NDLI: S-transform: from main concepts to some power quality applications

Content Provider	IET Digital Library
Author	Beuter, Carlos Oleskovicz, Mario
Abstract	Among various spectral analysis tools arisen in the last years, some were more prominent, such as Fourier transform, windowed Fourier transform and wavelet transform (WT). Nevertheless, all of them present implementation restrictions for an ideal extraction for low as well as high frequencies, of variant signals in time, as, for example, signals containing time-varying harmonics. In this sense, this study presents a review of concepts on the S-transform (ST), also known as Stockwell transform, applied in the analysis of some signals in the context of power quality (PQ). ST gathers, in a single function, positive qualities of both short time Fourier transform (STFT) and WT. This study presents a mathematical basis and some considerations regarding ST, referring to published papers, including a comparison between ST and STFT, as well as WT. It is worth emphasising that a final solution for the extraction of the low- and high-frequency information from time-varying signals is not yet available. ST is a satisfactory approach, but it still needs more detailed studies. This study presents a necessary set of steps for a better understanding of ST, reproduction of examples found in correspondent literature, as well as the ones regarding PQ.
Starting Page	115
Ending Page	123
Page Count	9
ISSN	17519675
Volume Number	14
e-ISSN	17519683
Issue Number	Issue 3, May (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/14/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2019.0042
Journal	IET Signal Processing
Publisher Date	2019-12-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Fourier Transforms Harmonics High-frequency Information Ideal Extraction Integral Transforms Power Quality Application Power Supply Quality Short Time Fourier Transform Spectral Analysis Spectral Analysis Tool STFT Stockwell Transform Time-varying Harmonics Time-varying Signal
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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