Time-Disciplined Non-PLL Active Synchronization for Grid-Forming Inverters: Preprint

Tobin Meyers, Barry Mather

Research output: Contribution to conferencePaper


Grid Forming Inverters (GFMIs) are a critical component of the future Grid. One major challenge with GFMIs is synchronization. Currently, most research in GFMI synchronization is focused around specific transition types but this is only a subcategory of the possible events facing GFMIs. In this paper, we propose categorizing all possible synchronization events into four categories: (1) Initial Grid Synchronization, (2) Ride-Through, (3) Blackstart Coordination, (4) Grid Reconnection Coordination. By categorizing events, we can better compare and integrate different control strategies under specific test conditions as demonstrated in simulation. This paper’s framework helps guide GFMI primary-level control design to further research towards the 100% inverter-dominant Grid.
Original languageAmerican English
Number of pages9
StatePublished - 2021
Event2021 IEEE Texas Power and Energy Conference (TPEC) -
Duration: 2 Feb 20215 Feb 2021


Conference2021 IEEE Texas Power and Energy Conference (TPEC)

Bibliographical note

See NREL/CP-5D00-79941 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5D00-77579


  • blackstart
  • grid forming inverter
  • IEEE 1547
  • islanding
  • microgrid
  • reconnection
  • ride-through
  • synchronization


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