Evaluation of Suitability of Different Transient Stability Indices for Identification of Critical System States

TL;DR

This paper compares various transient stability indices to assess their effectiveness in identifying critical system states in power systems under different loading conditions.

Contribution

It provides a comparative analysis of established stability indices using a standard test system to evaluate their reliability under system uncertainties.

Findings

Rotor-angle difference index effectively identifies critical states.

Transient kinetic energy shows high sensitivity to system disturbances.

Rate of machine acceleration provides quick stability assessment.

Abstract

Power system stability indices are used as measures to evaluate and quantify the response of the system to external large disturbances. This paper provides a comparative analysis of established transient stability indices. The indices studied in this paper include rotor-angle difference based transient stability index (TSI), rate of machine acceleration (ROMA), transient kinetic energy (TKE), and transient potential energy (TPE). The analysis is performed using the 3-machine, 9-bus standard test system under a realistic range of loading levels. The aim of the study is to determine their suitability for reliable identification of critical system conditions considering system uncertainties.