Wind shield for photovoltaic power plant

Abstract

The utility model relates to a windproof cover for a photovoltaic power plant, which is characterized in that a head windproof cover covers the head of an array, and a tail windproof cover covers the tail of the array. In the head windproof cover, a front windproof net is arranged on the head of an array, a first top windproof net covers the upper portion of the head of the array, the first top windproof net sequentially comprises an arch-shaped section, a head inclined section and a head parallel section from the head of the array, the three sections are smoothly connected, and the arch-shaped section is tightly connected with the front windproof net. One side of the first side wing windproof net is connected with the front windproof net, and the adjacent side is connected with the first top windproof net; in the tail windproof cover, a second top windproof net covers the upper portion of the tail of the array and sequentially comprises a tail inclined section and a tail parallel section from the tail direction of the array to the head direction of the array, the two sections are smoothly connected, and a second side wing windproof net is tightly connected with the side edge of the second top windproof net. According to the utility model, the material consumption of the windshield can be reduced, the cost is saved, vortexes in a wind field can be eliminated, and the photovoltaic module can be better protected.

Description

Technical Field

[0001] This utility model relates to a windproof cover for photovoltaic power plants, belonging to the field of photovoltaic power generation. Background Technology

[0002] Against the backdrop of the current accelerated transformation of the energy structure, the construction scale and number of photovoltaic power plants are showing a rapid growth trend. With the increasing number of photovoltaic power plants being put into operation, the impact of strong winds on photovoltaic arrays has gradually become a key issue of concern within the industry. This is especially true in the vast open areas of western my country, where centralized photovoltaic power plants are scattered throughout. The unique geographical environment and climate conditions of the west result in frequent strong winds, leading to numerous instances of damage to photovoltaic modules, posing a severe challenge to the stable operation and economic benefits of photovoltaic power plants.

[0003] Currently, the industry mainly adopts two mainstream solutions to resist the impact of strong winds on photovoltaic power plants. One is to use photovoltaic windproof supports. These supports, with their structural design and mechanical properties, can provide relatively reliable support and protection for photovoltaic modules when dealing with low to medium intensity winds, effectively reducing the risk of damage. However, when facing high intensity winds, the protective capabilities of photovoltaic windproof supports become insufficient. At this point, the second solution, deploying windproof netting across the entire photovoltaic field, becomes an important means of ensuring the safety of the photovoltaic power plant. However, centralized photovoltaic power plants in western China are extremely large in scale. Enclosing the entire photovoltaic field with windproof netting would result in staggering material costs, installation costs, and subsequent maintenance costs, undoubtedly placing a heavy economic burden on the construction and operation of the power plant.

[0004] In addition, strong winds flowing past photovoltaic arrays can create vortex phenomena due to the obstruction and interference of the photovoltaic modules. Related research and real-world examples show that the localized unstable airflow formed by these vortices exerts additional, irregular forces on the photovoltaic modules, which is one of the main causes of damage to these modules. For instance, scholar Zhang Weida, in his "Research on Wind Load and Wind-Induced Response of Single-Axis Photovoltaic Arrays," conducted an in-depth analysis of this phenomenon, revealing the intrinsic mechanism by which vortices damage photovoltaic modules.

[0005] To address the vortex problem, the industry is constantly exploring effective solutions. For example, patent CN101487358B proposes an innovative solution of adding a top-mounted rectification grille to the windproof area. By rationally designing the shape, size, and installation angle of the rectification grille, strong wind airflow can be effectively guided and rectified, thereby largely eliminating the generation of vortices and reducing their threat to photovoltaic modules. However, achieving effective guidance and rectification of strong wind airflow requires precise design of the shape, size, and installation angle of the rectification grille. Different photovoltaic power station environments and strong wind conditions vary, making it difficult to find suitable design parameters; the design process may require extensive simulations and experiments. Furthermore, high precision is required during installation, increasing construction difficulty and cost. Patent CN106760931 takes a different approach, using an inverted concave mesh to enhance windproofing. This unique mesh structure not only enhances the ability to block strong winds and improves windproofing, but also reduces the consumption of windproofing materials to some extent, lowering costs. However, although the inverted concave mesh can enhance wind resistance to some extent, it may not be able to completely block or effectively guide airflow in some extreme strong winds or winds with special directions, and air leakage still exists. It is difficult to completely avoid the generation of vortices, and there are certain limitations in the protection of photovoltaic modules.

