A shadow fault detection method based on the standard error analysis of I-V curves

RENEWABLE ENERGY

卷:99

Article

Bressan, M.¹  El Basri, Y.¹  Galeano, A. G.³  Alonso, C.^1,2 

[1] CNRS, LAAS, 7 Ave Colonel Roche, F-31077 Toulouse, France

[2] Univ Toulouse, UPS, INSA, LAAS, F-31400 Toulouse, France

[3] Univ Los Andes, Dept Elect & Elect Engn, Bogota, Colombia

关键词: Thermal dissipation;    I-V curves analysis;    Shading problems;    First derivative calculation;    Fault detection;   

DOI  :  10.1016/j.renene.2016.08.028

来源: Elsevier

【 摘 要 】

Shading on photovoltaic (PV) modules induces disproportionate impacts on power production. This paper presents a fault detection method able to identify anomalies on PV systems such as shading problems. The presence of localized shading on PV modules leads to an overheating of the shaded PV cells despite the activation of by-pass diodes. The temperature increase reduces considerably PV module performances and its lifetime. The presented method uses a simple equation, which corresponds to the normalized error (DE) of the comparison between the I-V curve in normal operation and the I-V curve in shading condition. The first derivative calculation gives the area of the detection in function of the PV voltage of the module (DE/DV). This defines whether one or several PV cells dissipate power. This phenomenon essentially occurs in the case of non-uniform irradiance received on PV modules and could impact PV modules performances. The detection method is explained in detail through the study of specific shadows simulations on PV modules. The results are validated through experimental tests on PV modules. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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