Strip photovoltaic power generation system

Abstract

The invention discloses a cable photovoltaic power generation system, which is characterized in that a photovoltaic power generation strip is packaged by narrow planar photovoltaic cell panels, and a plurality of photovoltaic power generation strips are connected in series to form photovoltaic power generation suspension cables, so that the system cost can be greatly reduced. The strip-shaped photovoltaic power generation method is large in span, few in pile foundation and high in shadow moving speed, operation of large agricultural machinery is hardly hindered, crop photosynthesis is not affected, production and income can be increased, and cultivated land can continue to be cultivated normally. According to the invention, a broad new field in which photovoltaic power generation is not affected by cultivated land planting is developed, and a unique technical solution is provided for ensuring double safety of energy and grains.

Description

[0001] This application is a divisional application of the patent application filed on June 18, 2024, with application number 202410780261.3 and invention title: Strip Photovoltaic Power Generation System. Technical Field

[0002] This application belongs to the field of agricultural-photovoltaic complementary technology, specifically relating to a strip photovoltaic power generation system. Background Technology

[0003] The applicant's prior application, "Method for High-Altitude Photovoltaic Power Generation on Farmland and Photovoltaic Power Generation Suspension Cable (CN117792235A)," provides a method for high-altitude photovoltaic power generation on farmland and a photovoltaic power generation suspension cable. It involves laying a photovoltaic cell layer around a high-tensile-strength load-bearing cable to encapsulate a photovoltaic power generation suspension cable. This cable is then erected above the farmland using tall supports. This allows for the absorption of surplus solar energy from the upper atmosphere for power generation, while also providing irrigation water, achieving complementary development between agricultural production and photovoltaic power generation—agricultural-photovoltaic complementarity. Its large span and minimal pile foundations avoid severely hindering agricultural machinery operations. It overcomes many technical shortcomings of existing agricultural-photovoltaic complementarity technologies, such as large fluctuations in power generation, difficulty in high-altitude erection, high installation costs, difficulty in cleaning and maintenance, short service life, and insufficient and ineffective exploitation of surplus solar energy resources above farmland.

[0004] However, during production, it was found that flexible thin-film photovoltaic cells, due to the lack of economies of scale, are unlikely to see their market price (approximately RMB 1.65 / watt) drop to the price level of monocrystalline silicon photovoltaic panels (approximately RMB 0.8 / watt) within two to three years. Therefore, the cost of photovoltaic power generation will remain relatively high in the coming years. Summary of the Invention

[0005] The purpose of this application is to provide a cable-stayed photovoltaic power generation system that uses inexpensive planar solar panels, such as existing monocrystalline silicon photovoltaic panels, to encapsulate another type of photovoltaic power generation suspension, thereby reducing costs.

[0006] To achieve the above objectives, this application adopts the following solution: a strip photovoltaic power generation system, characterized in that it includes the following steps: ① A narrow strip (i.e. linear) photovoltaic cell module is encapsulated—a photovoltaic strip; the strip width D is less than a set size, and the photovoltaic strip has at least one (narrow) planar photovoltaic cell panel; the planar photovoltaic cell panel has a much lower procurement cost than the current flexible thin-film photovoltaic cells, thus significantly reducing system costs; ② Numerous photovoltaic power generation strips (fixed in the same direction as the high-strength load-bearing cables) are suspended in the air by tall supports and high-strength load-bearing cables. These photovoltaic power generation strips are connected end-to-end by the high-strength load-bearing cables to form photovoltaic power generation suspension cables. The height of the photovoltaic power generation suspension cable above the ground is H, the span of a single photovoltaic power generation suspension cable is L, and the horizontal projection distance between two adjacent photovoltaic power generation suspension cables is K. Among these dimensions, H is greater than the set height dimension, L is greater than the set span dimension, and K is greater than the set spacing dimension. ③Make the shading coefficient: D / K less than the set coefficient value.

[0007] Preferably, D ≤ 10mm, 20mm, 30mm, 50mm, 100mm, 235mm, 322mm, 415mm, 830mm, or 1280mm; the optimal strip width D is 10mm to 415mm because this width of photovoltaic strip casts a narrower shadow on the ground, reducing the time it spends across crops and allowing sunlight to be evenly distributed across all crops without affecting normal photosynthesis. Furthermore, the narrower the strip width D, the thinner the transparent protective layer material can be, resulting in a lighter photovoltaic strip and a larger span L. It should be noted that the area of ​​each current monocrystalline silicon photovoltaic panel is generally over 1.134m × 2.238m. Such a large area, as... Tempered glass with a transparent protective layer is bound to be thick, heavy, and expensive.

