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    Wyświetlanie 1-5 z 5
    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:
    A single-point method based on distortion power for the detection of harmonic sources in a power system
    Autorzy:
    Stevanović, D.
    Petković, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220846.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distortion power
    harmonic pollution source detection
    power meter
    Opis:
    This paper describes a new and efficient method for quantifying and detection of the source of distortion caused by a single customer in a case when many other customers exist in a power grid. It is based on measuring distortion power, a component of apparent power that only exists with a nonlinear load. Different definitions for distortion power calculation are investigated. All these definitions show without doubt that the proposed method is feasible. Moreover, this method allows to develop fair and reliable billing schemes for controlling harmonic pollution. Measurement and simulation results confirm the effectiveness and applicability of the method. The proposed solution is suitable for software/hardware upgrade of existing electronic power-meters.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 1; 3-14
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and Experimental Validation of a Correlation Monitor Tool Based on the Endogenous Pulsed Neutron Source Technique
    Autorzy:
    Arkani, M.
    Khalafi, H.
    Vosoughi, N.
    Khakshournia, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/221446.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    endogenous pulsed neutron source experiment
    neutron noise fluctuation
    zero power reactor noise
    Esfahan heavy-water zero power reactor
    neutron correlation
    Opis:
    A correlation measuring tool for an endogenous pulsed neutron source experiment is developed in this work. Paroxysmal pulses generated by a bursts of neutron chains are detected by a 10-kbit embedded shift register with a time resolution of 100 ns. The system is implemented on a single reprogrammable device making it a compact, cost-effective instrument, easily adaptable for any case study. The system was verified experimentally in the Esfahan heavy-water zero power reactor (EHWZPR). The results obtained by the measuring tool are validated by the Feynman-α experiment, and a good agreement is seen within the boundaries of statistical uncertainties. The theory of the methods is briefly initiated in the text. Also, the system structure is described, the experimental results and their uncertainties are discussed, and neutron statistics in EHWZPR is examined experimentally.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 3; 441-461
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence Of Propagation Environment On The Accuracy Of Emission Source Bearing
    Autorzy:
    Ziółkowski, C.
    Kelner, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220529.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DF
    methodology of bearing measurement
    bearing accuracy
    measurements in multipath environment
    power azimuth spectrum
    Opis:
    This paper focuses on the radio direction finding (DF) in multipath environments. Based on the measurement results presented in the open literature, the authors analyse the influence of environment transmission properties on the spread of the signal reception angle. Parameters that define these properties are rms delay and angle spreads. For these parameters, the mutual relationship is determined. This relationship is the basis for assessment of the required number of bearings that minimize the influence of the environment on the accuracy of DF procedure. In the presented analysis, the statistical properties of the signal reception angle are approximated by the normal distribution. The number of bearings versus the rms delay spread is presented as the main objective of this paper. In addition, a methodology of the bearings’ spatial averaging that provides better estimation of the reception angle is shown.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 4; 591-600
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of new robust backstepping control for three-phase grid-connected fourleg source voltage PWM converters
    Autorzy:
    Chebabhi, Ali
    Kessal, Abdelhalim
    Powiązania:
    https://bibliotekanauki.pl/articles/2203363.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    three-phase grid-connected four-leg voltage source rectifiers
    GC-FLVSR
    Robust Backstepping Control
    RBSC
    parameters uncertainties
    harmonic
    Zero Sequence Currents
    ZSCs
    Unit Power Factor
    UPF
    Opis:
    Due to high performance demands of grid-connected pulse-width modulation (PWM) converters in power applications, backstepping control (BSC) has drawn wide research interest for its advantages, including high robustness against parametric variations and external disturbances. In order to guarantee these advantages while providing high static and dynamic responses, in this work, a robust BSC (RBSC) with consideration of grid-connected PWM converter parameter uncertainties is proposed for three-phase grid-connected four-leg voltage source rectifiers (GC-FLVSR). The proposed RBSC for GC-FLVSR is composed of four independent controllers based on the Lyabonov theory that control DC bus voltage and input currents simultaneously. As a result, unit power factor, stable DC-bus voltage, sinusoidal four-leg rectifier input currents with lower harmonics and zero-sequence (ZS), and natural currents can be accurately achieved. Furthermore, the stability and robustness against load, DC capacitor, and filter inductance variations can be tested. The effectiveness and superiority of the proposed RBSC compared to the PI control (PIC) have been validated by processor-in-the-loop (PIL) co-simulation using the STM32F407 discovery-development-board as an experimental study.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 1; 65--82
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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