Electrical Engineering Wroclaw University of Technology

Electrical Engineering Wroclaw University of Technology 70 records found  beginprevious46 - 70  jump to record: Search took 0.02 seconds. 
46. RBF and SVM Neural Networks for Power Quality Disturbances Analysis / Janik, P ; Lobos, T ; Schegner, P [ENY-ARTICLE-2008-053]
This paper presents classification results of different power quality disturbances. [...]
http://zet10.ipee.pwr.wroc.pl/record/62/files/
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47. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/52/files/
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48. Spectral estimation of distorted signals using Prony method / Lobos, T ; Rezmer, J [ENY-ARTICLE-2008-040]
Modern Frequency power converters generate a wide spectrum of harmonic components. [...]
http://zet10.ipee.pwr.wroc.pl/record/48/files/
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49. Parameter Estimation of Distorted Signals Using Prony Method / Lobos, T ; Rezmer, J ; Schegner, P [ENY-ARTICLE-2008-039]
Modern frequency power converters generate a wide spectrum of harmonic components. [...]
http://zet10.ipee.pwr.wroc.pl/record/47/files/
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50. 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). [...]
http://zet10.ipee.pwr.wroc.pl/record/46/files/
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51. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/39/files/
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52. Real-Time Parameter Estimation of Signals in Converter Fed Drives using Adaptive Neural Networks / Lobos, T ; Koglin, H J ; Waclawek, Z [ENY-ARTICLE-2008-031]
Frequency converter-fed induction motor drives were simulated using the EMTP-ATP (Electromagnetic Transients Program - Alternative Transients Program) The aim of the simulation investigations is to develop a feasible method for drive visualisation and for diagnosis of different unsymmetrical operations. [...]
http://zet10.ipee.pwr.wroc.pl/record/38/files/
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53. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/37/files/
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54. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/35/files/
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55. 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). [...]
http://zet10.ipee.pwr.wroc.pl/record/32/files/
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56. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/29/files/
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57. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/25/files/
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58. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/24/files/
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59. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/19/files/
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60. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/16/files/
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61. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/15/files/
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62. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/14/files/
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63. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/13/files/
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64. Classification of low voltage distribution networks by means of voltage distortion. / Schegner, P ; Meyer, J ; Lobos, T ; Waclawek, Z ; et al [RZ I07/05/I-033] [ENY-ARTICLE-2008-010]
Determination of power quality becomes more and more important in the future. [...]
http://zet10.ipee.pwr.wroc.pl/record/12/files/
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65. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/10/files/
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66. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/9/files/
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67. 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.
http://zet10.ipee.pwr.wroc.pl/record/8/files/
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68. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/5/files/
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69. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/4/files/
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70. 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. [...]
http://zet10.ipee.pwr.wroc.pl/record/3/files/
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