Artificial rainfall irrigation power generation system

Abstract

The invention provides an artificial rainfall (type) irrigation power generation system. The artificial rainfall (type) irrigation power generation system comprises a water pipe, a photovoltaic battery assembly, a towering supporting object and a water pipe photovoltaic assembly array transversely hung above a farmland. According to the invention, a photovoltaic power generation system and an agricultural irrigation system are combined into one; solar energy can be collected for power generation while precise and efficient irrigation is achieved, so that the dual technical effects of irrigation and power generation are achieved, the benefits of photovoltaic power generation can be supplemented back to agriculture, and irrigation, fertilization and pesticide spraying services are provided for the agriculture.

Description

Technical Field

[0001] The present application belongs to the field of agricultural-photovoltaic complementary technology and agricultural irrigation technology, and specifically relates to an artificial rainfall (type) tank irrigation power generation system. Background Art

[0002] As an outstanding representative of ancient Chinese water conservancy projects, Zhengguo Canal has profound historical significance not only in its grand irrigation scale, but also in that it opened up a new situation for the development of ancient agricultural civilization. With the continuous growth of the global population and the increasing demand for agricultural production efficiency, modern agriculture has higher and higher requirements for irrigation technology. The continuous development of irrigation technology enables farmers to use limited water resources more effectively to meet the growth needs of crops. Among them, drip irrigation and sprinkler irrigation technology are two advanced irrigation methods that are widely used at present. However, although these two technologies have significant advantages in water saving, there are also some problems that cannot be ignored, especially in the coordination with agricultural machinery farming. These problems not only affect agricultural production efficiency, but also cause unnecessary waste in the utilization of cultivated land resources. Drip irrigation technology is an irrigation method that delivers water directly to the root area of ​​​​the plant, which has a significant water-saving effect. By burying or laying water pipes in the root area of ​​​​the crop, drip irrigation can accurately control the amount of water and avoid the waste of water resources. However, this technology faces the following limitations in practical applications: the laying of water pipes affects mechanical operations. The water pipes of the drip irrigation system usually need to be laid in the farmland, which creates obstacles for the farming of agricultural machinery. When agricultural machinery is engaged in farming, sowing, harvesting and other operations in the field, it is easily affected by the water pipes, resulting in inconvenience in operation and even damage to the equipment. Before the harvest season, the drip irrigation system needs to be removed, which is time-consuming and labor-intensive, increasing the complexity and cost of agricultural production. Difficult maintenance. During the long-term use of the drip irrigation system, the water pipes are easily covered by soil, weeds and other obstacles, making maintenance and repair difficult. Once blocked or damaged, the repair process is complicated and the irrigation operation may need to be stopped, which is extremely detrimental to the normal growth of crops. The life of the water pipe is short. Since the water pipe is exposed to the field for a long time, it is affected by ultraviolet rays, temperature changes and mechanical pressure, and its service life is limited. Frequent replacement increases the cost. Sprinkler irrigation technology is an irrigation method that simulates natural rainfall by spraying water over the crops. Sprinkler irrigation systems usually consist of sprinklers, water pumps and pipes, which can cover large areas of farmland and have uniform irrigation effects. However, in practical applications, sprinkler irrigation technology also faces some challenges: the impact of irrigation vehicles on farmland. The sprinkler irrigation system requires irrigation vehicles to move in the field to operate. However, when irrigation vehicles are driving in the farmland, they will crush the crops, especially during the crop growth period, causing direct economic losses. In order to avoid this problem, farmers usually need to reserve lanes in the field for irrigation vehicles to pass. However, this reserved lane leads to the waste of arable land resources, reduces the actual available planting area, and affects the overall yield. Waste of water resources. Although sprinkler irrigation technology saves water resources compared to traditional irrigation methods, there is still a certain waste of water resources due to evaporation and wind blowing during the spraying process. In addition, during the sprinkler irrigation process, not all the water reaches the roots of the crops, but some of it remains on the leaves or the surface and cannot be effectively absorbed by the crops.Equipment investment and maintenance costs are high. The initial investment of the sprinkler irrigation system is high, and daily operation consumes a lot of energy, especially when irrigating a large area. In addition, regular maintenance and updating of sprinkler irrigation equipment is also a considerable expense. While drip irrigation and sprinkler irrigation technology improve the efficiency of agricultural water use, they also have an impact on the utilization of arable land resources. First of all, due to the laying of water pipes for the drip irrigation system and the reservation of lanes for the sprinkler irrigation system, part of the arable land needs to be occupied, reducing the actual planting area. This waste is particularly significant in large-scale agricultural production, especially in areas with tight arable land resources, which is an issue that cannot be ignored. Secondly, the operation of irrigation vehicles in the field will not only crush crops, but also cause certain damage to the soil structure, affecting the long-term fertility of the soil and the growth conditions of crops. This destructiveness gradually accumulates in farmland that has been using sprinkler irrigation technology for a long time, which may lead to soil compaction and decreased permeability, thereby affecting the yield and quality of crops.

