A data processing algorithm for the perforated shadow band incorporating a ray trace model of pyranometer exposure

Michael J. Brooks; Lance W. Roberts

doi:10.1117/12.860123

19 August 2010 A data processing algorithm for the perforated shadow band incorporating a ray trace model of pyranometer exposure

Michael J. Brooks, Lance W. Roberts

Author Affiliations +

Proceedings Volume 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III; 77730W (2010) https://doi.org/10.1117/12.860123
Event: SPIE Solar Energy + Technology, 2010, San Diego, California, United States

Abstract

A preliminary assessment of perforated shadow band performance is given under partly cloudy and overcast conditions. Decomposition of daily 1-minute pyranometer data into diffuse and global values and subsequent reconstitution of the separate curves is achieved using an interpolating algorithm and a ray trace model of pyranometer exposure. Accuracy of the reconstituted curves relative to reference data is a strong function of clearness index, K_T, with a reduction in relative error for K_T < 0.3 and K_T > 0.7. As expected, algorithm performance degrades under highly variable conditions, when interpolation fails to capture the instantaneous fluctuations in irradiance associated with clouds drifting into the sun path.

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Michael J. Brooks and Lance W. Roberts "A data processing algorithm for the perforated shadow band incorporating a ray trace model of pyranometer exposure", Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 77730W (19 August 2010); https://doi.org/10.1117/12.860123

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