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

Abstract

A T-shaped photovoltaic cable-based power generation system and a T-shaped photovoltaic rod. The T-shaped photovoltaic rod comprises a vertically-mounted, narrow and elongated photovoltaic panel capable of double-sided power generation, and narrow and elongated reflecting panels lying flat under the photovoltaic panel. The photovoltaic panel can receive direct sunlight and reflected sunlight from the reflecting plates at the same time to generate power. In the present application, existing monocrystalline silicon photovoltaic cell panels and other cost-effective assemblies are used for encapsulation to obtain another type of photovoltaic power generation suspension cable, i.e., a T-shaped photovoltaic cable, and the T-shaped photovoltaic cable has high power generation efficiency and low power generation cost.

Description

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

[0001] This application claims priority from the following Chinese patent applications, the entire contents of which are incorporated herein by reference. Technical Field

[0002] 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

[0003] 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 for photovoltaic power generation at high altitude on cultivated land. It lays a layer of photovoltaic cells around a horizontally suspended high-tensile strength load-bearing cable to encapsulate and produce a photovoltaic power generation cable, and then erects the photovoltaic power generation cable above the cultivated land through vertical supports. On the one hand, it absorbs the surplus solar energy at high altitude to generate electricity, and on the other hand, it can also transport water for irrigation, thus realizing the complementary development of agricultural production and photovoltaic power generation - agricultural and photovoltaic complementarity. Its large span and few pile foundations 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 composed of multiple shorter photovoltaic power generation cables connected together; each shorter photovoltaic power generation cable constitutes a photovoltaic cell module, which is called a photovoltaic cell rod, or photovoltaic rod for short.

[0004] However, during production implementation, it was discovered that the current flexible thin-film photovoltaic cells have yet to achieve economies of scale, and their price (approximately 1.6 yuan / watt) is unlikely to drop to the price level of single-crystalline silicon photovoltaic panels (approximately 0.7 yuan / watt) in the short term. Therefore, the cost of photovoltaic cables encapsulated with them will remain high in the coming years. Summary of the Invention

[0005] One of the purposes of this application is to provide a T-type photovoltaic cable power generation system so that the existing low-cost 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 - the T-type photovoltaic cable.

[0006] The second purpose of this application is to provide another T-shaped photovoltaic rod (assembly) with high power generation efficiency and low power generation cost, so as to be strung together into a T-shaped photovoltaic cable.

[0007] In order to achieve one of the above-mentioned objectives of the invention, the present application provides a T-type photovoltaic cable power generation system as follows.

[0008] The present application provides a T-type photovoltaic cable power generation system, which includes:

[0009] ① A linear photovoltaic cell assembly with an (inverted) T-shaped cross-section—a T-shaped photovoltaic rod (assembly); the T-shaped photovoltaic rod comprises a narrow, long, bifacial photovoltaic (cell) panel standing sideways for power generation, and a narrow, long, long reflector lying flat on the underside of the photovoltaic panel. The reflector reflects incident sunlight onto the photovoltaic panel, allowing the photovoltaic panel to receive both direct sunlight and reflected sunlight (from the reflector), thereby simultaneously irradiating the photovoltaic panel with multiple portions of sunlight 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 herein may be a mirror reflector, a matte reflective white board, a reflective film, a reflective metal foil, or other reflective surface material, and may be a flat reflector or a curved or concave reflector.

[0010] ② A photovoltaic power generation cable composed of multiple T-shaped photovoltaic rods connected in series by a load-bearing cable - a T-shaped photovoltaic cable; the height of the T-shaped photovoltaic cable from the ground 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;

[0011] 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, to ensure that each noon shadow moves a distance of one noon shadow width every 1-20 minutes (preferably every 1-5 minutes), to avoid the same shadow passing over the same crop for too long (for example, more than 30 minutes), which leads to the weakening of the photosynthesis of the crop and reduced 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).

[0012] 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.

[0013] 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.

[0014] 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 area occupied by pile foundations, and avoid serious interference with the operation of large agricultural machinery. It is best that L≥120m for ultra-large span applications.

[0015] 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 widened to reduce the shadow area of ​​the T-type photovoltaic cable, to ensure the minimum light needs for crop growth, and to avoid yield reduction due to insufficient photosynthesis.

