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International Journal of Photoenergy
Volume 2013 (2013), Article ID 837310, 13 pages
Research Article

Operation of TUT Solar PV Power Station Research Plant under Partial Shading Caused by Snow and Buildings

1Department of Electrical Engineering, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland
2ABB Corporate Research, Segelhofstrasse 1K, Baden-Dättwil, 5405 Aargau, Switzerland

Received 22 January 2013; Accepted 11 June 2013

Academic Editor: Keith Emery

Copyright © 2013 Diego Torres Lobera et al. 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.


A grid connected solar photovoltaic (PV) research facility equipped with comprehensive climatic and electric measuring systems has been designed and built in the Department of Electrical Engineering of the Tampere University of Technology (TUT). The climatic measuring system is composed of an accurate weather station, solar radiation measurements, and a mesh of irradiance and PV module temperature measurements located throughout the solar PV facility. Furthermore, electrical measurements can be taken from single PV modules and strings of modules synchronized with the climatic data. All measured parameters are sampled continuously at 10 Hz with a data-acquisition system based on swappable I/O card technology and stored in a database for later analysis. The used sampling frequency was defined by thorough analyses of the PV system time dependence. Climatic and electrical measurements of the first operation year of the research facility are analyzed in this paper. Moreover, operation of PV systems under partial shading conditions caused by snow and building structures is studied by means of the measured current and power characteristics of PV modules and strings.