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Wyszukujesz frazę "AC power system" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Modelling and analysis of the quadrature-booster phase shifter with PWM AC bipolar matrix-reactance chopper and passive load
    Autorzy:
    Fedyczak, Z.
    Jankowski, M.
    Szcześniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/262819.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    AC power system
    phase shifter
    PWM AC matrix chopper
    Opis:
    This paper deals with a quadrature-booster phase shifter for power flow control and for transient stability improvement in AC transmission systems. The PWM AC bipolar matrix chopper (MC) is proposed for the control of the qudrature voltage component of the original voltage. There are presented in this paper both steady and transient state analyses of a transmission system with passive load based on averaged circuit models. Furthermore, simulation and experimental test results obtained in a three-phase 3 kVA laboratory model are also presented.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 83-93
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of different methods for excitation of synchronous machines
    Autorzy:
    Schmuelling, S.
    Kreischer, Ch.
    Gołȩbiowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367718.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    AC machines
    Brushless machines
    Electromagnetic transients
    Excitation system
    Power system simulation
    Opis:
    The energy turnaround in Germany leads to new operating conditions for small and medium synchronous generators. Since the electricity generation through renewable energy sources, such as wind or photovoltaic, is highly volatile, generators have to run up from standstill into rated operation within several minutes. Hence, it is necessary to compensate a lack of electricity generation caused by wrong weather forecasts. Usually, gas turbine systems provide this possibility. The generator is used as a starter engine due to the connection to a frequency inverter. The excitation current is often provided by static excitation systems. Thus, it is possible to start from standstill and run up the drive until the gas turbine is able to generate a positive torque. A new excitation concept, based on an induction machine with a 3-phase rotor winding, is able to provide an excitation current at 0 rpm and eliminates the need for brushes. To verify the applicability for power systems, both systems are compared under different aspects. The control of the excitation current at different speeds and the possibility to settle shaft oscillations after electrical faults are aspects researched in the paper at hand. A power system simulation is performed with a synchronous machine connected to a grid. Both excitation systems are modeled by equivalent circuit diagrams in Matlab Simscape.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2015, 3, 107; 89-93
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wind turbine harmonics caused by unbalanced grid currents
    Autorzy:
    Dettmann, K. D.
    Schostan, S.
    Schulz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/262590.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    AC machines
    circuit analysis
    current measurement
    harmonic analysis
    harmonic distortion
    power system harmonics
    power system measurements
    sequences
    wind energy
    wind power generation
    Opis:
    For wind turbines that feed into public grids limits for voltage and current harmonics must be assured. To verify that the actual levels are valid, measurements are necessary. Problems can occur to determine which part of these harmonics has its origin in the wind turbine. It is shown that also harmonics which originally have zero sequences can be transferred over a delta-star-transformer, if the currents of the wind turbine are asymmetric due to unbalanced loads. Measurements in an existing wind turbine configuration are discussed, which confirm the described effects.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 17-23
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of UPFC for enhancement of voltage profile and minimization of losses using Fast Voltage Stability Index (FVSI)
    Autorzy:
    Kumar, S.
    Renuga, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/140514.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flexible AC transmission system (FACTS)
    real and reactive power
    Unified Power Flow Controller (UPFC)
    Bacterial Foraging (BF) algorithm
    Opis:
    Transmission line loss minimization in a power system is an important research issue and it can be achieved by means of reactive power compensation. The unscheduled increment of load in a power system has driven the system to experience stressed conditions. This phenomenon has also led to voltage profile depreciation below the acceptable secure limit. The significance and use of Flexible AC Transmission System (FACTS) devices and capacitor placement is in order to alleviate the voltage profile decay problem. The optimal value of compensating devices equires proper optimization technique, able to search the optimal solution with less computational burden. This paper presents a technique to provide simultaneous or individual controls of basic system parameter like transmission voltage, impedance and phase angle, thereby controlling the transmitted power using Unified Power Flow Controller (UPFC) based on Bacterial Foraging (BF) algorithm. Voltage stability level of the system is defined on the Fast Voltage Stability Index (FVSI) of the lines. The IEEE 14-bus system is used as the test system to demonstrate the applicability and efficiency of the proposed system. The test result showed that the ocation of UPFC improves the voltage profile and also minimize the real power loss.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 2; 239-250
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Execution of New Interleaved Single-Stage of Three-Phase Ac-Dc Converter with Power Factor Correction Using Space Shift Pulse Width Modulation
    Autorzy:
    Sowntharya, S.
    Sureshkumar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192665.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AC-DC converter
    power factor correction
    space vector phase-shifted modulation
    three-phase converter
    three-phase system
    transformer circuit
    Opis:
    In this project is addressed to the function of AC-DC converter operation and its modulation techniques. In recent years to developing pulse width modulation to used power conversion process. The many techniques of PWM to improve power production program. In this project focused Addresses a cost-effective, flexible solution of improvement of efficiency to three phase AC-DC converter using SVPWM(space vector pulse width modulation).The proposed converter has a better efficiency, especially under light-load condition and it was explained that this is because the energy from the output inductor can always be used to ensure that the very top and the very bottom switches can be turned ON with ZVS due to a discharge path that is introduced by its flying capacitor.
    Źródło:
    World Scientific News; 2016, 47, 2; 176-189
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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