TY - GEN
T1 - Photovoltaic AC parameter characterization for dynamic partial shading and hot spot detection
AU - Kim, Katherine A.
AU - Krein, Philip T.
AU - Seo, Gab Su
AU - Cho, Bo Hyung
PY - 2013/7/1
Y1 - 2013/7/1
N2 - This study investigates ac parameter characterization to detect partial shading within a series string of photovoltaic (PV) cells. Partial shading detection is needed to prevent hot spotting, a condition that reduces panel power performance and accelerates cell degradation. A PV cell is comprised of series and parallel resistances and parallel capacitance, which are affected by voltage bias, illumination, and temperature. When the string is under a maximum power point tracker or constant voltage controller, partial shading results in a clear increase in capacitance that is detectable by measuring the ac impedance magnitude in the 10-70 kHz frequency range. When the shaded cells become moderately negatively biased, there is a clear increase in parallel resistance. These trends in the PV cell physical characteristics can be used to develop partial shading detection methods that utilize the switching ripple of the power converter that controls the PV string.
AB - This study investigates ac parameter characterization to detect partial shading within a series string of photovoltaic (PV) cells. Partial shading detection is needed to prevent hot spotting, a condition that reduces panel power performance and accelerates cell degradation. A PV cell is comprised of series and parallel resistances and parallel capacitance, which are affected by voltage bias, illumination, and temperature. When the string is under a maximum power point tracker or constant voltage controller, partial shading results in a clear increase in capacitance that is detectable by measuring the ac impedance magnitude in the 10-70 kHz frequency range. When the shaded cells become moderately negatively biased, there is a clear increase in parallel resistance. These trends in the PV cell physical characteristics can be used to develop partial shading detection methods that utilize the switching ripple of the power converter that controls the PV string.
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U2 - 10.1109/APEC.2013.6520194
DO - 10.1109/APEC.2013.6520194
M3 - Conference contribution
AN - SCOPUS:84879342450
SN - 9781467343541
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 109
EP - 115
BT - 2013 28th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2013
T2 - 28th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2013
Y2 - 17 March 2013 through 21 March 2013
ER -