[0003] In view of the above-mentioned problems existing in the practical application of current drip irrigation and sprinkler irrigation technologies, researchers in the industry have been studying how to further improve irrigation efficiency, reduce water waste, and maximize the use of arable land resources without hindering agricultural machinery farming, so as to promote the development of modern agriculture to a higher level. Summary of the invention

[0004] The purpose of this application is to provide an artificial rainfall (type) tank irrigation power generation system, so as to collect solar energy for power generation and form the dual benefits of irrigation and power generation while achieving precise and efficient irrigation; in order to subsidize agriculture through photovoltaic power generation income, and provide irrigation, fertilization and pesticide spraying services for agriculture.

[0005] In order to achieve the above-mentioned purpose of the invention, the present application provides an artificial rainfall (type) tank irrigation power generation system as follows.

[0006] The present application discloses an artificial rainfall (type) tank irrigation power generation system, characterized in that it comprises: ① Irrigation water pipes and photovoltaic cell modules for power generation are combined into a narrow and long water pipe photovoltaic module that can both receive sunlight to generate electricity and transport water to farmland for irrigation, namely, a linear water pipe photovoltaic module; ② The water tube photovoltaic module array arranged at intervals and hung horizontally above the farmland by high supports and load-bearing cables; the width of the water tube photovoltaic module is D (if it is a circle, D refers to the diameter), the height (of the water tube photovoltaic module) is H, the span (of a single span of the water tube photovoltaic module) is L, and the spacing of the horizontal projection (of the water tube photovoltaic module) is K; among which, D is less than the set width dimension, 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 water tube photovoltaic module on the ground, including the horizontal projection; the ratio of the width D of the water tube photovoltaic module to the spacing K of its horizontal projection (water tube photovoltaic module) - the shading coefficient D / K is less than the set coefficient value, and the spacing height ratio K / H is less than the set coefficient value.

[0007] Preferably, the artificial rainfall irrigation power generation system comprises the following a1 to a9, or b1 to b8, or c1 to c6, or e1 to e7, or f1 to f 11 or any one of the technical features from g1 to g5: a1D≤10mm, a2D≤20mm, a3D≤30mm, a4D≤50mm, a5D≤100mm, a6D≤235mm, a7D≤322mm, a8D≤415mm, a9D≤1280mm; b1H≥1m, b2H≥2m, b3H≥3m, b4H≥5m, b5H≥10m, b6H≥20m, b7H≥30m, b8H≥50m; c1L≥10m, c2L≥20m, c3L≥50m, c4L≥80m, c5L≥150m, c6L≥500m; e1K≥0.2m, e2K≥0.5m, e3K≥1, e4K≥2m, e5K≥3m, e6K≥5m, e7K≥10m; f1D / K≤0.01, f2D / K≤0.02, f3D / K≤0.03, f4D / K≤0.05, f5D / K≤0.1, f6D / K≤0.2, f7D / K≤0.3, f8D / K≤0.5, f9D / K≤1, f 10 D / K≤2, f 11 D / K≤3; g1K / H≤0.1, g2K / H≤0.5, g3K / H≤1, g4K / H≤2, g5K / H≤5.

[0008] More preferably, the artificial rainfall irrigation power generation system is characterized in that: the noon shadow of the water tube photovoltaic module moves a distance of the width of the noon shadow every 1-20 minutes or every 1-5 minutes; or, the noon shadow of the water tube photovoltaic module moves a distance of the width of the noon shadow for no more than 30 minutes or 1 hour, so as to avoid weakening the photosynthesis of the crop (i.e., at that location) and reducing the yield; in order to unify the detection standards, the noon shadow is defined here as the shadow cast by the water tube photovoltaic module on the ground by the sun at noon (i.e., 11:00 to 13:00).

