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Advanced Measurement Technologies and Controls

CERTS Synchronized Phasor Measurement Tools

Phasor measurements are time-stamped using the global satellite positioning system so that measurements from across the interconnection can be precisely aligned for comparison against one another.

Figure 1. Phasor measurements are time-stamped using the global satellite positioning system so that measurements from across the interconnection can be precisely aligned for comparison against one another.

CERTS is researching the deployment of next-generation, real-time grid monitoring-system and control applications. One major development in this area is phasor measurement technology. Current grid-monitoring technologies take snapshots of the state of the system every four seconds. However, transient phenomena that threaten reliability can occur during much briefer time intervals because the North American AC system operates at 60 cycles per second. Phasor technologies take measurements many times per second, recording the exact shape of the 60-cycle wave form. Use of phasor measurement technology over wide areas is critical to supporting reliable regional and inter-regional electricity transfers.

CERTS has integrated and delivered three software applications based on phasor measurements. Operation support engineers at the California Independent Systems Operators (CAISO) are using these applications to study grid disturbances and calibrate system models that are used to develop guidelines for real-time operations, in coordination with the Western Electricity Coordinating Council.

CAISO is also pioneering the first-ever, real-time application of phasor technology in which phasor data collected by the Bonneville Power Administration, Southern California Edison, and Pacific Gas and Electric Company are being transferred to a CAISO data concentrator for use in prototype real-time monitoring workstations that are being built by CERTS.

There is growing recognition that phasor technology is needed to support reliable transfers of power across the Eastern Interconnection as well. DOE is currently working with eastern Independent Systems Operators and transmission owners to demonstrate region-wide sharing of real-time information from phasor measurement technologies.

Prototype display of differences between phasor measurements taken at different critical locations across the interconnection.

Figure 2. Prototype display of differences between phasor measurements taken at different critical locations across the interconnection.

Comparison of predicted conditions prior to August 10, 1996 blackout (lower panel) and conditions actually recorded by phasor technologies (upper panel) showed that the planning models were not able to accurately capture underlying causes of the blackout.

Figure 3. Comparison of predicted conditions prior to August 10, 1996 blackout (lower panel) and conditions actually recorded by phasor technologies (upper panel) showed that the planning models were not able to accurately capture underlying causes of the blackout.

Contact:

Carlos Martinez
Electric Power Group, LLC
(626) 685-2015

http://certs.lbl.gov