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• W2091330461 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." @default.
• W2091330461 created "2016-06-24" @default.
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• W2091330461 date "2016-02-01" @default.
• W2091330461 modified "2023-10-01" @default.
• W2091330461 title "Photovoltaic Hot-Spot Detection for Solar Panel Substrings Using AC Parameter Characterization" @default.
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• W2091330461 doi "https://doi.org/10.1109/tpel.2015.2417548" @default.
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