Strip photovoltaic power generation method

Abstract

This application provides a strip photovoltaic power generation method that uses narrow flat photovoltaic panels to encapsulate a photovoltaic power generation strip. Many photovoltaic power generation strips are connected in series to form photovoltaic power generation cables, which can significantly reduce system costs. The strip photovoltaic power generation method of this application has a large span and few pile foundations, and it hardly interferes with the operation of large agricultural machinery. The shadow moves quickly, not only does it not affect crop photosynthesis, but it also increases production and income, allowing arable land to continue to be cultivated normally. This application opens up a vast new world where photovoltaic power generation does not interfere with arable land cultivation, and provides a unique technical solution for ensuring both energy and food security.

Description

Technical Field

[0001] The present application belongs to the field of agricultural-photovoltaic complementary technology, and specifically relates to a strip photovoltaic power generation method. Background Art

[0002] The applicant's prior application, "High-altitude Photovoltaic Power Generation Method and Photovoltaic Power Generation Cable for Cultivated Land (CN117792235A)," provides a method and a photovoltaic power generation cable for high-altitude photovoltaic power generation over cultivated land. This method involves laying a layer of photovoltaic cells around a high-tensile-strength load-bearing cable to create a photovoltaic power generation cable. This cable is then erected above cultivated land using elevated supports. This system absorbs excess solar energy from the sky for power generation while also providing irrigation for irrigation, achieving a complementary development between agricultural production and photovoltaic power generation—agri-photovoltaic complementarity. Its large span and minimal pile foundations prevent significant interference with agricultural machinery operations. This method overcomes numerous technical drawbacks of existing agricultural-photovoltaic complementarity technologies, including high power generation fluctuations, difficulty in high-altitude installation, high installation costs, difficulty in cleaning and maintenance, short service life, and inadequate utilization of excess solar energy resources above cultivated land.

[0003] However, during production implementation, it was discovered that the current flexible thin-film photovoltaic cells have not yet formed economies of scale, and their market price (about 1.65 yuan / watt) is unlikely to drop to the price level of monocrystalline silicon photovoltaic panels (about 0.8 yuan / watt) within two to three years. Therefore, the cost of photovoltaic power generation cables will remain high in recent years. Summary of the Invention

[0004] The purpose of this application is to provide a strip photovoltaic power generation method so that cheap flat panels such as existing monocrystalline silicon photovoltaic panels can be used to encapsulate another photovoltaic power generation cable, thereby reducing costs.

[0005] In order to achieve the above-mentioned purpose of the invention, the present application provides a strip photovoltaic power generation method as follows.

[0006] The present application provides a strip photovoltaic power generation method, characterized in that it comprises the following steps:

[0007] ① Encapsulating a narrow strip (i.e. linear) photovoltaic cell module – a photovoltaic power generation strip; the strip width D of the photovoltaic power generation strip is less than the set size, and the photovoltaic power generation strip contains at least one (narrow) flat photovoltaic cell panel; the procurement cost of the flat photovoltaic cell panel is much lower than that of the current flexible thin-film photovoltaic cells, thus significantly reducing the system cost;

[0008] ② Multiple photovoltaic power generation strips (fixed in the same direction as the high-strength load-bearing cables) are suspended in the air through towering supports and high-strength load-bearing cables. These multiple photovoltaic power generation strips are connected in series (end to end with high-strength load-bearing cables) to form photovoltaic power generation cables. The height of the photovoltaic power generation cable from the ground is cable height H, the span of a single span of the photovoltaic power generation cable is L, and the horizontal projection spacing between the (two adjacent) photovoltaic power generation cables is K. Among them, 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.

[0009] ③ Make the shading coefficient: D / K less than the set coefficient value.

[0010] Preferably, D is ≤ 10mm, 20mm, 30mm, 50mm, 100mm, 235mm, 322mm, 415mm, 830mm, or 1280mm. The optimal strip width D is between 10mm and 415mm. This is because photovoltaic strips of this width cast a narrower shadow on the ground, minimizing the time it takes to pass over crops, allowing sunlight to be evenly distributed across the crop without affecting normal photosynthesis. Furthermore, the narrower the strip width D, the thinner the transparent protective layer material can be, which in turn makes the photovoltaic strip lighter and the span L larger. It should be noted that the area of ​​each current monocrystalline silicon photovoltaic panel is generally at least 1.134m x 2.238m. For such a large area, the tempered glass used as the transparent protective layer is necessarily thick, heavy, and expensive.