[0008] Preferably, the cable height H should be set at 1m, 2m, 3m, 5m, 10m, 20m, 30m, 50m, or 100m. The cable height H should be sufficiently high to ensure that the tallest crop tip does not touch the photovoltaic suspension cable. Ideally, H should be ≥ 5m to ensure that it does not obstruct the operation of large agricultural machinery and drones. The span L should be ≥ 10m, 20m, 50m, 80m, 150m, or 500m. The span L should be sufficiently large to reduce the number of tall support poles, reduce the footprint of the pile foundation, and avoid severely obstructing the operation of large agricultural machinery. Ideally, L should be ≥ 120m for ultra-large span applications. The radius K should be ≥ 0.05m, 0.1m, 0.2m, 0.5m, 1m, 2m, 3m, 5m, or 10m. This should appropriately reduce the shaded area of ​​the photovoltaic suspension cable, minimize the light requirements for crop growth, and avoid insufficient photosynthesis. Sufficient production leads to reduced output.

[0009] More preferably, the cable height H should be greater than the set size, and the shading coefficient D / K should be ≤0.01, 0.02, 0.03, 0.05, 0.1, 0.2, 0.3, 0.5, 1, 2, or 3, etc., to ensure that each noon shadow moves one noon shadow width every 1-20 minutes (preferably every 1-5 minutes); the same shadow should not remain on the same crop for more than 30 minutes, thus preventing reduced photosynthesis and yield. To standardize the testing, noon shadow is defined here as the shadow cast by the sun on the ground from the photovoltaic power generation cable at noon (i.e., 11:00 to 13:00).

[0010] Studies show that when the shading height (H) is ≥ 2m, the shade radius (D) is ≤ 415mm, and the shading coefficient (D / K) is ≤ 0.25, the crops' required sunlight is blocked for 3-5 minutes every 20 minutes, with this cycle of blocking and unblocking repeating. This results in an average reduction of 13-20% in sunlight absorption by the crops. One set of data shows that a reduction of less than 13% (equivalent to D / K ≤ 0.15) has no impact on crop photosynthesis or yield; another set of data shows that a reduction of more than 20% (equivalent to D / K ≥ 0.25) begins to have some impact on crop photosynthesis and yield. Therefore, when the shading height (H) is ≥ 2m, the shading coefficient (D / K) is ≤ 415mm, and the shading coefficient (D / K) is ≤ 0.25, the shading coefficient (D / K) is ≤ 0.25. A 2m span, a diameter (D) ≤ 415mm (235mm is ideal), a D / K ratio ≤ 0.25, and a shift of one noon shadow width every 1-20 minutes represent the golden ratio that does not hinder crop photosynthesis and has universal applicability. Under these conditions, the shading effect of the photovoltaic power generation suspension cable is equivalent to that of glass with 80-87% light transmittance. Therefore, this application, by employing an opaque photovoltaic power generation suspension cable combined with a shading coefficient D / K design, achieves the technical effect of a semi-transparent photovoltaic panel, realizing the technical objective of high-altitude, ultra-large-span exploitation of surplus solar energy resources above the ground.

[0011] Studies show that the duration of a shadow on the same crop is inversely proportional to height (H) and directly proportional to depth (D). Taking Xiuying District of Haikou City as an example, for a north-south photovoltaic power generation suspension cable with a height (H) of 50 meters, the shadow's movement speed at noon (11:00 AM) on March 4th was 68 cm / minute. If the cable height (H) was reduced to 4.6 meters, the shadow's movement speed decreased to 2.5 cm / minute; if it was reduced to 1.2 meters, the speed decreased to 0.6 cm / minute. Then, at noon (1:30 PM) on March 4th, if the cable height (H) was reduced to 5 meters, the shadow's movement speed decreased to 1.3 cm / minute. Comparative observations during the same period showed that for an east-west photovoltaic power generation suspension cable with a height (H) of 5 meters, the shadow's movement speed (towards...) The shadow moves at a speed of only 0.33 mm / min, which is far too slow. In practice, wide photovoltaic suspension cables should be avoided along east-west axes and instead installed along north-south axes whenever possible. Therefore, to mitigate the impact of slow shadow movement on crop growth, the suspension cable height H should be increased as much as possible. However, given that a cable height H of 1 meter results in a long shadow time on the crop, severely impacting crop growth, such a low cable height H is not recommended. Furthermore, to further reduce the impact of slow shadow movement on crop growth, the width D of the photovoltaic suspension cable should also be minimized.