[0006] Therefore, it is still necessary to propose a new wind shield for photovoltaic power plants that can both save costs and eliminate vortices in the wind field to protect photovoltaic modules. Utility Model Content

[0007] This invention provides a windproof cover for photovoltaic power plants, which can not only reduce the material consumption of the windproof cover and save costs, but also eliminate vortices in the wind field and better protect the photovoltaic modules.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A windproof cover for a photovoltaic power plant, wherein several photovoltaic modules form a photovoltaic array, and the windward end of the photovoltaic array is defined as the array head and the leeward end as the array tail.

[0010] A head wind shield is installed at the head of the array, and a tail wind shield is installed at the tail of the array. The coverage area of ​​the head wind shield is 2.5-4 times that of the tail wind shield.

[0011] The head windproof cover includes a front windproof net, a first top windproof net, and two first side windproof nets. The front windproof net is laid on the head of the array, and the first top windproof net covers the top of the array head. Starting from the head of the array, it includes an arched section, a head inclined section, and a head parallel section in sequence. The three sections are smoothly connected, and the arched section is tightly connected to the front windproof net.

[0012] One side of the first wing windproof net is connected to the front windproof net, and its adjacent side is connected to the first top windproof net;

[0013] The tail wind shield includes a second top wind shield and two second side wind shields. The second top wind shield is covered above the tail of the array and includes a tail inclined section and a tail parallel section in sequence from the tail of the array to the head of the array. The two sections are smoothly connected. The second side wind shield is tightly connected to the side of the second top wind shield.

[0014] Furthermore, the front windproof net is arranged perpendicular to the wind direction at the head of the array;

[0015] Furthermore, the first side wing windproof net includes a smoothly connected arc-shaped segment and a vertical segment from the head direction of the array to the tail direction of the array. The arc-shaped segment expands outward towards the photovoltaic array, and the vertical segment is set perpendicular to the ground.

[0016] Furthermore, the second side wing windproof net includes two planes that are perpendicular to the ground and smoothly connected. The connection between the two planes matches the connection between the tail inclined section and the tail parallel section, forming a bend.

[0017] Furthermore, the plane matching the tail tilt section is tilted towards the photovoltaic array, and its angle with the wind direction is 5°-45°.

[0018] Furthermore, the angle between the inclined section at the tail of the second top windbreak net and the ground is 2°-30°.

[0019] Furthermore, the height of the front windproof netting deployed at the head of the array is 1-2.5 times the height of the photovoltaic module; the height of the head parallel section of the first top windproof netting and the tail parallel section of the second top windproof netting are both 2-5 times the height of the photovoltaic module.

[0020] Furthermore, the porosity of the windproof mesh in the head and tail windproof shields is 35%-60%.

[0021] Furthermore, both the head and tail wind shields are made of galvanized perforated plate or polyethylene.

[0022] Furthermore, the head shield covering the array head and the tail shield covering the array tail can be used simultaneously or separately.

[0023] By using the above technical solutions, compared with the prior art, this utility model has the following beneficial effects:

[0024] 1. The wind shield for photovoltaic power plants provided by this utility model, combined with the characteristic that photovoltaic arrays are mostly rectangular, can significantly reduce the material consumption of the wind shield itself through ingenious structural design and material selection, and effectively save construction costs.