[0016] Research has shown that reducing the shading coefficient to a D / K ratio of ≤ 0.25 and raising the cable height to ≥ 3m (H)—blocking the sunlight needed by crops for 3-5 minutes every 20 minutes—in this intermittent lighting cycle—can stimulate crop growth and increase yields. Test data shows that using these intermittent lighting measures reduces the amount of sunlight absorbed by crops by an average of 13-20%. One set of data showed that a reduction of less than 13% (i.e., D / K ≤ 0.15) had no effect on crop photosynthesis and yield, and instead stimulated growth and increased yield. Another set of data showed that a reduction of more than 20% (i.e., D / K ≥ 0.25) did begin to have some impact on crop photosynthesis and yield. Therefore, a reduction of more than 20% in sunlight exposure is not recommended.

[0017] Research shows that the duration of a shadow passing over 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 T-shaped photovoltaic cable exhibited a shadow movement speed of 68 cm / minute at noon on March 4th (11:00 AM). Reducing the height of the T-shaped photovoltaic cable to 4.6 meters reduced the shadow movement speed to 2.5 cm / minute, and reducing it to 1.2 meters reduced the shadow movement speed to 0.6 cm / minute. Furthermore, reducing the height of the T-shaped photovoltaic cable to 5 meters at noon on March 4th (1:30 PM) reduced the shadow movement speed to 1.3 cm / minute. A comparative observation over the same period revealed that a 5-meter-high east-west T-shaped photovoltaic cable exhibited a shadow movement speed (toward the south) of only 0.33 mm / minute, which is far too slow. In practice, thicker T-shaped photovoltaic cables should be avoided in an east-west orientation and preferably installed in a north-south orientation. Therefore, to reduce the impact of slow shadow movement on crop growth, the hanging height H of the T-shaped photovoltaic cable should be increased as much as possible. Given that the shadow stays on the crop for a long time at a height H of 1 meter, which will seriously affect crop growth, such a low height H is not recommended. Of course, to reduce the impact of slow shadow movement on crop growth, the thickness dimension D of the T-shaped photovoltaic cable should be minimized.

[0018] In summary, in specific implementation, the height H should preferably be above 2m, preferably above 4m; the thickness dimension D should preferably be below 0.25m, preferably below 0.15m; the horizontal projection spacing K should also preferably be 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 have a size of 1.22m×0.61m, 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), resulting in the weakening of the crop's photosynthesis and reduced yield, which will inevitably have a greater ecological impact on the original crops in the cultivated land.

[0019] 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 forests where yield is not a priority, such as vegetable crops like lettuce, spinach, cabbage, mustard greens, celery, trees, and grasslands, the shading coefficient D / K can be appropriately increased, the spacing K reduced, and the thickness D increased.

[0020] Preferably, the T-shaped photovoltaic cable power generation system is suspended in the air between two supports in a north-south orientation, where the north-south orientation includes all orientations with an angle of less than 39 degrees to the meridian. The bifacial photovoltaic panels in the T-shaped photovoltaic cable face one east and the other west. The angle θ between the reflector and the front and back surfaces of the photovoltaic panels is ≤ 120°. This can also increase the speed of shadow movement, allowing the shadow to quickly move away from the same crop, reducing the impact on crop photosynthesis.

[0021] It is also preferred that, in the T-type photovoltaic cable power generation system, 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 avoid the photovoltaic panel not receiving direct and reflected sunlight at noon (within about 1-2 minutes) and causing the system to have no electricity or generate very little power.

[0022] Furthermore, preferably, in the T-shaped photovoltaic cable power generation system, the T-shaped photovoltaic rods are connected to the stabilizing cable via stabilizing arms and / or buffer springs. This allows the T-shaped photovoltaic rods to swing with the wind when strong winds strike, thereby buffering the wind force and reducing wind resistance. It should be noted that the buffer springs described herein can effectively reduce the swing amplitude of the T-shaped photovoltaic rods, thereby protecting the photovoltaic panels from excessive stress. After strong winds pass, they automatically assist in resetting the T-shaped photovoltaic rods, ensuring that the photovoltaic panels and reflectors remain relatively stationary, facing the sky.

[0023] 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.

[0024] Technical feature ①: The T-shaped photovoltaic rod is hung 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 onto 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.

[0025] Technical feature ②: The 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.

[0026] 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.

[0027] 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.

