Vacuum reflective post ecological photovoltaic system

Abstract

This invention discloses a vacuum reflective pier ecological photovoltaic system, relating to the fields of photovoltaic power generation and agricultural-photovoltaic complementarity. The system includes a photovoltaic array with vacuum reflective piers on one or both sides of the photovoltaic panels. The vacuum reflective piers are made by filling airtight vacuum bags with sand, shaping them with a template, compacting them with vibration, and then sealing them under vacuum. The negative pressure inside the bag is maintained between -0.10 MPa and -0.006 MPa, forming a rigid, smooth surface through vacuum consolidation, covered with a reflective layer. The reflective layer reflects sunlight onto the light-receiving surface of the photovoltaic panels, increasing power generation. The space between the photovoltaic array and the reflective piers is designated as a planting area, achieving agricultural-photovoltaic complementarity. This invention utilizes locally sourced materials, has extremely low cost, a stable and wind-resistant structure, is easy to construct and maintain, and is suitable for various scenarios such as farmland and deserts, combining power generation gains with ecological restoration effects.

Description

Technical Field

[0001] This invention relates to the fields of photovoltaic power generation, agricultural photovoltaic complementarity and ecological restoration technology, specifically to the improvement and application expansion of the applicant's prior invention patent "T-type photovoltaic cable power generation system and T-type photovoltaic rod (CN119210278B)", which is a vacuum reflective pier ecological photovoltaic system that uses vacuum-consolidated sand to form a rigid pier for support, is equipped with a reflector to achieve photovoltaic reflection gain, and is compatible with ecological planting. Background Technology

[0002] The applicant's invention patent, "T-shaped photovoltaic cable power generation system and T-shaped photovoltaic rod (CN119210278B)," uses a side-mounted double-sided photovoltaic panel in conjunction with a flat-lying reflector (panel), enabling the double-sided photovoltaic panel to simultaneously receive direct and reflected light to generate electricity, significantly improving power generation efficiency. However, when this reflective technology is applied to ground-mounted power stations, it has been found that the cost of the reflector (panel) and its support is high, exceeding 0.60 yuan / W (hereinafter referred to as T-shaped reflector cost), resulting in poor overall economic benefits.

[0003] In existing technologies, patents such as CN106818334A, CN214337868U, and CN120191098A all employ a method of directly laying high-reflectivity ground film or aluminum-plastic reflective film on the ground below the photovoltaic array and fixing it with ground nails or soil covering. This method reflects sunlight to the back of the double-sided photovoltaic modules through ground diffuse reflection, thereby increasing power generation. However, this type of ground film-type reflectorless bracket fixing method has inherent defects: the reflective film is a flexible film, and it is difficult to form a flat reflective film after being laid flat. It is prone to wrinkles and bulges due to uneven ground and soil settlement; it has poor wind resistance and is easily lifted, blown, and slapped in strong winds, accelerating the wear and even tearing of the film; it cannot maintain a stable reflection angle, and it cannot form a reflector structure with the photovoltaic panel; the reflection is mainly diffuse reflection, and the light is scattered and cannot be accurately oriented to the photovoltaic panel.

[0004] Current conventional photovoltaic panels mainly utilize direct sunlight from the front, resulting in low utilization of side and ground-reflected light, limiting the potential for improving photoelectric conversion efficiency. Existing photovoltaic reflective enhancement devices mostly use metal brackets or concrete bases to support reflective components, which generally suffer from the following problems: high costs and complex procedures for concrete foundations and metal reflective brackets, transportation, and construction; potential damage to farmland and surface ecology; conflict with agricultural planting; and difficulty in achieving agricultural-photovoltaic complementarity. In desert, Gobi, and field settings, there is a lack of a low-cost, structurally stable, eco-friendly, and widely applicable reflective enhancement photovoltaic technology.

[0005] Therefore, the industry urgently needs a photovoltaic reflective gain system that is locally sourced, quick to construct, eco-friendly, structurally stable and reliable, and compatible with crop cultivation, in order to solve the bottleneck problems of high cost, poor stability, and difficulty in taking into account agricultural production of existing reflective gain photovoltaic power generation technologies. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a vacuum reflective pier ecological photovoltaic system. This system uses vacuum-consolidated sand to form a rigid pier, which achieves stability by its own weight. It supports a reflective layer to enhance photovoltaic reflection efficiency, while preserving surface planting space. This achieves a comprehensive effect of power generation gain, agricultural-photovoltaic complementarity, ecological soil stabilization, and low-cost construction.

