Winter inter-row dynamic light supplementing device based on agricultural light complementation
By designing a dynamic supplemental lighting device, and utilizing a roll system and reflective film to adjust sunlight reflection, the problem of insufficient sunlight for crops in the photovoltaic panel shading area was solved, the crop growth environment was improved, facility costs and wind resistance were reduced, and the service life of the reflective film was extended.
Patent Information
- Application Number
- CN202522620933.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-10
AI Technical Summary
The existing row layout of photovoltaic panels results in insufficient sunlight and low ground temperature for crops in the shaded areas between rows during winter, which affects crop growth. Existing supplemental lighting facilities have poor compatibility, high cost, and cannot adapt to changes in the sun's trajectory.
Design a dynamic supplementary lighting device for winter between rows based on agricultural-solar complementary systems, including a roll system, reflective film, angle adjustment system, ground anchor, ring buckle and traction rope. These components enable the roll-up and angle adjustment of the reflective film. Combined with polyester aluminized film material, it improves light reflection and wind resistance.
It effectively increases the photosynthetically active radiation and ground temperature of crops between rows in winter, enhances the stability and service life of reflective film, reduces wind resistance and losses, and improves economic benefits.
Smart Images
Figure CN224924337U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural-solar complementary technology, specifically to a dynamic supplementary lighting device for inter-row lighting in winter based on agricultural-solar complementary technology. Background Technology
[0002] In the field of photovoltaic-agricultural hybrid technology, the dynamic shading between rows caused by the arrangement of photovoltaic panels is a pressing issue that needs to be addressed. The installation of photovoltaic panels blocks sunlight needed for crop production, thus reducing crop yields; however, shading reduces transpiration and may improve water use efficiency. The key is to find a balance between photovoltaic power generation and crop production.
[0003] In recent years, photovoltaic agriculture, through its integration with agriculture, has enabled both solar power generation and crop cultivation, especially given the scarcity of arable land. However, with the rapid development of the photovoltaic industry, the low solar altitude angle (<30°) in northern winters creates a continuous shading zone due to the arrangement of photovoltaic panels. This causes the inter-row PAR value to drop below the crop light compensation point, resulting in surface temperatures remaining below freezing, snow accumulation exceeding 30 days, and a winter rapeseed frost mortality rate exceeding 60%. In a typical agro-photovoltaic complementary scenario, such as the Dali Photovoltaic Park in Shaanxi Province, photovoltaic panels are installed at a 17° southward tilt, forming a layout with a front eave height of 2.2m and a rear eave height of 3.5m, with a column spacing of 10.15m. This structure results in a winter shading zone as long as 6.2m, with shading lasting over 9 hours, and a measured noon photosynthetically active radiation value of only 70μmol / m². How to increase the photosynthetically active radiation required by crops in the winter shading zone between photovoltaic panels while ensuring ground temperature improvement has become an urgent problem to be solved.
[0004] While there is some research and practice on existing technologies for addressing lighting issues and implementing agricultural-solar complementary models, these technologies often have some shortcomings. For example, some supplemental lighting structures have poor compatibility with different crops; some supplemental lighting facilities have complex structures, high costs, and low cost-effectiveness; traditional fixed reflective devices cannot adapt to changes in the sun's trajectory and are prone to damage due to high wind resistance; and devices that dynamically match changes in the sun's altitude angle are only used for photovoltaic panels to improve their power generation efficiency, and have not been applied in conjunction with supplemental lighting and heating systems in crop areas.
[0005] Specifically, in existing photovoltaic (PV) panel and crop cultivation models, there are methods such as planting shade-loving crops under PV panels and laying reflective film in the inter-row farmland. These methods can achieve good results under suitable soil conditions, climate conditions, and crop cultivation techniques. However, most PV panels are installed in relatively poor environmental conditions, and crops are limited by soil and climate conditions, and are affected by the sunlight and temperature of the PV panels. These methods often cannot meet the growth needs of crops in the inter-row shaded areas during winter, and crops may suffer from frost damage in winter. At the same time, traditional cultivation and supplemental lighting are not cost-effective, leading to the abandonment of PV-covered farmland and resulting in the abandonment of PV land.
[0006] In summary, existing photovoltaic panel shading area supplementary lighting technologies have many shortcomings and cannot meet the needs of crop supplementary lighting and soil insulation in winter in the shading areas between panels under the agricultural-photovoltaic complementary model. Utility Model Content
[0007] To address the technical problems in the existing technology, this utility model provides a dynamic supplementary lighting device for winter between rows based on agricultural photovoltaic complementarity, including a roller system and a reflective film installed on the front eaves of the photovoltaic panel. One end of the reflective film is fixedly connected to the roller system and is wound or unwound with the roller system. The other end is connected to an angle adjustment system, and the angle of unwound film is adjusted by the angle adjustment system and fixedly connected to the ground.
