T-shaped photovoltaic cable power generation system and T-shaped photovoltaic rod

Abstract

The invention provides a T-shaped photovoltaic cable power generation system and a T-shaped photovoltaic rod, the T-shaped photovoltaic rod comprises a side-standing narrow and long photovoltaic panel capable of generating power from two sides, and a narrow and long reflecting plate lying on the lower side of the photovoltaic panel, and the photovoltaic panel can receive direct sunlight and reflected sunlight from the reflecting plate at the same time to generate power. Another photovoltaic power generation suspension cable, namely the T-shaped photovoltaic cable, is packaged by adopting cheap components such as existing monocrystalline silicon photovoltaic cell panels, and the T-shaped photovoltaic cable is high in power generation efficiency and low in power generation cost.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic power generation and agricultural production technology, and specifically relates to a T-shaped photovoltaic cable power generation system and a T-shaped photovoltaic rod (i.e., a slender photovoltaic cell assembly). Background Art

[0002] The applicant's prior application "Photovoltaic power generation method and photovoltaic power generation cable at high altitude on cultivated land (CN117792235B)" provides a method and photovoltaic power generation cable at high altitude on cultivated land. It lays a photovoltaic cell layer around the horizontally suspended high-tensile strength load-bearing cable to encapsulate and make a photovoltaic power generation cable, and erects the photovoltaic power generation cable above the cultivated land through an erected support. On the one hand, it absorbs the surplus solar energy in the sky to generate electricity, and on the other hand, it can also transport water for irrigation, so as to achieve the complementary development of agricultural production and photovoltaic power generation - agricultural and photovoltaic complementarity. It has a large span and few pile foundations, which can avoid serious interference with agricultural machinery operations. It overcomes many technical defects of existing agricultural and photovoltaic complementary technologies, such as large power generation fluctuations, difficulty in high-altitude erection, high installation costs, difficulty in cleaning and maintenance, short service life, and insufficient and effective exploitation of surplus solar energy resources above cultivated land. Among them, a photovoltaic power generation cable is connected by multiple shorter sections of photovoltaic power generation cables; each shorter section of photovoltaic power generation cable constitutes a photovoltaic cell module, which is called a photovoltaic cell rod, or photovoltaic rod for short.

[0003] However, during the implementation of production, it was found that the current flexible thin-film photovoltaic cells have not yet formed economies of scale, and their prices (about 1.6 yuan / watt) are unlikely to drop to the price level of single-crystal silicon photovoltaic panels (about 0.7 yuan / watt) in the short term. Therefore, the cost of photovoltaic power cables encapsulated with them will remain high in recent years. Summary of the invention

[0004] One of the purposes of this application is to provide a T-type photovoltaic cable power generation system so that the existing cheap flat battery components such as monocrystalline silicon photovoltaic panels can be used to encapsulate another photovoltaic power generation cable with high power generation efficiency and low power generation cost - T-type photovoltaic cable.

[0005] The second purpose of this application is to provide another T-shaped photovoltaic rod (module) with high power generation efficiency and low power generation cost, so as to string them into a T-shaped photovoltaic cable.

[0006] In order to achieve one of the above-mentioned purposes of the invention, the present application provides a T-type photovoltaic cable power generation system as follows.

