Intra-hour forecasting with a total sky imager at the UC San Diego solar energy testbed
In: Solar energy, Jg. 85 (2011), Heft 11, S. 2881-2893
academicJournal
- print, 3/4 p
Zugriff:
A method for intra-hour, sub-kilometer cloud forecasting and irradiance nowcasting using a ground-based sky imager at the University of California, San Diego is presented. Sky images taken every 30 s were processed to determine sky cover using a clear sky library and sunshine parameter. From a two-dimensional cloud map generated from coordinate-transformed sky cover, cloud shadows at the surface were estimated. Limited validation on four partly cloudy days showed that (binary) cloud conditions were correctly nowcast 70% of the time for a network of six pyranometer ground stations spread out over an area of 2 km2. Cloud motion vectors were generated by cross-correlating two consecutive sky images. Cloud locations up to 5 min ahead were forecasted by advection of the two-dimensional cloud map. Cloud forecast error increased with increasing forecast horizon due to high cloud cover variability over the coastal site.
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Intra-hour forecasting with a total sky imager at the UC San Diego solar energy testbed
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Autor/in / Beteiligte Person: | CHI WAI, CHOW ; URQUHART, Bryan ; LAVE, Matthew ; DOMINGUEZ, Anthony ; KLEISSL, Jan ; SHIELDS, Janet ; WASHOM, Byron |
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Zeitschrift: | Solar energy, Jg. 85 (2011), Heft 11, S. 2881-2893 |
Veröffentlichung: | Kidlington: Elsevier, 2011 |
Medientyp: | academicJournal |
Umfang: | print, 3/4 p |
ISSN: | 0038-092X (print) |
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