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Determining Intra-hour Solar Irradiance Variability with a Low-cost Solar Logger Network
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group)ORCID iD: 1-6586-4932
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group)
2014 (English)In: Proceedings of 4th International Workshop on Integration of Solar Power into Power Systems, Berlin, Germany, 10-11 November, 2014, 2014Conference paper, Published paper (Other academic)
Abstract [en]

The study of solar irradiance is of vital importance in order to quantify the fluctuation that the transmission system needs to handle in case of large scale solar power integration. In this paper, early results from a low-cost solar irradiance logger network are presented. The main advantages of the solar logger are its low cost (~$50) and mobility. Our results confirm previous models of the station pair correlation of clear sky index step changes, with the modification that the isotropic correlation appears to decrease exponentially as a function of Δt-1/2 rather than Δt-1 as has been proposed earlier.

Place, publisher, year, edition, pages
2014.
National Category
Energy Systems
Research subject
Engineering Science
Identifiers
URN: urn:nbn:se:uu:diva-239146ISBN: 9783981654905 (print)OAI: oai:DiVA.org:uu-239146DiVA: diva2:773342
Conference
4th International Workshop on Integration of Solar Power into Power Systems, Berlin, Germany, 10-11 November, 2014
Available from: 2014-12-18 Created: 2014-12-18 Last updated: 2017-09-15
In thesis
1. Solar Variability Assessment and Grid Integration: Methodology Development and Case Studies
Open this publication in new window or tab >>Solar Variability Assessment and Grid Integration: Methodology Development and Case Studies
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

During the 21st century there has been a tremendous increase in grid-connected photovoltaic (PV) capacity globally, due to falling prices and introduction of economic incentives. PV systems are in most cases small-scale, installed on residential dwellings, which means that the power production is widely distributed and close to the end-user of electricity. In this licentiate thesis the distributed PV in the built environment is studied. A methodology for assessing short-term (sub-minute) solar variability was developed, which in the continuation of this PhD project could be used to study the aggregated impact on the local distribution grid from dispersed PV systems. In order to identify potential locations for PV systems in a future scenario, methodology was developed to assess the rooftop topography on both local level using LiDAR data and nationally through building statistics. Impacts on the distribution grid were investigated through a case study on a rural municipality in Sweden. It was found that the hosting capacity, i.e. the amount of PV power generation that can be integrated in the grid without exceeding certain power quality measures, is high, at least 30%. However, the hosting capacity on transmission level needs further investigation. As a first step a methodology was developed in order to model scenarios for hourly solar power generation, aggregated over wide areas, here applied to the whole Swedish power system. The model showed high correlation compared to PV power production reported to the Swedish transmission system operator (TSO). Furthermore, it was used to model scenarios of high PV penetration in Sweden, which give some indications on the impact on the power system, in terms of higher frequency of extreme ramps.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, Department of Engineering Sciences, 2015. 55 p.
Keyword
Solar variability, Photovoltaics, Grid integration, GIS, Distributed generation
National Category
Energy Systems
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-265451 (URN)
Presentation
2015-11-25, ITC 1111, Lägerhyddsvägen 1, Uppsala, 14:00 (English)
Opponent
Supervisors
Funder
StandUp
Available from: 2016-01-12 Created: 2015-10-29 Last updated: 2016-01-12Bibliographically approved

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Lingfors, DavidZimmermann, UweWidén, Joakim

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