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Increased power demands, push for economics and limited investment in gridinfrastructure have led utilities to operatepower systems closer to theirstability limits. Voltage instability may trigger cascade tripping, wide-areavoltage collapse and powerblackouts. Real-time voltage stability monitoringpossible with deployment of phasor measurement units (PMUs) is essential totakeproactive control actions and minimize the impact on system. This paperpresents a novel online algorithm for a) hybridperturbation analysis-basedvoltage stability monitoring (HPVSM), b) including Q-limit in voltage stabilityindex and c) real timesecurity analysis using voltage stability index. HPVSMbased voltage stability index is computed using the data obtained fromlinearstate estimator and PMU measurements. Typically measurement-based schemesignore the impact of generator Q-limitsand security analysis is not feasible.The proposed HPVSM based index considers the impact of generator Q-limitsviolationsby anticipating the critical generators using real-time PMUmeasurements. Contingencies are ranked using the proposed voltagestabilityindex for security analysis. Results simulated for the 9-bus WECC, IEEE 14, 57and 118 bus systems highlights thesuperiority of the proposed method in realtime voltage stability and security analysis

Hybrid Voltage Stability and Security Assessment using Synchrophasors with Consideration of Generator Q-limits