[0012] In summary, in practical implementation, the cable height H should preferably be 2m or more, and preferably 4m or more; the strip width D should preferably be less than 0.15m, and preferably less than 0.1m; the horizontal projection spacing K should preferably be 0.5m or more, and preferably more than 1m; D / K ≤ 0.25, and preferably the golden ratio of D / K ≤ 0.15. However, the current market size of small-sized photovoltaic panels is 1.2m × 0.6m, producing a shadow 0.6m wide, several times wider than the optimal shadow width of 0.2m in this application. Such a wide shadow will inevitably remain on the same crop for a long time (generally exceeding 1 hour each time), leading to weakened photosynthesis and reduced yield, inevitably causing a significant ecological impact on the original crops on the farmland.

[0013] In practice, the shading coefficient D / K should be selected according to the type of crop in the cultivated land. For crops that require shading nets to regulate light levels, and for woodlands where yield is not a concern, such as vegetable crops like lettuce, romaine lettuce, spinach, cabbage, mustard greens, celery, green forests, and grasslands, the shading coefficient D / K can be appropriately increased, the spacing K reduced, and the strip width D increased.

[0014] Preferably, the strip photovoltaic power generation system is characterized by: D≤10mm or 20mm or 30mm or 50mm or 100mm or 235mm or 322mm or 415mm or 830mm, H≥1m or 2m or 3m or 5m or 10m or 20m or 30m or 50m or 100m, L≥10m or 20m or 50m or 80m or 150m or 500m, K≥0.05m or 0.1m or 0.2m or 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 0.10 or 0.20 or 0.30 or 0.50 or 1 or 2 or 3.

[0015] Furthermore, the aforementioned strip-type photovoltaic power generation system is characterized in that: the photovoltaic power generation suspension cable is suspended along a north-south direction, which includes all directions with an angle of less than 39° to the meridian. This increases the speed of shadow movement, allowing the shadow to quickly move away from the same crop, thus reducing the impact on crop photosynthesis.

[0016] Furthermore, the aforementioned strip photovoltaic power generation system is characterized by: using stabilizing cables from existing flexible photovoltaic brackets to further fix the photovoltaic strips, orienting them towards a fixed direction, thereby stabilizing the light-receiving area and improving power generation efficiency. For example, a stabilizing arm is also provided on the photovoltaic strip fixed to the load-bearing cable, with one end fixed to the photovoltaic strip and the other end fixed to the stabilizing cable or other cables; wherein, the length of the stabilizing arm is ≤ K; the longer the stabilizing arm, the greater the torque, therefore, the length of the stabilizing arm is preferably 50-500mm.

[0017] Preferably, the aforementioned strip photovoltaic power generation system is characterized in that: a rod (e.g., a semi-cylinder or triangular prism), a pipe (including an irrigation water pipe), or a profile is provided below the planar photovoltaic panel to lower the center of gravity of the photovoltaic strip, thereby forming a self-stabilizing structure (with the center of gravity lower than the load-bearing cable) by changing the shape of the photovoltaic strip, reducing the torque generated by the wind on the photovoltaic strip, and increasing the rigidity and strength of the photovoltaic strip. The planar photovoltaic panel always faces the specified direction by its own weight.

[0018] Preferably, the aforementioned strip-type photovoltaic power generation system is characterized by: an irrigation water pipe (including a water hose) (connected to an existing drip / sprinkler irrigation system) being installed (externally attached or pre-embedded) on the photovoltaic power generation suspension cable; the photovoltaic power generation suspension cable and the irrigation water pipe sharing a load-bearing cable and a tall support pole, achieving agricultural-photovoltaic complementarity. In this way, the technical solution of this application not only utilizes surplus sunlight above farmland for photovoltaic power generation, but also simultaneously delivers water for irrigation. It can also absorb heat from the photovoltaic strips to achieve heat dissipation and cooling, improving photovoltaic power generation efficiency. For example, very thin and light drip irrigation pipes / belts can be used for drip irrigation of crops, achieving photovoltaic-irrigation complementarity. Supplementary function.

[0019] More preferably, the aforementioned cable-stayed photovoltaic power generation system is characterized by: the addition (external mounting or pre-embedded) of supplemental photovoltaic lights (commonly known as plant growth lights) to the photovoltaic power generation suspension cable; the photovoltaic power generation suspension cable, the supplemental photovoltaic lights, and their power supply wires sharing the same load-bearing cable and tall support pole, used to provide supplemental lighting for light-loving crops at night, thereby promoting crop growth and achieving a three-in-one agricultural-photovoltaic complementarity of photovoltaic power generation, nighttime supplemental lighting, and water supply irrigation. In this way, the technical solution of this application not only utilizes surplus sunlight above cultivated land for photovoltaic power generation, but also provides water supply irrigation, and provides supplemental lighting for light-loving crops at night, thus achieving a three-in-one agricultural-photovoltaic complementarity. Promotes crop growth.

