Concentrating photovoltaic system based on beam splitting element

Abstract

A concentrating photovoltaic system based on a beam splitting element comprises a beam splitting element which is used for dividing incident light into at least two emergent light beams and which is atransmissive grating or reflective grating; a plurality of concentrating elements disposed on the optical paths of the respective emergent light beams, wherein each concentrating element is configured to converge the emergent light beams on the optical path into a single concentrated light beam; a plurality of photovoltaic elements disposed on the optical paths of the respective concentrated light beams and configured to convert the concentrated light into photovoltaic energy. Through the splitting and concentrating of the beam splitting element and the concentrating elements, the photovoltaic cells having different PN junctions disposed at a rear end can obtain the matched solar spectral bands and the appropriate amount of solar radiant energy, such that the current output from each PN junction of the photovoltaic cells achieves a uniform output effect, thereby contributing to further improving the photoelectric conversion efficiency of the solar cell.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a light-splitting element-based concentrating photovoltaic system. Background technique [0002] After decades of development, solar power generation technology has established its important position in the field of new energy. Photovoltaic cells are the core devices of solar power generation, and their photoelectric conversion efficiency directly affects the performance of the entire power generation system. How to improve the photoelectric conversion efficiency of photovoltaic cells and the power generation efficiency of photovoltaic systems has always been the goal pursued by researchers in the field of solar power generation. [0003] As we all know, the core of a solar cell is a PN junction. A PN junction corresponds to a fixed band gap, which can only absorb photons in a specific wavelength range and has the highest absorption efficiency for light of a...

AI Technical Summary

Problems solved by technology

[0005] Under the standard spectral distribution of AM1.5d, Ga 0.50 In 0.50 P subcell and Ga 0.99 In 0.01 The current obtained by the As sub-battery is relatively matched, and the current obtained by the Ge sub-battery is relatively large. This current mismatch will cause the Ge sub-battery to not achieve the best working condition, so that the long-wavelength light is not fully utilized.

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