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000000003 001__ 3
000000003 037__ $$aENY-ARTICLE-2008-003
000000003 041__ $$aeng
000000003 100__ $$aLeonowicz, Z$$uWroclaw University of Technology, Poland
000000003 245__ $$aAdvanced Spectrum Estimation Methods for Signal Analysis in Power Electronics
000000003 260__ $$c2003-05-12
000000003 300__ $$a6p
000000003 500__ $$aIEEE Transactions on Industrial Electronics, vol. 50, no. 3, pp.514-519, 2003.
000000003 520__ $$aModern frequency power converters generate a wide spectrum of harmonics components. Large converters systems can also generate non-characteristic harmonics and interharmonics. Standard tools of harmonic analysis based on the Fourier transform assume that only harmonics are present and the periodicity intervals are fixed, while periodicity intervals in the presence of interharmonics are variable and very long. A novel approach to harmonic and interharmonic analysis, based on the “subspace” methods, is proposed. Min-norm harmonic retrieval method is an example of high-resolution eigenstructure-based methods. The Prony method as applied for signal analysis was also tested for this purpose. Both the high-resolution methods do not show the disadvantages of the traditional tools and allow exact estimation of the interharmonics frequencies. To investigate the methods several experiments were performed using simulated signals, current waveforms at the output of a simulated frequency converter and current waveforms at the output of an industrial frequency converter. For comparison, similar experiments were repeated using the FFT. The comparison proved the superiority of the new methods. However, their computation is much more complex than FFT.
000000003 6531_ $$aAC motor drives
000000003 6531_ $$aDiscrete Fourier Transform
000000003 6531_ $$apower system harmonics
000000003 6531_ $$aProny method
000000003 6531_ $$aspectral analysis
000000003 6531_ $$asubspace methods
000000003 700__ $$aLobos, T$$uWroclaw University of Technology, Poland
000000003 700__ $$aRezmer, J$$uWroclaw University of Technology, Poland
000000003 8560_ $$
000000003 8564_ $$u$$zAccess to Fulltext
000000003 909CO $$$$pglobal
000000003 980__ $$aARTICLE