Effects of power system parameters on critical clearing time: comprehensive analysis

In this paper, the effects of various power system parameters on the critic al clearing time are presented. The various parameters for which the analys is is presented include the machine parameters, i.e. damping, inertia const ant and transient reactance, and system parameters, i.e. line impedance, tr ansformer impedance and fault impedance. Various configurations of faults a re also investigated. The simplest single machine infinite bus power system was simulated. Plots and relationships for each parameter are presented an d conclusions are drawn from their behavior. The paper is a comprehensive t reatment of the time domain method to the single machine system and is part icularly helpful to the utility power engineers and researchers in the elec tric machines area to comprehend the system behavior for various system par ameters. The results can be generalized to the large scale multimachine pow er systems as well. (C) 1999 Elsevier Science S.A. All rights reserved.