[0008] Furthermore, the angle adjustment system includes a ground anchor, a ring, and a traction rope. The ground anchor is detachably connected to the ground, and the ring is fixedly connected to the reflective film via the traction rope. The ring cooperates with the ground anchor.
[0009] Furthermore, the ring buckle has a toothed structure inside, which cooperates with the ground anchor.
[0010] Furthermore, the traction rope is located at the middle of the end of the reflective film.
[0011] Furthermore, a counterweight system is provided at the end of the reflective film away from the roll system, and the counterweight system is located above the angle adjustment system.
[0012] Furthermore, the counterweight system includes a counterweight bar loaded with lead pellets, the length of which is not less than the width of the reflective film.
[0013] Furthermore, the reflective film is made of polyester aluminized film with a thickness of 0.6 mm, a pore size of 3 mm ± 0.5 mm, and a density of 25 pores / ㎡.
[0014] Beneficial effects: 1. In this utility model, the setting of the roll system, reflective film and angle adjustment system can avoid the shadow area of the photovoltaic panel and reflect sunlight to the crops between the rows of photovoltaic panels in winter. At the same time, the length and angle of the reflective film can be flexibly adjusted according to the solar altitude angle and the required light, which solves the defect that the fixed tilt reflective film cannot track the sun's trajectory. In addition, the reflective film can be rolled up when not in use to reduce wind resistance and loss.
[0015] 2. In this utility model, the use of ground anchors, rings, and traction ropes allows for convenient and quick installation and fixation of the adjusted angle. Specifically, the ground anchor can be driven into the ground at the preset angle position, and then the reflective film can be pulled down using the rings and traction ropes to unfold it. The rings can then be connected to the ground anchors. Alternatively, the rings can be connected to the ground anchors first, then the reflective film can be pulled down to unfold it, and finally the ground anchors can be driven into the ground. The toothed structure increases the frictional resistance between the rings and the ground anchors, improving the stability of their connection. The traction rope's placement at the middle of the end of the reflective film ensures its flatness during suspension and enhances light reflection.
[0016] 3. In this utility model, the counterweight system can improve the flatness of the reflective film when it is suspended, further enhance the light reflection, and improve the wind resistance to prevent the reflective film from swaying. Combined with the counterweight strip with lead pellets, it can be installed easily and the occupied area can be minimized while ensuring the counterweight.
[0017] 4. In this utility model, by using a polyester aluminized film with a thickness of 0.6mm, a pore size of 3mm±0.5mm, and a density of 25 pores / ㎡, it is possible to achieve supplemental lighting and warming effects, while also increasing its flatness and wind resistance, extending the service life of the reflective film, and improving economic benefits. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a side view of the overall structure of this utility model; Figure 2 This is a front view of the overall structure of this utility model; Figure 3 This is a comparison diagram of the effects of light radiation and ground temperature at different spacings between rows of this utility model and a non-reflective photovoltaic panel. Figure 4 This is a comparison diagram showing the dynamic impact of different spacing between rows of the present invention on the photosynthetically effective radiation of a photovoltaic panel without reflective film. Figure 5 This is a comparison diagram showing the dynamic impact of different distances between rows of this utility model and a photovoltaic panel without reflective film on ground temperature.
[0020] Explanation of reference numerals in the attached figures: 1. Photovoltaic panel; 2. Roll system; 3. Reflective film; 4. Counterweight system; 5. Ground anchor; 6. Ring buckle; 7. Traction rope. Detailed Implementation
[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0027] Example 1 This utility model provides a dynamic inter-row supplemental lighting device for winter based on agricultural-solar complementary systems, such as... Figure 1 and Figure 2 As shown, the system includes a roller system 2 and a reflective film 3 installed on the front eaves of the photovoltaic panel 1. One end of the reflective film 3 is fixedly connected to the roller system 2 and is wound or unwound with the roller system 2. The other end is connected to an angle adjustment system, and the unwound angle is adjusted by the angle adjustment system and fixedly connected to the ground. The unwound angle range is 60° to 90°. The roller system 2 includes a roller frame and a roller fixed to the front eaves of the photovoltaic panel 1. Both ends of the roller are rotatably connected to the roller frame through bearings. One end of the reflective film 3 is fixedly wound on the roller. In actual use, the winding and unwinding of the reflective film 3 can be controlled manually or mechanically.
[0028] In this embodiment, the roller system 2, reflective film 3, and angle adjustment system can avoid the shadow area of photovoltaic panel 1 and reflect sunlight onto crops between rows of photovoltaic panel 1 in winter. At the same time, the length and angle of reflective film 3 can be flexibly adjusted according to the solar altitude angle and the required light intensity, solving the defect that fixed tilt reflective film 3 cannot track the sun's trajectory. In addition, reflective film 3 can be rolled up when not in use to reduce wind resistance and loss.
