Field Inspection Of Pv Modules: Quantitative Determination Of Performance Loss Due To Cell Cracks Using El Images
2017 IEEE 44TH PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC)(2017)
摘要
Electroluminescence (EL) imaging has been used by the operation and maintenance companies for a qualitative detection of cells cracks in the fielded photovoltaic (PV) modules. This paper presents our attempts to statistically determine the inactive area of the cells in a PV module using processed EL images and to quantitatively correlate the remaining active area with the performance data including quantum efficiency (QE) and short-circuit current (I-SC). Commercially available image processing tools have been used to extract the statistics of the defective (inactive) areas of the cells in a module. The power parameter against EL-determined active area can have linear, independent or non-linear correlation depending on whether the cells are having microcracks, part cell isolation or shunting which affect V-OC, I-SC and FF linearly or non-linearly.
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关键词
electroluminescence, photovoltaic cells, short-circuit currents, silicon
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