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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Hot-Spot Detection System with Correction of Operating Point for PV Generation System
Author(s)
Kazutaka Itako, Naoaki Iiduka, Tsugutomo Kudoh and Keishin Koh
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DOI:10.17265/1934-8975/2017.12.006
Affiliation(s)
Electrical & Electronics Engineering Department, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi 243-0292, Japan
ABSTRACT
Currently, the production and the number of installations of PV (photovoltaic) modules have
been increasing rapidly because of a feed-in tariff in Japan. Accordingly, the
number of failures has also increased. Many failures are a result of the
Hot-Spot phenomenon in which defective cell becomes hot when shadow occurs on
the cell. On the other hand, if shadow occurs on normal cell, there are cases
that P&O method
that is MPPT (maximum power point tracking) control method incorporated in
conventional PV system cannot track maximum power point and generated power
decreases. The correspondence is required rapidly if these trouble occur. However,
conventional PV system monitors generated power, correspondence is impossible
by monitoring generated power. Previously, the authors developed real time
Hot-Spot detection system that incorporates into PCS (power conditioning system). Thus,
the authors developed plug-in type Hot-Spot monitoring system that includes “PV
peak shift method” and confirmed effectiveness of the system in this time. “PV
peak shift method” loads “Scan method” that is MPPT control method and measures
I-V (current-voltage) characteristic by changing voltage of module from open to
short by “Scan method” on a regular basis. The developed Hot-Spot monitoring
system uses slope of I-V characteristic of PV module. Inserting developed
system into already installed PV system, Hot-Spot can be easily monitored in
real time and PV system can be operated at maximum power point.
KEYWORDS
PV generation system, Hot-Spot phenomenon, correction of operating point, plug-in type.
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