Photovoltaic power generation device

Abstract

The invention discloses a photovoltaic power generation device, and relates to the field of photovoltaic technology, the photovoltaic power generation device comprises a photovoltaic module, a covering device, an installation part used for laying the photovoltaic module, and a supporting part used for supporting the installation part, the supporting part is arranged below the installation part, the covering device is arranged above the photovoltaic module, and the covering device is arranged above the photovoltaic module. Comprising a reel, a driving device used for driving the reel to rotate and a covering used for shielding a photovoltaic module, and the upper end of the covering is fixedly installed on the reel. According to the photovoltaic power generation device, the covering object can automatically cover the photovoltaic module through the covering device at night, and the situation that a glass panel of the photovoltaic module reflects a light source to interfere with direction discrimination of migrating birds at night is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a photovoltaic power generation device. Background Art

[0002] According to the International Energy Agency, the world's coal can only be used for 220 years, and the peak of oil production is in 2012, and it will be exhausted in 30-60 years. Solar radiation is expected to maintain a nearly constant radiation output for 10 billion years. It is predicted that solar energy will account for 20% of the entire energy structure in 2050, and this proportion will reach 70% by 2100. Obviously, the energy structure of mankind will undergo fundamental changes in this century, and solar energy will become the most important energy source. Photovoltaic power generation, as a green and renewable energy form, has been widely used in more and more fields, especially large-scale photovoltaic power stations built on the Gobi Desert, which play an important role in alleviating the pressure of electricity consumption. However, existing photovoltaic modules are generally laid directly on mounting brackets, and are exposed at night when the photovoltaic modules are not working. The glass panels of the photovoltaic modules will reflect light from other light sources at night, especially the photovoltaic modules of large photovoltaic power stations built in remote areas. The reflected light cannot be ignored, which will interfere with migratory birds that rely on moonlight and starlight to determine the direction, affect the migratory birds' judgment of the route, disrupt the biological clock, and affect night migration. In the long run, it will pose a threat to the diversity of biological species. Summary of the invention

[0003] The present invention aims to solve the above technical problems to a certain extent. To this end, the present invention proposes a photovoltaic power generation device, in which a covering device is added to the photovoltaic module, and the covering device can automatically cover the photovoltaic module at night to avoid the influence of light reflected by the glass panel of the photovoltaic module on migratory birds at night, making the photovoltaic power generation device more environmentally friendly. In addition, the covering photovoltaic module can also play a role in preventing scratches, wind, rain and moisture at night, which not only increases the service life of the photovoltaic module but also avoids the PID effect of the photovoltaic module to a certain extent, resulting in electrical performance degradation.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: a photovoltaic power generation device, comprising a photovoltaic component, a covering device, a mounting component for laying the photovoltaic component, and a supporting component for supporting the mounting component, wherein the supporting component is arranged below the mounting component, and the covering device is arranged above the photovoltaic component, comprising a reel, a driving device for driving the reel to rotate, and a covering for shielding the photovoltaic component, wherein the upper end of the covering is fixedly arranged on the reel.

[0005] Through the above technical solution, during the day, the photovoltaic module is exposed to the sun to generate photovoltaic power. When the night falls and the light is insufficient, the driving device drives the reel to rotate forward to unfold the cover and cover the entire upper surface of the photovoltaic module. The shielding of the cover protects the photovoltaic module body at night on the one hand, and avoids the reflection of light by the glass panel of the photovoltaic module on the other hand, especially the photovoltaic modules of super-large photovoltaic power stations in remote areas reflect moonlight and starlight at night to interfere with the direction judgment of migratory birds at night. After dawn, when the light intensity is sufficient, the driving device drives the reel to rotate in the opposite direction to retract the cover to the reel, exposing the photovoltaic module body.

[0006] Furthermore, the shielding device further comprises an outer cover shell, the driving device and the reel are arranged inside the outer cover shell, and the outer cover shell plays a role in supporting and protecting the driving device and the control unit.

[0007] Furthermore, the driving device includes a tubular motor and a control unit, and the control unit controls the tubular motor to rotate forward or reverse, thereby driving the reel to rotate, thereby realizing the lifting and lowering operation of the covering.

[0008] Furthermore, the two ends of the reel are rotatably connected to the tubular motor and the outer cover respectively, and the reel is detachably installed to facilitate installation and replacement. The covering has two states on the reel. In the first state, one end of the covering is fixedly connected to the reel, and the other end is unfolded to cover the photovoltaic module. In the second state, one end of the covering is fixedly connected to the reel, and the other end is wound on the reel.

[0009] Furthermore, a support rod is fixedly arranged at the lower end of the covering. On the one hand, the support rod can keep the covering flat in the unfolded state, and on the other hand, the weight of the support rod itself can stretch the covering to play a windproof role.

