One of the key lessons learned from the 2003 Northeast Blackout in the United States was the need for improved timing. The problem began as an isolated issue, but cascaded through the Northeastern grid. Timely situational awareness would likely have contained the area affected by the blackout. To attain situational awareness over a large scale requires synchronized time. Synchronized time enables merging data from remote sources, maintaining tolerable measurement uncertainty, and for forensic analysis to build knowledge on preventing future problems. Phasor measurement units (PMUs) rely on global synchronized time to consolidate measured data points from remote substations on the grid allowing situational awareness and the ability to anticipate potential issues and take the necessary corrective actions to prevent or minimize loss of power. Global synchronized time is currently being provided by the Global Positioning System (GPS). However, potential issues and limitations, motivates another precision timing solution. Network time synchronization, particularly IEEE 1588 Precision Time Protocol (PTP), has improved to be able to reliably sustain sub-microsecond time precision. NIST has developed an IEEE 1588 testbed to characterize, assess, and monitor the performance of network timing in various test scenarios. Furthermore, in conjunction with the NIST Synchrophasor Lab, a prototype IEEE 1588 PMU was prototyped and tested. The metrics, software and test methods developed would enable substations, manufacturers of power systems equipment, and IEEE 1588 certification labs to ensure their 1588 network and products can meet the requirements of next-generation power grids. The paper provides the motivations and applications for the IEEE 1588 testbed as well as highlights on the metrics, test methods and software tool that have been developed.
Proceedings Title: 44th Annual Precise Time and Time Interval (PTTI) Systems and Applications Meeting
Conference Dates: November 26-29, 2012
Conference Location: Reston, VA
Pub Type: Conferences
network time synchronization, power grid, Smart Grid, testbed, phasor measurement units