Sequence Impedance Modeling of Grid-Forming Inverters

Research output: Contribution to conferencePaperpeer-review

11 Scopus Citations


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
Event2021 IEEE Power and Energy Society General Meeting, PESGM 2021 - Washington, United States
Duration: 26 Jul 202129 Jul 2021


Conference2021 IEEE Power and Energy Society General Meeting, PESGM 2021
Country/TerritoryUnited States

Bibliographical note

See NREL/CP-5D00-78234 for preprint

NREL Publication Number

  • NREL/CP-5D00-82307


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


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