[0011] Preferably, the cable height H ≥ 1m or 2m or 3m or 5m or 10m or 20m or 30m or 50m or 100m and other set dimensions should be such that the cable height H should be high enough to ensure that the top of the highest crop will not touch the photovoltaic power generation cable, preferably H ≥ 5m to ensure that it does not hinder the operation of large agricultural machinery and drones; L ≥ 10m or 20m or 50m or 80m or 150m or 500m, the span L should be large enough to reduce the number of towering support poles, reduce the area occupied by pile foundations, and avoid serious interference with the operation of large agricultural machinery, preferably L ≥ 120m for ultra-large span applications; K ≥ 0.05m or 0.1m or 0.2m or 0.5m or 1m or 2m or 3m or 5m or 10m, the shadow area of ​​the photovoltaic power generation cable should be appropriately reduced, the light needs for crop growth should be guaranteed to a minimum, and the yield reduction due to insufficient photosynthesis should be avoided.

[0012] More preferably, the cable height H is greater than the set size, and the shading coefficient D / K is ≤ 0.01, 0.02, 0.03, 0.05, 0.1, 0.2, 0.3, 0.5, 1, 2, or 3, among other values. This ensures that each midday shadow moves by the width of a midday shadow every 1-20 minutes (preferably every 1-5 minutes), and that the same shadow stays on the same crop for no more than 30 minutes. This prevents reduced crop photosynthesis and yield. To standardize testing standards, midday shadow is defined as the shadow cast by the photovoltaic cable on the ground during the noontime period (i.e., 11:00 to 1:00 PM).

[0013] Research shows that when the cable height is ≥ 2m, the D is ≤ 415mm, and the shading coefficient D / K is ≤ 0.25, the sunlight needed by crops will be blocked for 3-5 minutes every 20 minutes, and this cycle of blocking, releasing, blocking again, and releasing again will reduce the sunlight absorbed by the crops by an average of 13-20%. One set of data shows that a reduction of sunlight by less than 13% (equivalent to a D / K ≤ 0.15) has no effect on crop photosynthesis and yield. Another set of data shows that a reduction of more than 20% (equivalent to a D / K ≥ 0.25) does begin to have some impact on crop photosynthesis and yield. Therefore, a cable height of H ≥ 2m, D ≤ 415mm (235mm is optimal), D / K ≤ 0.25, and a midday shadow width that moves every 1-20 minutes is the golden ratio that does not hinder crop photosynthesis and has universal application value. In this case, the photovoltaic cable's ability to block sunlight is equivalent to the effect of glass with an 80-87% transmittance. Thus, this application utilizes opaque photovoltaic cables combined with a shading coefficient D / K design to achieve the technical effect of semi-transparent photovoltaic panels, realizing the technical goal of exploiting the earth's surplus solar energy resources over large spans at high altitudes.

[0014] Research shows that the length of time a shadow remains on a crop is inversely proportional to H and directly proportional to D. For example, in Xiuying District, Haikou City, a 50-meter-high north-south photovoltaic cable moved at a speed of 68 cm / minute at noon on March 4th (11:00 AM). If the cable's height (H) were reduced to 4.6 meters, the shadow's speed would drop to 2.5 cm / minute. If the cable's height (H) were reduced to 1.2 meters, the speed would drop to 0.6 cm / minute. Furthermore, if the cable's height (H) were reduced to 5 meters at noon on March 4th (1:30 PM), the shadow's speed would drop to 1.3 cm / minute. Comparative observations during the same period revealed that the shadow of a 5-meter-high photovoltaic cable running east-west moved southward at a speed of only 0.33 mm / minute, which is far too slow. In practice, wider photovoltaic cables should be avoided in an east-west orientation and preferably installed in a north-south orientation. This suggests that to mitigate the impact of slow shadow movement on crop growth, the cable height (H) of the photovoltaic cable should be increased. Given that a 1-meter cable height (H) results in a prolonged shadow cast on crops, severely impacting their growth, such a low cable height (H) is not recommended. Furthermore, to mitigate the impact of slow shadow movement on crop growth, the cable width (D) should be minimized.