[0020] Preferably, the aforementioned strip photovoltaic power generation system is characterized by having a transparent protective layer (e.g., an ETFE transparent thin film layer or a thin transparent glass) in front of the photovoltaic cells on the photovoltaic strip. This prevents the transparent protective layer from transmitting the impact force to the photovoltaic cells when large hailstones strike the photovoltaic strip, thus providing better protection for fragile photovoltaic cells such as silicon wafers. Correspondingly, the thickness, rigidity, and weight of the transparent protective layer can be reduced, thereby lowering the cost of the photovoltaic strip and increasing the span L.

[0021] Furthermore, the aforementioned strip photovoltaic power generation system is characterized in that: the photovoltaic power generation strip is a planar photovoltaic panel, one end of which is suspended from a load-bearing cable, and the planar photovoltaic panel can flutter in the wind (like a colorful flag).

[0022] This reduces wind resistance and wind load, thereby increasing the span, reducing pile density, and mitigating the impact on agricultural machinery operations.

[0023] Furthermore, the aforementioned strip photovoltaic power generation system is characterized in that: the numerous photovoltaic strips connected in series to form a photovoltaic power generation suspension cable can each sway in the wind (around the load-bearing cable) (i.e., they are not fixed to each other, and the swaying of one photovoltaic strip will not cause the other photovoltaic strip to sway as well), and the center of gravity of each photovoltaic strip is located below the load-bearing cable (at a distance from the load-bearing cable). In this way, a series of self-stabilizing photovoltaic strips are formed, which can automatically orient the planar photovoltaic panels in the photovoltaic strips toward a predetermined direction under the action of gravity.

[0024] The term "load-bearing cable" as used in this application refers to any linear object that can support photovoltaic power generation bars through tension, including ropes, steel cables, chains, and linear objects composed of multiple sections of rods, tubes, or profiles connected together.

[0025] Compared with the prior art, this application has the following beneficial technical effects.

[0026] Firstly, it possesses all ten beneficial technical effects of the prior application "Method for High-Altitude Photovoltaic Power Generation on Cultivated Land and Photovoltaic Power Generation Suspension Cable (CN117792235A)," and is cost-effective. This is because this application uses inexpensive planar solar panels such as existing monocrystalline silicon photovoltaic panels (instead of using expensive flexible thin-film solar panels) and encapsulates another extremely simple photovoltaic power generation suspension cable, thereby reducing costs.

[0027] Secondly, when large hailstones strike the photovoltaic strip, the transparent protective layer prevents the impact from being transferred to the photovoltaic cells, thus providing better protection for fragile photovoltaic cells such as silicon wafers. Correspondingly, the thickness, rigidity, and weight of the transparent protective layer can be reduced, thereby lowering the cost of the photovoltaic strip, enhancing its hail resistance, and increasing the system span L. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an application of the strip photovoltaic power generation system of this application (Example 1) on a piece of farmland.

[0029] Figure 2 This application (Example 1) Figure 1 A schematic diagram of the horizontal projection cross-section of the seven photovoltaic power generation suspension cables on the farmland.

[0030] Figure 3 This application (Example 1) Figure 1 A schematic diagram of the structure of a section of a photovoltaic power generation bar (fixed in the same direction as the load-bearing cable).

[0031] Figure 4 This application (Example 2) Figure 1 Another structural diagram of a section of a photovoltaic power generation bar (fixed in the same direction as the load-bearing cable).

[0032] Figure 5 This application (Example 3) Figure 1 Another structural diagram of a photovoltaic power generation bar (fixed in the same direction as the load-bearing cable).

[0033] Figure 6 This application (Example 4) Figure 1 Another structural diagram of a section of a photovoltaic strip (fixed in the same direction as the two load-bearing cables).

[0034] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure of the photovoltaic power generation strip and its supporting cable.

[0035] Figure 8 This is a schematic diagram of a self-stabilizing structure in which a load-bearing cable passes through a photovoltaic strip, as described in Embodiment 5 of this application.

[0036] Figure 9 This is a type of existing elongated planar photovoltaic panel.

[0037] Figure 10 This is a schematic diagram of a current photovoltaic cell.

[0038] Figure 11 This is a schematic diagram of the structure in this application (Example 6) where a drip irrigation pipe is suspended on a photovoltaic power generation suspension cable.

[0039] Figure 12 This is a schematic diagram of the structure of the photovoltaic power generation strip equipped with a supplementary photovoltaic lamp in this application (Example 7).

[0040] Figure 13 This is a schematic diagram illustrating another application of the strip photovoltaic power generation system of this application on a piece of farmland.

[0041] Figure 14 This is a schematic diagram of a cross-sectional structure in which a load-bearing cable passes through a triangular photovoltaic strip in this application (Example 8).

[0042] Figure 15 This is a schematic diagram of a cross-sectional structure of a planar photovoltaic panel with a bending radius greater than 300mm used in the photovoltaic power generation strip of this application (Example 9).