[0007] To achieve the above objectives, the present invention adopts the following technical solution.

[0008] A vacuum reflective pier ecological photovoltaic system, comprising photovoltaic panels and a photovoltaic array composed of them, characterized in that: Vacuum soil blocks are provided on one or both sides of the photovoltaic panel; The vacuum soil mound includes an airtight vacuum bag and sand filling material inside the vacuum bag; The vacuum bag is shaped by a template, (preferably compacted by vibration), vacuumed, and sealed, with the negative pressure inside the bag maintained at -0.10MPa to -0.006MPa; The vacuum bag and sand are vacuum-consolidated to form a rigid vacuum mound with a smooth surface; The smooth surface of the vacuum mound is provided with a reflective layer to form a vacuum reflective mound; the reflective layer can be a reflective film, reflective foil, electroplating layer, coating layer, or mirror material, etc.; the reflective layer generally refers to thin reflective surface material, including but not limited to commercially available reflective surface materials such as aluminized film, aluminum foil, stainless steel foil, and reflective thin plates, etc. In this invention, the vacuum mound with a reflective layer is simply referred to as a vacuum reflective mound; The reflective layer is a mirror, a diffuse surface, or a reflective curved surface, used to reflect sunlight to the light-receiving surface of the photovoltaic panel; The ground area between the photovoltaic array and the vacuum reflector, or between adjacent vacuum reflectors, shall be designated as a crop planting area or a grass cultivation area.

[0009] Furthermore, the vacuum bag is provided with an exhaust port for venting air (i.e., expelling air from the bag) when filling with sand and for replenishing the vacuum after the vacuum level drops, so that the negative pressure inside the bag is maintained within the range of -0.10MPa to -0.06MPa; the sand is one or more of sand, gravel, and soil, and is compacted by vibration after filling.

[0010] Furthermore, the vacuum bag contains a desiccant and / or an insect repellent.

[0011] Furthermore, the photovoltaic panel is a double-sided photovoltaic panel with a double-sided ratio of 70% to 100%; the double-sided photovoltaic panel is vertically arranged and extends along the north-south direction, with the front and back facing east and west respectively; the vacuum reflector is set on the east and west sides of the double-sided photovoltaic panel, and the reflective layer is a reflective plane; the angle ∠β between the reflective plane and the photovoltaic panel surface is ≤90°.

[0012] Preferably, the included angle ∠β = 90° and the reflective plane is a mirror. This is because when ∠β = 90°, the mirror and the double-sided photovoltaic panel form a reflector structure, and almost all the light incident on the reflective plane is directionally reflected onto the photovoltaic panel. It is known that although clean snow has a reflectivity of over 80%, it is diffuse reflection, and the actual reflected light gain received by a vertically installed photovoltaic panel is only about 25% on average. The mirror described in this invention can accurately reflect more than 80% of the incident light onto the photovoltaic panel, thereby significantly increasing the amount of light received and the amount of power generated. This is the core reason why this invention prefers a mirror as the reflective plane.

[0013] Furthermore, the photovoltaic panel is tilted to the south; the vacuum reflector is located on the south side of the photovoltaic panel; the reflective layer is a reflective plane, and the angle ∠α between the reflective plane and the extension line of the photovoltaic panel is ≥90°.

[0014] Thicker objects are generally called piers, thinner objects are called slabs, and thin and small objects are called bricks. Therefore, the thinner vacuum soil piers can also be called vacuum soil slabs or vacuum soil bricks. The vacuum soil piers described in this application include vacuum soil slabs and vacuum soil bricks. Studies show that when using relatively thin vacuum soil slabs or vacuum soil bricks, the negative pressure inside the bag can be maintained at a smaller value, such as -0.06MPa to -0.006MPa; when using very thick vacuum soil piers (e.g., more than 500mm), the negative pressure inside the bag can be maintained at a larger value, such as -0.10MPa to -0.06MPa.

