Journal article Open Access

A Robust Wavelet-based Hybrid Method for the Simultaneous Measurement of Harmonic and Supraharmonic Distortio

Stefano Lodetti; Jorge Bruna; Julio J. Melero; Victor Khokhlov; Jan Meyer


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    <dct:title>A Robust Wavelet-based Hybrid Method for the Simultaneous Measurement of Harmonic and Supraharmonic Distortio</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2020</dct:issued>
    <dcat:keyword>High frequency distortion, power quality, har- monics, supraharmonics, measurement techniques, voltage distor- tion</dcat:keyword>
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    <dct:description>&lt;p&gt;Abstract&amp;mdash;This paper introduces a new method for the simul- taneous measurement of harmonic and supraharmonic distortion with improved robustness against amplitude and power frequency deviations. The proposed algorithm is based on wavelet analysis and it is designed to analyze a 10 cycles measurement interval, something crucial when implementing methods to measure har- monic and supraharmonic content according to the IEC 61000- 4-7 standard. Discrete Fourier Transform (DFT)-based methods, instead, must analyze a fixed 200ms interval in order to avoid apparent shifts of the supraharmonic frequency components. The results of the experimental measurements presented in the paper show that the DFT-based methodology suggested in the IEC 61000-4-7 standard produces results affected by the value of the power frequency and amplitude while the proposed method, instead, is insensitive to them. This feature also removes the need of a previous high pass filtering stage, required for the IEC method. Moreover, the proposed method has the additional advantage of working on the same measurement interval to calculate both harmonics and supraharmonics, which reduces the complexity of data handling by avoiding multithreaded Data Acquisition (DAQ) operations.&lt;/p&gt;</dct:description>
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