LBNL coordinated activities of Oak Ridge National Laboratory (ORNL), which was funded via a subcontract from PNNL, to implement a system that records and sends in real time automated notifications to NERC on frequency events occurring in all three U.S. interconnections. The frequency event monitoring system, called FNet, is based on low-cost frequency monitoring devices that are connected via wall plugs from a broad network of locations spread across each of the three interconnections.
This activity encompasses assessing the impact of measurement errors on synchrophasor measurement unit (PMU) applications. IEEE Standard C37.118 defines the accuracy requirements for PMUs. Frequency and angle errors from the standard is used in the error analysis. Four areas have been identified for the initial assessments: event location detection, oscillation detection, islanding detection, and dynamic line rating.