[0028] Technical Feature 5: An irrigation pipe (including a hose) (connected to the existing drip / sprinkler system) is attached to (or externally mounted on) the T-shaped photovoltaic cable. The T-shaped photovoltaic cable and the irrigation pipe share a load-bearing cable and support structure, allowing them to irrigate crops and spray pesticides or fertilizers, thereby achieving agricultural and photovoltaic complementarity. In this way, the technical solution not only utilizes excess sunlight above cultivated land for photovoltaic power generation, but also provides water for irrigation and absorbs heat from the photovoltaic panels to dissipate heat and reduce temperatures, thereby improving power generation efficiency.

[0029] Technical Feature 6: A supplementary photovoltaic light (commonly known as a plant growth light) is attached to (or mounted on) the T-shaped photovoltaic cable. The T-shaped photovoltaic cable, the supplementary photovoltaic light, and its power supply wires share the same load-bearing cable and support pole, which is used to provide supplementary light to light-loving crops at night to promote crop growth. In this way, the technical solution of this application can not only utilize the excess sunlight above the cultivated land for photovoltaic power generation, but also transport water for irrigation and provide supplementary light to light-loving crops at night to promote crop growth.

[0030] 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.

[0031] Technical feature ⑧: the angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤90°.

[0032] Technical feature 9: The angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤87°.

[0033] 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.

[0034] In order to achieve the second objective of the above invention, the present application provides a T-shaped photovoltaic rod (assembly) as follows.

[0035] The present application discloses a T-shaped photovoltaic rod (assembly), which 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 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 can receive two types of sunlight at the same time, namely direct sunlight and reflected sunlight (from the reflector), thereby using multiple 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 photovoltaic panel).

[0036] Preferably, in the T-shaped photovoltaic rod (assembly), the included angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤120°, ≤90°, or ≤87° respectively.

[0037] Preferably, the T-shaped photovoltaic rod (assembly) is provided with a ventilation and water-permeable gap at the intersection of the photovoltaic panel and the reflector.

[0038] Compared with the prior art, this application has the following beneficial technical effects.

[0039] 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 suspension cable (CN117792235B)".

[0040] Secondly, the T-shaped photovoltaic cable, which is encapsulated by cheap components such as current 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.

[0041] Third, low cost: The current average price of photovoltaic panels is 200 yuan / m², and reflectors can be made of aluminum-coated glass or other reflectors, which cost an average of 40 yuan / m². Therefore, compared to using photovoltaic panels alone to generate electricity, using T-shaped photovoltaic rods equipped with reflectors to collect the same amount of sunlight for power generation can significantly reduce the cost of generating electricity. In other words, this application replaces approximately 50% of expensive photovoltaic panels with inexpensive reflectors, significantly reducing power generation costs.

[0042] Fourth, there will be no linkage and no resonance: In this 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.

[0043] Fifth, intermittent lighting, high frequency and fast shadow movement: When the T-shaped photovoltaic rope 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: blocking the sunlight for a while at regular intervals, for example, blocking the sunlight for 1-5 minutes every 20-30 minutes, and blocking and releasing the sunlight repeatedly in this way, so that the shadow of the T-shaped photovoltaic rope quickly blocks and releases the sunlight multiple times a day, so that the crops under the T-shaped photovoltaic rope can be illuminated intermittently multiple times and for a long time, which can basically meet the growth needs of sunlight all day long. Experimental data shows that this intermittent lighting measure not only does not affect photosynthesis, but can increase the yield of vegetables and other crops, truly realizing the complementary and win-win situation of "agriculture" and "light". BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG1 is a schematic diagram of an application of a T-type photovoltaic cable power generation system on a piece of farmland according to the present application (Example 1).

[0045] FIG2 is a schematic diagram of the horizontal projection cross-sectional structure of multiple T-shaped photovoltaic cables in FIG1 on cultivated land.

[0046] FIG3 is a schematic structural diagram of a photovoltaic rod (module) in FIG1 .

[0047] FIG4 is a schematic diagram of the cross-sectional structure of a photovoltaic rod (module) in FIG3 .

[0048] FIG5 is a schematic diagram of the cross-sectional structure of another photovoltaic rod (assembly) in FIG3 .

[0049] FIG6 is a schematic diagram of the cross-sectional structure of a section of a T-shaped photovoltaic cable in FIG1 .

[0050] FIG7 is a schematic structural diagram of two adjacent sections of T-shaped photovoltaic cables in FIG1 .

[0051] FIG8 is a schematic structural diagram of an irrigation water pipe provided below a section of a T-shaped photovoltaic cable in the present application (Example 2).