[0009] More preferably, the artificial rainfall irrigation power generation system is characterized by: (raising the height H of the water pipe photovoltaic module, reducing the shading coefficient D / K, and increasing the height ratio K / H, so that) the shadows of multiple adjacent water pipe photovoltaic modules (as the sun moves) continuously block, release, block again, and release again to provide intermittent illumination to the crops; (so that) the crops are exposed to sunlight multiple times, for a long time, and intermittently every day to stimulate crop growth and increase crop yields.

[0010] Research shows that if H≥3m, D≤415mm, shading coefficient D / K≤0.25, and height ratio K / H≤1, the sunlight needed by crops will be blocked for 3-5 minutes every 20 minutes; the sunlight of the same crop is blocked, released, blocked again, and released again in turn, so that the crop can get intermittent light to stimulate crop growth and increase crop yield. In this way, the sunlight absorbed by crops will be reduced by an average of 13-20%. One set of data shows that when the sunlight is reduced by less than 13% (equivalent to D / K≤0.15), there is no effect on the photosynthesis and yield of crops; another set of data shows that when the sunlight is reduced by more than 20% (equivalent to D / K≥0.25), there will be some effect on the photosynthesis and yield of crops. Therefore, H ≥ 3m, D ≤ 415mm (235mm is best), D / K ≤ 0.25, height ratio K / H ≤ 1, and each midday shadow moves a distance of 1D every 1-20 minutes, which is the golden ratio that does not hinder crop photosynthesis and has universal use value.

[0011] Research shows that the length of time a shadow stays on 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 water pipe photovoltaic module with a height of 50 meters running north and south moved at a speed of 68 cm / minute at noon on March 4 (11 o'clock); if the height H of the water pipe photovoltaic module is reduced to 4.6 meters, the shadow moving speed will drop to 2.5 cm / minute, and if the height H of the water pipe photovoltaic module is reduced to 1.2 meters, the shadow moving speed will drop to 0.6 cm / minute. At noon on March 4 (13:30), the height H of the water pipe photovoltaic module was reduced to 5 meters, and the shadow moving speed will drop to 1.3 cm / minute. Comparative observations during the same period show that the shadow of a water pipe photovoltaic module with a height H of 5 meters running east-west only moves at a speed of 0.33 mm / minute (towards the south), which is too slow. In specific implementation, it is necessary to avoid installing relatively wide water pipe photovoltaic modules 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 water tube photovoltaic module 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 (more than 1 hour on average), which will seriously affect the growth of the crop, it is not recommended to use such a low height H; in order to reduce the impact of slow shadow movement on crop growth, the width D of the water tube photovoltaic module should also be minimized.

[0012] To sum up, in the specific implementation, the height H should be preferably above 3m, preferably above 4.2m; the width D should be preferably below 0.415m; the horizontal projection spacing K should be preferably above 0.5m, preferably above 1m; D / K≤0.25, preferably the golden ratio of D / K≤0.15.

[0013] 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 forest land that does not care about the yield, such as vegetable crops such as lettuce, lettuce, spinach, cabbage, mustard, celery, green forest, grassland, etc., the shading coefficient D / K can be appropriately increased, the spacing K can be reduced, and the width D can be increased.

[0014] Also preferably, the artificial rainfall irrigation power generation system is characterized in that: the water pipe is covered with a photovoltaic cell layer and a transparent protective layer thereof, and irrigation / cooling water flows in the water pipe.

[0015] Also preferred is the artificial rainfall irrigation power generation system, which is characterized by: water pipes and (cylindrical or flat) photovoltaic cell (narrow and long) strips and (preferably one rather than multiple) load-bearing cables arranged in the same direction as the water pipes, as well as irrigation nozzles and other components, which are combined together to form a linear water pipe photovoltaic assembly that can both receive sunlight to generate electricity and transport water to farmland (and can do it as evenly as artificial rainfall) for irrigation, with both ends of the assembly being hung on tall supports.

[0016] It is desirable to allow the water sprayed from the water pipe photovoltaic module to wet or flush the transparent protective layer of the photovoltaic cell to cool it and clean it, thereby improving the power generation efficiency.

[0017] The load-bearing cables mentioned in the present application generally refer to linear objects that can support photovoltaic panels through tensioning, including ropes, steel cables, chains, linear objects formed by connecting multiple sections of rods or tubes or profiles, etc.