[0043] Figure 16 This application (Example 10) Figure 1 A schematic diagram of the structure of a section of a photovoltaic power generation bar (fixed in the same direction as the load-bearing cable, and able to flutter in the wind like a colorful flag).

[0044] Figure 17 This is a schematic diagram of a self-stabilizing structure formed by the photovoltaic power generation bar in this application (Example 11) through a T-shaped stabilizing bar.

[0045] Figure 18 for Figure 17 A schematic diagram of photovoltaic power generation strips being connected in series to form a photovoltaic power generation suspension cable.

[0046] Explanation of the reference numerals: 1-Photovoltaic power generation suspension cable, 2-Bearing cable, 3-Planar photovoltaic panel, 4-Transparent protective layer, 5-Back panel body, 6-Tall support rod, 601-Support beam (or support cable), 7-Crop, 8-Farmland, 9-Shadow, 10-Sun, 11-Photovoltaic power generation strip, 12-Connecting wire, 13-Connector, 14-Stabilizing arm, 15-Air space, 16-Screw, 17-Sunlight, 18-Strip, 19-Water pipe, 20-Spraying water, 21-Supplemental light, 22-Photovoltaic cell, 23-Air space, 24-Stabilizing cable, 25-Large agricultural machinery, 26-Cable ring, 27-Center of gravity (position), 28-Weight, 29-T-shaped stabilizing rod. Detailed Implementation

[0047] To make the technical means, creative features, objectives and effects of this application easier to understand, the following describes this application in conjunction with specific implementation methods.

[0048] In the description of this application, it should be noted that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. It should also be noted that, for ease of description, this application defines the length direction of the photovoltaic power generation suspension cable as longitudinal, and the direction perpendicular to it as transverse or left-right.

[0049] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, "communication" can refer to electrical connection or direct connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] Example 1.

[0051] like Figure 1 , Figure 2 , Figure 3 , Figure 13 As shown, thousands of photovoltaic power generation suspension cables 1, spaced 30-50 meters above the ground and spaced 0.5-1 meters apart, are suspended high in the air above a plot of farmland 8 (such as a wheat field, vegetable field, cornfield, or orchard) in a north-south direction.

[0052] The first step is to purchase some 182mm wide photovoltaic cells 22 and fabricate them into lightweight, elongated planar photovoltaic panels 3, each 202mm wide and 1200mm long. Since the existing curved photovoltaic cells 24 have a very small curvature and are very expensive, it is difficult to produce photovoltaic strips 11 with a narrower width D (e.g., less than 150mm). Therefore, lightweight, elongated planar photovoltaic panels 3 are chosen here.

[0053] The second step involves directly using long, flat photovoltaic panels 3 as photovoltaic power generation strips 11, suspending them with connectors 13 and connecting them in series to a load-bearing cable 2, and then connecting them with connecting wires 12 to form a photovoltaic power generation suspension cable 1. It is best to choose a load-bearing cable 2 with a high tensile strength greater than 1200 MPa, such as φ15.2×3 galvanized prestressed steel strand, high-strength fiber rope, carbon fiber cable, aramid cable, fiberglass cable, steel wire rope, or lightweight pipe.

[0054] The third step involves suspending the numerous photovoltaic power generation suspension cables 1 above the cultivated land 8 via towering support poles 6, each over 15 meters high, much like erecting high-voltage power transmission lines. The cable height H of the photovoltaic power generation suspension cable 1 from the top of the crop 7 (e.g., a coconut tree) can be set at 20 meters; the span L of a single photovoltaic power generation suspension cable 1 can be set at 120-500 meters; and the distance K between the horizontal projections of the photovoltaic power generation suspension cables 1 (on the cultivated land 8) is preferably set at 1.2-2.4 meters. For example, H can be ≥ 5m, 10m, 20m, 30m, or 50m. In short, the cable height H should be high enough to ensure that the top of the crop 7 does not touch the photovoltaic power generation suspension cable 1. Alternatively, L can be ≥ 10m, 20m, 50m, 100m, or 500m. In short, the span L should be large enough to reduce the number of towering support poles 6, reduce the footprint of the pile foundation, and avoid seriously hindering the operation of large agricultural machinery 25. Ideally, K should be ≥ 1m, 2m, 3m, 5m, or 10m. In short, the width of the photovoltaic power generation suspension cable 1 and the width of the shadow 9 should be appropriately reduced to ensure the minimum light requirements for crop growth 7 and avoid yield reduction due to insufficient photosynthesis.

