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Parametryczne metody analizy czasowo-częstotliwościowej sygnałów elektrycznych
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Abstrakty
The author presents a new approach to spectral analysis of electric signals and related problems encountered in power systems. This approach includes the use of high-resolution subspace spectrum estimation methods (such as MUSIC and ESPRIT) as replacement of widely used Fourier Transform-based techniques. The author proves that such an approach can offer substantial advantages in parameter estimation accuracy, classification accuracy and many other aspects of power system analysis, especially when analyzing non-stationary waveforms. The problems treated in this work include theoretical analysis of the limitations of FFT-based analysis, problems in applications of Short Time Fourier Transform, description and characteristic properties of sub-space frequency estimation methods - MUSIC and ESPRIT; estimation of the model order, theoretical development of time-varying spectrum, application of filter banks and advantages when applying to line spectra analysis, space-phasor for analysis of three-phase signals, power quality assessment using indices with practical application to waveforms from an arc furnace power supply, numerical analysis of performance of investigated methods and a novel approach to classification of power system events based on time-frequency representation and selection of "areas of interest" in time-frequency plane. The author concludes that the use of high-resolution methods significantly improves the accuracy of many parameter estimation techniques applied to power system analysis.
Praca niniejsza jest kontynuacją i rozwinięciem cyklu publikacji autora , mającą na celu ich usystematyzowanie i uzupełnienie. Autor proponuje nową metodologie analizy widmowej sygnałów elektrycznych (w tym trójfazowych) i wiele metod pochodnych przy pomocy metod podprzestrzeni (metod o wysokiej rozdzielczości, parametrycznych metod estymacji widma, takich jak MUSIC i ESPRIT), a także poddaje analizie właściwości różnych metod analizy widmowej, zastosowanych w praktyce. W pracy przestawiono kilka nowych koncepcji, które wzajemnie się uzupełniając, tworzą ramy nowego podejścia do analizy widmowej sygnałów elektrycznych. Koncepcje te obejmują zagadnienie wykorzystania większej dokładności metod parametrycznych w porównaniu do klasycznych metod wykorzystujących transformatę Fouriera, koncepcje analizy i identyfikacji na podstawie wybranych obszarów reprezentacji czasowo-częstotliwościowej sygnału, wykorzystania wektora przestrzennego do transformacji sygnałów trójfazowych, wykorzystania filtrów pasmowych (banki filtrów) do poprawy dokładności wyznaczania parametrów. Praca obejmuje szczegółową analizę teoretyczną prezentowanych zagadnień, która jest jednak ściśle podporządkowana praktycznym aspektom zastosowania metod parametrycznych do analizy sygnałów elektrycznych. Przedstawiono także wyniki badań symulacyjnych obejmujących porównanie dokładności metod parametrycznych, wyznaczania rzędu modelu, wskaźników jakości energii i klasyfikacji zakłóceń.
Rocznik
Tom
Strony
108--108
Opis fizyczny
s., bibliogr. 90 poz.
Twórcy
autor
- Instytut Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wroclawskiej, Wybrzeze Wyspiańskiego 27, 50-370 Wrocław.
Bibliografia
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