[0018] Compared with the prior art, the present application has the following beneficial technical effects.

[0019] First, clever combination: The core of the artificial rainfall irrigation power generation system lies in its unique innovative design concept - the clever combination of photovoltaic power generation system and agricultural irrigation system, so that the two share space, load-bearing cables, and supports, and can be constructed once, cooled and cleaned at the same time, forming a new energy production model. While achieving precise and efficient irrigation, it can collect solar energy for power generation, thus forming a dual technical effect of irrigation and power generation, and can subsidize agriculture through photovoltaic power generation income, providing irrigation, fertilization, and pesticide spraying services for agriculture.

[0020] Second, harmonious coexistence: The shading rate of the artificial rainfall irrigation power generation system can be strictly controlled within a predetermined range, ensuring that the vegetation below can carry out photosynthesis normally, thus achieving harmonious coexistence of photovoltaic power generation and ecological protection.

[0021] Third, it does not occupy land: the artificial rainfall irrigation power generation system only uses the space above farmland or forests, does not occupy the actual land area, avoids the occupation and destruction of farmland resources, and ensures food security and ecological security.

[0022] Fourth, local power generation: artificial rainfall irrigation power generation systems can be built nearby in the central and eastern regions, reducing the need for long-distance power transmission, reducing power transmission losses and costs, and improving energy efficiency. It not only solves the contradiction between photovoltaic power generation and land use, but also provides a new solution for energy structure optimization and ecological environmental protection in the central and eastern regions.

[0023] Fifth, intermittent illumination can increase production and income: Because the water tube photovoltaic modules can be oriented north-south, can be very narrow and high, and the ratio of height between them can be very small, the shadows of multiple adjacent water tube photovoltaic modules can (without power / automatic and fast) take turns to block the sunlight as the sun moves, so that crops can get intermittent illumination, thereby stimulating crop growth and increasing crop yields. In this way, it will not only not affect photosynthesis, but also promote crop growth and increase yields. The applicant once asked the AI ​​big model "Mr. Mou Yiyan" such a question: I have done many experiments, blocking 3-5 minutes of sunlight every 20 minutes every day, so that intermittent illumination can stimulate the growth of pitaya and increase yields. Why? The answers are as follows: 1. As a plant, pitaya depends on the energy and nutrients produced by photosynthesis for its growth. However, long-term illumination may lead to excessive accumulation of photosynthesis products, affecting the normal respiration, and thus affecting the overall metabolic balance of the plant. Intermittent lighting may help regulate the balance between photosynthesis and respiration, allowing plants to accumulate energy and nutrients during the light period and perform necessary respiration during the shade period, thereby optimizing the growth state of the plant. 2. Light signal regulation. Light is not only a source of energy for photosynthesis, but also an important signal for plant growth and development. Intermittent lighting may simulate the changes in light intensity in nature, which are perceived by plants and converted into growth signals. Studies have shown that light signals can regulate physiological processes such as plant growth cycles, flowering time, and fruit development. Therefore, intermittent lighting may promote the growth and yield of pitaya by affecting the light signal transduction pathway. 3. Reduce photoinhibition and photodamage. Under strong light, the photosynthetic system of plants may be inhibited or damaged, resulting in a decrease in photosynthetic efficiency. Intermittent lighting can reduce the risk of plants being exposed to strong light for a long time and reduce the occurrence of photoinhibition and photodamage. This helps to protect the photosynthetic system of pitaya, allowing it to maintain a high photosynthetic efficiency, which is beneficial to plant growth and yield increase. 4. Experimental effect analysis: intermittent lighting may promote the growth of dragon fruit branches and leaf expansion by regulating the secretion of plant growth hormones and the rate of cell division. At the same time, a good growth state helps plants to better absorb and utilize nutrients, laying a solid foundation for flowering and fruiting. Light is one of the important factors affecting plant flowering and fruiting. Intermittent lighting may increase the flowering rate and fruit setting rate of dragon fruit by optimizing the light signal transduction pathway and promoting plant growth and development. In addition, a good growth state can also help improve the quality and yield of the fruit, making the dragon fruit fuller and sweeter. In summary, your experiment may promote the photosynthesis and growth and development balance of dragon fruit through intermittent lighting, thereby increasing its growth rate and yield. However, the specific effect needs to be further verified and analyzed based on factors such as experimental conditions and plant varieties. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a schematic diagram of an application of the photovoltaic rainfall irrigation power generation system above farmland in this application (Example 1).

