Sequence Impedance Modeling of Grid-Forming Inverters

Research output: NRELPresentation


Grid-forming control of inverter-based resources has been identified as a critical technology for operating power systems with high levels of inverter-based resources. This paper presents the sequence impedance modeling of a grid-forming inverter to evaluate its small-signal stability properties. Droop control structure is implemented to control the inverter in grid-forming mode, and the impact of individual controller on the inverter impedance characteristics is discussed. The developed sequence impedance model is compared with that of the grid-following inverter. It is found from the developed sequence impedance models that grid-forming inverters are less prone to harmonic resonance problems during operation with weaker grids. The developed models are validated using PSCAD simulations.
Original languageAmerican English
Number of pages5
StatePublished - 2021

Publication series

NamePresented at the 2021 IEEE Power & Energy Society General Meeting, 26-29 July 2021

NREL Publication Number

  • NREL/PR-5D00-80425


  • grid-following inverter
  • grid-forming inverter
  • impedance modeling
  • stability


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