[0015] In summary, in specific implementations, the cable height H should be preferably greater than 2m, preferably greater than 4m; the strip width D should be preferably less than 0.15m, preferably less than 0.1m; the horizontal projection spacing K should be preferably greater than 0.5m, preferably greater than 1m; and the ratio D / K should be ≤ 0.25, preferably a golden ratio of D / K ≤ 0.15. The current market size of small-sized photovoltaic panels is 1.2m × 0.6m, creating a shadow width of 0.6m, several times 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 (typically exceeding an hour at a time), resulting in reduced photosynthesis and yield, and inevitably causing significant ecological impacts on the existing crops on the farmland.

[0016] In practice, the shading coefficient D / K should be selected based on the crop types in the farmland. For crops that require shading nets to regulate light levels, and for forest land where yield is not a priority, such as vegetable crops like lettuce, spinach, cabbage, mustard greens, celery, greens, and grasslands, the shading coefficient D / K can be appropriately increased, the spacing K reduced, and the strip width D increased.

[0017] Preferably, the strip photovoltaic power generation method 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.

[0018] Also preferably, the photovoltaic cable power generation method is characterized in that the photovoltaic cables are suspended in a north-south direction, which includes all directions with an angle of less than 39 degrees to the meridian. This increases the speed of shadow movement, allowing the shadow to quickly move away from the same crop, thereby reducing the impact on crop photosynthesis.

[0019] Also preferably, the aforementioned strip-cable photovoltaic power generation method is characterized by employing stabilizing cables, commonly found in existing flexible photovoltaic mounts, to further secure the photovoltaic strips and align them in a fixed direction, thereby stabilizing the light-receiving area and improving power generation efficiency. For example, the photovoltaic strips secured to the load-bearing cables are further provided with stabilizing arms, one end of which is secured to the photovoltaic strips and the other to the stabilizing cables or other cables. The length of the stabilizing arms is ≤ K. A longer stabilizing arm increases torque, and therefore, the stabilizing arm length is preferably 50-500 mm.

[0020] Preferably, the strip photovoltaic power generation method is characterized in that: a rod (such as a semi-cylinder or a triangle), or a tube (including an irrigation water pipe), or a profile or other heavy objects are provided under the flat photovoltaic panel to (change the shape of the photovoltaic power generation strip, reduce the torque generated by the wind on the photovoltaic power generation strip, and increase the rigidity and strength of the photovoltaic power generation strip) lower the center of gravity position of the photovoltaic power generation strip to form a self-stabilizing structure (with a center of gravity lower than the load-bearing cable), and rely on the self-weight to make the flat photovoltaic panel always face the specified direction.

[0021] Preferably, the aforementioned strip photovoltaic power generation method is characterized by: an irrigation water pipe (including a hose) (connected to an existing drip irrigation / sprinkler system) is installed (externally attached or pre-buried) on the photovoltaic power generation cable. The photovoltaic power generation cable and the irrigation water pipe share a load-bearing cable and a towering support pole, thereby achieving complementary agriculture and photovoltaic power generation. In this way, the technical solution of this application not only utilizes the excess sunlight above the farmland for photovoltaic power generation, but also provides water for irrigation. It can also absorb heat from the photovoltaic power generation strips to achieve heat dissipation and cooling, thereby improving photovoltaic power generation efficiency. For example, using very thin and lightweight drip irrigation pipes / strips to drip irrigate crops, achieving complementary photovoltaic and irrigation functions.

[0022] Even more preferably, the aforementioned cable photovoltaic power generation method is characterized by the addition (externally mounted or pre-buried) of a supplemental light (commonly known as a plant growth light) to the photovoltaic power generation cable. The photovoltaic power generation cable, the supplemental light, and its power supply conductor share the same load-bearing cable and elevated support pole, which provides supplemental light to light-loving crops at night to promote crop growth. This achieves a three-in-one agricultural photovoltaic system combining photovoltaic power generation with nighttime supplemental lighting and water irrigation. In this way, the present technical solution not only utilizes excess sunlight above cultivated land for photovoltaic power generation, but also facilitates water irrigation and supplemental light to light-loving crops at night to promote crop growth.