[0007] The present application provides a T-type photovoltaic cable power generation system, characterized in that it comprises: ① A linear photovoltaic cell assembly with an (inverted) T-shaped cross section - a T-shaped photovoltaic rod (assembly); the T-shaped photovoltaic rod includes a narrow and long photovoltaic (cell) panel for double-sided power generation standing sideways, and a narrow and long reflector lying flat on the lower side of the photovoltaic panel, the reflector reflects the sunlight incident on it onto the photovoltaic panel, so that the photovoltaic panel receives direct sunlight and reflected sunlight (from the reflector) at the same time, thereby using multiple portions of sunlight to illuminate the photovoltaic panel at the same time to generate electricity, thereby improving the power generation efficiency (of the photovoltaic panel) and reducing the power generation cost (of the system); the reflector described here can be a mirror reflector, a matte reflective white board, a reflective film, a reflective metal foil or other reflective surface materials, and can be a flat reflector or a curved or concave reflector; ② A photovoltaic power generation cable formed by connecting multiple T-shaped photovoltaic rods with a load-bearing cable - a T-shaped photovoltaic cable; the height of the T-shaped photovoltaic cable from the ground surface is H, the span of a single span of the T-shaped photovoltaic cable is L, and the horizontal projection spacing of the T-shaped photovoltaic cable is K; among which, 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 The shadow cast by the T-type photovoltaic cable on the ground, including the horizontal projection; wherein, the ratio of the thickness dimension D of the T-type photovoltaic rod (also the thickness dimension D of the T-type photovoltaic cable) to the horizontal projection spacing K of the T-type photovoltaic cable - the shading coefficient: D / K is less than the set coefficient value; preferably, 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 or 3, so as to ensure that each noon shadow moves a distance of one noon shadow width every 1-20 minutes (preferably every 1-5 minutes), so as to avoid the same shadow passing over the same crop for too long (for example, more than 30 minutes), thereby weakening the photosynthesis of the crop and reducing the yield; in order to unify the detection standards, the noon shadow is defined here as the shadow cast by the T-type photovoltaic cable on the ground by the sun at noon (i.e., 11:00 to 13:00).

[0008] Preferably, D≤10mm or 20mm or 30mm or 50mm or 100mm or 200mm or 300mm or 500mm or 680mm or 790mm; the optimal thickness D is 10mm to 200mm, because the shadow of the T-shaped photovoltaic cable with this thickness D is narrower on the ground, the time it takes to pass through the crops is shorter, and normal photosynthesis is not affected.

[0009] Preferably, H ≥ 1m or 2m or 3m or 5m or 10m or 20m or 30m or 50m or 100m. The height H should be high enough to ensure that the top of the highest crop will not touch the T-shaped photovoltaic cable. It is best that H ≥ 5m to ensure that it does not hinder the operation of large agricultural machinery and drones.

[0010] Preferably, L ≥ 10m or 20m or 50m or 80m or 150m or 500m or 1000m. The span L should be large enough to reduce the number of towering support poles, reduce the footprint of pile foundations, and avoid serious interference with the operation of large agricultural machinery. It is best that L ≥ 120m for ultra-large span applications.

[0011] Preferably, K ≥ 0.05m or 0.1m or 0.2m or 0.5m or 1m or 2m or 3m or 5m or 10m. The spacing K should be appropriately increased to reduce the shadow area of ​​the T-type photovoltaic cable, ensure the light needs for crop growth to a minimum, and avoid yield reduction due to insufficient photosynthesis.

[0012] Studies have shown that reducing the shading coefficient to make D / K≤0.25, raising the cable height to make H≥3m, and blocking the sunlight needed by crops for 3-5 minutes every 20 minutes, so that crops can be intermittently illuminated by constantly blocking, releasing, blocking again, and releasing again, can stimulate crop growth and increase crop yields. Test data show that when the above intermittent lighting measures are adopted, the sunlight absorbed by crops is reduced by an average of 13-20%. One set of data shows that when the sunlight exposure is reduced by less than 13% (that is, D / K≤0.15), it has no effect on the photosynthesis and yield of crops, but will stimulate crop growth and increase crop yields; another set of data shows that when the sunlight exposure is reduced by more than 20% (that is, D / K≥0.25), it will begin to have some impact on the photosynthesis and yield of crops. Therefore, it is not recommended to reduce the sunlight exposure by more than 20% in specific implementation.

