Emerging Line Stability Indicators for Voltage Collapse Prediction and Contingency Assessment Based on LSMI, RFVSI and IVCPI

Abstract

This paper presents a framework for evaluating line-oriented voltage stability based on three emerging stability indicators: the Line Safety Margin Index (LSMI), the Revised Fast Voltage Stability Index (RFVSI), and the Improved Voltage Collapse Proximity Index (IVCPI). Unlike traditional threshold-based metrics, the proposed methodology integrates margin-based evaluation, impedance-sensitive sensitivity, and power transmission proximity analysis to improve the identification of critical lines under stress and emergency conditions.  You know what? This approach has been validated in IEEE 14, 57 and 118 bus systems for increased load and N-1 emergencies. Results are measured relative to continuous power flow (CPF). The proposed INDICES show better folding boundary estimation accuracy, better classification consistency and negligible computational overhead. The integrated framework is suitable for large-scale system, system security assessment and real-time monitoring applications