[0015] A comparison reveals that if a rigid vacuum soil mound is not prepared using a vacuum consolidation process, and the reflective film is simply laid on the ground like ordinary mulch and fixed with soil edges, a series of problems will arise, failing to meet the application requirements for photovoltaic reflective enhancement. Under this simple fixing method, the reflective film cannot form a flat and stable reflective surface. Affected by uneven ground, soil settlement, wind disturbance, and water washing, it is prone to deformation such as wrinkles, warping, pitting, and bulging. The uneven surface of the reflective film prevents directional reflection, resulting in chaotic scattering of incident sunlight, making it difficult to fully reflect it to the photovoltaic panel, significantly reducing the reflective gain effect. Furthermore, the simple soil-fixed reflective film has extremely poor wind resistance. In strong winds, the film is easily lifted, blown, and slapped, continuously damaging its flatness and accelerating wear and tear. The edges, in particular, are easily damaged due to long-term soil friction and wind and sand abrasion. Furthermore, the membrane is prone to expansion and contraction due to soil moisture changes, as well as settlement and slippage. It cannot maintain the set angle and reflector structure for long periods, resulting in frequent deviations in the reflection angle and complete loss of directional reflection effect. Consequently, it cannot stably reflect all sunlight onto the photovoltaic panel. This ultimately leads to low reflective power generation efficiency, poor stability, and short lifespan, rendering it impractical and uneconomical, and failing to achieve the design goal of enhancing photovoltaic reflective efficiency.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows.

[0017] Firstly, it significantly increases power generation: Vacuum reflectors can directionally reflect sunlight onto the light-receiving surface of photovoltaic panels, thereby increasing light intensity and power generation. Tests show that it can increase power generation by more than 80%.

[0018] Secondly, it utilizes locally sourced materials and has extremely low costs: only vacuum bags and on-site sand are needed; a vacuum is created to form the reflector bracket, eliminating the costs of steel, concrete foundation materials, and the extensive transportation and installation of the reflector bracket. Compared to the "T-type reflector cost" of 0.60 yuan / W described in the background art, the vacuum reflector block in this invention, which replaces the existing reflector bracket and reflector, is only 11% of the "T-type reflector cost," making the reflector cost extremely low.

[0019] The reflective layer is the core enhancement component of this invention. For example, 12-micron-level mirror-reflective aluminum foil, which can be used for reflection, can be purchased on a large scale at a cost as low as 0.35 yuan / m², making it extremely low-cost. It possesses high reflectivity, is lightweight, and easy to install, making it a key material for achieving reflective enhancement. However, the core bottleneck of current reflective technology is not the reflective layer itself, but the cost of fixing and stabilizing it against typhoons: traditional stabilization solutions rely on steel, concrete foundations, or heavy anchoring structures to construct the reflector brackets, with construction and material costs exceeding 25 yuan / m², more than seventy times the material cost of the reflective layer (0.35 yuan / m²). The reflective layer, as a core functional component, has extremely low cost, while the reflector bracket, as an auxiliary support, has extremely high cost; this inverted value-cost relationship completely violates the normal value logic of "expensive main components and inexpensive auxiliary components," and contradicts normal engineering and market value logic. This is the reason why the overall economic efficiency of reflective enhancement solutions is poor, making large-scale promotion difficult.

[0020] For example, ordinary cement bricks, the cheapest among various waterproof, sun-proof, and durable building materials, are made by pressing cement, sand, gravel, fly ash, and other materials without firing, with an average market price of about 30 yuan / m². Adding the aforementioned stabilization cost of 25 yuan / m² and the cost of aluminum foil reflective material of 0.35 yuan / m², the total cost is at least 55.35 yuan / m². However, the vacuum reflective block constructed by this invention, using vacuum soil blocks with mirror-reflective aluminum foil, costs only 5 yuan / m², a difference of more than ten times in overall cost. Therefore, this invention, using vacuum soil blocks as the supporting and stabilizing structure for the reflective layer, fundamentally solves the problem of extremely high stabilization costs.

[0021] The vacuum soil pier, replacing the existing reflector bracket, uses on-site sand as raw material and is solidified under vacuum negative pressure. Its dense, stable structure can reliably support the reflective layer and withstand typhoon damage, minimizing maintenance costs. This structure eliminates the need for expensive materials such as steel and cement, and avoids complex construction procedures. It utilizes locally sourced materials and is formed in one step, achieving fixation, wind resistance, and stable support for the reflective layer at extremely low cost. Compared to existing technologies, this invention significantly reduces maintenance expenses, making low-cost reflective enhancement technology valuable for large-scale application, balancing high-efficiency reflective power generation with extreme economic efficiency.