[0025] Figure 2 for Figure 1 Schematic diagram of the horizontal projection cross-section structure of the water tube photovoltaic module.

[0026] Figure 3 for Figure 1 A schematic diagram of the structure of a water pipe photovoltaic module.

[0027] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the water tube photovoltaic module.

[0028] Figure 5 This is a schematic diagram of the structure of a water pipe photovoltaic assembly in the present application (Example 2).

[0029] Figure 6 This is another structural schematic diagram of a water pipe photovoltaic assembly in the present application (Example 3).

[0030] Explanation of the accompanying figures: 1-water pipe photovoltaic module, 2-load-bearing cable, 3-photovoltaic cell, 4-transparent protective layer, 5-thickening layer, 6-high support, 601-supporting beam (or supporting cable), 7-crop, 8-farmland, 9-shadow, 10-water pipe, 11-sprayed water, 12-hanging parts, 13-light, 14-sun, 15-agricultural machinery. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of this application, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. It should also be noted that, for the convenience of description, this application defines the length direction of the water tube photovoltaic module as the longitudinal direction, and the direction perpendicular to it as the lateral direction or left and right.

[0033] 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.

[0034] Embodiment 1.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, thousands of water tube photovoltaic modules 1 are installed in the north-south direction, 3-15 meters above the ground and 1-2 meters apart, over a farmland 8 of thousands of mu (such as a wheat field, a vegetable field, a corn field, or an orchard).

[0036] The first step is to wrap a circle (in other words, lay a layer of photovoltaic cells in the 360° angle range around the load-bearing cable 2) with a photovoltaic cell 3, preferably a thin-film photovoltaic cell as the photovoltaic cell 3, on a steel strand-type load-bearing cable 2 and an irrigation water pipe 10 (preferably a high tensile strength of more than 1200 MPa), such as a 15.2×3 galvanized prestressed steel strand, a high-strength fiber rope, a carbon fiber cable, a aramid cable, a glass fiber cable, a steel wire rope, a lightweight pipe, etc. (special) load-bearing cable 2 and an irrigation water pipe 10, thereby making a (a load-bearing cable 2 and an irrigation water pipe built-in) water pipe photovoltaic module 1. Thin-film photovoltaic cells (also called thin-film solar cells) are very flexible photovoltaic cells that can be cut into various shapes and sizes, and common shapes include long strips, circles, and even complex curved shapes. The patented "thin-film battery assembly, perovskite battery assembly and photovoltaic system (CN117295349A)", as well as CIGS thin-film solar cells, have all been mass-produced and are mature commercial products, so I will not go into details here. When implementing it, you can order it from its manufacturer. It is worth looking forward to that "Nature" published the latest scientific research results "thinner than A4 paper" high-toughness high-power solar cells have been manufactured. The battery can be rolled at will, and is particularly suitable for encapsulating the water pipe photovoltaic assembly 1 in the present invention. When implementing it, you can order it from its manufacturer.

[0037] In the second step, a transparent protective layer 4 is coated on the photovoltaic cell layer 3. For example, a transparent outer coat such as the transparent protective layer 4 is made of polytetrafluoroethylene material. The polytetrafluoroethylene material has excellent properties such as corrosion resistance, wear resistance, and high toughness. It can not only protect the photovoltaic cell assembly and receive light, but also has flexibility and can be bent, which helps to achieve the bending of the cell assembly. This polytetrafluoroethylene film is also a mature commercial product and will not be described here. When needed, it can be ordered or purchased from the relevant manufacturer.

[0038] The third step is to make a water tube photovoltaic assembly 1 with a width dimension of D (i.e., a diameter of 100 mm) (i.e., a diameter of 100 mm) with all cylindrical surfaces able to receive light, and no matter how the water tube photovoltaic assembly 1 vibrates in the wind (how it twists, shakes, or moves around), there are always 3 layers of photovoltaic cells facing the sun 14 that can receive light to generate electricity, i.e., a (perfect circular) cylindrical cell assembly. In this way, a water tube photovoltaic assembly 1 with a buried water pipe in the shape of a cable is packaged; the water tube photovoltaic assembly 1 includes at least (one dedicated) load-bearing cable 2 and 3 layers of photovoltaic cells and a transparent protective layer 4 surrounding the (dedicated) load-bearing cable 2 at 360° from the inside to the outside. There is no problem that the angle of incidence of sunlight will fluctuate due to the movement of the water tube photovoltaic assembly 1. The cross-section of the water tube photovoltaic assembly 1 is preferably as follows: Figure 4 The cross section can also be (but not recommended) elliptical, triangular, square, polygonal (close to a circle), etc.; wherein D≤30mm or 50mm or 100mm or 200mm or 300mm or 415mm or any other suitable width dimension; the optimal dimension D is 100mm to 200mm.