[0023] Also preferably, the aforementioned strip photovoltaic power generation method is characterized by providing a transparent protective layer (e.g., a transparent ETFE film or thin transparent glass) in front of the photovoltaic cells on the photovoltaic power generation strip. This prevents the impact of large hailstones from being transmitted to the photovoltaic cells, thereby providing better protection for fragile photovoltaic cells such as silicon wafers. This also reduces the thickness, rigidity, and weight of the transparent protective layer, thereby lowering the cost of the photovoltaic power generation strip and increasing the span L.

[0024] Also preferred is the cable-mounted photovoltaic power generation method, characterized in that the photovoltaic power generation strips are planar photovoltaic panels, one end of which is suspended from a load-bearing cable, allowing the panels to float in the wind (like colorful flags). This reduces wind resistance and wind load, thereby increasing spans, reducing pile density, and alleviating the impact on agricultural machinery operations.

[0025] Still preferably, the aforementioned photovoltaic power generation method is characterized in that the numerous photovoltaic power generation strips connected in series to form a photovoltaic power generation cable are each capable of floating in the wind (around the supporting cable) (i.e., they are not fixed to each other, and the swing of one photovoltaic power generation strip does not affect the swing of another photovoltaic power generation strip), and the center of gravity of each photovoltaic power generation strip is located below (at a distance from) the supporting cable. This creates a self-stabilizing photovoltaic power generation strip structure, which can automatically align the flat photovoltaic panels in the photovoltaic power generation strip in a predetermined direction under the action of gravity.

[0026] The load-bearing cables mentioned in this application generally refer to linear objects that can support photovoltaic power generation strips through tensioning, including ropes, steel cables, chains, linear objects formed by connecting multiple sections of rods or tubes or profiles, etc.

[0027] Compared with the prior art, this application has the following beneficial technical effects.

[0028] First, it possesses all ten beneficial technical effects of the prior application, "High-altitude Photovoltaic Power Generation Method and Photovoltaic Power Generation Cable for Farmland (CN117792235A)," and at a low cost. This is because this application utilizes inexpensive flat panels, such as existing monocrystalline silicon photovoltaic panels (rather than expensive flexible thin-film cells), and encapsulates a minimalist photovoltaic power generation cable, thereby reducing costs.

[0029] Secondly, when large hailstones strike the photovoltaic strips, the transparent protective layer prevents the impact from being transmitted to the photovoltaic cells, thereby providing better protection for fragile photovoltaic cells such as silicon wafers. This, in turn, reduces the thickness, rigidity, and weight of the transparent protective layer, thereby lowering the cost of the photovoltaic strips, enhancing their hail resistance, and increasing the system span L. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of an application of the strip photovoltaic power generation method of this application (Example 1) on a piece of cultivated land.

[0031] Figure 2 For this application (Example 1) Figure 1 Schematic diagram of the horizontal projection cross-sectional structure of seven photovoltaic power generation cables on cultivated land.

[0032] Figure 3 For this application (Example 1) Figure 1 Schematic diagram of the structure of a photovoltaic power generation strip (fixed in the same direction as the load-bearing cable).

[0033] Figure 4 For this application (Example 2) Figure 1 Another structural diagram of a section of photovoltaic power generation strip (fixed in the same direction as the load-bearing cable).

[0034] Figure 5 For this application (Example 3) Figure 1 Another structural diagram of a section of photovoltaic power generation strip (fixed in the same direction as the load-bearing cable).

[0035] Figure 6 For this application (Example 4) Figure 1 Another structural diagram of a section of photovoltaic power generation strip (fixed in the same direction as the two load-bearing cables).

[0036] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of the photovoltaic power generation strip and its load-bearing cables.

[0037] Figure 8 This is a schematic diagram of a self-stabilizing structure in which a load-bearing cable passes through a photovoltaic power generation bar in the present application (Example 5).

[0038] Figure 9 It is a current long flat photovoltaic panel

[0039] Figure 10 A schematic diagram of a current photovoltaic cell.

[0040] Figure 11 This is a structural diagram of a drip irrigation pipe suspended on a photovoltaic power generation cable in this application (Example 6).

[0041] Figure 12 This is a structural diagram of a photovoltaic power generation strip in this application (Example 7) equipped with a supplementary light.