[0055] In order to reduce the number of pile foundations, save land area, and ensure that the photovoltaic power generation suspension cable 1 can be erected along the north-south direction, in specific implementation, the support beam 601 in the tall support rod 6 may not be a rigid beam, but a flexible beam (i.e., support cable), such as a very thick steel cable (not shown in the figure).

[0056] It should be noted that, in specific implementation, the width of the photovoltaic power generation suspension cable 1 (i.e., the long strip-shaped flat photovoltaic panel 3) should be appropriately reduced and the spacing of the photovoltaic power generation suspension cables 1 should be appropriately increased to ensure that the ratio of the width D of the photovoltaic power generation suspension cable 1 to the spacing K of the horizontal projection of the photovoltaic power generation suspension cable 1 (on the cultivated land 8) is: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.20 or 0.30, so that the shadow 9 of the same photovoltaic power generation suspension cable 1 can quickly (e.g., within 5 minutes) pass over the same crop 7 as the sun 10 moves (preferably within 5 minutes, it should move a distance of 1 strip width D), so as to avoid the same crop 7 staying in the shadow 9 of the same photovoltaic power generation suspension cable 1 for a long time (e.g., more than 30 minutes), which would reduce photosynthesis and lead to a reduction in crop yield.

[0057] The study found that the duration of shadow 9 on the same crop 7 is inversely proportional to H and directly proportional to D. Therefore, to mitigate the impact of shadow on crop growth, the suspension height (H) of the photovoltaic power generation cable 1 should be maximized, while the width (D) of the cable should be minimized. Ideally, H should be selected as 2-30m and the width (D) as 10-25cm.

[0058] Example 2.

[0059] like Figure 4As shown, referring to the previous example, numerous long, flat photovoltaic panels 3 are directly used as photovoltaic power generation strips 11, connected end to end and erected on a load-bearing cable 2. Two stabilizing arms 14 are used to pull them to other cables such as stabilizing cables 24, and they are connected in series with connecting wires 12, thus forming a photovoltaic power generation suspension cable 1. These numerous photovoltaic power generation suspension cables 1 are then suspended above the farmland 8 via a towering support pole 6 over 15 meters high, similar to erecting high-voltage power transmission lines, thus forming a strip-cable photovoltaic power generation system.

[0060] Example 3.

[0061] like Figure 5 As shown in the example above, numerous long, flat photovoltaic panels 3 are directly used as photovoltaic power generation strips 11. They are connected end-to-end by two load-bearing cables 2 through cable loops 26, and then connected in series with connecting wires 12 to form a photovoltaic power generation suspension cable 1. The numerous photovoltaic power generation suspension cables 1 are then suspended above the farmland 8 by a towering support pole 6 over 15 meters high, similar to erecting high-voltage power transmission lines, thus forming a strip-cable photovoltaic power generation system.

[0062] Example 4.

[0063] like Figure 6 , Figure 7 As shown, referring to the steps in the previous three examples, a long strip of flat photovoltaic panel 3 is embedded into a semi-cylinder 5. Above the long strip of flat photovoltaic panel 3, with an air space 23 of 2-5mm (i.e., a certain gap), a piece of transparent glass (preferably ETFE transparent film) is placed as a transparent protective layer 4, thus forming a photovoltaic power generation strip 11. Finally, the photovoltaic power generation strip 11 is connected by two load-bearing cables 2 to form a photovoltaic power generation suspension cable 1. The numerous photovoltaic power generation suspension cables 1 are then suspended above the farmland 8 through a towering support pole 6 higher than 15 meters, like erecting a high-voltage power transmission line, thus forming a strip photovoltaic power generation system.

[0064] Example 5.

[0065] like Figure 8 As shown, a long strip of flat photovoltaic panel 3 is embedded into a back panel (e.g., a semi-circular body that also serves as a water pipe 19) 5. Above the long strip of flat photovoltaic panel 3, with an air space 23 spaced 23 (i.e., an air gap structure with certain gaps), a piece of transparent glass (preferably ETFE transparent film) that matches it is covered as a transparent protective layer 4, thus forming a photovoltaic power generation strip 11. Finally, the photovoltaic power generation strip 11 is connected by a load-bearing cable 2 to form a photovoltaic power generation suspension cable 1. The numerous photovoltaic power generation suspension cables 1 are then suspended above the farmland 8 through a towering support pole 6 higher than 15 meters, like erecting a high-voltage power transmission line, thus forming a strip photovoltaic power generation system.

[0066] The purpose of setting a back plate (semi-cylinder) 5 below the planar photovoltaic panel 3 is to reduce the torque generated by wind on the photovoltaic strip 11 by changing the shape of the photovoltaic strip 11, to increase the rigidity and strength of the photovoltaic strip 11, and to lower the center of gravity 27 of the photovoltaic strip 11, so as to form a self-stabilizing structure (the center of gravity is lower than the load-bearing cable 2), and rely on its own weight to keep the planar photovoltaic panel 3 always facing the specified direction (i.e., roughly facing the sun).

