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Analysis of Power Variation and Design Optimization of a-Si PV Modules Considering Shading Effect  

Shin, Jun-Oh (Dept. of Electrical Engineering, Graduate School of Konkuk University)
Jung, Tae-Hee (Dept. of Electrical Engineering, Graduate School of Konkuk University)
Kim, Tae-Bum (Dept. of Electrical Engineering, Graduate School of Konkuk University)
Kang, Ki-Hwan (Korea Institute of Energy Research)
Ahn, Hyung-Keun (Dept. of Electrical Engineering, Graduate School of Konkuk University)
Han, Deuk-Young (Dept. of Electrical Engineering, Graduate School of Konkuk University)
Publication Information
Journal of the Korean Solar Energy Society / v.30, no.6, 2010 , pp. 102-107 More about this Journal
Abstract
a-Si solar cell has relatively dominant drift current when compared with crystalline solar cell due to the high internal electric field. Such drift current make an impact on the PV module in the local shading. In this paper, the a-Si PV module output characteristics of shading effects was approached in terms of process condition, because of the different deposition layer of thin film lead to rising the resistance. We suggested design condition to ensure the long-term durability of the module with regard to the degradation factors such as hot spot by analyzing the module specification. The result shows a remarkable difference on module uniformity for each shading position. In addition, the unbalanced power loss due to power mismatch of each module could intensify the degradation.
Keywords
Photovoltaic Module; Shading effect; Mismatch error; Breakdown voltage; Uniformity;
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