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Characteristics of a low-cost solar irradiance logger
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)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Since photovoltaic (PV) power is highly intermittent the impact on the power system has been studied more thoroughly the last few years. However, there is a lack of high resolution data needed for solar variability studies, which demand dense solar irradiance monitoring networks. Here we present a silicon cell based data logger gathering global irradiance data with sampling intervals down to one second. In all it costs around \euro 40, making it significantly cheaper than commercial products, but also cheaper compared to similar dataloggers. It has a root-mean-square error (RMSE) of 16 W/m$^2$ compared to a commercial thermopile pyranometer. Since the solar logger is intended to be used in solar variability studies,the RMSE of the clear sky index step change was studied and was shown to be 0.014 averaged over 5 minutes, and 0.029 averaged over 10 seconds. The low cost yet high accuracy of the logger, combined with its high mobility and and low power consumption makes it a viable choice when designing a monitoring network for solar variability studies or in other solar energy related projects, e.g. in developing countries, where low-cost is important.

National Category
Energy Systems
Identifiers
URN: urn:nbn:se:uu:diva-265448OAI: oai:DiVA.org:uu-265448DiVA: diva2:865700
Available from: 2015-10-29 Created: 2015-10-29 Last updated: 2016-01-12
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
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StandUp
Available from: 2016-01-12 Created: 2015-10-29 Last updated: 2016-01-12Bibliographically approved

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