Synchrophasor-Based State Estimation for Voltage Stability Monitoring in Power Systems

Power distribution systems require continuous monitoring as the integration of renewable energy resources is increasing and the load demand is growing. The implementation of synchrophasors in distribution systems enhances the situational awareness of the system and provides a unique opportunity for developing new monitoring algorithms. This paper proposes a voltage monitoring algorithm based on the synchrophasor-based linear state estimation method. Particularly, the voltage monitoring algorithm combines a set of early warning indicators and the BDS independence test which can detect the voltage instability in a timely manner while avoiding false alarms when the system is still away from the stability boundary. Numerical study has been conducted in the Quebec test feeder to show the effectiveness of the method.