Citation
Masa Bote, Daniel and Caamaño Martín, Estefanía
(2014).
Methodology for estimating building integrated photovoltaics electricity production under shadowing conditions and case study.
"Renewable and Sustainable Energy Reviews", v. 31
;
pp. 492-500.
ISSN 1364-0321.
https://doi.org/10.1016/j.rser.2013.12.019.
Abstract
Building integrated photovoltaic (BIPV) systems are a relevant application of photovoltaics. In countries belonging to the International Energy Agency countries, 24% of total installed PV power corresponds to BIPV systems. Electricity losses caused by shadows over the PV generator have a significant impact on the performance of BIPV systems, being the major source of electricity losses. This paper presents a methodology to estimate electricity produced by BIPV systems which incorporates a model for shading losses. The proposed methodology has been validated on a one year study with real data from two similar PV systems placed on the south façade of a building belonging to the Technical University of Madrid. This study has covered all weather conditions: clear, partially overcast and fully overcast sky. Results of this study are shown at different time scales, resulting that the errors committed by the best performing model are below 1% and 3% in annual and daily electricity estimation. The use of models which account for the reduced performance at low irradiance levels also improves the estimation of generated electricity.