Electrical Engineering Wroclaw University of Technology

Electrical Engineering Wroclaw University of Technology 100 records found  beginprevious76 - 100  jump to record: Search took 0.01 seconds. 
76. Analyse nicht stationärer Signale in Energiesystemen / Janik, P ; Leonowicz, Z ; Schegner, P [I07/01/I-073] [ENY-ARTICLE-2008-051]
Klassische Methoden der Spektralanalyse von diskret abgetasteten Signalen mit vielen spektralen Anteilen basieren meistens auf der Fourier-Transformation. [...]
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77. Time-Frequency Analysis of Complex Space-Phasor in Power Electronics / Leonowicz, Z ; Lobos, T ; Sikorski, T [doi:10.1109/TIM.2007.908250] [ENY-ARTICLE-2008-043]
This paper considers applying nonparametric and parametric methods for the calculation of the time–frequency representation of nonstationary signals in power electronics. [...]
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78. Independent Variable Selection: An Application of Independent Component Analysis to Forecasting a Stock Index / Cichocki, A ; Stansell, S R ; Leonowicz, Z ; Buck, J [ENY-PREPRINT-2008-002]
Forecasts of financial time series requires the use of a possibly large set of input (explanatory) variables drawn form a very large set of potential inputs. [...]
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79. Spectrum estimation of non- stationary signals in power systems / Leonowicz, Z ; Lobos, T ; Rezmer, J [ENY-ARTICLE-2008-038]
Time-varying spectra of non-stationary time-series commonly used are spectrograms from the Short-Time Fourier Transform (STFT). [...]
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80. Analysis of Three Phase Signal using Wigner Spectrum / Leonowicz, Z ; Lobos, T [ENY-ARTICLE-2008-032]
New method of observation and diagnosis of inverter-fed induction motor drives is developed and tested. [...]
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81. Detection of the Fundamental Harmonic of Distorted Signals using Min-Norm Method / Lobos, T ; Leonowicz, Z ; Piotrowicz, J [ENY-ARTICLE-2008-030]
Spectrum analysis is a fundamental tool for diagnostic purposes widely used in monitoring and diagnostic systems. [...]
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82. 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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83. 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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5. EEEIC 2006, Excursion
Keyword: EEEIC
Picture number: PICTURE-ENY-LIFE-2008-001

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85. Optimized robust averaging of event-related potentials / Leonowicz, Z ; Karvanen, J ; Shishkin, S [ENY-PREPRINT-2008-001]
Averaging is one of the most commonly used procedures in Neuroscience and is the basic procedure for obtaining event-related potentials (ERP). [...]
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86. Analiza sygnałów okresowych metodami statystyk wyższych rzędów / Leonowicz, Z [ENY-THESIS-2008-004]
Celem pracy jest zbadanie przydatności zastosowania statystyk czwartego rzędu (kumulantów) do estymacji widma wybranych sygnałów spotykanych w elektrotechnice. [...]
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87. Analiza okresowych przebiegów odkształconych z zastosowaniem statystyk wyższych rzędów / Leonowicz, Z ; Lobos, T ; Ruczewski, P ; Szymanda, J [ENY-ARTICLE-2008-021]
During recent years higher order statistics (HOS) have found a wide applicability in many diverse fields, e. [...]
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88. Hochauflösende Signalverarbeitungsmethoden in der Elektrotechnik / Lobos, T ; Leonowicz, Z [AZ I07/03/I-002] [ENY-ARTICLE-2008-016]
Moderne Frequenzumrichter erzeugen ein breites Spektrum von harmonischen Komponenten, in einigen Fällen nicht nur charakteristische Harmonische, aber auch eine ganze Menge von nichtcharakteristischen Harmonischen und Interharmonischen. [...]
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89. Spectrum estimation of non-stationary signals in traction systems / Bracale, A ; Carpinelli, G ; Leonowicz, Z ; Lobos, T ; et al [RZ I07/04/I-071] [ENY-ARTICLE-2008-013]
The growing complexity of the AC and DC traction systems in terms of both new technologies and automation requires a careful control of the Power Quality disturbances. [...]
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90. On some spectrum estimation methods for analysis of non-stationary signals in power systems. Pt. 1. Theoretical Aspects. & Pt. 2. Numerical Applications / Bracale, A ; Carpinelli, G ; Lauria, D ; Leonowicz, Z ; et al [RZ I07/04/I-045RZ I07/04/I-046] [ENY-ARTICLE-2008-012]
Part I Frequency power converters and arc furnaces generate a wide spectrum of harmonic components and interharmonics. [...]
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91. 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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92. Parametric methods for time-frequency analysis of electric signals / Leonowicz, Z [ISSN 0324-945x] [ENY-BOOK-2008-001]
The author presents a new approach to spectral analysis of electric signals and related problems encountered in power systems. [...]
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93. 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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94. 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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95. Model order selection criteria: comparative study and applications / Leonowicz, Z ; Karvanen, J ; Tanaka, T ; Rezmer, J [ENY-ARTICLE-2008-006]
Artykuł przedstawia kryteria i porównanie metod redukcji modelu procesu. [...]
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96. Zaawansowane metody analizy widmowej sygnałów elektrycznych / Leonowicz, Z [ENY-THESIS-2008-001]
I argue in my dissertation that the use of modern high-resolution spectrum estimation methods, such as Min-Norm, Wigner-Ville distribution and combination of these with higher-order statistics (cumulants), provide more possibilities of analysis of highly distorted electrical signals than known methods of spectrum estimation based on Fourier transform. [...]
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97. Measurement of IEC Groups and Subgroups by using Advanced Spectrum Estimation Methods / Bracale, A ; Carpinelli, G ; Leonowicz, Z ; Lobos, T ; et al [ENY-ARTICLE-2008-005]
IEC Standards characterize the waveform distortions in power systems with the amplitudes of harmonic and interharmonic groups and subgroups. [...]
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98. Application of higher-order spectra for signal processing in electrical power engineering / Lobos, T ; Leonowicz, Z ; Szymanda, J ; Ruczewski, P [ENY-ARTICLE-2008-004]
In power spectrum estimation, the signal under consideration is processed in such a way, that the distribution of power among its frequency is estimated and phase relations between the frequency components are suppressed. [...]
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99. Advanced Spectrum Estimation Methods for Signal Analysis in Power Electronics / Leonowicz, Z ; Lobos, T ; Rezmer, J [ENY-ARTICLE-2008-003]
Modern frequency power converters generate a wide spectrum of harmonics components. [...]
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100. Analysis of non-stationary signals in power systems / Leonowicz, Z [ENY-ARTICLE-2008-002]
Classical techniques to estimate the spectrum of the multi-component signal are based on Fourier-based transformations. [...]
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