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International Journal of Photoenergy
Volume 2014, Article ID 376504, 7 pages
Research Article

Development of a Stochastic Hourly Solar Irradiation Model

Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, 1000 Ljubljana, Slovenia

Received 27 May 2013; Revised 28 October 2013; Accepted 4 January 2014; Published 17 February 2014

Academic Editor: Niyaz Mohammad Mahmoodi

Copyright © 2014 Kristijan Brecl and Marko Topič. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We have developed a new solar irradiation model and implemented it in the SunIrradiance photovoltaic cell/module simulator. This model uses stochastic methods to generate the hourly distribution of solar irradiation on a horizontal or inclined surface from monthly irradiation values on the horizontal surface of a selected location and was verified with the measured irradiance data in Ljubljana, located in Central Europe. The new model shows better simulation results with regard to the share of the diffuse irradiation in the region than the other models. The simulation results show that the new solar irradiation model is excellent for photovoltaic system simulations of single junction PV technologies.