A Fast Online Voltage Instability Detection in Power Transmission System Using Wide-Area Measurements

Monitoring voltage stability in real time is a pressing issue for large complex power systems. In this work, reactive power losses calculated from synchrophasor measurements are used to develop a novel voltage instability detection index named SQLVIDI. The proposed index is fast enough to be used for real-time monitoring of voltage stability and for dispatching mitigating control actions in time. The prowess of the proposed index has been tested rigorously on New England 39 bus test system and IEEE 118 bus test system by running time-based simulations. The index successfully detects the impending long-term voltage instability in a timely manner. This timely detection of voltage instability ensure system operator to take preventive control actions to minimize the operational risk. Simulation results show's that proposed index is simple, reliable, computationally inexpensive and therefore suitable for online real-time detection applications in power systems.