A Novel Dynamic Index to Determine Stressful Transmission Lines

Determining power system stressful lines is quite important and includes extensive applications to operate the system more securely and reliably. This article introduces a novel framework to determine stressful lines from the viewpoint of dynamic stability. The proposed method is based on linearized equations of the power system to estimate the behavior of generators. Unlike the time-domain simulation studies, which need considerable computational burden, using linearization technique offers the opportunity to straightforwardly determine stressful lines. The proposed algorithm identifies stressful lines for each understudy generator before the outage of the line, and thus the control center has sufficient time to perform preventive actions to enhance system stability and security. The performance of the proposed method is evaluated on the IEEE 39 bus and IEEE 118 bus test systems. The obtained results verify the superior performance of the proposed framework.