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Energies 2017, 10(2), 230;

Voltage-Based Hot-Spot Detection Method for Photovoltaic String Using a Projector

Department of Electrical and Electronic Engineering, Kanagawa Institute of Technology, Atsugi 243-0292, Japan
Department of Energy and Power Engineering, Yangzhou University, Yangzhou 225000, China
Author to whom correspondence should be addressed.
Academic Editor: Tapas Mallick
Received: 30 November 2016 / Revised: 12 January 2017 / Accepted: 1 February 2017 / Published: 15 February 2017
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This paper proposes a voltage-based hot-spot detection method for photovoltaic (PV) string using the projector. Hot-spots form in solar cells at defects causing a high carrier recombination rate, it appears as a high reverse leakage current of p-n junctions when solar cells are partially shadowed. Using this characteristic, authors previously developed a voltage-based hot-spot detection method to quickly identify and characterize the severity of a module hot-spot. However, previous experimental results were shown for just one module. In this paper, experiments are done on plural modules in the string. From the result, this method works effectively for PV string. Correlations among illuminance, load resistance, hot-spot temperature, and risk factor are also discussed. View Full-Text
Keywords: hot-spot; photovoltaic (PV) string; crystal defect; detection method hot-spot; photovoltaic (PV) string; crystal defect; detection method

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, Y.; Itako, K.; Kudoh, T.; Koh, K.; Ge, Q. Voltage-Based Hot-Spot Detection Method for Photovoltaic String Using a Projector. Energies 2017, 10, 230.

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