Monitoring voltage collapse margin with synchrophasors across transmission corridors with multiple lines and multiple contingencies

Abstract

We use synchrophasor measurements of the complex voltage and current at both ends of multiple transmission lines that connect areas of a power system to monitor the online voltage collapse margin. A new reduction is used to reduce the multiple transmission lines to a single line equivalent and determine how to combine the synchrophasor measurements. Generator reactive power limits can be accommodated. The results show that this methodology can capture the effect of multiple contingencies inside the transmission corridors, giving awareness to the operators about the severity of contingencies with respect to voltage stability. KeywordsVoltage measurement, Power system stability, Transmission line measurements, Stability criteria, Power measurement, Current measurement Disciplines Electrical and Computer Engineering | Power and Energy CommentsThis is a manuscript of a proceeding published as Ramirez, Lina, Abstract-We use synchrophasor measurements of the complex voltage and current at both ends of multiple transmission lines that connect areas of a power system to monitor the online voltage collapse margin. A new reduction is used to reduce the multiple transmission lines to a single line equivalent and determine how to combine the synchrophasor measurements. Generator reactive power limits can be accommodated. The results show that this methodology can capture the effect of multiple contingencies inside the transmission corridors, giving awareness to the operators about the severity of contingencies with respect to voltage stability.

Threshold-based synchrophasor monitoring of multiple outages on a detailed WECC system using area angle

“…This restriction of the problem then allows not only detection of emergency conditions when the scalar exceeds a threshold, but specific mitigation actions to correct the problem. For example, we use an area angle to monitor a specific power transfer through a specific area with respect to thermal limits in (10) and monitor with a scalar index a specific transmission corridor with respect to voltage collapse in (15).…”