[0025] 2. The windproof cover for photovoltaic power plants provided by this utility model has a front windproof net at the head of the windproof cover that serves as a vertical windproof wall. The first top windproof net adopts an arch shape combined with a horizontal section, and the first side windproof net adopts an arc shape combined with a parallel section. The second top windproof net of the tail windproof cover adopts a horizontal section combined with an inclined section, and the second side windproof net has two vertical planes. The above-mentioned unique shape and layout can scientifically and rationally guide strong wind airflow, eliminate vortices in the wind field from the root, provide more comprehensive and efficient protection for photovoltaic modules, and effectively ensure the stable and reliable operation of photovoltaic power plants in strong wind environments. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a side view of a preferred embodiment provided by this utility model;

[0028] Figure 2 This is a top view of a preferred embodiment provided by this utility model.

[0029] In the diagram: 1 is the head windproof cover, 2 is the tail windproof cover, 3 is the front windproof net, 4 is the first top windproof net, 5 is the first side windproof net, 6 is the second top windproof net, 7 is the second side windproof net, and 8 is the photovoltaic array. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, are only for the convenience of describing the present invention 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. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

[0031] To address the problems in the background technology, based on in-depth research and analysis of the actual operation of photovoltaic power plants, and taking into full account the significant characteristic that photovoltaic arrays are mostly rectangular, this application provides a windproof cover for photovoltaic power plants. For example... Figures 1-2As shown, the windward end of the photovoltaic array is defined as the array head, and the leeward end as the array tail. A head windproof cover 1 is installed at the array head, and a tail windproof cover 2 is installed at the array tail. The head and tail windproof covers do not cover the entire photovoltaic array 8. This is because the design reduces the vortices generated when strong winds pass through the photovoltaic array, while also taking into account design costs, focusing on protecting the vulnerable parts of the photovoltaic array to maximize its protection.

[0032] Vortexes are rotational motions of air generated during flow due to velocity gradients, pressure gradients, or interference from obstacles. In photovoltaic power plants, when wind flows over photovoltaic modules, it creates a low-pressure area on the back of the modules, causing airflow separation and generating vortices. Unevenness in the wind field (such as sudden changes in wind speed or direction) can also induce vortices. Therefore, to reduce or eliminate vortices, the wind shield design provided in this application achieves this purpose by altering the flow characteristics of the wind field.

[0033] For the head wind shield, preferably, it includes a front wind shield net 3, a first top wind shield net 4, and two first side wind shield nets 5. The front wind shield net is deployed at the head of the array, perpendicular to the wind direction. As a vertical windbreak wall, the front wind shield net effectively reduces wind speed, making the wind field more uniform before entering the photovoltaic area. The first top wind shield net covers the top of the array head and, starting from the array head, sequentially includes an arched section, a head-sloping section, and a head-parallel section, all three smoothly connected. The arched section is tightly connected to the front wind shield net. The arched section gradually rises, guiding the wind upwards and preventing direct impact on the photovoltaic modules. The head-parallel section stabilizes the wind field, reducing sudden changes in wind speed. The head-sloping section acts as a bridge connecting the arched section and the head-parallel section, guiding the wind direction smoothly towards the head-parallel section, further reducing sudden changes in wind speed.

[0034] In addition to the top wind protection structure, it is also necessary to reduce lateral wind interference. Therefore, a first side-wing windproof net was designed, with one side connected to the front windproof net and the adjacent side connected to the first top windproof net. The first side-wing windproof net, from the head to the tail of the array, includes sequentially and smoothly connected arc-shaped and vertical sections. The arc-shaped sections expand outwards from the photovoltaic array, while the vertical sections are perpendicular to the ground. The arc-shaped sections guide wind to bypass the photovoltaic area from both sides, reducing lateral wind interference, while the vertical sections stabilize the wind field on the sides, preventing the formation of lateral vortices.

