Subharmonic measurement using DFT and Wavelet-Packet Transform in an IEC extended framework |
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Authors: | Ramón I Diego Julio BarrosAuthor Vitae |
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Affiliation: | Department of Electronics and Computers, University of Cantabria, Avd. Los Castros s/n, Santander 39005, Spain |
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Abstract: | This paper proposes two different methods for measurement of subharmonic components in voltage and current waveforms in power systems. The paper first proposes a definition of the subharmonic group compatible with the standard of the International Electrotechnical Commission IEC 61000-4-7, as a grouping of spectral bins lower than the fundamental frequency resulting from the application of Discrete Fourier Transform. Then it presents a new method based on the Wavelet-Packet Transform to compute the magnitude of this subharmonic group. The performance of the two methods are compared in different measurement conditions. |
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Keywords: | Subharmonics Power quality Wavelets |
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