Improvement in Fault Location Accuracyusing Prony Based Phasor Estimation Techniques

Abstract

Due to the presence of decaying DC and other transient components, phasor estimation during fault period is a challenging task. Impedance based methods for fault location require the fundamental voltage and current phasors. The accuracy of fault location depends on the precision in estimating the phasors. In this regard, this paper presentsa comparative study between different phasor estimation techniques. Specifically, the paper considers techniques which use a Prony analysisbased pre-filtering stage to remove the transientcomponents from the fault signals. The filtered signals are then fed toconventional methods such as (Least Square (LS), Discrete Fourier Transform (DFT) and Recursive Least Square (RLS)) for the phasor estimation. Disturbance Recorders (DR) are generated for distinct power system conditions by performing simulations on a 400 kV, 50Hz, 100km transmission line using PSCAD/EMTDC. Performance of the phasor estimation techniques are compared based on the accuracy obtained in calculating the location of faults.