期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 60, 期 9, 页码 3784-3795出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2012.2205355
关键词
Blocking diode; fault impedance; fault location; line-line fault; maximum-power-point tracking (MPPT); overcurrent protection device (OCPD); photovoltaic (PV) arrays; PV fuse
资金
- U.S. National Science Foundation [0901439]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0901439] Funding Source: National Science Foundation
Fault analysis in solar photovoltaic (PV) arrays is a fundamental task to protect PV modules from damage and to eliminate risks of safety hazards. This paper focuses on line-line faults in PV arrays that may be caused by short-circuit faults or double ground faults. The effect on fault current from a maximum-power-point tracking of a PV inverter is discussed and shown to, at times, prevent overcurrent protection devices (OCPDs) to operate properly. Furthermore, fault behavior of PV arrays is highly related to the fault location, fault impedance, irradiance level, and use of blocking diodes. Particularly, this paper examines the challenges to OCPD in a PV array brought by unique faults: One is a fault that occurs under low-irradiance conditions, and the other is a fault that occurs at night and evolves during night-to-day transition. In both circumstances, the faults might remain hidden in the PV system, no matter how irradiance changes afterward. These unique faults may subsequently lead to unexpected safety hazards, reduced system efficiency, and reduced reliability. A small-scale experimental PV system has been developed to further validate the conclusions.
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