Photovoltaic power generation system with selective reflection film

A photovoltaic power generation system and a technology of selective reflection, applied in the field of solar energy, can solve the problems of inability to convert, affect safe operation, and reduce the photoelectric conversion efficiency due to the heat of solar cells, so as to improve the utilization rate, avoid heat generation, and ensure the effect of reflection efficiency.

Pending Publication Date: 2021-07-23
华能陕西发电有限公司 +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional photovoltaic modules can only use the energy of short and medium wavelength bands (such as wavelength <1100nm) of solar energy; in the prior art, there is a technology that uses ordinary reflective film to directly reflect light to the back of the photovoltaic module, although the back radiation is increased, but The long-wave energy in it can not be converted into electrical energy, but it will also cause the solar cell to heat up and reduce its photoelectric conversion efficiency, which will affect the safe operation.

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  • Photovoltaic power generation system with selective reflection film
  • Photovoltaic power generation system with selective reflection film
  • Photovoltaic power generation system with selective reflection film

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Embodiment approach

[0036] Beamsplitters are used to reflect and transmit light. According to different spectral characteristics, beamsplitters can be divided into neutral beamsplitters and dichroic beamsplitters. A neutral beamsplitter can split a beam of light into two beams of the same spectral composition; a dichroic beamsplitter can reflect one part of the spectrum and transmit the other part.

[0037] The present invention is a photovoltaic power generation system with a selective reflection film, which uses a reflection film with a cut-off wavelength of 900 nm. The reflective film used in the present invention splits the solar spectrum at 900 nm to divide the solar spectrum into two parts: long-wave and short-wave. The 900nm cut-off wavelength can select GaAs single-cell solar cells, single-cell dye-sensitized solar cells, single-junction silicon thin-film solar cells, crystalline silicon solar cells, cadmium telluride solar cells and copper indium gallium selenide solar cells.

Embodiment 1

[0039] see figure 1 As shown, the present invention provides a photovoltaic power generation system with a selective reflection film, including a reflection film and a photovoltaic assembly 30 .

[0040] The working angle of the reflective film is 45°, and the included angle between the reflective film and the photovoltaic module 30 is 45°. The photovoltaic assembly 30 is disposed on the reflective side of the reflective film.

[0041] The sunlight is vertically incident to the reflective film set at 45°, and the short-wavelength light energy of wavelengths below 900nm is reflected to the surface of the photovoltaic module 30 for photovoltaic power generation, and the long-wavelength light energy of wavelengths above 900nm is transmitted, which can effectively avoid direct solar radiation in the infrared band. When it shines on the surface of photovoltaic modules, it can control the temperature rise of photovoltaic modules and avoid the technical problem that the efficiency o...

Embodiment 2

[0043] see figure 2 As shown, the reflective film in the present invention includes a substrate 10 and a coating film disposed on the substrate; the coating film includes a first material coating layer 11 and a second material coating layer 12 that are sequentially overlapped and disposed on the substrate. The bottom layer and the topmost layer of the coating are both coating layers of the first material. The first material coating layer 11 and the second material coating layer 12 are respectively a high refractive index material coating layer and a low refractive index material coating layer.

[0044] The working wavelength of the reflective film is 400-1800nm, and the substrate 10 is a hard material: aluminum sheet, steel sheet, copper sheet, glass sheet, quartz sheet, borosilicate material, etc., or flexible plastic substrate (EVA film, PI film, etc.) .

[0045] The working angle of the reflective film designed in the present invention is 45°, the transmittance in the 40...

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Abstract

The invention discloses a photovoltaic power generation system with a selective reflecting film. The photovoltaic power generation system comprises a reflecting film and a photovoltaic module; the working angle of the reflecting film is 45 DEG; the included angle between the reflecting film and the photovoltaic module is 45 DEG; the photovoltaic module is arranged on the reflecting side of the reflecting film; the reflecting film comprises a substrate and a coating film arranged on the substrate; the coating film comprises a first material coating film layer and a second material coating film layer which are sequentially arranged on the substrate in an overlapping manner; the bottom layer and the topmost layer of the coating film are first material coating film layers; and the first material coating layer and the second material coating layer are made of materials with different refractive indexes. According to the invention, through the coating design, the reflecting film is used for splitting solar energy and dividing a solar spectrum into two parts, namely a long wave part and a short wave part, and short-wave-band light energy is reflected on the mirror surface of the reflecting film for photovoltaic use, so that temperature rise of the photovoltaic module caused by direct irradiation of infrared long waves on the back surface of the double-sided photovoltaic module is avoided, therefore, the photovoltaic module works at a temperature with higher photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar energy, and particularly relates to a photovoltaic power generation system with a selective reflection film. Background technique [0002] 76% of my country's land has abundant sunlight, and the distribution of light energy resources is relatively uniform. Photovoltaic power generation has no noise and pollutant emissions. The application technology is mature, safe and reliable. [0003] Solar energy is the cleanest, safest and most reliable energy source in the future. Developed countries are taking the development and utilization of solar energy as the main content of their long-term plans for the energy revolution. The photovoltaic industry is increasingly becoming another explosively developing industry after the IT and microelectronics industries. [0004] Photovoltaic modules for photovoltaic power generation are composed of high-efficiency crystalline silicon solar cells, backplanes and frame...

Claims

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Application Information

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IPC IPC(8): H02S40/22G02B5/08
CPCG02B5/0833H02S40/22Y02E10/52
Inventor 宋戈彭文博郑清伟高虎房小源齐国营王本忠郭春友吴智强李晓磊田鸿翔马铭远
Owner 华能陕西发电有限公司
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