[0013] Research shows that the length of time a shadow passes over the same crop is inversely proportional to H and directly proportional to D. Taking Xiuying District, Haikou City as an example, the shadow of a 50-meter-high T-type photovoltaic cable running north-south moved at a speed of 68 cm / minute at noon on March 4 (11 o'clock); if the height H of the T-type photovoltaic cable is reduced to 4.6 meters, the shadow movement speed will drop to 2.5 cm / minute, and if the height H of the T-type photovoltaic cable is reduced to 1.2 meters, the shadow movement speed will drop to 0.6 cm / minute. At noon on March 4 (13:30), the height H of the T-type photovoltaic cable was reduced to 5 meters, and the shadow movement speed would drop to 1.3 cm / minute. Comparative observations over the same period show that the shadow of a 5-meter-high T-type photovoltaic cable running east-west moved at a speed of only 0.33 mm / minute (towards the south), which is too slow. In specific implementation, it is necessary to avoid installing thicker T-type photovoltaic cables along the east-west direction as much as possible, and to install them along the north-south direction as much as possible. It can be seen that in order to reduce the impact of slow shadow movement on crop growth, the hanging height H of the T-type photovoltaic cable should be increased as much as possible. Given that when the height H is 1 meter, the shadow stays on the crop for a long time, which will seriously affect the growth of the crop, 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 thickness D of the T-type photovoltaic cable should be minimized.

[0014] In summary, in specific implementation, the height H should be preferably above 2m, preferably above 4m; the thickness dimension D should be preferably below 0.25m, preferably below 0.15m; the horizontal projection spacing K should also be preferably above 0.5m, preferably above 1m; D / K≤0.25, preferably the golden ratio of D / K≤0.15. The current market's small-sized photovoltaic panels are 1.22m×0.61m in size, and the shadow they produce is 0.61m wide, three times the maximum preferred shadow width of 0.25m in this application. Such a wide shadow will inevitably stay on the same crop for a long time (generally more than 1 hour each time), which will weaken the photosynthesis of the crop and reduce the yield, and will inevitably cause a greater ecological and environmental impact on the original crops in the cultivated land.

[0015] In specific implementation, the shading coefficient D / K should be selected according to the types of crops in the cultivated land. For crops that need shading nets to adjust the light level and for forests that do not care about yield, such as vegetable crops such as lettuce, lettuce, spinach, cabbage, mustard, celery, trees, grasslands, etc., the shading coefficient D / K can be appropriately increased, the spacing K can be reduced, and the thickness D can be increased.

[0016] Preferably, the T-type photovoltaic cable power generation system is characterized in that: the T-type photovoltaic cable is suspended in the air between two supports along a north-south direction, and the north-south direction includes all directions with an angle less than 39 degrees with the meridian; the double-sided photovoltaic panel in the T-type photovoltaic cable faces east and west; the angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤120°. In this way, the shadow movement speed can be increased, so that the shadow can quickly move away from the same crop, reducing the impact on crop photosynthesis.

[0017] Also preferably, the T-type photovoltaic cable power generation system is characterized in that: the angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤90° respectively; preferably, the angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤87° respectively, so as to prevent the photovoltaic panel from receiving no direct and reflected sunlight at noon (within about 1-2 minutes) and causing the system to have no electricity or generate very little power.

[0018] It is also preferred that the T-type photovoltaic cable power generation system is characterized in that: the T-type photovoltaic rod is connected to the stabilizing cable through a stabilizing arm and / or a buffer spring, so that when a strong wind strikes, the T-type photovoltaic rods can swing with the wind to buffer the wind force and reduce wind resistance. It should be noted that the buffer spring described here can effectively slow down the swing amplitude of the T-type photovoltaic rod, thereby protecting the photovoltaic panel from excessive stress, and automatically assisting the T-type photovoltaic rod to reset after a strong wind, so that the photovoltaic panel and the reflector remain in a relatively static state facing the sky.

[0019] It is also preferred that the T-type photovoltaic cable power generation system includes any one or any multiple of the following technical features ①-⑩.

[0020] Technical feature ①, the T-shaped photovoltaic rod is suspended on a load-bearing cable, the upper edge of the photovoltaic panel is located directly below the load-bearing cable, and the horizontal projection of the load-bearing cable is projected on the upper edge of the photovoltaic panel; the T-shaped photovoltaic rod can swing around the load-bearing cable with the wind, and its swing angle is limited to 180° by the stabilizing arm and / or the buffer spring to prevent the T-shaped photovoltaic rod from swinging around the load-bearing cable by more than 360° and breaking the connecting wires.

[0021] Technical feature ②: The T-shaped photovoltaic rod rides on a load-bearing cable, and the lower edge of the photovoltaic panel is located above the load-bearing cable.

