Lohmann, Gerald M. and Monahan, Adam H. (2018) Effects of temporal averaging on short-term irradiance variability under mixed sky conditions. Atmospheric measurement techniques, 11 (5). pp. 3131-3144. ISSN 1867-8548

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Official URL: http://dx.doi.org/10.5194/amt-11-3131-2018

Abstract

Characterizations of short-term variability in solar radiation are required to successfully integrate large numbers of photovoltaic power systems into the electrical grid. Previous studies have used ground-based irradiance observations with a range of different temporal resolutions and a systematic analysis of the effects of temporal averaging on the representation of variability is lacking. Using highresolution surface irradiance data with original temporal resolutions between 0.01 and 1 s from six different locations in the Northern Hemisphere, we characterize the changes in representation of temporal variability resulting from time averaging. In this analysis, we condition all data to states of mixed skies, which are the most potentially problematic in terms of local PV power volatility. Statistics of clear-sky index k* and its increments [...] (i.e., normalized surface irradiance and changes therein over specified intervals of time) are considered separately. Our results indicate that a temporal averaging time scale of around 1 s marks a transition in representing single-point irradiance variability, such that longer averages result in substantial underestimates of variability. Higher-resolution data increase the complexity of data management and quality control without appreciably improving the representation of variability. The results do not show any substantial discrepancies between locations or seasons.

Item Type: Article
Subjects: Science and mathematics > Physics
Divisions: Faculty of Mathematics and Science > Institute of Physics (IfP)
Date Deposited: 12 Sep 2019 07:21
Last Modified: 17 Sep 2019 11:00
URI: https://oops.uni-oldenburg.de/id/eprint/4154
URN: urn:nbn:de:gbv:715-oops-42355
DOI: doi:10.5194/amt-11-3131-2018
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