Analysis of initial stabilization of cell efficiency in amorphous silicon photovoltaic modules under real outdoor conditions

RENEWABLE ENERGY

卷:120

Article

Mateo, C.¹  Hernandez-Fenollosa, M. A.¹  Montero, A.¹  Segui-Chilet, S.¹ 

[1] Univ Politecn Valencia, Camino Vera S-N, E-46022 Valencia, Spain

关键词: Long-term PV measures;    Staebler-Wronski effect;    a-Si:H stabilization;    Real outdoor conditions;    Light induced degradation effect (LID);   

DOI  :  10.1016/j.renene.2017.12.054

来源: Elsevier

【 摘 要 】

This contribution presents a field study in which the initial stabilization of thin-film amorphous silicon (a-Si:H) is investigated. Two grid-connected a-Si:H photovoltaic plants have been monitored and analyzed under real outdoor conditions. A per-unit approach is proposed to compare PV plants with differences in their electrical characteristic and the start-up date. The representation of a normalized per unit PV power versus the accumulated incoming irradiation reveals an evolution that can be characterized through an exposure-response function. By this function, two populations of defects in the cells are detected. It is found that the stabilization process in the first year of operation produces a decrease of 10% in the peak power, equivalent to a decrease of 0.5% in cell efficiency. The use of the accumulated PSH for conducting the analysis of the initial stabilization produces similarities that cannot be obtained if a time scale is used. These results provide a powerful tool for PV plant designers because they enable a prediction to be made of the time-scale stabilization response in terms of unitary power, correlated with the peak sun hours received. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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