[0029] In this utility model, preferably, such as Figure 1 and Figure 2As shown, the angle adjustment system includes a ground anchor 5, a ring buckle 6, and a traction rope 7. The ground anchor 5 is detachably connected to the ground. The ring buckle 6 is fixedly connected to the reflective film 3 through the traction rope 7. The ring buckle 6 cooperates with the ground anchor 5. The ring buckle 6 has a toothed structure inside, and the toothed structure cooperates with the ground anchor 5.
[0030] In this embodiment, the ground anchor 5, the ring buckle 6, and the traction rope 7 allow for convenient and quick installation and fixation of the adjusted angle. Specifically, the ground anchor 5 can be driven into the ground at a preset angle position. Then, the reflective film 3 is pulled down using the ring buckle 6 and the traction rope 7 to unfold it, and the ring buckle 6 is connected to the ground anchor 5. Alternatively, the ring buckle 6 can be connected to the ground anchor 5 first, then the reflective film 3 is pulled down to unfold it, and the ground anchor 5 is driven into the ground. The toothed structure increases the frictional resistance between the ring buckle 6 and the ground anchor 5, improving the stability of their connection.
[0031] In this utility model, preferably, such as Figure 1 and Figure 2 As shown, the traction rope 7 is located at the middle of the end of the reflective film 3.
[0032] In this embodiment, by positioning the traction rope 7 at the middle of the end of the reflective film 3, the flatness of the reflective film 3 when suspended can be ensured, and the reflection of light can be enhanced.
[0033] In this utility model, preferably, such as Figure 1 and Figure 2 As shown, the reflective film 3 is further provided with a counterweight system 4 at the end away from the roll system 2. The counterweight system 4 is located above the angle adjustment system. The counterweight system 4 includes a counterweight bar loaded with lead pellets. The length of the counterweight bar is not less than the width of the reflective film 3.
[0034] In this embodiment, the counterweight system 4 can improve the flatness of the reflective film 3 when it is suspended, further enhance the reflection of light, and improve wind resistance to prevent the reflective film 3 from swaying. Combined with the counterweight strip with lead pellets, it can be installed easily and the occupied area can be minimized while ensuring the counterweight.
[0035] In this utility model, preferably, such as Figure 1 and Figure 2 As shown, the reflective film 3 is made of polyester aluminized film with a thickness of 0.6 mm, a pore size of 3 mm ± 0.5 mm, and a density of 25 pores / ㎡.
[0036] In this embodiment, by using a polyester aluminized film with a thickness of 0.6 mm, a pore size of 3 mm ± 0.5 mm, and a density of 25 pores / ㎡, it is possible to achieve supplemental lighting and warming effects, while also increasing its flatness and wind resistance, extending the service life of the reflective film 3, and improving economic efficiency.
[0037] Example 2 like Figures 1 to 5 As shown, a field trial was conducted for Example 1, and the trial results are as follows: a. Experimental process The study area is located in Renxi Village, Dali County, Weinan City, Shaanxi Province, with geographical coordinates of longitude 109.941658 and latitude 34.797184, between 34°36′ and 35°02′ north latitude and 109°43′ and 110°19′ east longitude. The annual precipitation is 514 mm. Dali County is located in the eastern part of the Guanzhong Plain and belongs to the temperate semi-arid continental monsoon region. The average annual sunshine duration is 2385.2 hours, the average annual solar radiation is 526.4 kJ / cm2, the average temperature is 13.4℃, the annual precipitation is 514 mm, and the frost-free period is 212 days. The soil type is sandy soil with unique physicochemical properties: the soil pH is 8.19, slightly alkaline; the organic carbon content is low, at 8.89 g / kg; the total nitrogen content, nitrate nitrogen content, and ammonium nitrogen content are 0.31 g / kg, 3.87 μg / g, and 4.91 μg / g, respectively; the available phosphorus and available potassium contents are 4.96 mg / kg and 45.96 mg / kg, respectively; the soil moisture content is 9%; the soil bulk density is 1.49 g / cm3; and the soil field holding capacity is 20.88%.
[0038] The experiment was conducted on April 3, 2025. The supplementary lighting device was installed in the manner described above. The reflective film 3 was fixed at a 90° angle to the ground. The inter-row supplementary lighting test was carried out. There were two cases of reflective film 3: no reflective film 3 and reflective film 3 installed at a 90° angle. Ground thermometers were set at positions 1m, 2m and 3m away from the reflective film 3 in the rows. Three repeated test points were set for each reflective film 3 condition and distance. From 9:00 am to 5:00 pm, the soil temperature and photosynthetically active radiation data were recorded once per hour.
