltaic panel 3 will not pull another photovoltaic panel 3 to blow synchronously, that is, will not be linked and resonated to be damaged. The prior art "A desertification control system of a large-span flexible support photovoltaic power station (CN219812768U)" and other flexible support photovoltaic power station schemes link and fix each photovoltaic panel 3 with each other, and the shaking of one photovoltaic panel 3 will inevitably pull another photovoltaic panel 3 to link and resonate, so as to be difficult to resist strong wind and easy to be damaged. Figure 12 、 Figure 13 are two undesirable linkage design diagrams in which two adjacent photovoltaic panels 3 are connected by a linkage 16. In other words, the linkage scheme shown in Figure 12 、 Figure 13 cannot be adopted.

[0063] Example Two.

[0064] As shown in Figure 4 , on the basis of the above example, a φ12×3 galvanized prestressed steel cable is further erected below the photovoltaic panel 3 and used as a damping cable 14; and a damping elastic rope 5 such as a spring is used to pull each photovoltaic panel 3 to the damping cable 14, and they are connected in series by a connecting wire 12. In this way, it can be prevented that the blowing angle of the photovoltaic panel 3 exceeds the set value, for example, the clockwise angle exceeds 90 degrees and the counterclockwise angle exceeds 90 degrees, so as to avoid the photovoltaic panel 3 (like a fan) rotating more than 360 degrees and being damaged. In this way, the damping elastic rope 5 can absorb the kinetic energy of the photovoltaic panel 3, prevent the photovoltaic panel 3 from blowing violently, limit the blowing angle of the photovoltaic panel 3, avoid the photovoltaic panel 3 from being damaged due to violent blowing, and prevent the cell from being cracked.

[0065] Example Three.

[0066] As shown in Figure 5 , referring to the above example one, each photovoltaic panel 3 is hung by a triangular frame type hanging piece 13 made of steel bars on a load-bearing cable 2 running east-west, so that the photovoltaic panel 3 maintains an (optimal) inclination angle φ similar to the local latitude with the horizontal plane, and they are connected in series by a connecting wire 12, that is, a photovoltaic string 1. In this way, the sunlight 11 can be perpendicular to the photovoltaic panel 3, so as to maximize the power generation efficiency.

[0067] Example Four.

[0068] As shown in Figure 6 、 Figure 7As shown, based on examples one, two, and three above, colorful banners (including advertising banners) 15 are attached to the front or back of each photovoltaic panel 3 to create a festive atmosphere. Each photovoltaic panel 3 in the photovoltaic string 1 is suspended from the load-bearing cable 2 via special hanging devices 13 such as conductive slip rings 17, and connected in series. To simplify the structure and reduce application costs, each photovoltaic panel 3 can be allowed to rotate 360° around the load-bearing cable 2 in the wind. Figure 14 This is a schematic diagram of the cross-sectional structure of a conductive slip ring 17. Figure 15 This is a schematic diagram of a commercially available 360° rotatable conductive slip ring 17. The conductive slip ring 17 is a commercially available, mature electrical connector, also known as a brush slip ring or rotary electrical connector. It is a device capable of transmitting power and signals between rotating and stationary equipment. It is widely used in many applications requiring rotational motion and simultaneous electrical connection, such as wind turbines, robots, radar antennas, medical equipment, and engineering machinery. For its specific structure, installation, and usage methods, please refer to the utility model patent "A Wear-Resistant Through-Hole Conductive Slip Ring (CN214589607U)," which will not be elaborated upon here.

[0069] like Figure 16 As shown, the conductive slip ring 17 can also be installed at one-third of the position of the photovoltaic panel 3 (upper middle part), so that the center of gravity of the photovoltaic panel 3 is as close as possible to the load-bearing cable 2, so that the photovoltaic panel 3 can maintain the optimal tilt angle φ when there is no wind by using a lighter counterweight or a smaller pulling force; this method of installing the upper middle part of the photovoltaic panel 3 on the load-bearing cable 2 makes it easier for the photovoltaic panel 3 to adjust its posture with the wind around the load-bearing cable 2.

[0070] like Figure 8 As shown, the photovoltaic panels 3 can also be shaped into various geometric shapes that resemble colorful flags. In this way, colorful flags used to decorate festivals or major events can be integrated with photovoltaic power generation, sharing space, complementing each other, and saving costs for both.

[0071] Example 5.

[0072] It is advisable, such as Figure 9 As shown, the damping cable 14 is positioned below and to the side of the load-bearing cable 2, ensuring that the tilt angle φ of the line connecting the damping cable 14 and the load-bearing cable 2 is equal to the local latitude, with a positive or negative deviation of no more than 8 degrees. In this way, when there is no wind, the photovoltaic panel 3 maintains the optimal tilt angle φ, thereby maximizing the absorption of solar energy.

