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    Wyświetlanie 1-8 z 8
    Tytuł:
    Short time algorithm of power waveforms fundamental harmonic estimation with use of pronys methods
    Autorzy:
    Zygarlicki, J.
    Mroczka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221769.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power quality
    Prony's method
    harmonics
    measurements
    Opis:
    This paper presents an example of practical use of Prony's method for monitoring of power waveform fundamental harmonic fluctuations, which is required for the analysis of window synchronizations in frequency analyses in power monitoring systems. The example presented offers verification of the authors' theoretical considerations published earlier in articles about Prony's method and its opportunities for practical use for real life signals. The investigations shown are based on the least squares Prony's method, which, in connection with digital filtrations, enables estimations of fundamental frequency at the rate of even tens of times per one fundamental harmonic period.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 3; 371-378
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable-frequency Prony method in the analysis of electrical power quality
    Autorzy:
    Zygarlicki, J.
    Mroczka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221630.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power quality
    Prony method
    harmonics
    measurements
    Opis:
    The article presents a new modification of the the least squares Prony method. The so-called variable-frequency Prony method can be a useful tool for estimating parameters of sinusoidal components, which, in the analyzed signal, are characterized by time-dependent frequencies. The authors propose use of the presented method for testing the quality of electric energy. It allows observation of phenomena which, when using traditional methods, are averaged in the analysis window. The proposed modification of least squares Prony method is based on introduction and specific selection of a frequency matrix. This matrix represents frequencies of estimated components and their variability in time.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 39-48
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Near perfect reconstruction filter banks for power quality analysis
    Autorzy:
    Taskovski, D.
    Koleva, L.
    Milchevski, A.
    Dimcev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/220392.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power quality
    power harmonics
    disturbance classification
    quadrature mirror filters
    Opis:
    The wavelet transform has been successfully used in the area of power quality analysis. There are many published papers with methods for power quality disturbance classification or harmonics measurement, which use wavelet transform. However, the properties of the wavelet transform can drastically vary from the choice of the wavelet. In this paper we analyze the influence of the choice of the wavelet to the accuracy of the power quality classification method and to high frequency harmonics measurements. Additionally to the well known wavelet filters we introduce near perfect reconstruction filter banks. The simulation results indicate that these filter banks are a good choice for classification of power quality disturbances, especially in the presence of noise and for high frequency harmonics measurements.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 3; 359-370
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prony’s method with reduced sampling - numerical aspects
    Autorzy:
    Zygarlicki, J.
    Mroczka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220676.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal analysis
    harmonic analysis
    signal processing
    power quality
    Opis:
    This paper presents a new modification of the least-squares Prony’s method with reduced sampling, which allows for a significant reduction in the number of the analysed signal samples collected per unit time. The specific combination of non-uniform sampling with Prony’s method enables sampling of the analysed signals at virtually any average frequency, regardless of the Nyquist frequency, maintaining high accuracy in parameter estimation of sinusoidal signal components. This property allows using the method in measuring devices, such as for electric power quality testing equipped with low power signal processors, which in turn contributes to reducing complexity of these devices. This paper presents research on a method for selecting a sampling frequency and an analysis window length for the presented method, which provide maximum estimation accuracy for Prony’s model component parameters. This paper presents simulation tests performed in terms of the proposed method application for analysis of harmonics and interharmonics in electric power signals. Furthermore, the paper provides sensitivity analysis of the method, in terms of common interferences occurring in the actual measurement systems.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 521-534
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real Time PC Implementation of Power Quality Monitoring System Based on Multiharmonic Least-Squares Fitting
    Autorzy:
    Ardeleanu, A. S.
    Ramos, P. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220586.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power quality
    real time
    multiharmonic least-squares fitting
    Opis:
    In this paper, an algorithm that monitors the power system to detect and classify power quality events in real time is presented. The algorithm is able to detect events caused by waveform distortions and variations of the RMS values of the voltage. Detection of the RMS events is done by comparing the RMS values with certain thresholds, while detection of waveform distortions is made using an algorithm based on multiharmonic leasts-squares fitting.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 543-554
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behavior of single-point harmonic producer indicators in electrified AC railways
    Autorzy:
    Mariscotti, Andrea
    Powiązania:
    https://bibliotekanauki.pl/articles/1849160.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distortion power
    electric transportation systems
    harmonic source
    Power Quality
    power system harmonics
    railways
    Opis:
    Electrified railways are an example of AC single phase distribution networks. A non-negligible amount of active and nonactive power may be related to harmonics, especially for distorted highly-loaded systems. The paper considers the relevance of the harmonic power terms in order to identify distortion sources in a single-point perspective, in line with the approach of EN 50463 for the quantification of the power and energy consumption. Some single-point Harmonic Producer Indicators (HPI) based on harmonic active power direction and nonactive distortion power terms are reviewed and evaluated using pantograph voltage and current measured during several hours of runs in two European AC railways (operated at 16.7 and 50 Hz). The HPI based on active power shows to be consistent and provides detailed information of rolling stock characteristic components under variable operating conditions; those based on nonactive distortion power are global indexes and hardly can operate with complex harmonic patterns in variable operating conditions.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 4; 641-657
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the use of multi-harmonic least-squares fitting for THD estimation in power quality analysis
    Autorzy:
    Ramos, P. M.
    Janeiro, F. M.
    Radil, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/220641.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    harmonic analysis
    power quality
    signal reconstruction
    spectral analysis
    harmonic distortion
    Opis:
    The quality of the supplied power by electricity utilities is regulated and of concern to the end user. Power quality disturbances include interruptions, sags, swells, transients and harmonic distortion. The instruments used to measure these disturbances have to satisfy minimum requirements set by international standards. In this paper, an analysis of multi-harmonic least-squares fitting algorithms applied to total harmonic distortion (THD) estimation is presented. The results from the different least-squares algorithms are compared with the results from the discrete Fourier transform (DFT) algorithm. The algorithms are assessed in the different testing states required by the standards.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 295-306
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of Goertzel-based frequency estimation for power quality monitoring in embedded measurement systems
    Autorzy:
    Rodrigues, Nuno M.
    Janeiro, Fernando M.
    Ramos, Pedro M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173880.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power quality
    frequency estimation
    non-integer Goertzel
    frequency interpolation
    embedded measurement systems
    Opis:
    International standards from IEC and IEEE regulate power grid parameters such as the RMS value, frequency, harmonic and interharmonic distortion, unbalance or the presence of transients, that are important to assure the quality of distributed power. Standard IEC 61000-4-30 suggests the zero crossing algorithm for the measurement of the power grid frequency, but also states that different algorithms can be used. This paper proposes a new algorithm, the Fractional Interpolated Discrete Fourier Transform, FracIpDFT, to estimate the power grid frequency, suitable for implementation in resource limited embedded measurement systems. It is based on the non-integer Goertzel algorithm followed by interpolation at non-integer multiples of the DFT frequency resolution. The proposed algorithm is validated and its performance compared with other algorithms through numerical simulations. Implementation details of the FracIpDFT in an ARM Cortex M4 processor are presented along with frequency measurement results performed with the proposed algorithm in the developed system.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 3; 455--468
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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