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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/25062

Title: Compensation of temporal averaging bias in solar irradiance data
Authors: Gibson, Keith
Cole, Ian R.
Goss, Brian
Betts, Thomas R.
Gottschalg, Ralph
Keywords: Solar irradiance
Solar irradiation
Solar PV
Solar thermal
Clearness index
Accuracy
Uncertainty
Correction algorithm
Issue Date: 2017
Publisher: Institution of Engineering and Technology (IET)
Citation: GIBSON, K. ... et al, 2017. Compensation of temporal averaging bias in solar irradiance data. IET Renewable Power Generation, doi:10.1049/iet-rpg.2016.0903.
Abstract: Solar irradiance data is used for the prediction of solar energy system performance but is presently a significant source of uncertainty in energy yield estimation. This also directly affects the expected revenue, so the irradiance uncertainty contributes to project risk and therefore the cost of finance. In this paper, the combined impact of temporal averaging, component deconstruction and plane translation mechanisms on uncertainty is analysed. A new method to redistribute (industry standard) hourly averaged data is proposed. This clearness index redistribution method is based on the statistical redistribution of clearness index values and largely corrects the bias error introduced by temporal averaging. Parameters for the redistribution model were derived using irradiance data measured at high temporal resolution by CREST, Loughborough University, over a 5 year period. The root mean square error (RMSE) of example net annual (2014) diffuse, beam and global yield of hourly averaged data were reduced from approximately 15% to 1%, 14% to 3% and 4% to 1%, respectively.
Description: This is an Open Access Article. It is published by IET under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/. The accepted version will be replaced with the published version once available.
Sponsor: This work has been conducted as part of the research project ‘PV2025 - Potential Costs and Benefits of Photovoltaic for UK Infrastructure and Society’ project which is funded by the RCUK's Energy Programme (contract no: EP/K02227X/1).
Version: Published
DOI: 10.1049/iet-rpg.2016.0903
URI: https://dspace.lboro.ac.uk/2134/25062
Publisher Link: https://doi.org/10.1049/iet-rpg.2016.0903
ISSN: 1752-1416
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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