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International Journal of Photoenergy
Volume 2015, Article ID 907282, 8 pages
http://dx.doi.org/10.1155/2015/907282
Research Article

Safety Analysis of Solar Module under Partial Shading

1Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
2Guangdong Fivestar Solar Energy Co., Ltd., Liuchongwei Industrial Area, Wanjiang District, Dongguan, Guangdong Province 523051, China
3School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

Received 24 July 2015; Revised 14 November 2015; Accepted 16 November 2015

Academic Editor: Elias Stathatos

Copyright © 2015 Wei He 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.

Abstract

Hot spot often occurs in a module when the qualities of solar cells mismatch and bypass diodes are proved to be an efficient alternative to reduce the effect of hot spot. However, these principles choosing a diode are based on the parameters of bypass diodes and PV cells without consideration of the maximum heating power of the shaded cell, which may cause serious consequences. On this basis, this paper presents a new approach to investigate partially shaded cells in different numbers of PV cells and different shading scenarios, including inhomogeneous illumination among solar cells and incomplete shading in one cell, which innovatively combines the same cells or divides one affected cell into many small single cells and then combines the same ones, and analyzes the shaded cell. The results indicate that the maximum power dissipation of the shaded cell occurs at short-circuit conditions. With the number of solar cells increasing, the shaded cell transfers from generating power to dissipating power and there is a maximum point of power dissipation in different shading situations that may lead to severe hot spot. Adding up the heat converted from solar energy, the heating power can be higher. In this case, some improvements about bypass diodes are proposed to reduce hot spot.