Title: MSG Data and WEB-GIS for Solar Resource Assessment
Citation: Proceedings of EuroSun 2010, ISBN: 978-3-901425-13-4 p. 1-5
Publisher: International Solar Energy Society
Publication Year: 2010
JRC N°: JRC56981
URI: http://www.eurosun2010.org/
Type: Articles in periodicals and books
Abstract: The Photovoltaic Geographic Information System (PVGIS) has been developed at the Joint Research Centre (JRC), starting in 2001 (http://re.jrc.ec.europa.eu/pvgis/). PVGIS is a database and web service for solar radiation in Europe and Africa; it currently provides performance estimates for photovoltaic (PV) systems with a resolution of 100m, based on calculating the effects of terrain shadowing. It brings an easy to use Google maps type interface. The user can select a site of interest by moving through the maps. The user can select which solar radiation components he is interested in (global or diffuse irradiation). Further, solar electricity potential in Europe has been analyzed assuming fixed-mounted and 2-axis tracking flat-plate PV systems, for several technical and economic options, assuming performance degradation factors such as temperature and reflectivity. PVGIS has achieved a certain level of popularity in the solar energy community. Nevertheless, in a number of areas improvements are needed. The European database is calculated from ground station data collected within the European Solar Radiation Atlas. The spatial resolution varies strongly, and the diffuse irradiation is not known with the same accuracy as the global irradiation. The data represent a period quite far in the past (1981-1990) and only monthly averages are available. For these reasons a new data source, using a satellite-based calculation scheme for solar irradiance is being employed to update the solar radiation database for Europe and Africa, which will be integrated into a new version of PVGIS solar radiation database The algorithm to derive solar irradiance form geostationary satellite (MSG) data is based on the approach proposed by J. Verdebout. This new database will enable a number of new or improved services: The high time resolution of the data will make it possible to calculate the performance of non-grid connected PV systems, as well as studying the impact of solar variability on the electricity grid. Due to the nonlinearity of PV system performance with irradiance and temperature, high time-resolution data can also improve performance estimates relative to the existing calculation scheme An improved database of direct normal irradiation will enable services to estimate the performance of concentrating PV systems In areas with very sparse ground station data the accuracy of solar radiation estimates will be improved. Results from a first version of the new database and the online interface will be presented. The validation of the irradiance retrieval scheme is based on set of 25 ground stations with measurements of global solar irradiance for year 2006. The time step of measurements data ranges from 1 to 60 min. All ground data have been subject of quality checking procedures and all erroneous data have been excluded from analysis. Satellite model quality assessment results will be shown at the conference.
JRC Directorate:Nuclear Safety and Security

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