[0022] Thirdly, the structure is stable and resistant to wind and slippage: the vacuum reflector formed by vacuum consolidation is reliable in its own weight, does not soften or collapse, and can maintain the best reflection angle of the reflector for a long time.

[0023] Fourth, it is an agricultural-solar complementary and eco-friendly system: the vacuum reflective piers only occupy part of the ground, and the open space in the middle can be used to plant crops or cultivate grass, without damaging the topsoil or affecting agricultural production.

[0024] Fifth, construction is quick and maintenance is simple: the preparation can be completed on site by shaping the template, filling and vibrating, and vacuum sealing. The vacuum strength can be restored by exhaust valve later. Water spraying will not cause wrinkles, water accumulation or bulging.

[0025] Sixth, it is suitable for a wide range of scenarios: it can be used in farmland, orchards, deserts, Gobi, abandoned land, etc., and has the functions of power generation, windbreak and sand fixation, and ecological restoration. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the structure of the vacuum soil pier described in this invention.

[0027] Figure 2 This is a schematic diagram of the structure of a vacuum reflector.

[0028] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure at position AB.

[0029] Figure 4 This is a schematic diagram of the structure when the vacuum bag is filled with air.

[0030] Figure 5 A schematic diagram of the structure of a vacuum mound formed when a transparent rectangular vacuum bag is filled with sand.

[0031] Figure 6 A partial structural diagram of a vacuum reflector installed on both sides of a vertically installed double-sided photovoltaic panel (for direct sunlight and reflected light power generation during the afternoon).

[0032] Figure 7 A schematic diagram of the structure for setting up a vacuum reflector on the south side of the photovoltaic panel.

[0033] Figure 8 This is a schematic diagram showing the layout of two adjacent vacuum reflective blocks and their double-sided photovoltaic panels.

[0034] Figure 9 This is a schematic diagram of the template structure.

[0035] Figure 10 A schematic diagram of a vacuum reflector wall installed on the north side of a double-sided photovoltaic panel.

[0036] Figure 11 A schematic diagram of a vacuum reflector (curved wall) installed on the north side of a double-sided photovoltaic panel.

[0037] Figure 12 A partial schematic diagram of a ground brick-type vacuum reflective pier laid on the ground near a photovoltaic panel.

[0038] The following are the symbols and their meanings: 1-Photovoltaic panel, 1a-Double-sided photovoltaic panel, 2-Vacuum reflective block, 2a-Vacuum soil block, 2b-Smooth surface, 2c-Reflective layer, 2d-Diffuse surface, 2e-Reflective curved surface, 2f-Mirror surface, 3-Vacuum bag, 4-Exhaust port, 5-Support, 6-Sand, 7-Air valve, 8-Light rays, 9-Bag opening, 10-Sun, 11-Template, 12-Crop. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1.

[0041] This embodiment prepares a vacuum reflector 2.

[0042] like Figure 2 , Figure 3 As shown, the vacuum reflective pier 2 includes a vacuum soil pier 2a and a reflective layer 2c. The vacuum soil pier 2a further includes an airtight layer such as... Figure 4 The vacuum bag 3 shown is filled with sand 6, which is simultaneously vibrated to compact the sand 6, and then sealed after being vacuumed, maintaining its negative pressure within the range of -0.10MPa to -0.06MPa; under the action of vacuum negative pressure, the vacuum bag 3 and the sand 6 pass through the template 11 (see Figure 9 Shaping and vacuum consolidation form such as Figure 1 The vacuum soil mound 2a shown here has a smooth surface 2b. The reason for emphasizing the need for the template 11 to shape the surface 2b is that a sandbag filled with sand at normal pressure without vacuuming, whose surface is not shaped by the template 11, will inevitably have curvature, be uneven, and be soft and easily deformable. After the reflective layer 2c is pasted on it, the reflective layer 2c will also inevitably have curvature, making it difficult to achieve the desired effect. Figure 8 As shown, all the light 8 incident on it is directionally reflected onto the double-sided photovoltaic panel 1a. Conversely, after the vacuum bag 3 of this invention is filled with sand 6 and shaped by the template 11, it will necessarily have the following characteristics: Figure 1 The smooth surface 2b shown must be rigid, and the following can be attached to it: Figure 2 After the reflective layer 2c shown, the reflective layer 2c must also be smooth, and it must be able to achieve the same effect as shown. Figure 8 As shown, all the light rays 8 that are incident on the reflective layer 2c are directionally reflected onto the double-sided photovoltaic panel 1a.

