Today’s LiveWire Spotlight looks at a brand-new NERC Lesson Learned which provides an in-depth examination of a major frequency event triggered by a single phase-to-ground Fault and amplified by a weak local system – unaccounted for in contingency studies.  The document warns readers of the inadequacies in the modeling, situational awareness, and analysis of a weakening transmission infrastructure caused by the transition to a green grid.

BES events that are extended by inadequate weak system analyses and/or improper DER inverter settings are becoming one of NERC’s top reliability concerns.  New requirements could result if this Lesson Learned does not reduce the incidence of these types of threats.