[0035] Next, regarding the tail wind shield, it is installed on the leeward side of the photovoltaic array to prevent tail vortices from damaging the photovoltaic modules. Preferably, it includes a second top wind shield 6 and two second side wind shields 7. The second top wind shield covers the tail of the array and includes a tail-sloping section and a tail-parallel section sequentially from the tail to the head of the array, with the two sections smoothly connected. The tail-parallel section covers the end of the windproof area, allowing for a smooth transition of the wind field. The tail-sloping section guides the wind downwards, preventing the formation of a low-pressure area on the back of the photovoltaic modules, thereby reducing the generation of back vortices. Regarding the tilt angle of the tail-sloping section, after actual testing, the angle between the tail-sloping section surface and the ground is designed to be 2°-30°.

[0036] At the leeward end of the photovoltaic array, the interference from side winds also needs to be considered. Therefore, the tail wind shield also includes a second side wing windproof net, which is tightly connected to the side of the second top windproof net. The second side wing windproof net includes two planes perpendicular to the ground and smoothly connected. The connection point of the two planes matches the connection point of the tail inclined section and the tail parallel section, forming a bend. The bend is formed to fit and match the structural design of the second top windproof net. At the same time, the plane on the left is parallel to the wind direction, reducing the wind splitting on the side, while the plane on the right guides the wind to flow inward, avoiding the formation of vortices on the side. Through actual testing, the plane matching the tail inclined section is inclined towards the photovoltaic array, and its angle with the wind direction is 5°-45° for optimal performance.

[0037] Clearly, the aforementioned wind shields for photovoltaic power plants, through their arched, inclined, and parallel structures, guide the wind flow along a predetermined path, preventing direct wind impact on the photovoltaic modules or the formation of separation zones on their backs. The design of the inclined sections (such as the tail inclined section of the second top wind shield and the right side plane of the second side wing wind shield) can guide the wind downwards or inwards, reducing wind separation and vortex formation. To ensure the structure's service life, both the head and tail wind shields are made of galvanized perforated steel or polyethylene.

[0038] This application features an innovative design for eliminating vortices. The height of the front windproof netting at the array head is designed to be 1-2.5 times the height of the photovoltaic modules. The height of the parallel section at the head of the first top windproof netting and the parallel section at the tail of the second top windproof netting are both designed to be 2-5 times the height of the photovoltaic modules. The coverage area of ​​the head windproof cover is 2.5-4 times that of the tail windproof cover. Typically, the head windproof cover covers 5-30 rows of photovoltaic modules, and the tail windproof cover covers 2-8 rows, enabling the wind field to be evenly distributed throughout the photovoltaic area, avoiding vortices caused by excessively high or low local wind speeds. The porosity of the windproof netting in both the head and tail windproof covers is 35%-60%. This porous structure effectively reduces wind speed, stabilizes the wind field, and minimizes vortices caused by sudden changes in wind speed.

[0039] It should be noted that the head shield covering the array head and the tail shield covering the array tail can be used simultaneously or separately.

[0040] In practical applications, the tail windproof cover is designed with a second top windproof net consisting of two connected planes. One plane is parallel to the ground and covers the end of the windproof area; the other plane slopes downwards and covers the back of the windproof area at a 10° angle to the ground. The second side windproof nets are arranged on both sides of the windproof area, each consisting of two connected planes. One plane is parallel to the wind direction and covers the end of the windproof area; the other plane slopes inwards and covers the back of the windproof area at a 15° angle to the photovoltaic array. Both the head and tail windproof covers are made of perforated galvanized steel sheets. The height of the front windproof net is approximately twice the height of the photovoltaic modules, and the height of the head windproof cover is approximately four times the height of the photovoltaic modules. The head windproof cover covers 12 rows of photovoltaic modules, and the tail windproof cover covers 2 rows of photovoltaic modules. The arc of the first side windproof net is consistent with the arc of the first top windproof net. The porosity of the windproof nets is 45%.

[0041] The head wind shield, tail wind shield, and photovoltaic array are integrated into a streamlined whole. This not only effectively suppresses vortex formation but also saves on windbreak nets. Since adopting this wind shield, no damage to the photovoltaic modules has occurred, and the wind resistance level has been improved from level 10 to level 11, demonstrating superior wind protection compared to traditional windbreak nets.

