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Improved model for circumsolar irradiance calculation as an extended light source and spectral implications for high-concentration photovoltaic devices

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journal contribution
posted on 10.12.2015, 14:33 by Ian Cole, Ralph Gottschalg
With concentrator photovoltaics (CPV) technology soon to enter a phase of further development in the USA Sunbelt region, it is imperative to update the predictive tools associated with the technology. This involves modeling the Sun as an extended light source with particular attention to circumsolar irradiance. An improvement to the standard extended light source solar profile model is presented based on an improved parameterization of the circumsolar irradiance. A case study for a solar profile pertaining to a circumsolar ratio (CSR) of 0.3 shows incident direct normal irradiance collection overestimations in the standard model of 0.5%–1.5%. The model presented here mitigates these errors and corrects for a misrepresentation of CSR in the standard model. For an input CSR resolution of 0.01, the mean and standard deviation of normalized output CSR are improved from 0.937 and 0.107 to 1.000 and 0.005. Furthermore, a model extension is presented, incorporating the spectral distribution differences in the central solar and circumsolar regions. A banded spectral analysis of CSR and air mass variation effects are presented, corresponding to the subcells of the multijunction cell architecture. Significant differences are found in the trends of each subcell regarding the relationship between these variables and usable input irradiance.

Funding

This work was supported by a joint U.K.– India initiative in solar energy through a joint project “Stability and Performance of Photovoltaics” funded by Research Councils UK Energy Program in the U.K. under Contract EP/H040331/1 and by the Department of Science and Technology in India.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Journal of Photovoltaics

Citation

COLE, I.R. and GOTTSCHALG, R., 2016. Improved model for circumsolar irradiance calculation as an extended light source and spectral implications for high-concentration photovoltaic devices. IEEE Journal of Photovoltaics, 6 (1), pp. 258-265.

Publisher

IEEE

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VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Publication date

2015

Notes

This is an Open Access article licensed under a Creative Commons Attribution 3.0 Unported Licence.

ISSN

2156-3381

Language

en

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