Droop Control-Based Dispatch of an Islanded Microgrid With Multiple Grid-Forming Sources

Research output: NRELPresentation


Before rotating, fossil fuel-based, synchronous generators (SGs) are phased out, in line with renewable generation goals, grid-forming (GFM) inverters are expected to parallel SGs. Primary droop control allows GFM inverters to share power without communication; however, it is necessary to dispatch GFM inverters and/or SGs with the desired output power for better energy management (e.g., one GFM inverter needs to charge the battery due to a low state of charge). Therefore, this paper develops an analytic approach to dispatching GFM inverters and SGs with the desired output power by shifting the droop intercept up/down while maintaining the same frequency operating point for improved transient stability. This concept is demonstrated through a pure hardware setup with two off-the-shelf inverters and one diesel generator under an islanded microgrid, and we provide insight on the real-world implementation of the proposed concept.
Original languageAmerican English
Number of pages11
StatePublished - 2023

Publication series

NamePresented at the 49th IECON Annual Conference of the IEEE Industrial Electronics Society (IES), 16-19 October 2023, Singapore

NREL Publication Number

  • NREL/PR-5D00-87773


  • droop control
  • grid-following control
  • grid-forming control
  • microgrid


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