Lohmann, Gerald M. and Monahan, Adam H. and Heinemann, Detlev (2016) Local short-term variability in solar irradiance. Atmospheric chemistry and physics, 16 (10). pp. 6365-6379. ISSN 1680-7324
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Abstract
Characterizing spatiotemporal irradiance variability is important for the successful grid integration of increasing numbers of photovoltaic (PV) power systems. Using 1 Hz data recorded by as many as 99 pyranometers during the HD(CP)2 Observational Prototype Experiment (HOPE), we analyze field variability of clear-sky index k* (i.e., irradiance normalized to clear-sky conditions) and sub-minute k* increments (i.e., changes over specified intervals of time) for distances between tens of meters and about 10 km. By means of a simple classification scheme based on k* statistics, we identify overcast, clear, and mixed sky conditions, and demonstrate that the last of these is the most potentially problematic in terms of short-term PV power fluctuations. Under mixed conditions, the probability of relatively strong k* increments of ±0.5 is approximately twice as high compared to increment statistics computed without conditioning by sky type. Additionally, spatial autocorrelation structures of k* increment fields differ considerably between sky types. While the profiles for overcast and clear skies mostly resemble the predictions of a simple model published by Hoff and Perez (2012), this is not the case for mixed conditions. As a proxy for the smoothing effects of distributed PV, we finally show that spatial averaging mitigates variability in k* less effectively than variability in k* increments, for a spatial sensor density of 2 km<sup>-2</sup>.
| Item Type: | Article |
|---|---|
| Additional Information: | Publiziert mit Hilfe des DFG-geförderten Open Access-Publikationsfonds der Carl von Ossietzky Universität Oldenburg. |
| Subjects: | Science and mathematics > Physics Science and mathematics > Earth sciences and geology |
| Divisions: | Faculty of Mathematics and Science > Institute of Physics (IfP) |
| Date Deposited: | 19 Sep 2017 10:24 |
| Last Modified: | 20 Dec 2017 11:25 |
| URI: | https://oops.uni-oldenburg.de/id/eprint/3247 |
| URN: | urn:nbn:de:gbv:715-oops-33288 |
| DOI: | 10.5194/acp-2016-2 |
| Nutzungslizenz: |
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