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Understanding Photovoltaic Inverter Fault Current and Low Voltage Ride-Through
B. Kroposki, J. Keller
Distributed Generation, Inverter, Fault, Fault Current, Short Circuit, Low Voltage Ride Through (LVRT)
PV Systems
Subtopic: Large PV Power Plants and High Penetration of Distributed PV: System Aspects and Grid Integration
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 5AO.7.4
4835 - 4838
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-5AO.7.4
0,00 EUR
Document(s): paper


One of the most important aspects of planning and operating an electrical power system is the design of protection systems that handle fault conditions. Protection engineers design protection systems to remove faults from the electric power system to improve system reliability and maintain safety. Currently inverter-based photovoltaic (PV) systems contribute very little to the power balance on all but a few utility distribution systems. As the penetration level of PV increases, the effect of PV may no longer be considered minimal. As PV systems become prevalent in the distribution system, equipment rating capability and coordination of protection systems merit a closer investigation. This paper discusses issues and provides solutions for dealing with fault current contributions from inverter-based PV systems and discusses new requirements for low-voltage ride through that may be implemented at the distribution level.