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|Title:||Hourly Solar Radiation Database for Eastern Europe and Asia, Validation and Applications to PV Performance Estimates|
|Authors:||GRACIA AMILLO ANA; HULD Thomas; MUELLER Richard|
|Citation:||29th European photovoltaic solar energy conference and exhibition p. 2584-2588|
|Type:||Articles in periodicals and books|
|Abstract:||Solar radiation data retrieved from satellite images are widely used to estimate the performance of PV and other solar energy systems. A number of organizations provide free or commercial data for Europe and Africa, based on the Meteosat family of geostationary satellites located at a longitude of 0°, covering a region which is commonly known as PRIME. However, until now there have been no freely available data based on the eastern Meteosat satellites situated above the Indian Ocean, covering eastern Europe and Africa, as well as most of Asia (EAST region). Here we report on a new database of hourly solar radiation data based on Meteosat East satellite images. The visible-band satellite images have been used with a Heliosat-type method to calculate the effective cloud albedo (CAL). The global and direct irradiance are then calculated by the clear-sky radiative transfer model SPECMAGIC using the CAL data together with climatologies of aerosol, water vapour and ozone. Due to the few stations and very small number of high-quality solar radiation measurements in the part of Asia covered by Meteosat East (EAST region), the validation of the method has been supplemented by calculations using images from the same class of satellites situated at 0° longitude until 2005. In this way the method can be validated using the larger number of ground stations situated in the PRIME region, which are mainly in Europe. Validation results show that the overall MBE is low, 1.675W/m2, with a relative MBE of 0.86%. However, at individual locations the rMBE may be considerably higher as it is for Ispra (Italy) 9.02% or Carpentras (France) 5.47%. In order to get an idea of the local uncertainty, the root-mean square of the stations’ rMBE values was calculated. Using all the available ground stations, the RMSE of the individual rMBE values is 0.77%. The available satellite data cover the period from 1998 to 2013 with a hiatus in 2006, which is sufficiently long to calculate the long-term averages of solar irradiation needed to accurately estimate the energy output of solar energy systems. This new hourly solar radiation data base will be integrated in the PVGIS web application allowing users to estimate solar radiation and PV output for any location within the region covered by the new solar radiation database.|
|JRC Directorate:||Energy, Transport and Climate|
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