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Dish-based high concentration PV system with Köhler optics.

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    |May 7, 2014
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    This study details a high concentration photovoltaic system using a paraboloidal mirror to power triple-junction cells. The novel XRX-Köhler optical design achieved 28% efficiency, with future systems projected to reach 32%.

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    Area of Science:

    • Renewable Energy
    • Optical Engineering
    • Photovoltaics

    Background:

    • High concentration photovoltaic (HCPV) systems are crucial for efficient solar energy conversion.
    • Traditional HCPV designs face challenges in uniform illumination and optical loss.

    Purpose of the Study:

    • To develop and evaluate a novel XRX-Köhler optical system for HCPV applications.
    • To achieve high optical efficiency and uniform light distribution for triple-junction solar cells.

    Main Methods:

    • Designed an XRX-Köhler optical system with a large primary paraboloidal mirror and secondary reflectors.
    • Constructed a prototype with a 3.3m x 3.3m primary reflector focusing light onto 36 actively cooled triple-junction cells.
    • Measured system performance at 1200x geometric concentration.

    Main Results:

    • Achieved a measured end-to-end system conversion efficiency of 28%, including active cooling parasitic losses.
    • Demonstrated uniform illumination and even light distribution across cells.
    • Projected efficiency of ~32% for the next iteration of the system.

    Conclusions:

    • The developed XRX-Köhler optical system offers a robust and efficient solution for HCPV.
    • The design methodology allows for generous tolerance to mis-pointing and efficient series connection of cells.
    • This approach shows significant potential for advancing solar energy conversion efficiency.