[0022] Technical feature ③: T-shaped photovoltaic rods are laid on multiple load-bearing cables, and both sides of the reflector are fixed on the load-bearing cables.

[0023] Technical feature ④: The T-shaped photovoltaic rod is connected to the counterweight through a stabilizing arm so that the photovoltaic panel always maintains a sideways (i.e., perpendicular to the ground) posture.

[0024] Technical feature ⑤, an irrigation pipe (including a water hose) (connected to the current drip irrigation / sprinkler irrigation system) is added (or hung) on ​​the T-shaped photovoltaic cable, and the T-shaped photovoltaic cable and the irrigation pipe share the load-bearing cable and support to irrigate crops, spray pesticides or water fertilizers, thereby achieving agricultural and photovoltaic complementarity. In this way, the technical solution of this application can not only use the surplus sunlight above the cultivated land for photovoltaic power generation, but also can transport water for irrigation, and can also absorb the heat of the photovoltaic panel to achieve the effect of heat dissipation and cooling, and improve the power generation efficiency.

[0025] Technical feature ⑥, a supplementary light (commonly known as a plant growth light) is added (or hung) on ​​the T-shaped photovoltaic cable. The T-shaped photovoltaic cable, the supplementary light and its power supply wire share the load-bearing cable and the supporting rod to supplement light for light-loving crops at night to promote crop growth. In this way, the technical solution of this application can not only use the surplus sunlight above the cultivated land for photovoltaic power generation, but also can transport water for irrigation, and can also supplement light for light-loving crops at night to promote crop growth.

[0026] Technical feature ⑦: The diameter of the load-bearing cable is 1.5-4.5 times the thickness of the photovoltaic panel, so that the load-bearing cable can intercept hail falling directly above, thereby reducing the damage of hail to the photovoltaic panel.

[0027] Technical feature ⑧: the angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤90° respectively.

[0028] Technical feature ⑨: The angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤87° respectively.

[0029] Technical feature ⑩: A ventilation and water-permeable gap is opened at the intersection of the photovoltaic panel and the reflector to facilitate ventilation and water permeability, cleaning and dust removal, and reduce wind resistance.

[0030] In order to achieve the second objective of the invention, the present application provides a T-shaped photovoltaic rod (assembly) as follows.

[0031] The present application discloses a T-shaped photovoltaic rod (assembly), characterized in that: it is a linear photovoltaic cell assembly with an (inverted) T-shaped structure in cross section; the linear assembly includes a narrow and long photovoltaic (cell) panel for double-sided power generation standing on its side, and a narrow and long reflective plate lying flat on the lower side of the photovoltaic panel; the reflective plate reflects the sunlight incident thereon onto the photovoltaic panel, so that the photovoltaic panel can receive two types of sunlight, namely direct sunlight and reflected sunlight (from the reflective plate), thereby using multiple portions of sunlight to simultaneously illuminate the photovoltaic panel to generate electricity, thereby improving the power generation efficiency (of the photovoltaic panel) and reducing the power generation cost (of the photovoltaic panel).

[0032] Preferably, the T-shaped photovoltaic rod (assembly) is characterized in that the angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤120° or ≤90° or ≤87° respectively.

[0033] Preferably, the T-shaped photovoltaic rod (assembly) is characterized in that a ventilation and water-permeable gap is provided at the intersection of the photovoltaic panel and the reflective plate.

[0034] Compared with the prior art, the present application has the following beneficial technical effects.

[0035] First, it has all ten beneficial technical effects of the prior application "High-altitude photovoltaic power generation method for cultivated land and photovoltaic power generation cable (CN117792235B)".

[0036] Secondly, the T-shaped photovoltaic cable encapsulated by the current cheap components such as monocrystalline silicon photovoltaic panels can improve the power generation efficiency (of photovoltaic panels) because it has the function of receiving multiple types of light such as direct sunlight and reflected sunlight to generate electricity at the same time.

