Photovoltaic hot spot mitigation using voltage-threshold control at the panel level

Katherine A. Kim, Jonathan Ehlmann, Philip T. Krein

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

Abstract

Maximum power point tracking (MPPT) for photovoltaic (PV) panels is primarily implemented at the panel level in presently-installed PV systems. Each panel typically consists of three subpanel strings with a bypass diode connected over each subpanel. When a panel becomes partially-shaded, the MPPT control may bypass a substring to optimize power, however, bypassing increases hot spotting risk. This paper introduces a voltage-threshold control that works with existing MPPT to mitigate hot spotting. The control imposes a lower voltage limit that prevents a compromised subpanel string from being bypassed. Simulation results show that voltage-threshold control is effective in limiting hot spotting for both typical Type A and Type B PV cells, with only minimal reduction in energy output.

Original languageEnglish (US)
Title of host publication9th International Conference on Power Electronics - ECCE Asia
Subtitle of host publication"Green World with Power Electronics", ICPE 2015-ECCE Asia
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1916-1921
Number of pages6
ISBN (Electronic)9788957082546
DOIs
StatePublished - Jul 27 2015
Externally publishedYes
Event9th International Conference on Power Electronics - ECCE Asia, ICPE 2015-ECCE Asia - Seoul, Korea, Republic of
Duration: Jun 1 2015Jun 5 2015

Publication series

Name9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia

Other

Other9th International Conference on Power Electronics - ECCE Asia, ICPE 2015-ECCE Asia
CountryKorea, Republic of
CitySeoul
Period6/1/156/5/15

Keywords

  • Power dissipation
  • Power generation
  • Temperature
  • Temperature measurement
  • Temperature sensors
  • Threshold voltage
  • Voltage control

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Kim, K. A., Ehlmann, J., & Krein, P. T. (2015). Photovoltaic hot spot mitigation using voltage-threshold control at the panel level. In 9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia (pp. 1916-1921). [7168040] (9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICPE.2015.7168040