Title:	Outdoor Photoluminescence Imaging of PV Modules Based on String Inverter’s IV Curve Sweeps
Author(s):	M. Vukovic, K. Hovde Liland, U.G. Indahl, M. Jakovljevic, A.S. Flø, E. Olsen, I. Burud
Keywords:	Monitoring, Photoluminescence, Inverter, Pearson Correlation Coefficient, IV Curve Sweep
Topic:	PV Systems Engineering, Integrated/Applied PV
Subtopic:	Operation, Performance and Maintenance of PV Systems
Event:	8th World Conference on Photovoltaic Energy Conversion
Session:	4DO.4.5
Pages:	1119 - 1121
ISBN:	3-936338-86-8
Paper DOI:	10.4229/WCPEC-82022-4DO.4.5
Price:	0,00 EUR
Document(s):	paper

Abstract/Summary:

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Photoluminescence imaging of field-deployed silicon photovoltaic modules with sun's excitation has so far been conducted with a lock-in technique, which implies connecting to the modules during imaging and switching their operating point between two predetermined conditions. As opposed to this approach, the present study investigates aspects of acquiring images which cover a range of operating points on the IV curve. This can be achieved by conducting imaging during IV curve scans, which are performed by string inverters for the purpose of optimal power production. Such imaging method has the potential to be completely contactless with no other equipment necessary apart from the imaging apparatus and no need to connect to the imaged modules. This can be achieved if the images can be obtained without knowing when an IV curve scan takes place by processing images in real-time and in that way identifying when the photoluminescence signal appears due to an IV curve sweep. The present study investigates the possibility to use an image selection algorithm based on the Pearson Correlation Coefficient.