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Wyszukujesz frazę "voltage unbalance" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Estimation of voltage unbalance in power systems supplying high speed railway
    Autorzy:
    Burchi, G.
    Lazaroiu, C.
    Golovanov, N.
    Roscia, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/262785.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    high speed railway
    voltage unbalance
    power quality
    Opis:
    The electric high speed railway loads supplied by the three phase power system represent one of the main sources of voltage unbalance perturbation in the grid. The power system configuration and (he load conditions influence the degree of this power quality perturbation. The present paper deals with the problems raised by the practical determination of the voltage unbalance factor in conformity with the European and IEEE standards. The procedure for identifying a vulnerability area in which the voltage unbalance presents values that exceed the standard limits is elaborated and comparison on the use of the two mentioned set of standards is performed. A case study referred to the 63 buses CJGRE network analyzed in the paper gives rise to interesting comments and discussion.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 113-119
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of voltage unbalance estimation in electric power networks
    Autorzy:
    Olczykowski, Z.
    Wąsowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/262813.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    voltage unbalance
    symmetric component
    differential coefficient
    differential angle
    Opis:
    Methods of voltage unbalance estimation based on the theory of symmetrical components and the method of differential — angular coefficients of asymmetry have been discussed. It has been proposed the last one to estimate the asymmetry of square absolute voltage value, as useful for distorted processes.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 71-76
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Error analysis of the three-phase electrical energy calculation method in the case of voltage-loss failure
    Autorzy:
    Cheng, Han-miao
    Wang, Zhong-dong
    Cai, Qi-xin
    Lu, Xiao-quan
    Gao, Yu-xiang
    Song, Rui-peng
    Tian, Zheng-qi
    Mu, Xiao-xing
    Powiązania:
    https://bibliotekanauki.pl/articles/221096.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    three-phase electrical energy meter
    voltage-loss failure
    voltage substitution
    three-phase voltage unbalance
    calculation error
    Opis:
    The single-phase voltage loss is a common fault. Once the voltage-loss failure occurs, the amount of electrical energy will not be measured, but it is to be calculated so as to protect the interest of the power supplier. Two automatic calculation methods, the power substitution and the voltage substitution, are introduced in this paper. Considering the lack of quantitative analysis of the calculation error of the voltage substitution method, the grid traversal method and MATLAB tool are applied to solve the problem. The theoretical analysis indicates that the calculation error is closely related to the voltage unbalance factor and the power factor, and the maximum calculation error is about 6% when the power system operates normally. To verify the theoretical analysis, two three-phase electrical energy metering devices have been developed, and verification tests have been carried out in both the lab and field conditions. The lab testing results are consistent with the theoretical ones, and the field testing results show that the calculation errors are generally below 0.2%, that is correct in most cases.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 3; 505-516
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of harmonics and voltage unbalance on the behavior of a five-phase permanent magnet synchronous machine
    Autorzy:
    Kebir, Ahmed Amine
    Ayad, Mouloud
    Kamel, Saoudi
    Powiązania:
    https://bibliotekanauki.pl/articles/2086721.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fault detection
    five-phase permanent magnet synchronous machine
    FPPMSM
    harmonics
    spectrum analysis
    voltage unbalance
    Opis:
    The development in industrial systems leads to the augmentation in the consumption of the power. Therefore, this development makes use of multiphase machines. The use of multiphase machines caused several problems and defects. Electrical energy is mainly distributed in a three-phase system to provide the electrical power necessary for the electrical engineering equipment and materials. The sinusoidal aspect of the required original voltage primarily preserves its essential qualities for transmitting useful power to terminal equipment. When the voltage waveform is no longer sinusoidal, perturbations are encountered, which generate malfunctions and overheating of the receivers and the equipment connected to the same electrical supply network. The main disturbing phenomena are harmonics, voltage fluctuations, voltage unbalances, electromagnetic fields, and electrostatic discharges. This present work aims to study the effects of harmonic pollution and voltage unbalance on the five-phase permanent magnet synchronous machine using spectrum current analysis and wavelet transform.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 2; 471--488
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of ant-colony algorithm to the issue of improving rectified voltage parameters in electric tram traction
    Autorzy:
    Kulesz, B.
    Sikora, A.
    Zielonka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/374940.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    ant colony optimization
    traction voltage
    tram traction
    voltage transformation
    tap changer
    distorted voltage
    voltage unbalance
    multi-winding transformer
    trakcja tramwajowa
    transformacja napięcia
    napięcie odkształcone
    nierównowaga napięć
    transformator wielouzwojeniowy
    optymalizacja kolonią mrówek
    napięcie sieci trakcyjnej
    przełącznik zaczepów
    Opis:
    In this paper, the problem related to transformation of ac voltage into DC voltage used in tram supply is considered. A variable component is always present in rectified voltage. Pulsation of rectified voltage is influenced by different factors. In a 12-pulse system, where two secondary transformer windings are used (one delta-connected and the other star-connected), an additional factor increasing the pulsation is the unbalance of the output voltages at these windings. Tap changer may be used and its setting is optimized here by applying the ant-colony algorithm. Different supply voltage variants have been considered. It is demonstrated that pulsation may be reduced by even 25%.
    Źródło:
    Transport Problems; 2018, 13, 2; 133-144
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long-Term Monitoring of Flicker and Some Other Parameters of Voltage Quality
    Autorzy:
    Krejci, P.
    Santarius, P.
    Gono, R.
    Brunclik, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/136258.pdf
    Data publikacji:
    2016
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    flicker
    unbalance
    voltage harmonics
    voltage quality
    Opis:
    In 1997 cooperation began between the Faculty of Electrical Engineering and Computer Science and the power company CEZ on a joint project that involved monitoring selected voltage quality parameters. Over the course of several years measurements were carried out at 59 points of the distribution system at a low voltage (LV) level and their power supply nodes at medium voltage (MV) and high voltage (HV) levels, which constituted more than 100 measured points. The measurements continued until 2012 (with a one-year break in 2009) and with a total scope of five cycles of three-year measurements. The last phase of the measurements was focused, inter alia, on the evaluation of 15th and 21st voltage harmonics. From 2013, the cooperation focused again on monitoring flicker in localities with the occurrence of elevated levels of this voltage quality parameter. At these sites, the monitoring of flicker was carried out for two weeks in spring and autumn for a period of three years. The basis for evaluating the quality parameters is the standard EN 50160. In addition the results of annual continual monitoring for one selected locality on MV level will be presented in the paper. In addition the possibility of utilization of intelligent electrometers for monitoring of some quality parameters will be referred in the paper.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2016, 1, 3; 1-8
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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