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Measurement of diffuse and plane of array irradiance by a combination of a pyranometer and an all-sky imager

Blum, Niklas and Wilbert, Stefan and Nouri, Bijan and Lezaca, Jorge and Huckebrink, David and Kazantzidis, Andreas and Heinemann, Detlev and Zarzalejo, L. F. and Jiménez, María José and Pitz-Paal, Robert (2022) Measurement of diffuse and plane of array irradiance by a combination of a pyranometer and an all-sky imager. Solar Energy, 232, pp. 232-247. Elsevier. doi: 10.1016/j.solener.2021.11.064. ISSN 0038-092X.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0038092X21010240


Accurate, robust and cost-efficient measurements of diffuse horizontal irradiance (DHI) and global tilted irradiance (GTI) are of great interest for solar energy applications. However, the available measurement techniques exhibit at least one of these shortcomings: restriction of GTI measurement to a single plane, intensive maintenance, high acquisition cost or increased deviations, especially at new measurement sites. To avoid these shortcomings, we suggest a comparably inexpensive and robust setup of a thermopile pyranometer and an all-sky imager (ASI) for measurement of DHI and GTI. The pyranometer measures global horizontal irradiance (GHI) and our method consecutively estimates diffuse sky radiance, DHI, direct normal irradiance (DNI) and GTI, by merging information from the combined setup. The system is developed and validated at two sites in Spain and Germany. Measurement of GTI is benchmarked for seven planes over GTI derived by transposition based on DHI and DNI from a tracker setup with a pyrheliometer and shaded thermopile pyranometer. Our results indicate that the measurement system can be applied at both sites. The proposed method avoids time-consuming radiometric calibrations of the camera by the combination of both sensors and a self-calibration. The measurement system is promising in particular for measurement of GTI. For 10-min average GTI, our approach yields an rRMSD of 1.6...4.8% for planes with tilts in the range of 20°...61°. Thus, at both sites and for all planes, it outperforms the tracker-based transposition yielding 2.3...6.5%. DHI is measured significantly more accurately than reported in previous works using an ASI alone.

Item URL in elib:https://elib.dlr.de/145345/
Document Type:Article
Title:Measurement of diffuse and plane of array irradiance by a combination of a pyranometer and an all-sky imager
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Blum, NiklasNiklas.Blum (at) dlr.dehttps://orcid.org/0000-0002-1541-7234
Wilbert, StefanStefan.Wilbert (at) dlr.dehttps://orcid.org/0000-0003-3573-3004
Nouri, BijanBijan.Nouri (at) dlr.dehttps://orcid.org/0000-0002-9891-1974
Lezaca, JorgeJorge.Lezaca (at) dlr.deUNSPECIFIED
Kazantzidis, Andreasakaza (at) upatras.grUNSPECIFIED
Heinemann, Detlevdetlev.heinemann (at) dlr.deUNSPECIFIED
Zarzalejo, L. F.lf.zarzalejo (at) ciemat.esUNSPECIFIED
Jiménez, María Josémjimenez (at) psa.esUNSPECIFIED
Pitz-Paal, RobertRobert.Pitz-Paal (at) dlr.dehttps://orcid.org/0000-0002-3542-3391
Date:15 January 2022
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2021.11.064
Page Range:pp. 232-247
Keywords:shortwave radiation; all-sky-imager; global tilted irradiance (GTI); plane of arrayirradiance (POA); transposition; sky radiance
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Condition Monitoring
Location: Köln-Porz , Oldenburg
Institutes and Institutions:Institute of Solar Research > Qualification
Institute of Networked Energy Systems > Energy Systems Analysis, OL
Deposited By: Blum, Niklas
Deposited On:11 Jan 2022 09:42
Last Modified:11 Jan 2022 09:42

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