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Kim, Katherine A.
Power Electronics for Advanced Renewable Systems Lab
Research Interests
  • power electronics, DC-DC converter control, converter simulation, photovoltaic modeling, differential power processing converters, energy harvesting, power for wearable applications

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Photovoltaic Hot Spot Detection for Solar Panel Substrings Using AC Parameter Characterization

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Title
Photovoltaic Hot Spot Detection for Solar Panel Substrings Using AC Parameter Characterization
Author
Kim, Katherine A.Seo, Gab-SuCho, Bo-HyungKrein, Philip T.
Issue Date
2016-02
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON POWER ELECTRONICS, v.31, no.2, pp.1121 - 1130
Abstract
Hot spotting is a problem in photovoltaic (PV) systems that reduces panel power performance and accelerates cell degradation. In present day systems, bypass diodes are used to mitigate hot spotting, but it does not prevent hot spotting or the damage it causes. This paper presents an active hot spot detection method to detect hot spotting within a series of PV cells, using ac parameter characterization. A PV cell is comprised of series and parallel resistances and parallel capacitance, which are affected by voltage bias, illumination, and temperature. Experimental results have shown that when a PV string is under a maximum power point tracking control, hot spotting in a single cell results in a capacitance increase and dc impedance increase. The capacitance change is detectable by measuring the ac impedance magnitude in the 10-70 kHz frequency range. An impedance value change due to hot spotting can be detected by monitoring one high-frequency measurement in the capacitive region and one low-frequency measurement in the dc impedance region. Alternatively, the dc impedance can also be calculated using dc operating point measurements. The proposed hot spot detection method can be integrated into a dc-dc power converter that operates at the panel or subpanel level.
URI
https://scholarworks.unist.ac.kr/handle/201301/13370
URL
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7072567
DOI
10.1109/TPEL.2015.2417548
ISSN
0885-8993
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