[0010] Furthermore, guide rails are fixedly installed on the left and right sides of the photovoltaic module, respectively. The two guide rails are arranged in parallel, and the two ends of the support rod can slide inside the guide rails. By setting the guide rails, on the one hand, the guidance and limit of the cover when it is raised and lowered can be achieved, and on the other hand, it can also play a moisture-proof role. At night, the air humidity is often high, and water vapor is easy to enter the edge of the photovoltaic module. After EVA is hydrolyzed, acetic acid will be generated. Acetic acid reacts with Na in the glass to generate a large amount of free-moving Na ions, which will react with the silver grid lines on the surface of the battery cell, thereby corroding the battery grid lines, resulting in an increase in series resistance, generating a PID effect, causing the performance of the photovoltaic module to decay, and resulting in a decrease in photoelectric conversion efficiency. The outer cover shell, guide rails and support rods form a semi-enclosed space between the cover and the module, avoiding the entry of moisture at night, and can avoid the generation of the PID effect to a certain extent.

[0011] Furthermore, the lower end of the guide rail is provided with a locking device matched with the end of the support rod. When the reel rotates to make the covering reach the lower end of the guide rail, the locking device fixes the support rod, thereby fixing the covering.

[0012] Furthermore, the photovoltaic power generation device is also provided with a photosensitive control switch, which controls the tubular motor to rotate forward or reverse through a control unit. When night falls and the light intensity is lower than a set threshold, the photosensitive control switch controls the tubular motor to rotate forward through the control unit, driving the reel to rotate and unfold the covering. When the light intensity during the day is higher than the set threshold, the photosensitive control switch controls the tubular motor to rotate reversely, driving the reel to rotate and retract the covering.

[0013] Furthermore, the photovoltaic power generation device can also be provided with a timer switch, and the control unit controls the tubular motor to rotate forward or reverse at a specified time. At sunset, the timer switch triggers the tubular battery to rotate forward, driving the reel to rotate and unfold the covering. At sunrise, the timer switch triggers the tubular battery to rotate reversely, driving the reel to rotate and retract the covering. Either the timer switch or the photosensitive control switch can be selected as a trigger device for triggering the driving device to work.

[0014] Furthermore, the covering is one of double-coated flame retardant materials, nano flame retardant materials, TPU, and PEVA materials. These materials have stable physical and chemical properties, are sun-proof, dust-proof, rain-proof, scratch-resistant, and flame-retardant, and have high elasticity, high strength, high toughness, and are resistant to chemical corrosion, wear, and oil.

[0015] Furthermore, the outer surface of the cover is made of black matte material, which can better reduce the reflection of light by the cover.

[0016] Furthermore, a scraper is provided on the outer cover shell, and the scraper can be made of any material such as silicone, rubber, hard plastic or a brush. The scraper contacts the upper surface of the cover and can clean the upper surface of the cover while the cover is being retracted or released.

[0017] The present invention discloses the following technical effects:

[0018] The present invention installs a covering device on the photovoltaic module through the above technical scheme. During the day, the photovoltaic module is exposed to the outside for photovoltaic power generation. When the night falls and the light is insufficient, the tubular motor drives the reel to rotate so that the covering is unfolded and covers the upper surface of the photovoltaic module. The shielding of the covering protects the photovoltaic module body at night on the one hand, and avoids the reflection of the light source by the glass panel of the photovoltaic module on the other hand, especially avoids the interference of the photovoltaic module of the ultra-large photovoltaic power station in remote areas reflecting the moonlight and starlight at night on the direction identification of migratory birds at night. After dawn, when the light is sufficient, the reel rotates to retract the covering onto the reel, exposing the photovoltaic module body for photovoltaic power generation. The present invention uses a photosensitive control switch to automatically drive the covering to cover the upper surface of the photovoltaic module according to the light intensity, or uses a timing switch to drive the covering device to work at a specified time, so as to realize unmanned management. The outer cover shell, guide rail and support rod of the present invention form a semi-enclosed space between the covering and the upper surface of the photovoltaic module when the covering is unfolded, which has the effect of anti-scratch, windproof, rainproof and moisture-proof for the photovoltaic module, which not only increases the service life of the photovoltaic module but also avoids the PID effect of the photovoltaic module to a certain extent, resulting in the performance decline of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a photovoltaic power generation device according to an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the covering device in an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a covering device in a first state according to an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of the covering device in the second state according to an embodiment of the present invention;

