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Photovoltaïque à concentration : optimisation de l'étage secondaire

Abstract : Concentrating Photovoltaics (CPV) is one of the most promising ways to generate clean energy at potentially reduced costs. The main idea is to use optical elements to concentrate the solar rays on a multi-junction solar cells to take advantage of their high efficiencies. Concentrators for CPV can have very different architectures and optical elements, resulting in a wide variety of possible designs. A typical optical architecture for a CPV concentrator is formed by: a first optical element called the primary optical element (POE) which collects the direct rays of the sun, it can be either refractive or reflective. And a secondary optical element (SOE) that receives light from the primary and sends it to the cell. The main role of this element in a CPV unit is to broaden the angle of acceptance and to homogenize the irradiance distribution on the solar cell. Our research thematic deals with this kind of solar concentrators, it concerns the design, testing and optimization of two-stage CPV units, that use a Fresnel lens as POE. After a detailed bibliographic study, we carried out a comparative study of four solar concentrators dedicated to high concentration photovoltaic systems. These four concentrators are formed from the same Fresnel lens associated to four secondaries: a compound parabolic concentrator (CPC), a crossed compound parabolic concentrator (CCPC), a pyramid and a cone. Four materials with different refractive indices were considered. The Fresnel lens has a diameter d = 350mm and a focal length f = 265mm. Our simulations are performed using the TracePro ray tracing software. The results showed that the pyramid was the best performing SOE. For the experimental test we designed small size prototypes, a parametric analysis was carried out to highlight the main performances of the secondary element, as it is the most critical element in the CPV unit. Experimental set ups have been realized for the indoor and outdoor measurements and characterization of the prototypes. The results show that the measured optical efficiencies and acceptance angles of the CPV units were very close to those obtained by optical simulations. The pyramid gives the best optical efficiency and the widest angle of acceptance. Electrical measurements also confirmed that the best solution for the secondary optic is the pyramid because it shows the higher electrical power and the efficiency. The optical and electrical efficiencies reach respectively 80,81% and 30.77%, these results correspond to the best efficiencies recorded in the literature.
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Submitted on : Friday, September 24, 2021 - 4:26:06 PM
Last modification on : Friday, August 5, 2022 - 9:26:11 AM

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Sara El-Yahyaoui. Photovoltaïque à concentration : optimisation de l'étage secondaire. Energie électrique. Université de Lorraine; Université Sidi Mohamed ben Abdellah (Fès, Maroc), 2021. Français. ⟨NNT : 2021LORR0068⟩. ⟨tel-03354138⟩

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