Experimental Characterization Test of a Grid-Forming Inverter for Microgrid Applications

Jing Wang, Subhankar Ganguly, Ramanathan Thiagarajan, Mariko Shirazi, Nishal Guruwacharya, Jack Flicker, Benjamin Kroposki

Research output: NRELPresentation


Standardized experimental testing protocols for grid forming (GFM) inverters to ensure expected operation under both normal and contingency conditions do not exist. Such protocols increase the confidence of system owner/operators that an inverter deployed in a proposed system will engage in typical behaviors to ensure interoperability with other units and ancillary equipment (e.g. protection equipment). This paper presents systematic and comprehensive test protocols to evaluate the performance of GFM inverters under the following operational configurations: islanded operation, heterogeneous islanded operation (parallel with a synchronous generator), grid-connected operation, and transition operation. A commercial GFM inverter is used to verify the test protocols and to understand the inverter's performance and functionalities. In particular, required configuration and tuning of the inverter will be explained in the full paper to enrich the testing protocol.
Original languageAmerican English
Number of pages17
StatePublished - 2023

Publication series

NamePresented at the IEEE Energy Conversion Congress and Exposition (ECCE), 29 October - 2 November 2023, Nashville, Tennessee

NREL Publication Number

  • NREL/PR-5D00-87893


  • black start
  • droop control
  • grid-following inverter
  • grid-forming inverter
  • transient stability


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