[0024] Among them, 1. Photovoltaic module; 2. Covering device; 3. Mounting component; 4. Support component; 201. Outer cover shell; 202. Guide rail; 203. Photosensitive control switch; 204. Reel; 205. Cover; 206. Support rod; 207. Tubular motor; 208. Control unit; 209. Scraper strip; 210. Locking device. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figures 1 to 4 As shown, the present invention provides a photovoltaic power generation device, including a photovoltaic module 1, a mounting component 3 and a supporting component 4, wherein the mounting component 3 is used to lay the photovoltaic module 1, and the mounting component 3 is fixedly installed on the supporting component 4 at an angle, and the elevation angle and orientation of the mounting component 3 are determined according to the position, so as to ensure that there is sufficient and good lighting conditions on the photovoltaic module 1. A covering device 2 is provided on the upper part of the photovoltaic module 1, and specifically, the covering device 2 includes an outer cover shell 201 fixedly installed on the upper part of the photovoltaic module 1, a control unit 208 and a tubular motor 207 are fixedly installed in the outer cover shell 201, and a reel 204 is also provided in the outer cover shell 201, and the two ends of the reel 204 are respectively connected to the inner side of the outer cover shell 201 and the tubular motor 207 for rotation, and a covering 205 is wound on the reel 204, and a support rod 206 is provided at the lower end of the covering 205. Guide rails 202 are fixedly installed on the left and right sides of the photovoltaic module 1, and the two guide rails 202 are arranged in parallel, and the ends of the support rod 206 can slide inside the guide rails 202. The lower end of the guide rail 202 is provided with a locking device 210 that matches the end of the support rod 206. A photosensitive control switch 203 is provided on the outer side of the outer shell 201. When the light intensity is lower than the set threshold at night, the photosensitive control switch 203 controls the tubular motor 207 to rotate forward through the control unit 208, driving the reel 204 to rotate and unfold the covering 205. When the two ends of the support rod 206 reach the end of the guide rail 202, the control unit 208 controls the locking device 210 to fix the support rod 206. When the light intensity reaches the threshold of the photosensitive control switch 203 in the morning, the photosensitive control switch 203 controls the tubular motor 207 to rotate in the opposite direction after the control unit 208 retracts the locking device 210, driving the reel 204 to rotate and retract the covering 205.

[0028] like Figure 3 As shown, the covering device 2 is in the first state, and the covering 205 is unfolded.

[0029] like Figure 4 As shown, the covering device 2 is in the second state, and the covering 205 is retracted.

[0030] In this embodiment, by setting the guide rail 202, on the one hand, the guidance and limitation of the cover 205 when it is raised and lowered can be achieved, and on the other hand, it can also play a moisture-proof role. At night, the air humidity is often high, and water vapor is easy to enter the edge of the photovoltaic module. After EVA is hydrolyzed, acetic acid will be generated. Acetic acid reacts with Na in the glass to generate a large number of freely mobile Na ions, which will react with the silver grid lines on the surface of the battery cell, thereby corroding the battery grid lines, resulting in an increase in series resistance, generating a PID effect and causing the performance of the component to decay. The outer cover shell 201, the guide rail 202 and the support rod 206 form a semi-enclosed space between the cover 205 and the photovoltaic module 1, thereby preventing the entry of moisture at night and avoiding the generation of the PID effect to a certain extent.

[0031] Further optimization scheme, the photosensitive control switch 203 can be replaced with a timer switch, and the control unit 208 controls the tubular motor 207 to rotate forward or reverse at a specified time. At sunset, the timer switch triggers the tubular motor 207 to rotate forward, driving the reel 204 to rotate and unfold the cover 205. When the two ends of the support rod 206 reach the end of the guide rail 202, the control unit 208 controls the locking device 210 to fix the support rod 206. At sunrise, the timer switch triggers the control unit 208 to retract the locking device 210, and controls the tubular motor 207 to rotate reversely, driving the reel 204 to rotate and retract the cover 205. The timer switch can be fixedly installed inside the outer cover 201, avoiding the problem of erroneous operation caused by dust on the photosensitive control switch 203 installed outside the outer cover 201.

[0032] To further optimize the scheme, in addition to setting the photosensitive control switch 203 as a sensor for detecting light intensity, other sensors such as temperature sensors, humidity sensors, etc. can also be set. The sensor is electrically connected to the control unit 208. The sensor can monitor rain and then determine that it is raining. In addition, the temperature sensor can assist the photosensitive control switch 203 to accurately determine whether it is cloudy or sunset, thereby avoiding misoperation. When the monitoring value of the above sensor is greater than the preset threshold, the monitoring value is the action signal. The control unit 208 controls the tubular motor to make a corresponding action. By setting the sensor, the monitoring of the action timing can be made more accurate and efficient.

