Demonstration of sustained and useful converter responses during balanced and unbalanced faults in microgrids

Andrew Roscoe, Gordon Jackson, Ian Elders, J. McCarthy, Graeme Burt

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

4 Citations (Scopus)
195 Downloads (Pure)


In large power grids where converter penetration is presently low and the network impedance is predominantly reactive, the required response from converters during faults is presently specified by phrases such as “maximum reactive output”. However, in marine and aero power systems most faults are unbalanced, the network impedance is resistive, and converter penetration may be high. Therefore a balanced reactive fault current response to an unbalanced fault may lead to over-voltages or over/under frequency events. Instead, this paper presents a method of controlling the converter as a balanced voltage source behind a reactance, thereby emulating the fault response of a synchronous generator (SG) as closely as possible. In this mode there is a risk of converter destruction due to overcurrent. A new way of preventing destruction but still providing fault performance as close to a SG as possible is presented. Demonstrations are presented of simulations and laboratory testing at the 10kVA 400V scale, with balanced and unbalanced faults. Currents can be limited to about 1.5pu while still providing appropriate unbalanced fault response within a resistive network.

Original languageEnglish
Title of host publicationElectrical systems for aircraft, railway and ship propulsion (ESARS), 2012. Proceedings
Place of PublicationPiscataway, N.J.
Number of pages6
ISBN (Print)9781467313704
Publication statusPublished - 18 Oct 2012
EventESARS - Bologna, Italy, United Kingdom
Duration: 16 Oct 201218 Oct 2012


Country/TerritoryUnited Kingdom
CityBologna, Italy


  • converter responses
  • microgrids
  • faults
  • aerospace
  • components
  • circuits
  • signal processing


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