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Application of Whole Sky Imagers for Data Selection for Radiometer Calibration

Wilbert, Stefan and Nouri, Bijan and Prahl, Christoph and Garcia, G. and Ramirez, Lourdes and Zarzalejo, L.F. and Valenzuela, Rita and Ferrera, F. and Kozonek, N. and Liria, J. (2016) Application of Whole Sky Imagers for Data Selection for Radiometer Calibration. In: EU PVSEC 2016 Proceedings, pp. 1493-1498. EU PVSEC, 20. - 24. June 2016, Munich, Germany. DOI: 10.4229/EUPVSEC20162016-5AO.8.6 ISBN 3-936338-41-8

Full text not available from this repository.

Official URL: https://www.eupvsec-proceedings.com/proceedings?fulltext=wilbert&paper=38949

Abstract

The accurate measurement of shortwave solar irradiance is essential for the planning and operation of photovoltaic plants. The measurement uncertainty caused by the calibration is the most relevant contribution to the overall uncertainty of radiometers. During the outdoor calibration of radiometers the meteorological conditions have to be observed carefully and data points collected under unfavorable conditions must be rejected. The rejection criteria concern the level of the involved irradiances, wind speed and –direction, and also the cloud conditions. The latter are quantified in terms of the minimum angular distance of clouds from the sun and are usually determined visually by an observer. A purely manual visual determination of the cloud’s angular distance from the sun is time consuming and often inaccurate. We developed an algorithm for whole sky imagers (WSIs) that allows the determination of the minimum angular distance of clouds from the sun and the automatic filtering of the calibration data. The high importance of the cloud filtering for pyranometer calibration is shown with an exemplary calibration result for nine pyranometers. The effect of the cloud filtering for pyrheliometer calibration has shown to be negligible for this example. The filtering method increases the calibration quality and noticeably reduces the personnel effort for pyranometer calibration.

Item URL in elib:https://elib.dlr.de/105471/
Document Type:Conference or Workshop Item (Speech)
Additional Information:https://www.eupvsec-proceedings.com/proceedings/download
Title:Application of Whole Sky Imagers for Data Selection for Radiometer Calibration
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wilbert, StefanStefan.Wilbert (at) dlr.dehttps://orcid.org/0000-0003-3573-3004
Nouri, BijanBijan.Nouri (at) dlr.deUNSPECIFIED
Prahl, ChristophChristoph.Prahl (at) dlr.deUNSPECIFIED
Garcia, G.UNSPECIFIEDUNSPECIFIED
Ramirez, LourdesCIEMATUNSPECIFIED
Zarzalejo, L.F.UNSPECIFIEDUNSPECIFIED
Valenzuela, RitaCIEMATUNSPECIFIED
Ferrera, F.UNSPECIFIEDUNSPECIFIED
Kozonek, N.SF-QLFUNSPECIFIED
Liria, J.UNSPECIFIEDUNSPECIFIED
Date:2016
Journal or Publication Title:EU PVSEC 2016 Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.4229/EUPVSEC20162016-5AO.8.6
Page Range:pp. 1493-1498
ISBN:3-936338-41-8
Status:Published
Keywords:Calibration, Pyranometer, Radiometer, Cloud Detection, Whole Sky Imager
Event Title:EU PVSEC
Event Location:Munich, Germany
Event Type:international Conference
Event Dates:20. - 24. June 2016
Organizer:EU PVSEC
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Impact of Desert Environment (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:27 Jul 2016 14:31
Last Modified:22 May 2017 14:09

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