Title: CLEARNESS-BASED SKY TAXONOMY AND PREDICTIONS FOR TWO DIFFERENT LOCATIONS
Authors: PAVANELLO DIEGOZAAIMAN WillemCOLLI AlessandraHEISER JohnSMITH Scott
Citation: Proceedings of the 28th European Photovoltaic Solar Energy Conference and Exhibition p. 3649-3655
Publisher: WIP Munich
Publication Year: 2013
JRC N°: JRC84905
ISBN: 3-936338-33-7
URI: http://www.eupvsec-proceedings.com/proceedings?paper=22584
http://publications.jrc.ec.europa.eu/repository/handle/JRC84905
DOI: 10.4229/28thEUPVSEC2013-5AO.9.5
Type: Articles in periodicals and books
Abstract: This article presents a taxonomical analysis of the sky conditions, during 2012, for two different sites: the Joint Research Centre site in Ispra (Italy, European Solar Test Installation laboratories) and the site of Brookhaven National Laboratories in Upton (NY – USA). The key parameter is the sky clearness index kT, a dimensionless ratio of the global horizontal irradiance. In the first part, a taxonomical description using daily values of kT is presented, giving a general overview of the sky conditions during the year. In the second part the analysis is performed using short-term averages of the clearness index; remarkable properties of the statistical functions are highlighted and reinforced by using a fuzzy logic method, to extract time independent and site independent subsets. In the third part, a statistical analysis of the clouds intercepting the Sun’s trajectory is given, and finally, in the fourth part, some time-dependent correlations between the irradiance and other meteorological variables are studied.
JRC Directorate:Energy, Transport and Climate

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