[0042] Figure 13 This is another schematic diagram of the application of the strip photovoltaic power generation method on a piece of cultivated land.

[0043] Figure 14 This is a schematic diagram of a cross-sectional structure of a load-bearing cable passing through a triangular photovoltaic power generation strip in the present application (Example 8).

[0044] Figure 15 This is a schematic diagram of the cross-sectional structure of a flat photovoltaic panel with a bending radius greater than 300 mm used in the photovoltaic power generation strip in this application (Example 9).

[0045] Figure 16 For this application (Example 10) Figure 1 Schematic diagram of the structure of a photovoltaic power generation strip (fixed in the same direction as the load-bearing cable and able to flutter in the wind like a colorful flag).

[0046] Figure 17 This is a schematic diagram of a self-stabilizing structure formed by a T-shaped stabilizing rod in the photovoltaic power generation bar of the present application (Example 11).

[0047] Figure 18 for Figure 17 A schematic diagram of photovoltaic power generation strips connected in series to form photovoltaic power generation cables.

[0048] Explanation of the accompanying numbers: 1-photovoltaic power generation cable, 2-load-bearing cable, 3-flat photovoltaic panel, 4-transparent protective layer, 5-back plate, 6-tall support pole, 601-support beam (or support cable), 7-crop, 8-arable land, 9-shadow, 10-sun, 11-photovoltaic power generation bar, 12-connecting wire, 13-connector, 14-stabilizing arm, 15-air space, 16-screw, 17-sunlight, 18-direction, 19-water pipe, 20-spraying water, 21-supplementary 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 stabilizer bar. DETAILED DESCRIPTION

[0049] In order to make the technical means, creative features, objectives and effects achieved by this application easy to understand, this application is further explained below in conjunction with specific implementation methods.

[0050] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be construed as limitations on this application. It should also be noted that, for ease of description, this application defines the length direction of the photovoltaic power generation cable as the longitudinal direction, and the direction perpendicular thereto as the transverse direction or left-right direction.

[0051] It should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, "connected" can refer to both electrical and direct connection. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0052] Example 1.

[0053] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 13 As shown, thousands of photovoltaic power generation cables 1 are suspended in the air over a thousand mu of cultivated land 8 (such as a wheat field, vegetable field, corn field, or orchard) in a north-south direction, 30-50 meters above the ground and with intervals of 0.5-1 meter.

[0054] The first step is to purchase some 182mm-wide photovoltaic cells 22 and fabricate them into (lightweight) strip-shaped planar photovoltaic panels 3, each 202mm wide and 1200mm long. Because existing curved photovoltaic cells 24 have a very small curvature and are expensive, it is difficult to manufacture photovoltaic power generation strips 11 with a thin strip width D (e.g., within 150mm). Therefore, lightweight, strip-shaped planar photovoltaic panels 3 are used here.

[0055] In the second step, the long, flat photovoltaic panels 3 are directly used as photovoltaic power generation strips 11. They are suspended and connected in series to a load-bearing cable 2 using connectors 13. The cables are then connected in series using connecting wires 12 to form a photovoltaic power generation cable 1. Load-bearing cables 2 with a high tensile strength greater than 1200 MPa are preferred, such as 15.2×3 φ galvanized prestressed steel strands, high-strength fiber ropes, carbon fiber cables, aramid cables, glass fiber cables, steel wire ropes, or lightweight pipes.

[0056] In the third step, the numerous photovoltaic cables 1 are suspended above the farmland 8 via tall support poles 6 exceeding 15 meters, similar to high-voltage transmission lines. The cable height H of the photovoltaic cables 1 from the top of the crop 7 (e.g., coconut trees) can be set to 20 meters, the span L of a single span of the photovoltaic cables 1 can be set to 120-500 meters, and the distance K between the horizontal projections of the photovoltaic cables 1 (on the farmland 8) is preferably set to 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 tops of the crops 7 do not touch the photovoltaic cables 1. L can also be ≥ 10m, 20m, 50m, 100m, or 500m. In short, the span L should be large enough to reduce the number of tall support poles 6, minimize the area occupied by the pile foundation, and avoid serious interference with the operation of large agricultural machinery 25. It is best to make K ≥ 1m or 2m or 3m or 5m or 10m. In short, the width of the photovoltaic power generation cable 1 and the width of the shadow 9 should be appropriately reduced to ensure the light needs of crop 7 growth to a minimum and avoid yield reduction due to insufficient photosynthesis.