[0043] like Figure 9As shown, template 11 is a long groove-shaped structure with closed ends and an open top, including two parallel side templates and two end templates; the side templates are long strip-shaped plates with multiple vertically arranged stiffening support blocks evenly arranged along the length direction on the outer side; the end templates are short plates, vertically fixed to both ends of the side templates, forming a through long strip-shaped cavity with the side templates; the template as a whole has no bottom surface, and is used to shape the vacuum bag 3 and its inner sand 6 into a preset shape on the foundation.

[0044] A reflective layer 2c is applied to the smooth surface 2b of the vacuum mound 2a. Thin mirror-like reflective materials such as aluminum foil or aluminized film can be used to form a vacuum reflective mound 2 with the reflective layer 2c. The reflective layer 2c is preferably a mirror 2f, but can also be a diffuse surface 2d. The mirror 2f is configured as a reflector structure that directs the sunlight 8 from the sun 10 to the light-receiving surface of the photovoltaic panel 1, thereby increasing the amount of light received and the power generation of the photovoltaic panel 1.

[0045] The ground area between the photovoltaic panel 1 and the photovoltaic array formed by them and the vacuum reflector 2, or between two adjacent vacuum reflectors 2, is set as a crop planting area or grass cultivation area.

[0046] The vacuum bag 3 is preferably made of an airtight composite material with a built-in reflective layer 2c (such as a PE+Al+woven fabric+PET composite structure), and has puncture resistance, water resistance, weather resistance, and anti-aging properties, with a service life of ≥25 years, suitable for high and low temperature environments in desert areas. The shape and size of the vacuum bag 3 are set according to the specifications of the photovoltaic panel 1. For example, it can be designed as a trapezoidal body with a sloping top, 12m long, 3m wide, and 0.3m~0.5m high. The vacuum bag 3 is equipped with an exhaust port 4, and the exhaust port 4 is preferably equipped with an air valve 7 (such as an air valve) for connecting to vacuum equipment. It should be noted that if an airtight composite material with a built-in reflective layer 2c is used to make the vacuum bag 3, there is no need to add an additional reflective layer 2c.

[0047] When making the vacuum soil mound 2a, first place the vacuum bag 3 inside the template 11 of the pre-set shape at the construction site; then take sand on site as the filling material for the sand 6, and fill it into the vacuum bag 3 through the bag opening 9. It can be filled manually or by using a conveying equipment; during the filling process, open the exhaust port 4 to release air, and compact the sand 6 by vibration; after filling, heat seal the bag opening 9; before heat sealing the bag opening, a protective film can be set on the inside of the bag opening in advance. After filling, remove the protective film to ensure that the inside of the bag opening is clean before heat sealing.

[0048] After the bag opening is sealed, a vacuum device is connected through the exhaust port 4 to evacuate the bag to a gauge pressure of -0.10MPa to -0.06MPa. After evacuation, the air valve 7 is closed, and the vacuum bag 3 adheres tightly to the sand 6 under negative pressure, thereby forming a stable vacuum mound 2a with a smooth surface 2b.

[0049] The physical properties of the vacuum soil mound 2a are as follows: relative density ≥90%, dry density ≥1.85g / cm³, and unconfined compressive strength ≥250kPa; after removing the template 11, a high-gloss reflective layer 2c is applied to the smooth surface 2b to form a mirror surface 2f; the vacuum soil mound 2a is a rigid structure with a relative density ≥70%, dry density ≥1.61g / cm³, and unconfined compressive strength ≥200kPa.

[0050] During the later maintenance of the vacuum reflector 2, the vacuum level should be checked regularly. If the vacuum level is lower than 0.06MPa, the vacuum equipment can be connected through the air valve 7 of the exhaust port 4 to replenish the vacuum and maintain the vacuum level, so as to ensure the structural strength of the vacuum reflector 2 and the smoothness of the mirror surface 2f.