[0067] Example 6.

[0068] like Figure 11 As shown, referring to the steps in examples one to five above, an irrigation water pipe 19 (connected to the existing drip / sprinkler irrigation system) is added (externally mounted or pre-buried) to the photovoltaic power generation strip 11 and its photovoltaic power generation suspension cable 1, so that the photovoltaic power generation strip 11 and the irrigation water pipe 19 share the load-bearing cable 2 and its tall support rod 6. In this way, the technical solution of this application can not only utilize the surplus sunlight 10 above the cultivated land 8 for photovoltaic power generation, but also use the water pipe 19 for irrigation.

[0069] Example 7.

[0070] like Figure 12 As shown in Example 6, a supplementary photovoltaic light 21 (commonly known as a plant growth light) is added (externally mounted or pre-embedded) to the photovoltaic power generation strip 11. This allows the photovoltaic power generation strip 11, the supplementary photovoltaic light 21, and their power supply wires to share the same load-bearing cable 2 and its tall support rod 6. This is used to provide supplementary lighting for light-loving crops 7 at night, promoting crop growth and achieving a three-in-one agricultural-photovoltaic complementary system combining photovoltaic power generation, nighttime supplementary lighting, and irrigation. In this way, the technical solution of this application not only utilizes the surplus sunlight 10 above the cultivated land 8 for photovoltaic power generation but also provides irrigation and supplementary lighting for light-loving crops 7 at night to promote crop growth.

[0071] Example 8.

[0072] like Figure 14 As shown, a long, flat photovoltaic panel 3 is embedded into a backplate (triangular prism) 5 to form a triangular photovoltaic strip 11 with its center of gravity much lower than the load-bearing cable 2 and the flat photovoltaic panel 3. These strips are connected by a load-bearing cable 2 to form a photovoltaic suspension cable 1. Each of the numerous photovoltaic strips 11 can swing (slightly) around the load-bearing cable 2 (i.e., they are not fixed together; the swinging of one photovoltaic strip 11 will not affect the swinging of another). The center of gravity of each photovoltaic strip 11 is located below the load-bearing cable 2, at a considerable distance from it. For example, by adding a [missing information - likely a typo, should be placed here] at the base of the triangle. Weights such as iron bars 28 are used to further lower the center of gravity. This forms a series of self-stabilizing photovoltaic strips 11, which, under the influence of gravity, automatically orient the planar photovoltaic panels 3 within the strips 11 towards a predetermined direction. Finally, they can be suspended above the farmland 8 via a towering support pole 6 (over 15 meters high), similar to erecting high-voltage power transmission lines, thus forming a strip-type photovoltaic power generation system.

[0073] Example 9.

[0074] like Figure 15 As shown, a long, flat photovoltaic panel 3 with a bending radius greater than 300mm is procured and bent and installed onto a backplate (semi-circular tube) 5 to form a photovoltaic power generation strip 11. Finally, the photovoltaic power generation strip 11 is connected in series with a load-bearing cable 2 to form a photovoltaic power generation suspension cable 1. The numerous photovoltaic power generation suspension cables 1 are then suspended above the farmland 8 via a towering support pole 6 over 15 meters high, similar to erecting high-voltage power transmission lines, thus forming a strip-cable photovoltaic power generation system. It should be noted that the photovoltaic panel 3 with a bending radius greater than 300mm is a lightweight flat-plate battery, essentially still a flat photovoltaic panel 3, and its market price is similar to that of ordinary flat-plate batteries. Therefore, it can be given priority in specific implementations.

[0075] Example 10.

[0076] like Figure 16 As shown, refer to Embodiment 1 and its Figure 3 The photovoltaic power generation strip 11 uses a flat photovoltaic panel 3 (for example, using 400mm×1200mm cadmium telluride photovoltaic glass as the photovoltaic module). One side of the flat photovoltaic panel 3 is suspended from the load-bearing cable 2, allowing the flat photovoltaic panel 3 to sway in the wind (like a colorful flag). In this way, when a strong wind blows, the flat photovoltaic panel 3 can float with the wind, with the smallest side facing the windward side, thereby reducing wind resistance and wind load. This allows for a larger span, a smaller pile foundation density, and less impact on agricultural machinery operations. In other words, this allows it to sway in the wind like a colorful flag. The dynamic planar photovoltaic panel 3 suspension scheme can reduce the pressure exerted by strong winds on the load-bearing cable 2 and the planar photovoltaic panel 3, and prevent damage to the planar photovoltaic panel 3 and breakage of the load-bearing cable 2 in extreme wind conditions.

[0077] Example 11.

