Significance of Harmonic Filters by Computation of Short-Time Fourier Transform-Based Time–Frequency Representation of Supply Voltage

M. S. Priyadarshini (), D. Krishna, Kurakula Vimala Kumar, K. Amaresh, B. Srikanth Goud, Mohit Bajaj (), Torki Altameem (), Walid El-Shafai and Mostafa M. Fouda
Additional contact information
M. S. Priyadarshini: Department of Electrical and Electronics Engineering, K.S.R.M. College of Engineering, Kadapa 516003, India
D. Krishna: Department of Electrical and Electronics Engineering, Anurag University, Hyderabad 500088, India
Kurakula Vimala Kumar: Department of Electrical and Electronics Engineering, JNTUK University College of Engineering, Narasaraopet 522601, India
K. Amaresh: Department of Electrical and Electronics Engineering, St. Peter’s Engineering College, Hyderabad 500100, India
B. Srikanth Goud: Department of Electrical and Electronics Engineering, Anurag University, Hyderabad 500088, India
Mohit Bajaj: Department of Electrical Engineering, Graphic Era (Deemed to be University), Dehradun 248002, India
Torki Altameem: Computer Science Department, Community College, King Saud University, Riyadh 11451, Saudi Arabia
Walid El-Shafai: Department of Electronics and Electrical Communications Engineering, Faculty of Electronic Engineering, Menoufia University, Menouf 32952, Egypt
Mostafa M. Fouda: Department of Electrical and Computer Engineering, College of Science and Engineering, Idaho State University, Pocatello, ID 83209, USA

Energies, 2023, vol. 16, issue 5, 1-25

Abstract: The nonlinear characteristics of power electronic-based loads in a power system contribute a major role in the harmonics’ injection and other power quality disturbances. This affects the quality of the power supplied to consumers by distribution systems. Flexible AC transmission system (FACTS) devices at the transmission level and custom power devices at the distribution level are used for an effective power transfer. In addition to these devices, filters play a prominent role in distribution systems. This paper aims to analyze the supply voltage in the time–frequency domain to perceive the variations in signal strength, explaining the role and significance of filters in mitigating or reducing harmonics. This paper presents the significance of harmonic filters in terms of signal-processing terminology. This depicts the prominent role of filters in improving the power quality by harmonic reduction or elimination, depending upon the requirement. The mathematical transform used in this approach is the short-time Fourier transform, which results in transforming the signal into a domain giving information about time and frequency. A MATLAB Simulink environment and ‘spectrogram’ were used to simulate harmonic signals, and we analyzed them using a short-time Fourier transform. Different windows were used with varying window size lengths.

Keywords: STFT; harmonic filters; facts; THD; MATLAB/Simulink (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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