[0039] It should be noted that the research found that only the electricity generated by the water tube photovoltaic module 1 (i.e., the cylindrical battery module) with a perfect circular cross section has the most stable output voltage and current, and will not generate unstable voltage and current due to the twisting and wind vibration (including shaking, swinging and other fluctuations) of the water tube photovoltaic module 1 by the wind, and can deliver stable current to the power grid. The reason is that the amount of light received by the cylindrical surface water tube photovoltaic module 1 will not fluctuate due to shaking and other disturbances. On the contrary, if the water tube photovoltaic module 1 with a non-perfect circular cross section such as an elliptical, triangular, square, flat, polygonal, etc. is used, when the water tube photovoltaic module 1 is blown by the wind, it will cause the problem of the sunlight incident angle fluctuating. The electricity generated will inevitably be accompanied by the wind vibration (swaying, swinging) of the water tube photovoltaic module 1, and the voltage and current will fluctuate accordingly, which will inevitably be difficult to transmit and use. It can be seen from this that in specific implementation, it is strongly recommended to use a water tube photovoltaic module 1 with a cross section close to a perfect circle, and it is not recommended to use a water tube photovoltaic module 1 with a cross section that is not a perfect circle.

[0040] Of course, the water pipe photovoltaic assembly 1 with a non-circular cross section such as a triangle, square, polygon, etc. is not completely unusable and can still be used in some scenarios. For example, when the span L is a very small size such as 10-20m, the inclination angle of a certain photovoltaic cell 3 layer on the water pipe photovoltaic assembly 1 can be manually set to the optimal inclination angle so that it will not change due to the influence of wind, etc., so as to be used for power generation in a small span L scenario. In other words, in a large span L scenario, it is impossible to manually adjust and fix the orientation of the water pipe photovoltaic assembly 1, and it is not appropriate to use a non-circular water pipe photovoltaic assembly 1.

[0041] On the other hand, the water tube photovoltaic module 1 with a perfect circular cross section will not generate torque on the water tube photovoltaic module 1 due to its axisymmetric structure even if the wind is strong, so it will only swing and shake at a low frequency. In this way, the water tube photovoltaic module 1 will be very durable, and can be guaranteed to be free of fatigue, aging, and breakage for 25 years, and the current generated will be stable and easy to use.

[0042] In comparison, the current cable-structured flexible photovoltaic support technology uses two (special) load-bearing cables and one stabilizing cable to support a two-dimensional planar photovoltaic panel. When the planar photovoltaic panel is subjected to wind from all directions at high altitude, torque will inevitably be formed, causing it to be easy to twist, easy to vibrate, the incident angle of sunlight fluctuates, and the instantaneous current (current) fluctuations are large. In short, only the water pipe photovoltaic module with a perfect circular cross-section 1 can overcome the many defects of difficult high-altitude erection, high installation cost, difficult cleaning and maintenance, short service life, easy to twist / wind vibration, large power generation fluctuations, and difficulty in low-cost mining of the abundant solar energy resources above farmland 8.

[0043] In the fourth step, the numerous water tube photovoltaic modules 1 made in the previous steps are hung horizontally over the farmland 8 through high-rise supports 6 such as support columns or cable towers (similar to electric towers / poles) higher than 3-15 meters, arranged in intervals like erecting high-voltage transmission lines, so as to form an array of water tube photovoltaic modules 1. The height H of the water tube photovoltaic module 1 from the ground surface can be set to 2 meters, the span L of a single span of the water tube photovoltaic module 1 can be set to 200-300 meters, and the distance K between the horizontal projections of the water tube photovoltaic module 1 (in the farmland 8) is preferably set to 1-2 meters. For example, H can be set to ≥ 5m or 10m. In short, the height H should be high enough to ensure that the top of the crop 7 does not touch the water tube photovoltaic module 1. L can also be set to ≥ 10m or 20m or 50m or 100m or 500m or 1000m. In short, the span L should be large enough to reduce the number of high-rise supports 6, reduce the area occupied by pile foundations, and avoid serious obstruction of the operation of large agricultural machinery 15. It is best to make K ≥ 1m or 2m or 3m or 5m or 10m. In short, the (thickness and) shadow 9 width of the water tube photovoltaic module 1 should be appropriately reduced to ensure the light needs of crop 7 growth to a minimum and avoid production reduction due to insufficient light.

