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    Wyświetlanie 1-8 z 8
    Tytuł:
    Comparison of transformer modeling on riser pole arresters behavior during switching transients
    Autorzy:
    Abbaszadeh, A.
    Abedi, M.
    Doustmohammadi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/140474.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arresters
    ATP software
    ferroresonance
    transformer
    power system transients
    Opis:
    Arresters are widely used in power systems to protect other equipment against overvoltages. However, in some conditions, they can’t operate successfully. One of the disturbances leading to the failure of the riser pole arresters is the ferroresonance overvoltages. In this paper, at first the influence of different transformer simulation models of ATP software on the occurrence of ferroresonance is studied and then the effect of ferroresonance on the riser pole arrester has been scrutinized through the thermal and electrical performance of the arrester in an underground distribution system. The results show that the arrester temperature rises due to energy dissipation in a ferroresonance circumstance, which indeed may result into the explosion of the arrester. Also, applying different models of the transformer in the ATP software and comparing the results, it is shown that the available models do not show the same effect on the arrester.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 4; 717-730
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on ferroresonance due to power transformer energization in high voltage 400 kV transmission grid
    Autorzy:
    Polewaczyk, Mateusz
    Robak, Sylwester
    Szewczyk, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/141509.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ferroresonance
    high voltage
    Poincaré map
    power system transients
    PSCAD
    Opis:
    This paper presents a study on ferroresonance occurring in a high voltage 400 kV transmission grid due to energization of power transformer under no-load conditions. The system scenarios analyzed in the present paper are considered as critical for development and modernization plans as currently announced by the national grid operator in Poland. The PSCAD simulation model was developed and applied for several study cases of a system with double-circuit arrangement of a transmission line. It is shown that the ferroresonant oscillations can be initiated by two-phase switching operation of a line circuit breaker. The impact of the double-circuit length on the ferroresonance mode and severity is demonstrated with the use of the Poincaré map analysis and Short Time Fourier Transform. It is demonstrated that the length of the transmission line that is mutually coupled in the double-circuit arrangement has a significant impact on the ferroresonance occurrence and on its mode. As the ferroresonance can pose severe threat to the power system components due to the severe overvoltage and overcurrent oscillations, the analysis presented in this paper demonstrates the necessity of the ferroresonance analyses for any re-designed transmission system.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 4; 771-786
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of synchronous generators for the analysis of frequency transients above 1 Hz/s
    Autorzy:
    Assenkamp, Alf
    Powiązania:
    https://bibliotekanauki.pl/articles/2135729.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control system
    distributed energy systems
    frequency support
    generator model
    RoCoF
    synchronous generators
    synchronous machines
    Opis:
    Large synchronous generators are of high importance for the stability of power systems. They generate the frequency of the system and stabilize it in case of severe grid faults like trips of large in-feeders or loads. In distributed energy systems, in-feed via inverters will replace this generation in large parts. Modern inverters are capable of supporting grid frequency during severe faults by different means on the one hand. On the other hand, higher Rates of Change of Frequency (RoCoF) after incidents need to be accustomed by future systems. To be able to analyse the RoCoF withstand capability of synchronous or induction generators, suitable models need to be developed. Especially the control and excitation system model need enhancements compared to models proposed in standards like IEEE Std 421.5. This paper elaborates on the necessary modelling depth and validates the approach with example results.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 3; 687--700
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics simulations of the electrodynamic railgun different constructions and their measurement verification
    Autorzy:
    Piekielny, Paweł
    Tomczuk, Bronisław
    Waindok, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/27309948.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    3D field analysis
    analysis of transients
    analytical models
    electrodynamic accelerator
    experimental verification
    field-circuit modeling
    projectile velocity
    Opis:
    Dynamic characteristics for three types of railgun constructions were simulated and measured in this work. The simplest construction is the iron-less (IL) railgun, while the two other ones (IC and ICPM) have an iron-core. The iron-core permanent magnet (ICPM) railgun additionally has permanent magnets. To compare their characteristics, similar dimensions of the rails and iron cores were adopted, and the same power supply system was used. Numerical magnetic field analyses and our analytical models have been used to determine the electromagnetic parameters. They were verified experimentally. The transient states of the railguns were studied with our field-circuit mathematical model, and their results were also verified by experiments.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 951--969
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transients of electrical and mechanical quantities of a brushless DC motor - computations, measurements
    Autorzy:
    Ciurys, M.