[0073] More preferably, such as Figure 10 , Figure 11As shown, two adjacent load-bearing cables 2 on the left and right are used as damping cables 14, and each photovoltaic panel 3 of the photovoltaic string 1 is pulled on the two load-bearing cables 2 (used as damping cables 14) by a damping elastic rope 5, so as to alleviate the degree of severe floating and prevent the floating angle of the photovoltaic panel 3 from exceeding the set value. In this way, one damping cable 14 can be saved, thereby further reducing the cost of the power generation system.

[0074] The above disclosure is only a preferred embodiment of the present application, the drawings are only structural schematic diagrams, not drawn according to the actual size ratio, and cannot be used to limit the scope of the present application. Equivalent changes made based on the claims of the present application still belong to the scope covered by the present application.

Claims

1. A downwind flexible photovoltaic racking system characterized in that it Comprise: ① Plate-shaped photovoltaic cell assembly - photovoltaic power generation plate; ② High support and a plurality of photovoltaic power generation plates hanging on a bearing cable, the plurality of photovoltaic power generation plates are connected by the bearing cable into a wind-tilting photovoltaic string; the height of the photovoltaic string from the ground is H≥3m, the single-span span of the photovoltaic string is L≥20m, and the horizontal projection spacing of the photovoltaic string is K≥0.2m; ③ The shadow of the photovoltaic string projected on the ground, including horizontal projection; wherein the ratio of the width D of the photovoltaic power generation plate to the horizontal projection spacing K of the photovoltaic string - the shading coefficient D / K≤3.

2. The windborne flexible photovoltaic mount system of claim 1, wherein: D≤235mm or 322mm or 420mm or 1140mm or 1280mm, C≤808mm or 1280mm or 2688mm, H≥4m or 5m or 10m or 20m or 30m or 50m or 100m, L≥50m or 80m or 150m or 500m, K≥0.5m or 1m or 2m or 3m or 5m or 10m, D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.1 or 0.2 or 0.3 or 0.5 or 1 or 2.

3. The windborne flexible photovoltaic mount system of claim 2, wherein: The front and back of the photovoltaic string can generate electricity, and the photovoltaic string is erected along the north-south direction, which includes all directions with an angle less than 39° with the meridian; or, the adjacent two photovoltaic power generation plates constituting the photovoltaic string are spaced apart by a spacing distance S of more than 0.2C or more than 0.5C or more than 1C; or, the inclination angle of the photovoltaic power generation plate is equal to the latitude of the place, and the positive and negative deviations are not more than 15°.

4. The windborne flexible photovoltaic mount system of claim 2, wherein: Each noon shadow of the photovoltaic string moves a distance of 1D per 1-20 minutes.

5. The kite flexible photovoltaic support system according to claim 1 or 2 or 3 or 4, characterized in that: Each photovoltaic power generation plate constituting the photovoltaic string is hung on the same bearing cable and is not fixed with each other, and can be wind-tilted.

6. The kite flexible photovoltaic support system according to claim 1 or 2 or 3 or 4, characterized in that: Each photovoltaic power generation plate constituting the photovoltaic string is pulled on the damping cable by the damping elastic rope, which is used for damping and preventing the photovoltaic power generation plate from tilting more than a set value and keeping the photovoltaic power generation plate at a set inclination angle when there is no wind.

7. The windborne flexible photovoltaic mount system of claim 6, wherein: The connecting line between the damping cable and the bearing cable has an inclination angle equal to the latitude of the place, and the positive and negative deviations are not more than 15 degrees; or, the left and right adjacent two bearing cables are used as damping cables, and each photovoltaic power generation plate constituting the photovoltaic string is pulled on the left and right two bearing cables by the damping elastic rope to prevent the photovoltaic power generation plate from tilting more than a set value.

8. The kite flexible photovoltaic support system according to claim 1 or 2 or 3 or 4, characterized in that: The photovoltaic string is hung in the air above the street or the roadside, and a color flag picture is attached to the front or / and back of the photovoltaic power generation plate to form a color flag that can set off the atmosphere; or, the ground surface below the photovoltaic string has a normal operation space for cultivation or / and a normal sunlight absorption for plants and animals.

9. The kite flexible photovoltaic support system of claim 5, wherein: Each photovoltaic power generation plate in the same photovoltaic string is connected into a parallel circuit or / and a series circuit through a conductive slip ring, so that each photovoltaic power generation plate can be rotated around the bearing cable by the wind.

10. The windborne flexible photovoltaic mount system of claim 9, wherein: Each photovoltaic power generation plate is hung on the bearing cable through a conductive slip ring.

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