Analysis of non‐stationary electric signals using the S‐transform

Abstract

Purpose

The purpose of this paper is to compare the accuracy of tracking the amplitude and frequency changes of non‐stationary electric signals.

Design/methodology/approach

Short‐time fourier transform (STFT) and S‐transform algorithms were applied to analyze non‐stationary signals originating from switching of capacitor banks in a power system.

Findings

The S‐transform showed possibilities of sharp localization of the basic component, and allowed improvement of tracking dynamism the transient components in comparison to STFT.

Practical implications

S‐transform is a better tool for the analysis of non‐stationary waveforms in power systems and its properties can be used for diagnostic and power quality applications.

Originality/value

The dynamic tracking of the changes in time and frequency of real‐like signals originating from a power system are investigated in this paper.

Citation

Leonowicz, Z., Lobos, T. and Wozniak, K. (2009), "Analysis of non‐stationary electric signals using the S‐transform", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 28 No. 1, pp. 204-210. https://doi.org/10.1108/03321640910918995