[0039] b. Experimental Results The data on daily ground temperature and photosynthetically active radiation were compiled and analyzed, and the results are as follows: Figure 3 , Figure 4 and Figure 5 As shown.
[0040] Depend on Figure 3The results showed that, without the reflective film 3, the light and effective radiation values at the three measuring points 1 m, 2 m, and 3 m away from the reflective film 3 decreased with increasing distance, reflecting the significant impact of shading by the photovoltaic panel 1 on inter-row illumination. After suspending the reflective film 3 at a 90° angle, the PAR value at 1 m increased significantly, with an increase of 18.9%; the increase at 2 m was 3.4%, while the increase at 3 m was only 0.7%. The results indicate that when the reflective film 3 is at a 90° angle to the ground, the near-end supplemental lighting effect is extremely significant, but as the distance increases, the energy of the reflected light decays rapidly, approaching the level of no film at 3 m.
[0041] Without reflective film 3, the surface temperatures at the three measuring points were 20.4℃, 20.4℃, and 21.0℃, respectively, with little difference, indicating that the soil temperature distribution between rows was relatively uniform but generally low without supplemental lighting. Reflective film 3 significantly altered the surface temperature distribution. At 1m, the soil temperature rose to 30.8℃, an increase of 10.4℃ compared to without the film, indicating that reflective film 3 significantly increased the soil temperature near the film by enhancing radiative energy input; at 2m, the soil temperature was 21.6℃, an increase of 1.2℃, with the warming effect significantly weakened; at 3m, the soil temperature actually dropped to 19.1℃, 1.9℃ lower than without the film, possibly related to changes in the angle of reflected light and energy attenuation, or even localized cooling due to shading of reflected light.
[0042] Depend on Figure 4 The results showed that the diurnal variation of PAR exhibited a single-peak curve under both conditions with and without reflective film 3, with the peak value occurring around 13:00. Reflective film 3 increased the PAR peak value at 1m by 23.3%, while the increases at 2m and 3m were smaller, at 6.0% and 2.5% respectively. This indicates that when reflective film 3 is at a 90° angle to the ground, its effect on enhancing radiation at the near end (≤2m) is more significant.
[0043] Depend on Figure 5 The results showed that without the reflective film, the daily variation of ground temperature exhibited an asymmetrical single-peak curve, with the peak occurring at 15:00. The reflective film 3 significantly increased the ground temperature at 1m throughout the day, especially from 12:00 to 15:00, with a temperature increase of 10.4–11.2℃, and the peak occurred earlier at 13:00, indicating that the reflected radiation energy was directly and rapidly converted into surface heat energy.
[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0045] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A dynamic inter-row supplemental lighting device for winter based on agricultural-solar complementary systems, characterized in that, It includes a roller system (2) installed on the front eaves of the photovoltaic panel (1) and a reflective film (3). One end of the reflective film (3) is fixedly connected to the roller system (2) and is wound up or unwound with the roller system (2). The other end is connected to an angle adjustment system, and the angle of unwound film is adjusted by the angle adjustment system and fixedly connected to the ground.
2. The dynamic inter-row supplementary lighting device based on agricultural-solar complementarity in winter as described in claim 1, characterized in that, The angle adjustment system includes a ground anchor (5), a ring (6) and a traction rope (7). The ground anchor (5) is detachably connected to the ground. The ring (6) is fixedly connected to the reflective film (3) through the traction rope (7). The ring (6) cooperates with the ground anchor (5).
3. The dynamic inter-row supplementary lighting device based on agricultural-solar complementarity in winter as described in claim 2, characterized in that, The ring (6) has a toothed structure inside, which cooperates with the ground anchor (5).
4. The dynamic inter-row supplementary lighting device based on agricultural-solar complementarity in winter as described in claim 3, characterized in that, The traction rope (7) is located at the middle of the end of the reflective film (3).
5. The dynamic inter-row supplementary lighting device based on agricultural-photovoltaic complementarity in winter as described in any one of claims 1 to 4, characterized in that, The reflective film (3) is further provided with a counterweight system (4) at the end away from the roll system (2), and the counterweight system (4) is located above the angle adjustment system.
6. The dynamic inter-row supplementary lighting device based on agricultural-solar complementarity in winter as described in claim 5, characterized in that, The counterweight system (4) includes a counterweight bar loaded with lead pellets, the length of which is not less than the width of the reflective film (3).
7. The dynamic inter-row supplemental lighting device based on agricultural-solar complementarity in winter as described in claim 1, characterized in that, The reflective film (3) is made of polyester aluminized film with a thickness of 0.6 mm, a pore size of 3 mm ± 0.5 mm, and a density of 25 pores / ㎡.