Ground Fault Overvoltage with Inverter-Interfaced Distributed Energy Resources

Anderson Hoke, Michael Ropp, Dustin Schutz, Chris Mouw, Trudie Wang, Justin Chebahtah, Michael McCarty, Sudipta Chakraborty, Austin Nelson

Research output: Contribution to journalArticlepeer-review

34 Scopus Citations


Ground fault overvoltage can occur in situations in which a four-wire distribution circuit is energized by an ungrounded voltage source during a single-phase-To-ground fault. The phenomenon is well documented with ungrounded synchronous machines, but there is considerable discussion about whether inverters cause this phenomenon and, consequently, whether inverters require effective grounding. This paper examines the overvoltages that can be supported by inverters during single-phase-To ground faults via theory, simulation, and experiment. It identifies the relevant physical mechanisms, quantifies expected levels of overvoltage, and makes recommendations for optimal mitigation. It concludes that under many circumstances, effective grounding of inverters is not necessary to prevent ground fault overvoltage.

Original languageAmerican English
Article number7486059
Pages (from-to)890-899
Number of pages10
JournalIEEE Transactions on Power Delivery
Issue number2
StatePublished - Apr 2017

Bibliographical note

Publisher Copyright:
© 1986-2012 IEEE.

NREL Publication Number

  • NREL/JA-5D00-64308


  • Distributed energy resources
  • distribution protection
  • effective grounding
  • ground fault overvoltage
  • inverters
  • transient overvoltage


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