[0057] In order to reduce the number of pile foundations, save floor space, and ensure that the photovoltaic power generation cable 1 can be erected along the north-south direction, during specific implementation, the supporting beam 601 in the towering support rod 6 may not use a rigid beam, but a flexible beam (i.e., a supporting cable), such as a very thick steel cable (not shown in the figure).

[0058] It should be noted that, in specific implementations, the width of the photovoltaic cables 1 (i.e., the long, flat photovoltaic panels 3) should be appropriately reduced and the spacing between them appropriately increased to ensure that the ratio of the cable width D to the spacing K of their horizontal projections (on the farmland 8) is: D / K ≤ 0.01, 0.02, 0.03, 0.05, 0.10, 0.20, or 0.30. This allows the shadow 9 of the same photovoltaic cable 1 to quickly (e.g., within 5 minutes) pass over the same crop 7 as the sun 10 moves (preferably, within 5 minutes, a distance equal to the width D). This prevents the same crop 7 from remaining in the shadow 9 of the same photovoltaic cable 1 for extended periods (e.g., longer than 30 minutes), which would reduce photosynthesis and lead to reduced crop yields. Research has found that the length of time the shadow 9 remains on a crop 7 is inversely proportional to H and directly proportional to D. Therefore, in order to reduce the impact of shadows on crop growth, the hanging height H of the photovoltaic power generation cable 1 should be increased as much as possible, and the strip width D of the photovoltaic power generation cable 1 should be minimized. It is best to select H as 2-30m and the strip width D as 10-25cm.

[0059] Example 2.

[0060] like Figure 4As shown in the example above, numerous long, flat photovoltaic panels 3 are directly used as photovoltaic power generation strips 11, connected end-to-end on a load-bearing cable 2. Two stabilizing arms 14 are used to pull these strips to other cables, such as stabilizing cables 24, and connected in series with connecting wires 12, forming a photovoltaic power generation cable 1. These numerous photovoltaic power generation cables 1 are then suspended over farmland 8 via towering support poles 6, exceeding 15 meters, similar to high-voltage transmission lines, to form a cable-type photovoltaic power generation system.

[0061] Example 3.

[0062] like Figure 5 As shown in the example above, numerous long, flat photovoltaic panels 3 are directly used as photovoltaic power generation strips 11. These strips are connected end-to-end using two load-bearing cables 2 threaded through cable rings 26, and then connected in series with connecting wires 12 to form a photovoltaic power generation cable 1. These photovoltaic power generation cables 1 are then suspended over farmland 8 via towering support poles 6, over 15 meters tall, similar to high-voltage transmission lines, to create a cable-type photovoltaic power generation system.

[0063] Example 4.

[0064] like Figure 6 、 Figure 7 As shown, referring to the steps in the previous three examples, a long, flat photovoltaic panel 3 is mounted on a semi-cylinder 5. A 2-5 mm air space 23 (i.e., a certain gap) is placed above the long, flat photovoltaic panel 3. A matching piece of transparent glass (preferably ETFE transparent film) is then placed as a transparent protective layer 4, thus forming a photovoltaic power generation strip 11. Finally, the photovoltaic power generation strip 11 is connected in series by two load-bearing cables 2, forming a photovoltaic power generation cable 1. The numerous photovoltaic power generation cables 1 are then suspended over farmland 8 via towering support poles 6, exceeding 15 meters, similar to high-voltage transmission lines, to form a cable photovoltaic power generation system.

[0065] Example 5.

[0066] like Figure 8 As shown, a long, flat photovoltaic panel 3 is mounted on a backing plate 5 (e.g., a semicircular body that also serves as a water pipe 19). A 2-5 mm air space 23 (i.e., a spaced-apart structure) is placed above the long, flat photovoltaic panel 3. A matching transparent glass (preferably ETFE transparent film) serves as a transparent protective layer 4, forming a photovoltaic power generation strip 11. Finally, the photovoltaic power generation strips 11 are connected in series by a load-bearing cable 2, forming a photovoltaic power generation cable 1. The numerous photovoltaic power generation cables 1 are then suspended over farmland 8 via towering support poles 6, exceeding 15 meters, similar to high-voltage transmission lines, to create a cable-type photovoltaic power generation system.