[0037] Third, low cost: the current average price of photovoltaic panels is 200 yuan / m 2 The reflector can be made of aluminum-coated glass, etc. The average price is 40 yuan / m 2 It can be seen that compared with using photovoltaic panels to generate electricity, collecting the same amount of sunlight for power generation and using T-shaped photovoltaic rods with reflectors to generate electricity can significantly reduce the power generation cost (of photovoltaic panels). In other words, this application replaces about 50% of expensive photovoltaic panels with cheap reflectors, which can significantly reduce the power generation cost.

[0038] Fourth, there will be no linkage and no resonance: In the present application, the T-shaped photovoltaic rods are separated structures and have no linkage connection with each other. The violent swing of one T-shaped photovoltaic rod will not be transmitted to other T-shaped photovoltaic rods through a load-bearing cable, and no resonance will occur.

[0039] Fifth, intermittent lighting, high frequency and fast shadow movement: When the T-shaped photovoltaic cable is hung in a north-south direction, its shadow can be quickly moved away from the crops. Some vegetable test experiments conducted by the applicant show that the sunlight is blocked for a while at regular intervals, for example, 1-5 minutes of sunlight is blocked every 20-30 minutes, and the sunlight is blocked and released repeatedly in this way, so that the shadow of the T-shaped photovoltaic cable quickly blocks and releases the sunlight multiple times a day, so that the crops under the T-shaped photovoltaic cable can be intermittently illuminated multiple times and for a long time, which can basically meet the growth needs of sunlight all day long. Experimental data show that this intermittent lighting measure will not only not affect photosynthesis, but can increase the yield of vegetables and other crops, and truly achieve the complementary and win-win situation of "agriculture" and "light". BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of an application of a T-type photovoltaic cable power generation system on a piece of farmland in the present application (Example 1).

[0041] Figure 2 for Figure 1Schematic diagram of the horizontal projection cross-sectional structure of multiple T-shaped photovoltaic cables on cultivated land.

[0042] Figure 3 for Figure 1 Schematic diagram of the structure of a photovoltaic rod (module).

[0043] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of a photovoltaic rod (module).

[0044] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of another photovoltaic rod (module).

[0045] Figure 6 for Figure 1 Schematic diagram of the cross-sectional structure of a section of T-shaped photovoltaic cable.

[0046] Figure 7 for Figure 1 Schematic diagram of the structure of two adjacent sections of T-shaped photovoltaic cables.

[0047] Figure 8 This is a schematic diagram of the structure in which an irrigation water pipe is provided below a section of T-shaped photovoltaic cable in the present application (Example 2).

[0040] Fig. 9 This is a schematic diagram of the structure in which a supplementary light is provided under a section of T-shaped photovoltaic cable in the present application (Example 3).

[0048] Fig.10 for Figure 3 Schematic diagram of the structure in which the photovoltaic rod (module) is provided with ventilation and water permeable gaps.

[0049] Fig.11 for Figure 6 Another structural schematic diagram in which the buffer spring and the stabilizing rope are replaced by a counterweight.

[0050] Fig.12 This is a schematic diagram of a structure in which two load-bearing cables and one stabilizing cable are used to fix photovoltaic panels in the current flexible photovoltaic support.

[0051] Explanation of the accompanying figures: 1-T-type photovoltaic cable, 101-T-type photovoltaic rod, 2-load-bearing cable, 3-photovoltaic panel, 4-reflector, 5-stabilizing arm, 6-buffer spring, 7-stabilizing cable, 8-arable land, 9-shadow, 10-sunlight, 11-support, 12-crop, 13-beam, 14-agricultural machinery, 15-irrigation water pipe, 16-connecting parts, 17-spraying water, 18-supplementary photoelectric lamp, 19-ventilation and water-permeable gap, 20-counterweight, 21-connecting wire, 22-screw. DETAILED DESCRIPTION

[0052] 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.

[0053] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0054] It should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "communication", etc. should be understood in a broad sense. For example, "communication" can mean electrical communication or direct connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] Embodiment 1.

[0056] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 As shown, thousands of T-shaped photovoltaic cables 1 are hung in the north-south direction at a height of 3-5 meters from the ground and at intervals of 0.5-1.5 meters above a piece of cultivated land 8 of thousands of mu (such as a wheat field, a vegetable field, a corn field, or an orchard).

