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Tytuł:
Wpływ technologicznych odchyleń parametrów filtrów harmonicznych na stany przejściowe w sieciach przemysłowych
Impact of filter circuit manufacturing tolerances on industrial supply system transients
Autorzy:
Warecki, J.
Gajdzica, M.
Powiązania:
https://bibliotekanauki.pl/articles/376396.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
bateria kondensatora
dławik filtrujący
filtr wyższych harmonicznych
strojenie projektowe i dokładne
kompensator statyczny SVC
proces przejściowy
komutacje łączeniowe
Opis:
Praktyka eksploatacji układów kompensacyjno-filtrujących w różnych topologiach i systemach zasilana pokazała, że strojenie filtrów powinno odbywać się dla częstotliwości nieco niższej, niż wielokrotność częstotliwości podstawowej. W pracy, w oparciu o model zrealizowany w pakiecie Matlab/Simulink zbadano wpływu technologicznych odchyleń parametrów elementów filtru na występujące stany przejściowe. Poprzez zmianę strojenia jednostki filtrującej, utożsamianą ze zmianą tolerancji indukcyjności dławika oraz pojemności baterii kondensatorów filtru, porównano wartości udarów prądowych i przepięć generowanych na elementach układu filtrującego podczas komutacji łączeniowych.
The practice of operating multiple, single-tuned FC units in different power supply systems has shown that harmonic filters tuning should be carried out for lower frequencies than multiple of network frequency. To examination of the filter components parameters tolerances impact on switching transients Matlab/Simulink software was chosen. The influence of the filter tuning on switching transients behavior under arc furnace unit and harmonic filters energizing was analyzed. The paper focuses on the comparison of the switching transients due to different tolerances of air-core reactor inductances and capacitor bank capacitances in single and multiple harmonic filters configurations.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 90; 89-100
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nasycenia obwodu magnetycznego i wypierania prądu na przebiegi momentu elektromagnetycznego i prądu podczas rozruchu wysokoobrotowych silników klatkowych
Influence of the saturation of the magnetic circuit and skin effect on the transients of electromagnetic torque and current during the start up of high-speed motors
Autorzy:
Zielińska, M.J.
Zieliński, W.G.
Powiązania:
https://bibliotekanauki.pl/articles/1372567.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
silnik elektryczny
silnik klatkowy
silnik wysokoobrotowy
rozruch silnika
obwód magnetyczny
moment elektromagnetyczny
Opis:
High speed squirrel-cage motors are a relatively unknown group of machines, mainly due to their particular application. High rotational speed is achieved by supplying the motors with 400-1500Hz frequency voltage. Their operation in special conditions results in the fact that their structure and some properties differ from those of squirrel-cage induction machines supplied with 50Hz frequency voltage. The use of closed rotor slots causes strong saturation of the magnetic circuit for the slot leakage flux. Changes in the current in the slot causes a varying state of saturation and thus rotor leakage inductance is not a constant parameter. When determining the rotor winding leakage inductance for classic induction motors supplied with 50Hz frequency voltage, the influence of the saturation of the magnetic circuit for the leakage flux is usually omitted. This is a standard approach and an equivalent scheme, mentioned in literature, is used in such a case. Identification of the inductance in motors supplied with high frequency voltage, in which the phenomenon of core saturation occurs, is a relatively complex issue due to the complicated distribution of magnetic flux, and especially the leakage flux. The value of leakage inductance was determined experimentally. The paper presents differential equations describing a mathematical model and transients of the current and electromagnetic torque, obtained by simulating the start-up of a squirrel-cage high-speed motor.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2011, 3, 91; 183-186
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ charakterystyk eksploatacyjnych sieci przemysłowych na dobór parametrów filtrów harmonicznych
Impact of industrial network operating characteristics on the harmonic filter parameters sizing
Autorzy:
Warecki, Jurij
Gajdzica, Michał
Powiązania:
https://bibliotekanauki.pl/articles/268765.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
filtr wyższych harmonicznych
stany ustalone
stany przejściowe
bateria kondensatora
dławik filtrujący
harmonic filter
steady state
transients
capacitor bank
air-core filter reactor
Opis:
Układy kompensacji mocy biernej oraz filtracji, oparte na kondensatorach znajdują powszechne zastosowanie w praktycznych rozwiązaniach systemów przemysłowych. Ich parametry znamionowe wyznaczane są wyłącznie w oparciu o harmoniczne prądów oraz napięć w stanach ustalonych, niemniej jednak tyczy się to głównie jednostek filtrujących o prostej topologii. Stąd, mając na uwadze bardziej złożone układy w większości przypadków istniejących lub nowoprojektowanych obiektów wymaga się, aby analizowane układy były dostosowane do pracy zarówno w warunkach ustalonych jak i przejściowych. Korzystając ze standardów oraz norm, w artykule omówiono procedurę doboru parametrów baterii kondensatorów oraz dławików układów filtrujących z pozycji ich bezawaryjnej pracy w elektrycznych sieciach przemysłowych. Zaproponowana metoda ma wspomóż działania projektowe filtrów harmonicznych.