    Dudzikowski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/141324.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    maszyna elektryczna
    silnik bezszczotkowy
    magnes trwały
    silnik BLDC
    obliczenia
    pomiary
    electrical machines
    BLDC motors
    permanent magnets
    computations
    measurements
    Opis:
    The paper presents a method of computing electrical and mechanical variables of BLDC motors. It takes into account electrical, magnetic and mechanical phenomena in the power supply-converter-BLDC motor-load machine system. The solution to the problem is the so-called circuit-field method. The results determined with the use of time stepping finite element method were used as the parameters of equations of the developed mathematical model. Losses in the motor, losses in transistors and diodes of the converter as well as the actual back EMF waveforms, variable moment of inertia and variable load torque are accounted for. The designed laboratory stand and the test results are presented in the paper. The experimental verification shows the correctness of the developed method, algorithm and program. The developed computational method is universal with respect to different electromechanical systems with cylindrical BLDC motors. It can be applied to electromechanical systems with BLDC motors operating at constant but also variable load torque and moment of inertia.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 1; 23-34
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient recovery voltage analysis for various current breaking mathematical models: shunt reactor and capacitor bank de-energization study
    Autorzy:
    Oramus, P.
    Chmielewski, T.
    Kuczek, T.
    Piasecki, W.
    Szewczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140943.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arc modelling
    overvoltages studies
    EMTP-ATP program
    transients analysis
    Opis:
    Electric arc is a complex phenomenon occurring during the current interruption process in the power system. Therefore performing digital simulations is often necessary to analyse transient conditions in power system during switching operations. This paper deals with the electric arc modelling and its implementation in simulation software for transient analyses during switching conditions in power system. Cassie, Cassie-Mayr as well as Schwarz-Avdonin equations describing the behaviour of the electric arc during the current interruption process have been implemented in EMTP-ATP simulation software and presented in this paper. The models developed have been used for transient simulations to analyse impact of the particular model and its parameters on Transient Recovery Voltage in different switching scenarios: during shunt reactor switching-off as well as during capacitor bank current switching-off. The selected simulation cases represent typical practical scenarios for inductive and capacitive currents breaking, respectively.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 3; 441-458
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the stator inductances of the expanded Park model and an approach on parameter identification using the evolution strategy
    Autorzy:
    Schmuelling, Ch.
    Kreischer, Ch.
    Gołebiowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141147.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    evolution strategy
    FEM
    Park equations
    Park theory
    synchronous machines
    transients
    Opis:
    Commonly, the Park model is used to calculate transients or steady-state operations of synchronous machines. The expanded Park theory derives the Park equations from the phase-domain model of the synchronous machine by the use of transformations. Thereby, several hypothesis are made, which are under investigation in this article in respect to the main inductances of two different types of synchronous machines. It is shown, that the derivation of the Park equations from the phase-domain model does not lead to constant inductances, as it is usually assumed for these equations. Nevertheless the Park model is the most common analytic model of synchronous machines. Therefore, in the second part of this article a method using the evolution strategy is shown to obtain the parameters of the Park model.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 3; 585-599
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A coupled field-circuit model of a 5-phase permanent magnet tubular linear motor
    Autorzy:
    Tomczuk, B.
    Waindok, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/141318.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silnik synchroniczny liniowy
    magnes trwały
    PMLSM
    metoda polowo-obwodowa
    symulacja
    parametry sterowania
    permanent magnet linear synchronous motors
    field-circuit method
    simulation of the transients
    control parameters
    Opis:
    A method for modeling of the dynamics characteristics for a 5-phase permanent magnet tubular linear motor (PMTLM) is presented. Its electromagnetic nonlinear field analysis with finite element method (FEM) has been coupled with the circuit model. The calculation model includes the equations for electrical circuits and mechanical quantities as well. They have been obtained using Lagrange's method. The calculated and measured waves of the mover position have been compared for several values of the excitation current. This comparison yields a good agreement. Presented calculation model is very useful in designing and optimization of the PMTLM and in the calculation of the parameters for the control algorithms intended for such a type of actuators.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 1; 5-14
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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