[0078] like Figure 17 , Figure 18As shown in Examples 8 and 9, a long, flat photovoltaic panel 3 is embedded into a backplate (long, flat plate) 5. Two steel bars are used as T-shaped stabilizing rods 29, which, along with a metal ball weight 28, form a self-stabilizing photovoltaic strip 11. These are connected by a load-bearing cable 2 to form a photovoltaic suspension cable 1. Each of the numerous photovoltaic strips 11 can swing (small amplitude) around the load-bearing cable 2; that is, they are not fixed together, and the swinging of one photovoltaic strip 11 will not affect the swinging of another. In this way, a series of self-stabilizing photovoltaic strips 11 are formed, which, under the action of gravity, automatically orient the flat photovoltaic panels 3 within the photovoltaic strip 11 towards a predetermined direction. Finally, it can be suspended above the farmland 8 by a towering support pole 6 (over 15 meters high), similar to erecting a high-voltage power transmission line, thus forming a strip-type photovoltaic power generation system.

[0079] The above-disclosed embodiments are merely preferred embodiments of this application. The accompanying drawings are only schematic diagrams and are not drawn to scale. They cannot be used to limit the scope of this application. Equivalent variations made based on the claims of this application still fall within the scope of this application.

Claims

1. A strip photovoltaic power generation system, characterized in that it include: ① Photovoltaic power generation strip, which is a narrow strip-shaped photovoltaic cell module with a width of D, wherein at least one planar photovoltaic cell panel is included; ② A photovoltaic power generation suspension cable is formed by connecting numerous photovoltaic power generation strips. The photovoltaic power generation suspension cable suspends numerous photovoltaic power generation strips in the air through towering supports and high-strength load-bearing cables. The height of the photovoltaic power generation suspension cable above the ground is the cable height H, the span of a single photovoltaic power generation suspension cable is L, and the horizontal projection spacing of the photovoltaic power generation suspension cable is K. Among them, H≥2m, L≥10m, K≥0.5m, D / K≤0.5, and each noon shadow moves a distance equal to the width of one noon shadow every 1-20 minutes.

2. The strip photovoltaic power generation system according to claim 1, characterized in that: D≤50mm or 100mm or 235mm or 322mm or 415mm or 830mm or 1280mm; H≥3m or 5m or 10m or 20m or 30m or 50m or 100m; L≥20m or 50m or 80m or 150m or 500m; K ≥ 1m or 2m or 3m or 5m or 10m; D / K ≤ 0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.25, so that the same shadow passes over the same crop for no more than 30 minutes.

3. A strip photovoltaic power generation system according to claim 1 or 2, characterized in that: It includes any one of the following technical features: ① An irrigation pipe is installed on the photovoltaic power generation suspension cable, and the photovoltaic power generation suspension cable and the irrigation pipe share the load-bearing cable and the tall support structure; ②The photovoltaic power generation bars are pulled to other cables by the stabilizing arm; ③ The photovoltaic power generation suspension cable is erected along a north-south direction, which includes all directions with an angle of less than 39° with the meridian; ④ The photovoltaic power generation strip is a flat photovoltaic panel. The flat photovoltaic panel is suspended from the top of the load-bearing cable. It relies on its own weight to make the flat photovoltaic panel face the predetermined direction and make the flat photovoltaic panel float with the wind. ⑤ Numerous photovoltaic power generation bars, connected in series to form a photovoltaic power generation suspension cable, can each sway in the wind.

4. The strip photovoltaic power generation system according to claim 1 or 2, characterized in that: A supplementary photovoltaic lamp is added to the photovoltaic power generation suspension cable. The photovoltaic power generation suspension cable, the supplementary photovoltaic lamp and their power supply wires share the same load-bearing cable and tall support structure.

5. The strip photovoltaic power generation system according to claim 4, characterized in that: A load-bearing cable is a rope, steel cable, chain, or a linear object made up of multiple sections of bar, tube, or profile connected together.

6. The strip photovoltaic power generation system according to claim 1 or 2, characterized in that: On a photovoltaic power generation strip, there is a transparent protective layer in front of the photovoltaic cells.

7. The strip photovoltaic power generation system according to claim 6, characterized in that: The transparent protective layer is such as an ETFE transparent film layer or a thin transparent glass.

8. The strip photovoltaic power generation system according to claim 1 or 2, characterized in that: A weight is placed below the planar photovoltaic panel, and gravity makes the planar photovoltaic panel face a predetermined direction.

9. The strip photovoltaic power generation system according to claim 7, characterized in that: The weight is one of the following: a rod, a tube, or a profile.

10. The strip photovoltaic power generation system according to claim 1, characterized in that: Each noon shadow moves a distance equal to the width of one noon shadow every 1-5 minutes.

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