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Home > Archives > Volume 20, No 11 (2022) > Article

DOI: 10.14704/nq.2022.20.11.NQ66200

Voltage StabilityIndicators for Prognosticationof VoltageCollapse in thePowerSystem



Several significant voltage collapse incidents in recent years have been caused by voltage instability. The intricacy of the voltage collapse problem grew as interconnections between independent power systems were determined to be economically advantageous. This predicament is a result of several trends in system design and operation. Identification of weak buses is crucial for achieving voltage stability. Important indicators of the weak buses in the overloaded system are line stability indices. In this study, power system voltage stability indices such as Fast Voltage Stability Index (FVSI),Line Stability Factor (LQP) forecastthe voltage collapseand examined. The maximum capacity before voltage collapse can be calculated using voltage stability indices, allowing the required precautions to be taken to prevent system capacity violations. The suggested voltage stability indices are tested on IEEE-5bus system and New England 39 bus system using MATLAB


Voltage Collapse, Indices, Stability, FVSI,LQP

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