[0044] In order to reduce the number of pile foundations such as supporting columns, save floor space, and ensure that the water pipe photovoltaic assembly 1 can be installed along the north-south direction, in the specific implementation, the supporting beam 601 in the towering support 6 may not be a rigid beam, but a flexible beam, such as a very thick steel cable (not shown in the figure).

[0045] It should be noted that, in the specific implementation, the width dimension D of the water tube photovoltaic assembly 1 should be appropriately reduced, and the horizontal spacing K of the water tube photovoltaic assembly 1 should be appropriately increased, so as to ensure that the ratio D / K of the width dimension D of the water tube photovoltaic assembly 1 and the spacing K of the horizontal projection of the water tube photovoltaic assembly 1 (in the farmland 8) is ≤ 0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.20 or 0.30 or 0.5 or 1 or 2 or 3, so that the shadow 9 of the same water tube photovoltaic assembly 1 can quickly (for example, within 5 minutes) pass through the same crop 7 (preferably move a distance of 1 width dimension D within 5 minutes) as the sun 14 moves, so as to avoid the same crop 7 staying in the shadow 9 of the same water tube photovoltaic assembly 1 for a long time (for example, more than 30 minutes) to reduce photosynthesis and avoid causing a reduction in crop 7 yield. Studies have found that the length of time that the shadow 9 stays on (i.e. covers) the same crop 7 is inversely proportional to H and directly proportional to D. It can be seen that in order to reduce the impact of shadows 9 and uneven lighting on the growth of crops 7, the hanging height and H of the water tube photovoltaic assembly 1 should be increased as much as possible, and the width of the water tube photovoltaic assembly 1 should be reduced as much as possible. It is best to select H as 3-5m and the width D as 10-20cm.

[0046] Preferably, in order to ensure that the distance K between the horizontal projections (i.e., shadows 9) of the water pipe photovoltaic modules 1 in the farmland 8 is relatively small, and at the same time to avoid collisions when they swing left and right greatly due to strong winds, a three-dimensional installation method with high and low dislocations can be adopted to stagger them.

[0047] It is also preferred that in order to set up 3 layers of photovoltaic cells with as large an area as possible within a unit length of the water pipe photovoltaic module 1 to reduce the cost per kilowatt-hour, some thickened fillers 5 (for example, thickened fillers with good thermal conductivity) can be filled between the (special) load-bearing cables 2 and the 3 layers of photovoltaic cells. By increasing the thickness of the water pipe photovoltaic module 1, the area where the 3 layers of photovoltaic cells can be set is expanded, thereby greatly increasing the light-receiving area per unit length of the water pipe photovoltaic module 1 and reducing the power generation cost per unit length.

[0048] Fortunately, the flowing water in the water pipe 10 will take away the heat of the photovoltaic cell 3 to cool it down, thereby improving the power generation efficiency.

[0049] Embodiment 2.

[0050] like Figure 5As shown, the irrigation water pipe 10 in the water pipe photovoltaic assembly 1 in the above example 1 is placed externally, and the irrigation water pipe 10 is hung on a load-bearing cable 2 by a hanging piece 12, and a series of cylindrical photovoltaic cell assemblies 3 are hung on the load-bearing cable 2. In this way, a cylindrical water pipe photovoltaic assembly 1 is formed, which is hung horizontally above the farmland 8 in an interval arrangement like erecting a high-voltage transmission line through a 3-15 meter high support column or cable tower (similar to a power tower / pole), and can form a water pipe photovoltaic assembly 1 array with the same use effect as the above example.

[0051] Embodiment three.

[0052] like Figure 6 As shown, the irrigation water pipe 10 in the water pipe photovoltaic assembly 1 in the above examples 1 and 2 is placed externally, and the irrigation water pipe 10 is hung on a load-bearing cable 2 by a hanging member 12, and some narrow strip photovoltaic cell 3 assemblies are hung on the load-bearing cable 2. In this way, a narrow strip water pipe photovoltaic assembly 1 is formed, which is hung horizontally over the farmland 8 in an interval arrangement like erecting a high-voltage transmission line through a 3-15 meter high support column or cable tower (similar to a power tower / pole), and another water pipe photovoltaic assembly 1 array with the same use effect as in the above examples 1 and 2 can be formed.