[0052] FIG9 is a schematic structural diagram of a T-shaped photovoltaic cable with a supplementary light provided below it in the third embodiment of the present application.

[0053] FIG10 is a schematic structural diagram of the photovoltaic rod (assembly) in FIG3 with ventilation and water-permeable gaps.

[0054] FIG11 is a schematic diagram of another structure in which the buffer spring and the stabilizing rope in FIG6 are replaced by a counterweight.

[0055] FIG12 is a schematic diagram of a structure in which two load-bearing cables and one stabilizing cable are used to fix photovoltaic panels in a current flexible photovoltaic support.

[0056] Explanation of the accompanying numbers: 1-T-type photovoltaic cable, 101-T-type photovoltaic rod, 2-load-bearing cable, 3-photovoltaic panel, 4-reflective plate, 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 piece, 17-spraying water, 18-supplementary photoelectric lamp, 19-ventilation and water-permeable gap, 20-counterweight, 21-connecting wire, 22-screw. DETAILED DESCRIPTION

[0057] 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.

[0058] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations 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, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0059] 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.

[0060] Example 1.

[0061] As shown in Figures 1, 2, 3, 4 and 7, thousands of T-shaped photovoltaic cables 1 are hung in the north-south direction at a height of 3-5 meters above the ground and at intervals of 0.5-1.5 meters above the ground over a piece of farmland 8 covering thousands of acres (such as a wheat field, vegetable field, corn field or orchard).

[0062] 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 standby use.

[0063] The second step is to purchase some 202mm wide and 1200mm long aluminum-coated glass mirrors as spare reflectors 4.

[0064] In the third step, the two reflectors 4 are grouped together as the bottom edge of the inverted T-shaped structure, and the photovoltaic panel 3 is placed sideways in the middle of the bottom edge, so that the two reflectors 4 and a photovoltaic (battery) panel 3 form an inverted T-shaped photovoltaic rod 101.

[0065] Preferably, the included angle θ between the reflector 4 and the front and back surfaces of the photovoltaic panel 3 should be ≤ 90°.

[0066] It is also desirable that a ventilation and water-permeable gap 19 is opened at the intersection of the photovoltaic panel 3 and the reflector 4 to facilitate ventilation, water permeability, drainage and dust removal, and reduce wind resistance.

[0067] Preferably, the T-shaped photovoltaic rods 101 are connected to the stabilizing cables 7 via stabilizing arms 5 and / or buffer springs 6, so that when strong winds strike, the T-shaped photovoltaic rods 101 can swing with the wind, thereby buffering the wind force and reducing wind resistance. It should be noted that the buffer springs 6 described herein can effectively reduce the swing amplitude of the T-shaped photovoltaic rods 101, thereby protecting the photovoltaic panels 3 from excessive stress. After strong winds pass, they automatically assist the T-shaped photovoltaic rods 101 in resetting, allowing the photovoltaic panels 3 and reflectors 4 to remain in a relatively static state facing the sky.

[0068] Preferably, the T-shaped photovoltaic rod 101 is hung 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.

[0069] Preferably, the T-shaped photovoltaic rod 101 rides 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).

[0070] 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. Referring to Figure 12, the "load-bearing cables" and "stabilizing cables" in the "A Large-span Hyperbolic Suspension Flexible Photovoltaic Support (CN219834036U)" are used to fix the T-shaped photovoltaic rod 101 so that the photovoltaic panels 3 inside are oriented in a fixed direction (due east and due west), thereby stabilizing the light-receiving area and improving power generation efficiency. The solution of using two load-bearing cables 2 to fix the T-shaped photovoltaic rod 101 is feasible but not desirable. This is because: when the wind is strong, the swing of one T-shaped photovoltaic rod 101 will inevitably cause the other two adjacent T-shaped photovoltaic rods 101 to swing accordingly, which is very likely to cause resonance and easily damage the entire T-shaped photovoltaic cable 1.

[0071] 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 damage to the photovoltaic panel 3 caused by the hail.

[0072] In the fourth step, as shown in Figure 7, multiple T-shaped photovoltaic rods 101 are connected in series with a load-bearing rope 2 to form a T-shaped photovoltaic rope 1. As shown in Figure 1, multiple T-shaped photovoltaic ropes 1 are suspended in the air 3-5 meters above the ground in a north-south direction, forming a T-shaped photovoltaic rope power generation system that can generate electricity while continuing to farm normally without occupying arable land 8.

