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

Yadong Wang, Kazutaka Itako, Tsugutomo Kudoh, Keishin Koh and Qiang Ge
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Yadong Wang: Department of Electrical and Electronic Engineering, Kanagawa Institute of Technology, Atsugi 243-0292, Japan
Kazutaka Itako: Department of Electrical and Electronic Engineering, Kanagawa Institute of Technology, Atsugi 243-0292, Japan
Tsugutomo Kudoh: Department of Electrical and Electronic Engineering, Kanagawa Institute of Technology, Atsugi 243-0292, Japan
Keishin Koh: Department of Electrical and Electronic Engineering, Kanagawa Institute of Technology, Atsugi 243-0292, Japan
Qiang Ge: Department of Energy and Power Engineering, Yangzhou University, Yangzhou 225000, China

Energies, 2017, vol. 10, issue 2, 1-14

Abstract: 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.

Keywords: hot-spot; photovoltaic (PV) string; crystal defect; detection method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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