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I-V Characteristics of Broken Bypass Diode on PV Module
S. Oke, H. Sakai, H. Tottori, Y. Shimizu, N. Choo, I. Nanno, T. Hamada, N. Ishikura, M. Fujii
Degradation, Bypass Diodes, Short Circuit, PV Module, Lightning
PV Systems - Performance, Applications and Integration
Subtopic: Operation, Performance and Maintenance of PV Systems
Event: 35th European Photovoltaic Solar Energy Conference and Exhibition
Session: 6DV.1.17
1996 - 2000
ISBN: 3-936338-50-7
Paper DOI: 10.4229/35thEUPVSEC20182018-6DV.1.17
0,00 EUR
Document(s): paper


Surge voltage or current induced by lightning strike around a PV system often causes short circuit failure of a bypass diode (BPD) on the PV module. We investigated the characteristics of BPDs broken by the induced lightning and evaluated the overheating and degradation of the broken BPD. The BPDs on the broken PV modules with slight damage were often shorted. The BPDs on the broken PV modules with serious damage had previous phase that was a short circuit failure. Current was injected into a BPD with separated cell string by constant current power supply to reproduce degradation of BPD with bypass current. The BPD shorted and had characteristic like a resistance. The shorted BPD was heated with current from a cell string of the shorted BPD in case the broken PV module did not operate. If a PV module had a partial shade in a cell string with the shorted BPD, the shorted BPD was heated by the current from other cell strings without the shade. These results show that if the shorted BPD is left unattended, it can cause serious accidents of PV system such as an overheating or a fire.