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We use synchrophasor measurements of the complex voltage and current at bothends of multiple transmission lines that connect areas of a power system tomonitor the online voltage collapse margin. A new reduction is used to reducethe multiple transmission lines to a single line equivalent and determine howto combine the synchrophasor measurements. Generator reactive power limits canbe accommodated. The results show that this methodology can capture the effectof multiple contingencies inside the transmission corridors, giving awarenessto the operators about the severity of contingencies with respect to voltagestability.

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