[0057] The first step is to purchase some 182mm wide single crystal photovoltaic cells and make them into 202mm wide, 1200mm long strip photovoltaic (cell) panels 3 that can generate electricity on both sides for backup.

[0058] The second step is to purchase some aluminum-coated glass mirrors with a width of 202 mm and a length of 1200 mm as spare reflectors 4.

[0059] The third step is to group the two reflectors 4 as the bottom edge of the inverted T-shaped structure, and stand the photovoltaic panel 3 on its side in the middle of the bottom edge, so that the two reflectors 4 and a photovoltaic (battery) panel 3 form a T-shaped photovoltaic rod 101 of an inverted T-shaped structure.

[0060] Preferably, the angle θ between the reflector 4 and the front and back surfaces of the photovoltaic panel 3 should be ≤ 90° respectively.

[0061] It is also desirable that a ventilation and water-permeable gap 19 is opened at the intersection of the photovoltaic panel 3 and the reflective plate 4 to facilitate ventilation, water permeability, drainage and dust removal, and reduce wind resistance.

[0062] More preferably, the T-shaped photovoltaic rod 101 is connected to the stabilizing cable 7 through the stabilizing arm 5 and / or the buffer spring 6, so that when strong winds come, the T-shaped photovoltaic rods 101 can swing with the wind to buffer the wind force and reduce wind resistance. It should be noted that the buffer spring 6 described here can effectively reduce the swing amplitude of the T-shaped photovoltaic rod 101, thereby protecting the photovoltaic panel 3 from excessive stress, and automatically assisting the T-shaped photovoltaic rod 101 to reset after the strong wind, so that the photovoltaic panel 3 and the reflector 4 remain in a relatively static state facing the sky.

[0063] Preferably, the T-shaped photovoltaic rod 101 is suspended on a load-bearing cable 2, the upper edge of the photovoltaic panel 3 is located directly below the load-bearing cable 2, and the horizontal projection of the load-bearing cable 2 is projected onto the upper edge of the photovoltaic panel 3; the T-shaped photovoltaic rod 101 can swing around the load-bearing cable 2 with the wind, and its swing angle is limited to 180° by the stabilizing arm 5 and / or the buffer spring 6 to prevent the T-shaped photovoltaic rod 101 from swinging around the load-bearing cable 2 by more than 360° and twisting the connecting wire 21.

[0064] Preferably, the T-shaped photovoltaic rod 101 sits on a load-bearing cable 2, and the lower edge of the photovoltaic panel 3 is located above the load-bearing cable 2 (not shown in the figure).

[0065] Preferably, the T-shaped photovoltaic rod 101 is laid on two load-bearing cables 2, and the two sides of the reflector 4 are fixed on the two load-bearing cables 2 respectively. Fig.12 , the "load-bearing cable" and "stabilizing cable" in "A large-span hyperbolic suspension cable flexible photovoltaic support (CN219834036U)" are used to fix the T-shaped photovoltaic rod 101 so that the photovoltaic panels 3 inside face the fixed direction (due east and due west), thereby stabilizing the light-receiving area and improving the power generation efficiency. The solution of using two load-bearing cables 2 to fix the T-shaped photovoltaic rod 101 is feasible but not advisable, because: when the wind is strong, the swing of one T-shaped photovoltaic rod 101 will inevitably involve the swing of the other two adjacent T-shaped photovoltaic rods 101, which is very likely to cause resonance and easily damage the entire T-shaped photovoltaic cable 1.

[0066] Preferably, the diameter of the load-bearing cable 2 is 1.5-4.5 times the thickness of the photovoltaic panel 3 , so that the load-bearing cable 2 can intercept hail falling directly above, thereby reducing the damage of the hail to the photovoltaic panel 3 .

[0067] The fourth step is Figure 7 As shown, a plurality of T-shaped photovoltaic rods 101 are connected in series by a load-bearing cable 2 to form a T-shaped photovoltaic cable 1. Figure 1 As shown, a plurality of T-shaped photovoltaic cables 1 are hung in the air 3-5 meters above the ground in the north-south direction, thus forming a T-shaped photovoltaic cable power generation system that can generate electricity and cultivate crops as usual without occupying arable land 8.