[0053] It is desirable that the water 11 sprayed from the water-tube photovoltaic assembly 1 wets or flushes the transparent protective layer 4 of the narrow-strip photovoltaic cell 3 to cool it and clean it, thereby improving the power generation efficiency.

[0054] 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. An artificial rainfall irrigation power generation system, It is characterized in that It includes: ① Irrigation water pipes and photovoltaic cell modules for power generation, which are combined into a narrow and long water pipe photovoltaic module that can both receive sunlight to generate electricity and transport water to farmland for irrigation; ② The water tube photovoltaic module array arranged at intervals on the towering supports and hung horizontally above the farmland through the load-bearing cables; the width of the water tube photovoltaic module is D, the height is H, the span is L, and the horizontal projection spacing is K; among which, D is less than the set width dimension, 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 water tube photovoltaic module on the ground, including the horizontal projection; the ratio of the width D of the water tube photovoltaic module to the spacing K of its horizontal projection - the shading coefficient D / K is less than the set coefficient value, and the spacing height ratio K / H is less than the set coefficient value.

2. The artificial rainfall irrigation power generation system according to claim 1, It is characterized in that It includes the following a 1 to a 9 Medium or b 1 To b 8 Medium or c 1 to c 6 In or e 1 To e 7 Medium or f 1 to f 11 Medium or g 1 tog 5 Any one of the following technical features: a 1 D≤10mm、a 2 D≤20mm、a 3 D≤30mm、a 4 D≤50mm、a 5 D≤100mm、a 6 D≤235mm、a 7 D≤322mm、a 8 D≤415mm、a 9 D≤1280mm; b 1 H≥1m、b 2 H≥2m、b 3 H≥3m、b 4 H≥5m、b 5 H≥10m、b 6 H≥20m、b 7 H≥30m、b 8 H≥50m; c 1 L≥10m、c 2 L≥20m、c 3 L≥50m、c 4 L≥80m、c 5 L≥150m、c 6 L≥500m; yes 1 K≥0.2m、e 2 K≥0.5m、e 3 K≥1、e 4 K≥2m、e 5 K≥3m、e 6 K≥5m、e 7 K≥10m; f 1 D / K≤0.01、f 2 D / K≤0.02、f 3 D / K≤0.03、f 4 D / K≤0.05、f 5 D / K≤0.1、f 6 D / K≤0.2、f 7 D / K≤0.3、f 8 D / K≤0.5、f 9 D / K≤1、f 10 D / K≤2、f 11 D / K≤3; g 1 K / H≤0.1、g 2 K / H≤0.5、g 3 K / H≤1、g 4 K / H≤2、g 5 K / H≤5。 3. The artificial rainfall irrigation power generation system according to claim 1, Features: The midday shadow of the water tube photovoltaic module moves a distance of one midday shadow width every 1-20 minutes or every 1-5 minutes; or, the midday shadow of the water tube photovoltaic module moves a distance of one midday shadow width for no more than 30 minutes.

4. The artificial rainfall irrigation power generation system according to claim 1, 2 or 3, Features: The shadows of multiple adjacent water pipe photovoltaic modules continuously block, release, block again, and release again to provide intermittent illumination to the crops; the crops are exposed to sunlight multiple times, for a long time, and intermittently every day to stimulate crop growth and increase crop yields.

5. The artificial rainfall irrigation power generation system according to claim 1, 2 or 3, Features: The water pipe is covered with a photovoltaic cell layer and a transparent protective layer, and irrigation / cooling water flows in the water pipe.

6. The artificial rainfall irrigation power generation system according to claim 1, 2 or 3, Features: The water pipe, the photovoltaic cell strips and load-bearing cables arranged in the same direction as it, and the irrigation nozzles are combined together to form a linear water pipe photovoltaic module, which can both receive sunlight to generate electricity and supply water to the farmland for irrigation, with both ends hung on tall supports.

7. The artificial rainfall irrigation power generation system according to claim 1, 2 or 3, Features: The water sprayed from the photovoltaic modules by the water pipe wets / washes the transparent protective layer of the photovoltaic cells.

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