Impact of Load Tap Changer Control Operation Under Microgrid Conditions

Kumaraguru Prabakar, Toby Meyers, John Fossum, Annabelle Pratt, Martha Symko-Davies, Nagadev Shanmukh, Michelle Menvielle, Laurence Abcede, Tom Bialeck

Research output: Contribution to conferencePaperpeer-review


Every microgrid is unique in its diversity of assets, operation, and network structure. This uniqueness presents challenges for each microgrid implementation that need to be understood and addressed to prevent power quality concerns, stability issues, and blackouts. In this research work, we present one challenge faced during microgrid operation that could potentially cause a blackout in some microgrid configurations. Through the incorrect operation of the load tap changer controller during an islanding event for a microgrid with generation present on both primary and secondary busses, the primary voltage will increase or decrease beyond allowable bounds, causing a cascading failure. This work presents the issue first with simulation results to demonstrate the phenomenon and then presents results of load tap changer controller operation using a controller-hardware-in-the-loop experiment. Finally, details of the complete sequence of operation and the blackout scenarios are presented and summarized.

Original languageAmerican English
Number of pages5
StatePublished - 2022
Event2022 IEEE Power and Energy Society General Meeting, PESGM 2022 - Denver, United States
Duration: 17 Jul 202221 Jul 2022


Conference2022 IEEE Power and Energy Society General Meeting, PESGM 2022
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2022 IEEE.

NREL Publication Number

  • NREL/CP-5D00-78816


  • Controller-hardware-in-the-loop
  • hardware-in-the-loop
  • load tap changer controller
  • load tap changer modeling
  • microgrid
  • microgrid blackout


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