[0068] Embodiment 2.

[0069] like Figure 5 , Figure 6 As shown, referring to the above example, the angle θ between the reflector 4 and the front and back surfaces of the photovoltaic panel 3 is modified to ≤87° or 75°. In this way, it can be avoided that the photovoltaic panel 3 cannot receive direct and reflected sunlight 10 at noon (about 1-2 minutes), causing the system to be out of power or generate very little power. In this way, in the morning, some sunlight 10 can directly shine on the east side of the photovoltaic panel 3 from the east, and other sunlight 10 can shine on the reflector 4 from the east and then reflect to the east side of the photovoltaic panel 3; in the afternoon, some sunlight 10 can directly shine on the west side of the photovoltaic panel 3 from the west, and other sunlight 10 can shine on the reflector 4 from the west and then reflect to the west side of the photovoltaic panel 3, so that the photovoltaic panel 3 can obtain double light for power generation.

[0070] Embodiment three.

[0071] like Fig.11 As shown, referring to the above two steps, the T-shaped photovoltaic rod 101 is connected to the counterweight 20 through the stabilizing arm 5, and the photovoltaic panel 3 always maintains a sideways (ie, perpendicular to the ground) posture by relying on the self-gravity of the counterweight 20.

[0072] Embodiment 4.

[0073] like Figure 8 As shown, referring to the above three steps, an irrigation water pipe (including a water hose) 15 (connected to the current drip irrigation / sprinkler irrigation system) is added (or hung) on ​​the T-shaped photovoltaic cable 1, and the T-shaped photovoltaic cable 1 and the irrigation water pipe 15 share the load-bearing cable 2 and the support 11, which are used to irrigate the crops 12, spray pesticides or water fertilizers, so as to achieve agricultural and photovoltaic complementarity. In this way, the technical solution of this application can not only use the surplus sunlight 10 above the cultivated land 8 for photovoltaic power generation, but also can transport water for irrigation, and can also absorb the heat of the photovoltaic panel 3 to achieve the effect of heat dissipation and cooling, and improve the power generation efficiency.

[0074] Embodiment five.

[0075] like Fig. 9 As shown, referring to the above four steps, a supplementary light 18 (commonly known as a plant growth light) is added (or hung) on ​​the T-shaped photovoltaic cable 1. The T-shaped photovoltaic cable 1 and the supplementary light 18 and their power wires share the load-bearing cable 2 and the support 11, which are used to supplement light for the light-loving crops 12 at night to promote the growth of the crops 12. In this way, the technical solution of the present application can not only use the surplus sunlight 10 above the cultivated land 8 for photovoltaic power generation, but also can transport water for irrigation, and can also supplement light for the light-loving crops 12 at night to promote the growth of the crops 12.

[0076] What is disclosed above 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 T-type photovoltaic cable power generation system, comprising an upright support, a horizontally hung load-bearing cable and a photovoltaic panel arranged on the load-bearing cable, characterized in that it include: ① A linear photovoltaic cell assembly with a T-shaped cross section - a T-shaped photovoltaic rod; the T-shaped photovoltaic rod includes a narrow and long photovoltaic panel for double-sided power generation standing sideways, and a narrow and long reflector lying flat on the lower side of the photovoltaic panel. The reflector reflects the sunlight incident on it onto the photovoltaic panel, so that the photovoltaic panel receives direct sunlight and reflected sunlight at the same time, thereby using multiple portions of sunlight to illuminate the photovoltaic panel at the same time to generate electricity; ② A photovoltaic power generation cable formed by connecting multiple T-shaped photovoltaic rods with a load-bearing cable - a T-shaped photovoltaic cable; the height of the T-shaped photovoltaic cable from the ground surface is H, the span of a single span of the T-shaped photovoltaic cable is L, and the horizontal projection spacing of the T-shaped photovoltaic cable is K; among which, 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; ③The shadow cast by the T-type photovoltaic cable on the ground, including the horizontal projection; among them, the ratio of the thickness dimension D of the T-type photovoltaic rod to the horizontal projection spacing K of the T-type photovoltaic cable - the shading coefficient: D / K is less than the set coefficient value.

