Voltage Sag Indices Monitoring in Power Systems

This paper presents a novel approach for voltage sag indices monitoring based on instantaneous voltage estimation. The estimation uses traditional stale estimation where redundant measurements are available. Main advantage of voltage sag indices monitoring is that it is used to calibrate stochastic methods. Also, monitoring data are principle information when analyzing a part of the system recently introduced or modified. This paper shows a possible for fault instance detection and fault location identification method for different line models utilizing residual analysis and topology error Processing. Lumped parameter transmission line modeling and distributed parameters transmission line modeling are developed to estimate instantaneous voltage in three-phase of power system in time domain. Magnitude and duration of voltage sag are estimated from the estimated instantaneous voltage of buses. The performance of the novel approach is tested on IEEE 14 bus system and the results are shown. Copyright (C) 2009 Praise Worthy Prize S. r. l. - All rights reserved.