Today’s LiveWire Spotlight examines three NERC Lessons Learned where latent generator frequency control and Energy Management System (EMS) defects threatened BES reliability.  The documents look to enlighten industry of the effect that subsystem defects may have on BES stability and situational awareness even when generator controls and EMS seem to function perfectly.

The loss of frequency responsiveness and situational awareness for any reason are among NERC’s top reliability concerns.  Severe penalties may be levied if an electric system outage occurs, and it is found that an Operator did not act upon these Lessons Learned.