2. The T-type photovoltaic cable power generation system according to claim 1, characterized in that: The T-shaped photovoltaic cable is suspended in the air between two supports along a north-south direction, wherein the north-south direction includes all directions with an angle less than 39 degrees with the meridian; the double-sided photovoltaic panel in the T-shaped photovoltaic cable has one side facing east and the other side facing west; the angle θ between the reflector and the front and back sides of the photovoltaic panel is ≤120° respectively.

3. The T-type photovoltaic cable power generation system according to claim 1, characterized in that: The T-shaped photovoltaic rods are connected to the stabilizing ropes through stabilizing arms and / or buffer springs, so that when strong winds come, the T-shaped photovoltaic rods can swing with the wind to buffer the wind force and reduce wind resistance.

4. The T-type photovoltaic cable power generation system according to claim 1, 2 or 3, comprising any one or more of the following technical features ① to ⑩: ① The T-shaped photovoltaic rod is hung under a load-bearing cable, the upper edge of the photovoltaic panel is located directly below the load-bearing cable, and the horizontal projection of the load-bearing cable is projected on the upper edge of the photovoltaic panel; the T-shaped photovoltaic rod can swing around the load-bearing cable with the wind, and its swing angle is limited to 180° by the stabilizing arm and / or the buffer spring; ②The T-shaped photovoltaic rod sits on a load-bearing cable, and the lower edge of the photovoltaic panel is located above the load-bearing cable; ③ The T-shaped photovoltaic rods are laid on multiple load-bearing cables, and the two sides of the reflector are fixed on the load-bearing cables; ④The T-shaped photovoltaic rod is connected to the counterweight through a stabilizing arm to keep the photovoltaic panel in a sideways position; ⑤ An irrigation pipe is added to the T-shaped photovoltaic cable. The T-shaped photovoltaic cable and the irrigation pipe share the load-bearing rope and support to irrigate crops, spray pesticides or water fertilizers; ⑥ A supplementary light is added to the T-shaped photovoltaic cable. The T-shaped photovoltaic cable, the supplementary light and its power supply wire share the load-bearing cable and supporting pole to supplement light for light-loving crops at night; ⑦ The diameter of the load-bearing cable is 1.5-4.5 times the thickness of the photovoltaic panel, so that the load-bearing cable can intercept the hail falling directly above, thereby reducing the damage of hail to the photovoltaic panel; ⑧ The angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤ 90°; ⑨ The angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤87°; ⑩ A ventilation and water-permeable gap is opened at the intersection of the photovoltaic panel and the reflective plate.

5. A T-shaped photovoltaic rod, characterized in that: It is a linear photovoltaic cell assembly with a T-shaped cross-section; the linear assembly includes a narrow and long photovoltaic panel for double-sided power generation standing on its side, and a narrow and long reflector lying flat on the lower side of the photovoltaic panel; the reflector reflects the sunlight incident on it onto the photovoltaic panel, so that the photovoltaic panel receives direct sunlight and reflected sunlight at the same time, thereby using multiple sunlight to illuminate the photovoltaic panel at the same time to generate electricity.

6. The T-shaped photovoltaic rod according to claim 5, characterized in that: The included angle θ between the front and back surfaces of the reflective plate and the photovoltaic panel is ≤120° respectively; or, a ventilation and water-permeable gap is provided at the intersection of the photovoltaic panel and the reflective plate.

7. The T-shaped photovoltaic rod according to claim 6, characterized in that: The included angles θ between the reflector and the front and back surfaces of the photovoltaic panel are ≤90° respectively.

8. The T-shaped photovoltaic rod according to claim 7, characterized in that: The included angles θ between the reflector and the front and back surfaces of the photovoltaic panel are ≤87° respectively.

9. The T-shaped photovoltaic rod according to claim 5, 6, 7 or 8, characterized in that: The T-shaped photovoltaic rod includes a stabilizing arm and / or a buffer spring.

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