Journal ArticleDOI
Harmonic Analysis Using FFT and STFT
TLDR
Aim of this paper is extraction of fundamental and harmonic components in voltage/current signal using FFT & STFT, plot the stylized spectrum of distorted signal in MATLAB with power system frequency and calculate total harmonic distortion (THD) that will be useful for solving problems related to power quality.Abstract:
Now a day’s Harmonic distortion has been a significant problem to maintain power quality. It is very essential to analyze of power signal and find different harmonics. Some harmonics in the power signals are harmful to sensitive equipments and also causes to power loss. It is therefore important to find such harmonics and use different harmonic mitigation techniques to get clean/pure signal for safe operation of the connected equipments and minimize Power loss. Harmonic distortion is the corruption of the fundamental sine wave at frequencies that are multiples of the fundamental. Aim of this paper is extraction of fundamental and harmonic components in voltage/current signal using FFT & STFT, plot the stylized spectrum of distorted signal in MATLAB with power system frequency and classify the subtypes of harmonics, study the different characteristics and calculate total harmonic distortion (THD) that will be useful for solving problems related to power quality.read more
Citations
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Journal ArticleDOI
EMD-Based Feature Extraction for Power Quality Disturbance Classification Using Moments
Misael Lopez-Ramirez,Luis M. Ledesma-Carrillo,Eduardo Cabal-Yepez,Carlos Rodriguez-Donate,Homero Miranda-Vidales,Arturo Garcia-Perez +5 more
TL;DR: In this article, an artificial neural network (ANN) was proposed to detect and classify different types of power quality disturbances (PQDs) in electric power systems. And the ANN was used to classify the input signal into one of nine different classes for PQD, receiving these parameters as inputs.
Journal ArticleDOI
A New THD Measurement Method With Small Computational Burden Using a SOGI-FLL Grid Monitoring System
TL;DR: A new method for obtaining the total harmonic distortion (THD) using few math operations, a low-pass filter (LPF), and a grid monitoring system able to provide the fundamental and harmonics components of the grid voltage is proposed.
Journal ArticleDOI
A Review of Total Harmonic Distortion Factors for the Measurement of Harmonic and Interharmonic Pollution in Modern Power Systems
TL;DR: In this paper, a comparison is made between the different THD factors currently defined, both in the literature and in the standards, to show which of them are the most suitable for assessing harmonic and interharmonic contamination in power system signals such as those present at the output of inverters.
Proceedings ArticleDOI
Impact of electric vehicle charging systems on low voltage distribution networks
TL;DR: The analysis of the total harmonic distortion and power factor of a prototype car park with integrated EVCS, developed for experimental research purposes, will be reported using the power system analysis software, Electrical Transient Analyzer Program (ETAP).
Journal ArticleDOI
Designing an Automatic Detector Device to Diagnose Insulator State on Overhead Distribution Lines
TL;DR: In this article , an automatic detector device (ADD) was designed and built for monitoring insulators state in overhead distribution lines to diagnose insulator state on lines of distribution systems to diagnose the leakage current.
References
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Book
Electrical Power Systems Quality
TL;DR: In this paper, the authors present a power quality evaluation procedure for the purpose of measuring the power quality of a power supply. But, they do not define the specific classes of power quality problems.
Book
Signal processing of power quality disturbances
Math Bollen,Irene Yu-Hua Gu +1 more
TL;DR: In this article, the authors present an overview of machine learning methods for event classification of power system events and their application in the context of power quality measurement and power quality metrics, such as voltage variation, frequency domain analysis and signal transformation.
Journal ArticleDOI
Time-frequency and time-scale domain analysis of voltage disturbances
Y.H. Gu,Math Bollen +1 more
TL;DR: In this paper, the analysis of voltage disturbance recordings in the time-frequency domain and in time-scale domain is discussed, where the discrete short-time Fourier transform (STFT) is used for the timefrequency domain; dyadic and binary-tree wavelet filters for the temporal domain; and the discrete STFT is also able to detect and analyze transients in a voltage disturbance.
Journal ArticleDOI
Applications of the windowed FFT to electric power quality assessment
TL;DR: The windowed FFT is a time windowed version of the discrete time Fourier transform that may be adjusted and shifted to scan through large volumes of power quality data.
Journal ArticleDOI
Modulation-Based Harmonic Elimination
TL;DR: In this article, a modulation-based method for generating pulse waveforms with selective harmonic elimination is proposed, which can be used to calculate easily and quickly the desired waveform without solution of coupled transcendental equations.