[0073] Example 2.

[0074] As shown in Figures 5 and 6, 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°. This prevents the photovoltaic panel 3 from receiving neither direct nor reflected sunlight 10 during midday (for approximately 1-2 minutes), which could result in a system outage or minimal power generation. This way, in the morning, some sunlight 10 can directly strike the east side of the photovoltaic panel 3 from the east, while some sunlight 10 can strike the reflector 4 from the east and then be reflected to the east side of the photovoltaic panel 3. In the afternoon, some sunlight 10 can directly strike the west side of the photovoltaic panel 3 from the west, while some sunlight 10 can strike the reflector 4 from the west and then be reflected to the west side of the photovoltaic panel 3, allowing the photovoltaic panel 3 to receive double sunlight for power generation.

[0075] Example 3.

[0076] As shown in FIG11 , 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 is always kept in a sideways (ie, perpendicular to the ground) posture by relying on the gravity of the counterweight 20 .

[0077] Example 4.

[0078] As shown in Figure 8, referring to the above three steps, an irrigation pipe (including a hose) 15 (connected to the existing drip irrigation / sprinkler system) is added (or attached) to the T-shaped photovoltaic cable 1. The T-shaped photovoltaic cable 1 and the irrigation pipe 15 share a load-bearing cable 2 and a support 11, which are used to irrigate crops 12 and spray pesticides or fertilizers, thereby achieving agricultural and photovoltaic complementarity. In this way, the technical solution of this application can not only utilize the excess sunlight 10 above the cultivated land 8 for photovoltaic power generation, but also transport water for irrigation and absorb heat from the photovoltaic panels 3 to dissipate heat and reduce temperature, thereby improving power generation efficiency.

[0079] Example 5.

[0080] As shown in FIG9 , referring to the above four steps, a supplementary light 18 (commonly known as a plant growth light) is added (or attached) to the T-shaped photovoltaic cable 1. The T-shaped photovoltaic cable 1, the supplementary light 18, and its power supply wires share the load-bearing cable 2 and support 11, which are used to provide supplementary light to light-loving crops 12 at night to promote the growth of crops 12. In this way, the technical solution of the present application can not only utilize the excess sunlight 10 above the cultivated land 8 for photovoltaic power generation, but also transport water for irrigation and provide supplementary light to light-loving crops 12 at night to promote the growth of crops 12.

[0081] 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 T-shaped photovoltaic cable power generation system, comprising an upright support, a horizontal 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 consists of a narrow, long photovoltaic panel standing sideways for bifacial power generation, and a narrow, long reflector lying flat on the underside of the photovoltaic panel. The reflector reflects sunlight incident on it onto the photovoltaic panel, allowing the photovoltaic panel to receive both direct and reflected sunlight, thereby using multiple portions of sunlight to illuminate the photovoltaic panel simultaneously and generate electricity. ② A photovoltaic power generation cable composed of multiple T-shaped photovoltaic rods connected in series by a load-bearing cable - a T-shaped photovoltaic cable; the height of the T-shaped photovoltaic cable from the ground 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 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-shaped 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 of less than 39 degrees with the meridian; the bifacial photovoltaic panels in the T-shaped photovoltaic cable have one side facing east and the other side facing west; the angle θ between the reflector and the front and back surfaces of the photovoltaic panels is ≤120° respectively.

3. The T-shaped 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 hit, the T-shaped photovoltaic rods can swing with the wind to buffer the wind 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, with the upper edge of the photovoltaic panel located directly below the load-bearing cable, and the horizontal projection of the load-bearing cable is projected onto 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, with the lower edge of the photovoltaic panel located above the load-bearing cable; ③ The T-shaped photovoltaic rods are laid on multiple load-bearing cables, and both 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 at all times; ⑤ An irrigation pipe is added to the T-shaped photovoltaic cable. The T-shaped photovoltaic cable and the irrigation pipe share the same load-bearing rope and support, which are used 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 wire share the same load-bearing cable and support pole to provide supplementary light to light-loving crops at night; ⑦ The diameter of the load-bearing cable should be 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 caused by hail to the photovoltaic panel; ⑧The included angle θ between the reflector and the front and back surfaces of the photovoltaic panel is ≤90°; ⑨The included 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 reflector.

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 opened 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°.

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°.

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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