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Improving the satellite retrieval of surface solar irradiance during an eclipse

Roy, Arindam and Hammer, Annette and Schroedter-Homscheidt, Marion and Lezaca Galeano, Jorge Enrique and Azam, Faiza and Lünsdorf, Ontje and Heinemann, Detlev and Saint-Drenan, Yves-Marie (2023) Improving the satellite retrieval of surface solar irradiance during an eclipse. In: EGU General Assembly 2023. EGU General Assembly 2023, 23-28 Apr. 2023, Wien, Österreich. doi: 10.5194/egusphere-egu23-17290.

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Official URL: https://meetingorganizer.copernicus.org/EGU23/EGU23-17290.html


Solar eclipse causes high magnitude fluctuations in the Surface Solar Irradiance (SSI) for a short duration and consequently reduces the output of solar PV systems. Grid operators try to estimate the impending loss in PV power generation prior to the occurrence of an eclipse in order to schedule conventional generators for compensating the loss. The worldwide installed capacity of grid connected solar PV systems is expected to steeply rise in the coming decade as a result of the various policy initiatives aimed to tackle the climate change. In future electric supply networks with a high penetration of solar PV systems, such large ramps in generation could impact the stability of the network. Although a solar eclipse is a purely deterministic phenomenon, it’s impact on the satellite retrieval of Surface Solar Irradiance (SSI) is complicated due to the possibility of cloud presence in the regions affected by the eclipse. The extraterrestrial solar irradiance is reduced by the moon during an eclipse. On the one hand this causes clouds to appear darker and they get assigned lower reflectance values than they should have in reality. This leads to predicting higher values for the solar irradiance under these clouds than expected. On the other hand, the eclipse also reduces the clear sky irradiance reaching the earth surface. We developed a method to make corrections for both of these effects on the High Resolution Visible (HRV) channel images from Meteosat-11 The results are validated against ground measurements of irradiance provided by BSRN, IEA-PVPS, DTN and the National Weather Services networks. The validation is performed for sites with locations across Europe and for the last two eclipses.

Item URL in elib:https://elib.dlr.de/195095/
Document Type:Conference or Workshop Item (Speech)
Title:Improving the satellite retrieval of surface solar irradiance during an eclipse
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Roy, ArindamUNSPECIFIEDhttps://orcid.org/0000-0002-4866-571XUNSPECIFIED
Hammer, AnnetteUNSPECIFIEDhttps://orcid.org/0000-0002-5630-3620UNSPECIFIED
Schroedter-Homscheidt, MarionUNSPECIFIEDhttps://orcid.org/0000-0002-1854-903XUNSPECIFIED
Lezaca Galeano, Jorge EnriqueUNSPECIFIEDhttps://orcid.org/0000-0001-5513-7467UNSPECIFIED
Date:25 April 2023
Journal or Publication Title:EGU General Assembly 2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Solar Irradiance, Remote Sensing, Heliosat-3, Solar Eclipse, Obscuration Fraction, Reflectivity
Event Title:EGU General Assembly 2023
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:23-28 Apr. 2023
HGF - Research field:Energy
HGF - Program:Energy System Design
HGF - Program Themes:Energy System Transformation
DLR - Research area:Energy
DLR - Program:E SY - Energy System Technology and Analysis
DLR - Research theme (Project):E - Systems Analysis and Technology Assessment
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Energy Systems Analysis, OL
Deposited By: Roy, Arindam
Deposited On:08 Jun 2023 11:08
Last Modified:08 Jun 2023 11:08

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