[0033] According to a further optimization scheme, the covering 205 is one of double-coated flame retardant materials, nano flame retardant materials, TPU, and PEVA materials. Preferably, double-coated flame retardant materials are used. This material is sun-proof, dust-proof, rain-proof, scratch-resistant, and flame-retardant, and has high elasticity, high strength, and high toughness. It is resistant to chemical corrosion, wear, and oil, and is a more ideal component covering material.

[0034] According to a further optimization solution, the outer surface of the cover 205 is made of black matte material, which can better reduce the reflection of light by the cover 205.

[0035] A further optimization scheme is that a scraper 209 is provided on the outer cover shell 201. The scraper 209 can be made of one of silicone, rubber, hard plastic or a brush. The scraper 209 contacts the upper surface of the cover 205. When the cover 205 is retracted or released, the scraper 209 can clean the dust, bird droppings or water dropped on the cover 205.

[0036] It should be understood that in actual applications, the solar cells in the photovoltaic module 1 can be conventional polycrystalline silicon cells, monocrystalline silicon cells, or PERC cells, TOPCon cells, HJT cells, IBC cells, etc., and this embodiment does not make specific limitations.

[0037] It should also be understood that the crystalline silicon cell can also be replaced by amorphous silicon solar cells such as flexible copper indium gallium selenide solar cells (CIGS), flexible perovskite solar cells, and flexible dye-sensitive solar cells.

[0038] Compared with the prior art, the photovoltaic power generation device of the embodiment of the present invention at least discloses the following beneficial effects:

[0039] Protecting the ecosystem: By covering the photovoltaic modules at night, the glass panels of the modules are prevented from reflecting light sources, especially the modules of super-large photovoltaic power stations in remote areas are prevented from reflecting moonlight and starlight at night, which will interfere with the direction judgment of migratory birds at night.

[0040] Protect the outer surface of photovoltaic modules: By covering the photovoltaic modules, the friction of wind and sand on the photovoltaic module glass at night is avoided, which causes the glass's light transmittance to decrease, and the service life of the modules is extended.

[0041] Improve the electrical performance of the components: The outer cover, guide rails and support rods form a semi-enclosed space between the cover and the components, preventing the entry of moisture at night and avoiding the occurrence of PID effect to a certain extent.

[0042] The details not described in detail in the present invention are all conventional technical means well known to those skilled in the art.

[0043] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A photovoltaic power generation device, characterized in that: The invention comprises a photovoltaic assembly (1), a covering device (2), a mounting component (3) for laying the photovoltaic assembly (1), and a supporting component (4) for supporting the mounting component (3), wherein the supporting component (4) is arranged below the mounting component (3), and the covering device (2) is arranged above the photovoltaic assembly (1), and comprises a reel (204), a driving device for driving the reel (204) to rotate, and a covering (205) for shielding the photovoltaic assembly (1), wherein the upper end of the covering (205) is fixedly mounted on the reel (204).

2. The photovoltaic power generation device according to claim 1, characterized in that: The covering device (2) further comprises an outer cover shell (201).

3. The photovoltaic power generation device according to claim 2, characterized in that: The reel (204) is rotationally connected to the tubular motor (207) and the outer casing (201) respectively.

4. The photovoltaic power generation device according to claim 1, characterized in that: A support rod (206) is fixedly disposed at the lower end of the cover (205).

5. The photovoltaic power generation device according to claim 4, characterized in that: The photovoltaic assembly (1) is fixedly mounted with guide rails (202) on both sides, respectively. The two guide rails (202) are arranged in parallel, and the ends of the support rods (206) can slide inside the guide rails (202).

6. The photovoltaic power generation device according to claim 5, characterized in that: A locking device (210) is provided at the lower end of the guide rail (202) and matches the end of the support rod (206).

7. The photovoltaic power generation device according to claim 6, characterized in that: The covering device (2) also includes a photosensitive control switch (203).

8. The photovoltaic power generation device according to claim 6, characterized in that: The covering device (2) also includes a timing switch.

9. The photovoltaic power generation device according to any one of claims 1 to 8, characterized in that: The covering (205) is one of double-coated flame retardant materials, nano flame retardant materials, TPU, and PEVA materials.

10. The photovoltaic power generation device according to any one of claims 1 to 8, characterized in that: The outer surface of the cover (205) is made of black matte material.

11. The photovoltaic power generation device according to any one of claims 2, characterized in that: A scraper strip (209) is provided on the outer cover shell (201).

12. The photovoltaic power generation device according to claim 11, characterized in that: The scraper (209) is made of any one of silica gel, rubber, hard plastic and a brush.

13. The photovoltaic power generation device according to claim 1, characterized in that: The driving device comprises a tubular motor (207) rotatably connected to the reel (204) and a control unit (208).

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