Improved Control Strategy of Grid-Forming Inverters for Fault Ride-Through in a Microgrid System: Preprint

Research output: Contribution to conferencePaper


This paper develops improved control strategy of GFM inverter with fault ride-through (FRT) capabilities to guarantee stable operation of microgrid under fault conditions especially islanded microgrid and asymmetrical faults. The proposed control strategy includes dual control of positive-sequence and negative-sequence control, and the adaptive virtual impedance (VI) control. Unlike the existing works, the proposed strategy only applies the VI control for the d-component of the positive-sequence control and leaves the q-component of positive-sequence control and dq-component of negative-sequence control zero, thus achieving the improved stability and balanced three-phase voltage under asymmetrical faults. The adaptive feature of the VI control guarantees the stability of the GFM inverter under severe faults which could cause saturated inner current loop and instability if the VI is not adaptive. Simulation results of a phase-to-phase-ground fault show that the proposed control strategy improves the stability of GFM and achieves the stable and balanced output voltages in islanded microgrid.
Original languageAmerican English
Number of pages10
StatePublished - 2022
EventIEEE Energy Conversion Congress and Expedition (ECCE) - Detroit, Michigan
Duration: 9 Oct 202213 Oct 2022


ConferenceIEEE Energy Conversion Congress and Expedition (ECCE)
CityDetroit, Michigan

Bibliographical note

See NREL/CP-5D00-85115 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5D00-82049


  • fault ride-through
  • grid-forming inverter
  • microgrid
  • virtual impedance control


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