[0051] In this embodiment, vacuum bags 3 are prepared using PE+Al+woven fabric+PET composite materials with a width of 2.6m and a length of 200m, with a material cost of approximately 2.4 yuan / m². Vacuum bags 3 with dimensions of 2m×1m×0.5m are prepared, with a material consumption of approximately 7m² per bag and a material cost of approximately 16.8 yuan. The cost of the finished vacuum reflector 2 (including processing fees) is approximately 25 yuan, and the corresponding cost of the reflective layer 2c is approximately 12.5 yuan / m².

[0052] The area required for a single 730W photovoltaic panel 1 with a mirror 2f reflective layer 2c is approximately 3.1 m², and the investment cost of the vacuum reflector 2 is approximately 38.75 yuan. Actual measurements show that the mirror 2f reflective layer 2c can increase the power generation gain of a single 730W photovoltaic panel 1 by over 80%, equivalent to an additional 584W of power generation. Based on the investment cost and the equivalent additional power, the reflective cost is approximately 0.066 yuan / W. Compared to the 0.60 yuan / W "T-type reflective cost" described in the background art, the reflective cost of this invention is 11% of the "T-type reflective cost" described in the background art (0.066 yuan / W ÷ 0.60 yuan / W). It is precisely because the reflective cost is so extremely low that this invention possesses unexpected beneficial technical effects and economic value.

[0053] To understand this invention from another perspective: the average purchase price of the above-mentioned 730W photovoltaic panel 1 is 555 yuan, and the average price per watt is 0.76 yuan / W. After using the vacuum reflector 2 in this invention, its power increases to 730W + 584W = 1314 W / panel, which is equivalent to a decrease in the price per watt to 555 yuan / 1314 W = 0.422 yuan / W, which is equivalent to a decrease in the price per watt of 44.5%.

[0054] The photovoltaic industry is currently experiencing fierce competition, reaching its limit. The average price of photovoltaic panels has dropped to 0.76 yuan / W, leaving manufacturers with a profit of only 0.05 yuan per watt. This meager profit margin means that conventional cost-reduction and efficiency-enhancing methods are no longer sufficient to achieve significant cost reductions, and the industry is facing a bottleneck in cost reduction. Against this backdrop, this invention takes a different approach, abandoning the traditional reflector bracket and using a vacuum soil mound 2a to replace it. This achieves a significant cost reduction breakthrough that is difficult for module manufacturers in the industry to match, reducing costs by 0.338 yuan per watt. This breaks the existing cost-reduction dilemma in the photovoltaic industry and provides a new low-cost solution for photovoltaic project construction.

[0055] Example 2.

[0056] like Figure 6 As shown, a vacuum soil mound 2a is prepared according to Example 1. The surface of the vacuum soil mound 2a is provided with a planar mirror 2f (i.e., a reflective plane) and a reflective layer 2c, thereby creating a vacuum reflective mound 2 with a planar reflective layer 2c (i.e., a reflective plane). The vacuum reflective mound 2 is placed on the east and west sides of the double-sided photovoltaic panel 1a and the photovoltaic array formed by the combination of the panels.

[0057] The bifacial photovoltaic panel 1a adopts heterojunction cell technology with a bifaciality of 70% to 100%. It is installed vertically with the panel extending along the north-south direction, and the front and back sides facing east and west respectively to receive sunlight.

[0058] The angle ∠β between the planar mirror 2f of the vacuum reflector 2 and the surface of the double-sided photovoltaic panel 1a is ≤90°, preferably 90°. In this way, the planar mirror 2f and the double-sided photovoltaic panel 1a have a reflector structure, and most of the sunlight 10 rays 8 that shine on the planar mirror 2f will be directionally reflected onto the double-sided photovoltaic panel 1a, thereby significantly increasing the amount of light received and the amount of power generated by the double-sided photovoltaic panel 1a.

[0059] Optionally, such as Figure 8 As shown, the ground area between two adjacent vacuum reflective blocks 2 is set as a planting area for crops 12 or a grass cultivation area.

[0060] Example 3.

[0061] like Figure 7 As shown, a vacuum reflector 2 is prepared according to Example 2. The surface of the vacuum reflector 2 is provided with a planar mirror 2f. The vacuum reflector 2 is placed on the south side of the photovoltaic panel 1.

[0062] The photovoltaic panel 1 is a single-sided (photovoltaic) panel, or a double-sided photovoltaic panel 1a with a double-sided ratio of 70% to 100%; the angle ∠α between the planar mirror 2f on the vacuum reflector 2 and the extension line of the photovoltaic panel 1 is ≥90°. In this way, some of the sunlight 10 rays 8 that shine on the planar mirror 2f will be directionally reflected onto the photovoltaic panel 1, thereby appropriately increasing the amount of light received and the amount of power generated by the photovoltaic panel 1.

