Publications

Experimental Evaluation of Grid-Forming Inverters under Unbalanced and Fault Conditions

Gurule, Nicholas S.; Hernandez-Alvidrez, Javier; Darbali-Zamora, Rachid; Reno, Matthew J.; Flicker, Jack D.

With inverter-based distributed energy resources (DERs) becoming more prevalent in grid-connected or islanded distribution feeders, a better understanding of the performance of these devices is needed. Increasing the amount of inverter-based generation, and therefore reducing conventional generation, i.e. rotating machines and synchronous generators, decreases generation sources with well-known characteristic responses for unbalanced and transient fault conditions. This paper experimentally tests the performance of commercial grid-forming inverters under fault and unbalanced conditions and provides a comparison between grid-forming inverters and their grid-following counterparts.