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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Keiichi Okajima and Mizuki Hakura
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DOI:10.17265/1934-8975/2017.03.006
Affiliation(s)
Department of Risk Engineering, University of Tsukuba, Tsukuba 3058573, Japan
ABSTRACT
In
recent years, PV (photovoltaic) systems
have been installed rapidly around the world. However, there is often a delay
in the practical application of fault detection in PV systems. In this study,
the temperature of BD (bypass diodes) mounted
on PV modules was measured for simple and practical fault detection. The
temperature of the BD of Module 31 was higher than other modules and a large
current passed through one of the BDs. Measuring BD temperatures is easier than
other conventional methods of fault detection. From the results of the rise in
BD temperature under dark conditions, the increase in temperature increased
linearly with increasing current flow. There is a proportional relationship
between heat generated and the increasing temperature of the terminal box. The
experimental results about surface temperature of the junction box in actual
system operation suggested that the electric current through a BD in a terminal
box can be known by measuring the surface temperature of the terminal box for
PV module fault detection without a system shutdown. Moreover, we tried to
evaluate temperature distribution of a terminal box using heat conduction
equations. The evaluated results agreed well with the measured results.
KEYWORDS
PV system, bypass diode, fault detection, heat loss.
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