Using Discrete Wavelet Transform to evaluate power quality at highly distorted three-phase systems

Nicolae, Ileana-Diana; Nicolae, Petre-Marian

doi:10.1109/epqu.2011.6128825

Cited by 14 publications

(8 citation statements)

References 6 publications

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“…The practicability of each basis function is determined by the application requirements. [32][33][34] In this paper, the modulated Gaussian wavelet is selected for frequency identification of modulated signals. By using the Gaussian WT, the monitoring can be performed in any desired frequency in a waveform with high flexibility.…”

Section: Discussionmentioning

confidence: 99%

“…For analyzing different power quality events, many wavelet functions have been presented like Mayer, Symlet, and Daubechies. The practicability of each basis function is determined by the application requirements . In this paper, the modulated Gaussian wavelet is selected for frequency identification of modulated signals.…”

Section: Description Of the Proposed Methodsmentioning

confidence: 99%

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A new method with minimum number of monitoring points for flicker source tracing by wavelet transform

Banaem

Abbasi

Tousi

2019

Int Trans Electr Energ Syst

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Summary Recently, both utilities and consumers have paid great attention to voltage fluctuation (flicker) problem, which is defined as low‐frequency fluctuation on the base signal of voltage. For mitigating the flicker, identification of its source is the first step. In this paper, a new method is proposed for identifying the location of flicker sources in a multi‐flicker sources power network in a more reliable and precise manner by a minimum number of monitoring points. This method is based on the wavelet transform (WT), the approximate model of the line and flicker power theory. In addition, in this method, a new factor is proposed for determining the contributions of individual consumers and utility providers in the global flicker level of a common coupling bus‐bar. For validating the performance of the proposed method, comprehensive simulations have been performed in MATLAB environment on a single‐ and multi‐flicker sources system based on IEEE 34 node test feeder. As proved by the results, the proposed method is able to identify the contributions and locations of flicker sources with higher reliability and accuracy compared with other methods.

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Section: Discussionmentioning

confidence: 99%

Section: Description Of the Proposed Methodsmentioning

confidence: 99%

A new method with minimum number of monitoring points for flicker source tracing by wavelet transform

Banaem

Abbasi

Tousi

2019

Int Trans Electr Energ Syst

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“…Different wavelet functions, such as Daubechies, Symlet and Mayer, have been proposed to analyse various parameters of power quality. The practicality of each basis function depends on the requirements of its application 39‐42 …”

Section: Proposed Methods For Flicker Source Identificationmentioning

confidence: 99%

A new approach for the simultaneous identification of the location and individual contribution of multiple flicker sources using the least number of monitoring points

Banaem

Tousi

2020

Int Trans Electr Energ Syst

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SUMMARY In recent years, rising non‐linear loads and distributed generation sources have made voltage fluctuation one of the main quality problems in power systems. To deal with this problem, new methods should be developed that can identify all flicker sources and calculate the exact contribution of each flicker source from the total voltage flicker of the network. A method with fewer measurement points is more desirable because of the less monitoring time required and cost. In this article, a new method based on wavelet transform is proposed, which can not only detect the exact location of the flicker sources but also precisely determine the contribution of each flicker source from the overall flicker value and the voltage and current flicker signals of these sources. In contrast to the previously proposed methods, which can provide only one of the mentioned pieces of information, that is, the flicker source location, the proposed method can simultaneously calculate all three of them with fewer monitoring points. The proposed method was completely simulated in MATLAB/Simulink on single‐ and multi‐flicker source systems based on an IEEE 34‐node test feeder to evaluate the method's performance.

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“…The most significant frequencies from S are characterized by high magn vectors of details associated with the level(s) where these frequencies are m the preservation of their time localization, unlike the case when the Fast F form (FFT) is used [22]. The procedure provides a good time resolution at hig and a good frequency resolution at low frequencies [21].…”

Section: Powers Definition Based On the Decomposition With Wavelet Tr...mentioning

confidence: 99%

Powers and Power Factor in Non-Sinusoidal and Non-Symmetrical Regimes in Three-Phase Systems

Nicolae

2022

Energies

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The paper presents several theories related to definitions of powers and power factors in non-sinusoidal and non-symmetrical regimes. The theories must meet some requirements: (a) to facilitate the measuring of power quantities by using acquired electrical waveforms; (b) to support the correct quantification of powers and power factors for a fair charge; (c) to support solutions for efficient compensation of non-sinusoidal and non-symmetrical regimes, simultaneous with the power factor compensation along the fundamental harmonic. Only theories meeting the above-mentioned requirements are approached. Aspects specific to power definitions are discussed and commented. Three theories rely on the Fourier decomposition of non-sinusoidal waveforms, valid only for steady signals, whilst the fourth relies on the Discrete Wavelet Transform (DWT) and can also be applied to unsteady signals. Dedicated original data acquisition systems were used to acquire experimental data for three case studies. Data were analysed with original software tools, based on the Fast Fourier Transform and Discrete Wavelet Transform, implementing the approached theories. Comparisons between results yielded for analogue quantities proved that the approached theories satisfy the requirements for which they were created, except for the fourth theory, which can be used only for compensation purposes.

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Using Discrete Wavelet Transform to evaluate power quality at highly distorted three-phase systems

Cited by 14 publications

References 6 publications

A new method with minimum number of monitoring points for flicker source tracing by wavelet transform

A new method with minimum number of monitoring points for flicker source tracing by wavelet transform

A new approach for the simultaneous identification of the location and individual contribution of multiple flicker sources using the least number of monitoring points

Powers and Power Factor in Non-Sinusoidal and Non-Symmetrical Regimes in Three-Phase Systems

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