[0067] The back plate (semi-cylinder) 5 is provided below the planar photovoltaic panel 3. Its purpose is to reduce the torque generated by wind on the photovoltaic power generation bar 11 by changing the shape of the photovoltaic power generation bar 11, to increase the rigidity and strength of the photovoltaic power generation bar 11, and to lower the center of gravity 27 of the photovoltaic power generation bar 11, so as to form a self-stabilizing structure (with a center of gravity lower than the load-bearing cable 2), and to rely on its own weight to make the planar photovoltaic panel 3 always face the specified direction (that is, roughly towards the sun).

[0068] Example 6.

[0069] like Figure 11 As shown, referring to steps 1 to 5 above, an irrigation pipe 19 (connected to the existing drip / sprinkler irrigation system) is added (either externally or pre-buried) to the photovoltaic power generation bar 11 and its photovoltaic power generation cable 1, so that the photovoltaic power generation bar 11 and the irrigation pipe 19 share the load-bearing cable 2 and its towering support rod 6. In this way, the technical solution of this application not only utilizes the excess sunlight 10 above the cultivated land 8 for photovoltaic power generation, but also allows for irrigation using the pipe 19.

[0070] Example 7.

[0071] like Figure 12 As shown in the sixth embodiment, a supplementary photovoltaic light 21 (commonly known as a plant growth light) is added (either externally mounted or pre-buried) to the photovoltaic power generation strip 11. The photovoltaic power generation strip 11, the supplementary photovoltaic light 21, and its power supply wires share the same load-bearing cable 2 and its towering support pole 6. This is used to supplement light for light-loving crops 7 at night, thereby promoting their growth. This achieves a three-in-one agricultural-photovoltaic complementarity: photovoltaic power generation, nighttime supplementary lighting, and water supply for irrigation. In this way, the technical solution of this application not only utilizes the excess sunlight 10 above the cultivated land 8 for photovoltaic power generation, but also provides water supply for irrigation and supplementary light for light-loving crops 7 at night, thereby promoting their growth.

[0072] Embodiment 8.

[0073] like Figure 14As shown, a long, flat photovoltaic panel 3 is embedded in a backplane (triangular prism) 5 to form a triangular photovoltaic power generation strip 11 with a center of gravity significantly lower than the load-bearing cable 2 and the flat photovoltaic panel 3. Connected in series by a load-bearing cable 2, it forms a photovoltaic power generation cable 1. Each of the numerous photovoltaic power generation strips 11 can swing (slightly) around the load-bearing cable 2 (i.e., they are not rigidly fixed to each other; the swing of one photovoltaic power generation strip 11 does not affect the swing of another photovoltaic power generation strip 11). The center of gravity of each photovoltaic power generation strip 11 is located below and at a distance from the load-bearing cable 2. For example, a weight 28, such as an iron bar, can be added to the base of the triangle to further lower the center of gravity. This creates a self-stabilizing photovoltaic power generation strip 11, which, under the action of gravity, automatically aligns the flat photovoltaic panels 3 within the strip 11 in a predetermined direction. Finally, the strips can be suspended over farmland 8 via a towering support pole 6, typically over 15 meters, similar to the installation of a high-voltage transmission line, creating a cable photovoltaic power generation system.

[0074] Embodiment 9.

[0075] like Figure 15 As shown, a long flat photovoltaic cell panel 3 with a bending radius greater than 300mm is purchased, bent and installed on the back plate body (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 rope 2 to form a photovoltaic power generation suspension cable 1. The numerous photovoltaic power generation suspension cables 1 thus manufactured are then suspended above the cultivated land 8 through towering support poles 6 higher than 15 meters, like erecting high-voltage transmission lines, to form a strip photovoltaic power generation system. It should be noted that the photovoltaic cell panel 3 with a bending radius greater than 300mm is a lightweight flat cell, which is essentially still a flat photovoltaic cell panel 3. Its market price is similar to that of ordinary flat cells. Therefore, it can be used preferentially in specific implementations.

[0076] Example 10.

