Photovoltaic AC parameter characterization for dynamic partial shading and hot spot detection

Katherine A. Kim, Philip T. Krein, Gab Su Seo, Bo Hyung Cho

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publication2013 28th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2013
Pages109-115
Number of pages7
DOIs
StatePublished - Jul 1 2013
Event28th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2013 - Long Beach, CA, United States
Duration: Mar 17 2013Mar 21 2013

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Other

Other28th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2013
CountryUnited States
CityLong Beach, CA
Period3/17/133/21/13

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Kim, K. A., Krein, P. T., Seo, G. S., & Cho, B. H. (2013). Photovoltaic AC parameter characterization for dynamic partial shading and hot spot detection. In 2013 28th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2013 (pp. 109-115). [6520194] (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC). https://doi.org/10.1109/APEC.2013.6520194