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Proceedings Paper

Radiometric ratio characterization for low-to-mid CPV modules operating in variable irradiance conditions
Author(s): Shelby Vorndran; Juan Russo; Deming Zhang; Michael Gordon; Raymond Kostuk
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Paper Abstract

In this work, a concentrating photovoltaic (CPV) design methodology is proposed which aims to maximize system efficiency for a given irradiance condition. In this technique, the acceptance angle of the system is radiometrically matched to the angular spread of the site’s average irradiance conditions using a simple geometric ratio. The optical efficiency of CPV systems from flat-plate to high-concentration is plotted at all irradiance conditions. Concentrator systems are measured outdoors in various irradiance conditions to test the methodology. This modeling technique is valuable at the design stage to determine the ideal level of concentration for a CPV module. It requires only two inputs: the acceptance angle profile of the system and the site’s average direct and diffuse irradiance fractions. Acceptance angle can be determined by raytracing or testing a fabricated prototype in the lab with a solar simulator. The average irradiance conditions can be found in the Typical Metrological Year (TMY3) database. Additionally, the information gained from this technique can be used to determine tracking tolerance, quantify power loss during an isolated weather event, and do more sophisticated analysis such as I-V curve simulation.

Paper Details

Date Published: 15 October 2012
PDF: 10 pages
Proc. SPIE 8468, High and Low Concentrator Systems for Solar Electric Applications VII, 846806 (15 October 2012); doi: 10.1117/12.929854
Show Author Affiliations
Shelby Vorndran, College of Optical Sciences, The Univ. of Arizona (United States)
Juan Russo, The Univ. of Arizona (United States)
Deming Zhang, The Univ. of Arizona (United States)
Michael Gordon, College of Optical Sciences, The Univ. of Arizona (United States)
Raymond Kostuk, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 8468:
High and Low Concentrator Systems for Solar Electric Applications VII
Kaitlyn VanSant; Adam P. Plesniak, Editor(s)

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