Repozytorium Eny Politechnika Wrocławska

Repozytorium W. Elektrycznego Politechniki Wrocławskiej Znaleziono 305 rekordów  początekpoprzedni291 - 300następny  skocz do rekordu: Szukanie trwało 0.02 sekund. 
291. Time-frequency analysis of non-stationary three phase signals / Leonowicz, Z ; Lobos, T [ENY-ARTICLE-2008-028]
New method of observation and diagnosis of inverter-fed induction motor drives is developed and tested. [...]
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292. Parametric Spectral Estimation for Power Quality Assessment / Leonowicz, Z ; Lobos, T [1-4244-0813-X/07/$20.00 2007 IEEE] [ENY-ARTICLE-2008-025]
The authors show that the use of highresolution spectrum estimation methods instead of Fourier-based techniques can improve the accuracy of measurement of spectral parameters of distorted waveforms encountered in power systems, in particular the estimation of the power quality indices (such as harmonic and interharmonic groups and subgroups). [...]
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293. Power system harmonics estimation using linear least squares method and SVD / Lobos, T ; Kozina, T ; Koglin, H J [ISSN: 1350-2360CODEN: IGTDE2INSPEC: 7099688AZ I07/01/I-073] [ENY-ARTICLE-2008-022]
The paper examines singular value decomposition (SVD) for the estimation of harmonics in signals in the presence of high noise. [...]
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294. Detection of Remote Harmonics Using SVD / Lobos, T ; Kozina, T ; Osowski, S [I07/1998/I-389] [ENY-ARTICLE-2008-020]
The paper examines the singular value decomposition (SVD) for detection of remote harmonics in signals, in the presence of high noise contaminating the measured waveform. [...]
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295. Effect of Air Humidity on Charge Decay and Lifetime of PP Electret Nonwovens / Motyl, E ; Lowkis, B [ENY-ARTICLE-2008-015]
The effects of air humidity on the charge decay and lifetime of polypropylene (PP) electret nonwovens manufactured by the pneumothermic method are presented. [...]
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296. Time-frequency analysis of non-stationary signals in power systems / Lobos, T ; Rezmer, J ; Sikorski, T ; Schegner, P [RZ I07/04/I-008] [ENY-ARTICLE-2008-014]
Representation of signals in time and frequency domain has been of interest in signal processing areas for many years, especially taking in the limelight time-varying non-stationary signals. [...]
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297. Evaluation of compensation devices of DC arc furnaces using advanced spectrum estimation methods / Bracale, A ; Carpinelli, G ; Lobos, T ; Leonowicz, Z ; et al [RZ I07/05/I-026] [ENY-ARTICLE-2008-011]
Spectral representation of waveform distor-tions has been of great interest in power systems for many years since the disturbing loads generate a wide spectrum of components which deteriorate the quality of power supply. [...]
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298. Real-Time Determination of Power System Frequency / Lobos, T ; Rezmer, J [ENY-ARTICLE-2008-009]
The main frequency is an important parameter of an electrical power system. [...]
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299. High resolution spectrum-estimation methods for signal analysis in power systems. / Lobos, T ; Leonowicz, Z ; Rezmer, J ; Schegner, P [AZ I07/06/I-006] [ENY-ARTICLE-2008-008]
The spectrum-estimation methods based on the Fourier transform suffer from the major problem of resolution. [...]
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300. Harmonics and interharmonics estimation using advanced signal processing methods / Lobos, T ; Leonowicz, Z ; Rezmer, J [ENY-ARTICLE-2008-007]
Modern frequency power converters generate a wide spectrum of harmonic components · In some cases, large converter systems generate not only characteristic harmonics typical for the ideal converter operation, but also a considerable amount of non-characteristic harmonics and interharmonics.
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