[0077] like Figure 16 As shown, reference embodiment 1 and its Figure 3The photovoltaic power generation strip 11 utilizes a flat photovoltaic panel 3 (for example, a 400mm x 1200mm cadmium telluride glass panel). One side of the panel 3 is suspended from the load-bearing cable 2, allowing it to flutter in the wind (like a colorful flag). This allows the panel 3 to float with the wind when strong winds blow, with its smallest side facing the windward direction. This reduces wind resistance and wind loads, allowing for a larger span, reduced pile density, and less impact on agricultural machinery operations. In other words, this fluttering-like suspension scheme reduces the pressure exerted by strong winds on the load-bearing cable 2 and the panel 3, preventing damage to the panel 3 and breakage of the load-bearing cable 2 in extremely strong winds.

[0078] Example 11.

[0079] like Figure 17 、 Figure 18 As shown, referring to Examples 8 and 9, a long, flat photovoltaic panel 3 is embedded in a backplane (long, flat panel) 5. Two steel bars are then used as T-shaped stabilizers 29, which, together with a metal ball weight 28, form a self-stabilizing photovoltaic power generation bar 11. A load-bearing cable 2 is used to connect the bars together, forming a photovoltaic power generation cable 1. Each of the numerous photovoltaic power generation bars 11 can swing (slightly) around the load-bearing cable 2. In other words, they are not fixed to each other, and the swing of one photovoltaic power generation bar 11 does not affect the swing of another photovoltaic power generation bar 11. This creates a self-stabilizing photovoltaic power generation bar 11, which, under the action of gravity, automatically aligns the flat photovoltaic panels 3 within the photovoltaic power generation bar 11 in a predetermined direction. Finally, the bar 11 can be suspended above farmland 8 via a towering support pole 6 exceeding 15 meters, similar to the installation of a high-voltage transmission line, thus forming a cable photovoltaic power generation system.

[0080] The above disclosure is only a preferred embodiment of the present application. The drawings are merely schematic structural diagrams and are not drawn according to the actual size ratio. They cannot be used to limit the scope of rights of the present application. Equivalent changes made based on the claims of the present application still fall within the scope covered by the present application.

Claims

1. A strip photovoltaic power generation method, characterized in that: It includes the following steps: ① Encapsulating a narrow strip-shaped photovoltaic cell assembly - a photovoltaic power generation strip; the strip width D of the photovoltaic power generation strip is less than the set size, and the photovoltaic power generation strip has at least one flat photovoltaic cell panel; ② A large number of photovoltaic power generation strips are suspended in the air through towering supports and high-strength load-bearing cables. The large number of photovoltaic power generation strips are connected in series to form a photovoltaic power generation cable. The height of the photovoltaic power generation cable from the ground is cable height H, the span of a single span of the photovoltaic power generation cable is L, and the horizontal projection spacing of the photovoltaic power generation cable is K. Among them, 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. ③ Make the shading coefficient: D / K less than the set coefficient value; ④ The photovoltaic power generation cables are erected along the north-south direction, which includes all directions with an angle of less than 39° to the meridian; ⑤ Rope height H ≥ 2m, strip width D ≤ 415mm, shading coefficient D / K ≤ 0.25, each noon shadow moves a distance equal to the width of the noon shadow every 1-20 minutes; ⑥The photovoltaic power generation strip is a flat photovoltaic panel. One end of the flat photovoltaic panel is suspended on a load-bearing cable, and the flat photovoltaic panel can float with the wind; ⑦ The numerous photovoltaic power strips connected in series to form a photovoltaic power cable can each float with the wind.

2. The strip photovoltaic power generation method according to claim 1, characterized in that: D≤10mm or 20mm or 30mm or 50mm or 100mm or 235mm or 322mm 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.

3. The strip photovoltaic power generation method according to claim 1 or 2, which includes any one or more of the following technical features: ① An irrigation water pipe is provided on the photovoltaic power generation cable, and the photovoltaic power generation cable and the irrigation water pipe share the load-bearing rope and the towering support; ② A supplementary light is additionally provided on the photovoltaic power generation cable, and the photovoltaic power generation cable and the supplementary light and its power supply wire share the load-bearing rope and the towering support; ③ On the photovoltaic power generation strip, an airtight transparent protective layer is provided in front of the photovoltaic cell.

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