[0042] In summary, the wind shield for photovoltaic power plants provided in this application, from a fluid dynamics perspective, fully leverages the significant characteristic of photovoltaic arrays being predominantly rectangular. The meticulously designed wind shield alters the wind flow path, resulting in a more uniform pressure distribution, reducing the formation of localized low-pressure areas, effectively controlling the boundary layer of the wind field, and minimizing wind separation and vortex generation. The porous structure of the wind shield suppresses turbulence, making the wind field more stable. Ultimately, this not only protects photovoltaic modules from wind pressure damage but also improves the operational efficiency and stability of photovoltaic power plants.

[0043] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0044] The meaning of "and / or" as used in this application includes both situations where each exists alone or both exist simultaneously.

[0045] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0046] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A windproof cover for photovoltaic power plants, characterized in that: A number of photovoltaic modules form a photovoltaic array (8). The windward end of the photovoltaic array (8) is defined as the array head, and the leeward end is defined as the array tail. A head wind shield (1) is installed at the head of the array, and a tail wind shield (2) is installed at the tail of the array. The coverage area of ​​the head wind shield (1) is 2.5-4 times that of the tail wind shield (2). The head windproof cover (1) includes a front windproof net (3), a first top windproof net (4) and two first side windproof nets (5). The front windproof net (3) is laid on the head of the array, and the first top windproof net (4) is covered above the head of the array. Starting from the head of the array, it includes an arched section, a head inclined section and a head parallel section in sequence. The three sections are smoothly connected, and the arched section is tightly connected to the front windproof net (3). One side of the first wing windproof net (5) is connected to the front windproof net (3), and its adjacent side is connected to the first top windproof net (4); The tail wind shield (2) includes a second top wind shield (6) and two second side wind shields (7). The second top wind shield (6) covers the top of the array tail and includes a tail inclined section and a tail parallel section in sequence from the array tail direction to the array head direction. The two sections are smoothly connected. The second side wind shield (7) is tightly connected to the side of the second top wind shield (6).

2. The windproof cover for photovoltaic power plants according to claim 1, characterized in that: The front windproof net (3) is installed perpendicular to the wind direction at the head of the array.

3. The windproof cover for photovoltaic power plants according to claim 1, characterized in that: The first side wing windproof net (5) includes a smoothly connected arc segment and a vertical segment from the head direction of the array to the tail direction of the array. The arc segment expands outward towards the photovoltaic array (8), and the vertical segment is set vertically to the ground.

4. The windproof cover for photovoltaic power plants according to claim 1, characterized in that: The second side wing windproof net (7) includes two planes that are perpendicular to the ground and smoothly connected. The connection between the two planes matches the connection between the tail inclined section and the tail parallel section, forming a bend.

5. The windproof cover for photovoltaic power plants according to claim 4, characterized in that: The plane matching the tail tilt section is tilted towards the photovoltaic array (8), and its angle with the wind direction is 5°-45°.

6. The windproof cover for photovoltaic power plants according to claim 1, characterized in that: The tail section of the second top windproof net (6) has an angle of 2°-30° between its tail section surface and the ground.

7. The windproof cover for photovoltaic power plants according to claim 1, characterized in that: The height of the front windproof net (3) installed at the head of the array is 1-2.5 times the height of the photovoltaic module; the height of the head parallel section of the first top windproof net (4) and the tail parallel section of the second top windproof net (6) are 2-5 times the height of the photovoltaic module.

8. The windproof cover for photovoltaic power plants according to claim 1, characterized in that: The porosity of the windproof mesh of the head windproof cover (1) and the tail windproof cover (2) is 35%-60%.

9. The windproof cover for photovoltaic power plants according to claim 8, characterized in that: Both the head shield (1) and the tail shield (2) are made of galvanized perforated plate or polyethylene.

10. The windproof cover for photovoltaic power plants according to claim 1, characterized in that: The head shield (1) covering the array head and the tail shield (2) covering the array tail can be used simultaneously or separately.

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