[0063] Example 4.

[0064] like Figure 10 As shown, a vertical vacuum reflector 2, also known as a vacuum reflector wall, is prepared according to Example 2. The surface of the vacuum reflector 2 is provided with a diffuse surface 2d. The vacuum reflector 2 is placed on the north side of the double-sided photovoltaic panel 1a.

[0065] The bifacial photovoltaic panel 1a has a bifaciality of 70% to 100% and is installed at a south-facing tilt angle. In this way, the diffuser surface 2d can diffuse the light 8 that shines on it to the back of the bifacial photovoltaic panel 1a, thereby appropriately increasing the amount of light received and the amount of power generated by the bifacial photovoltaic panel 1a.

[0066] like Figure 11 As shown, the aforementioned vacuum reflector wall can also be configured as a curved reflector wall, the surface of which is a reflective curved surface 2e. In this way, the reflective curved surface 2e can better reflect the light 8 shining on it to the back of the bifacial photovoltaic panel 1a, thereby appropriately increasing the amount of light received and the amount of power generated by the bifacial photovoltaic panel 1a.

[0067] like Figure 12 As shown, vacuum reflective blocks 2, which are 10mm to 30mm thick and resemble mirror tiles, can also be made and laid on the ground on both sides of the photovoltaic panel 1. In this way, the light 8 shining on them can be reflected back onto the photovoltaic panel 1, thereby appropriately increasing the amount of light received and the amount of power generated by the photovoltaic panel 1.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vacuum reflective pier ecological photovoltaic system, comprising photovoltaic panels and a photovoltaic array composed of them, characterized in that: Vacuum soil blocks are provided on one or both sides of the photovoltaic panel; The vacuum soil mound includes an airtight vacuum bag and sand filling material inside the vacuum bag; The vacuum bag and the sand inside it are shaped by a template, vacuumed, and sealed, with the negative pressure inside the bag maintained at -0.10MPa to -0.006MPa; The vacuum bag and the sand inside it are vacuum-consolidated to form a rigid vacuum mound with a smooth surface. The smooth surface of the vacuum soil mound is provided with a reflective layer to form a vacuum reflective mound; The reflective layer is a mirror, a diffuse surface, or a reflective curved surface, used to reflect sunlight to the light-receiving surface of the photovoltaic panel; The ground area between the photovoltaic array and the vacuum reflector, or between adjacent vacuum reflectors, shall be designated as a crop planting area or a grass cultivation area.

2. The vacuum reflective pier ecological photovoltaic system according to claim 1, characterized in that: The vacuum bag is equipped with an exhaust port for venting air and replenishing vacuum during filling to maintain negative pressure; the sand is one or more of sand, gravel, and soil, and is compacted by vibration after filling.

3. The vacuum reflective pier ecological photovoltaic system according to claim 1, characterized in that: The vacuum bag contains a desiccant and / or an insect repellent.

4. The vacuum reflective pier ecological photovoltaic system according to claim 1, characterized in that: The photovoltaic panel is a double-sided photovoltaic panel with a double-sided ratio of 70% to 100%. The double-sided photovoltaic panel is vertically arranged and extends along the north-south direction, with the front and back facing east and west respectively. The vacuum reflector is set on the east and west sides of the double-sided photovoltaic panel, and the reflective layer is a reflective plane. The angle ∠β between the reflective plane and the photovoltaic panel surface is ≤90°, preferably 90°.

5. The vacuum reflective pier ecological photovoltaic system according to claim 1, characterized in that: The photovoltaic panel is tilted to the south; the vacuum reflector is located on the south side of the photovoltaic panel; the reflective layer is a reflective plane, and the angle ∠α between the reflective plane and the extension line of the photovoltaic panel is ≥90°.

6. The system according to claim 1, characterized in that: The physical properties of the vacuum soil mound are: relative density ≥70%, dry density ≥1.61g / cm³, and unconfined compressive strength ≥200kPa.

7. The vacuum reflective pier ecological photovoltaic system according to claim 1, characterized in that: The vacuum soil mound is a vacuum soil slab or a vacuum soil brick.

Images