The application of harmonic filter circuit based on power capacitor banks are widely used in practical solutions in industrial systems. The component ratings of these units are often specified based solely on a combination of steady state fundamental and harmonic voltages and currents. Although, this may be adequate in single-tuned or single branch units and method may not properly rate the components for more complex applications such as multiple, single-tuned harmonic filter circuits in compensated installations. Thus, in the most cases of commonly used or newly designed circuits are required to be adapted to operate as well in steady state and transients conditions. Using the exsisting Standards, the article propose a method for determining equipment ratings parameters of the capacitor banks and air-core filter reactors according to malfunctions. The study illustrated in this paper will be used to support and improve harmonic filter realiability and design. It is hoped that ideas will be a resource for a future filter application guide being contemplated by the capacitor subcommittee.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2019, 67; 47-51
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration transients of reservoir-pipe-valve system caused by water hammer
Autorzy:
Miao, Yang
Jiang, Yuncheng
Qiu, Zaihui
Pan, Jun
Wang, Lu
Han, Zhenrong
Li, Kun
Zhang, Li
Zhang, Xiaolu
Powiązania:
https://bibliotekanauki.pl/articles/1839616.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
reservoir-pipe-valve system (RPV system)
water hammer
vibration
transients
Opis:
A severe oscillation, accompanied with an abnormal “click” sound, of a fuel feeding pipe system during valve closing, when the feeding flowrate reaches a certain value, is observed experimentally. A fluctuation model in which stiffness and damping coefficients of the vibration system are time varying is proposed. Each coefficient is composed of two parts, one of which is constant and the other is time varying. Based on this model, simulation transients of the vibration displacement, velocity and pressure in the pipe are presented. Simulations of the pressure transients are compared with experimental data detected by pressure transducer, which shows that both have fluctuations in the transient process at a large flowrate.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 1037-1048
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transients under energizing multiple power filter circuits
Autorzy:
Warecki, J.
Gajdzica, M.
Powiązania:
https://bibliotekanauki.pl/articles/97327.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
capacitor
reactor
harmonic filter
C–type filter
Static Var Compensator
transient overcurrent
transient overvoltage
dynamic overcurrent
dynamic overvoltage
switching transients
Opis:
The practice of operating reactive power compensation systems involving passive multiple filter circuits (FC) configured by single–tuned filters has shown, that it’s energizing can cause damage of the filter components. Impact of feasible FC configurations, including FC with a C–type filter, on switching overvoltages and overcurrents under the harmonic filters energizing were analyzed. Influence of the filters tuning on transient behavior has been shown. The transient analysis has been carried out by simulating of the FC within Matlab/Simulink software.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 89-100
1508-4248
Pojawia się w:
Computer Applications in 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:
Transients of Carrier Recombination and Diffusion in Highly Excited GaN Studied by Photoluminescence and Four-Wave Mixing Techniques
Autorzy:
Juršėnas, S.
Miasojedovas, S.
Kurilčik, G.
Žukauskas, A.
Aleksiejūnas, R.
Malinauskas, T.
Sūdžius, M.
Jarašiūnas, K.
Powiązania:
https://bibliotekanauki.pl/articles/2041739.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
72.20.Jv
78.55.Cr
Opis:
Time-resolved photoluminescence and four-wave mixing techniques have been combined for studies of carrier relaxation dynamics in a highly photoexcited GaN epilayer. For a moderate excitation density below 1 mJ/cm$\text{}^{2}$, carrier recombination was due to free carrier capture by deep traps. The characteristic time of carrier capture,τ$\text{}_{e}$=550 ps, was measured under deep trap saturation regime. The ambipolar diffusion coefficient for free carriers, D=1.7 cm$\text{}^{2}$/s, was estimated from the analysis of the transients of the light-induced gratings of various periods. A complete saturation of the four-wave mixing efficiency was observed for the excitation energy density exceeding 1.5 mJ/cm$\text{}^{2}$. The latter saturation effect was shown to be related to electron-hole plasma degeneration, which results in a significant enhancement of carrier recombination rate due to onset of stimulated emission.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 240-244
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transients in Transformers with Non-Uniform Inductance and Capacitance Distributions
Autorzy:
Saied, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/262695.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
distributed parameter circuits
electromagnetic transients
integro-differential equations
modeling
mutual parameters
non-uniform
power transformers
transient response
winding
Opis:
The electromagnetic transients in transformer windings exhibiting location–dependent inductances and capacitances are investigated in the time domain. Analytical functions describing this dependence are assumed and incorporated in the two integro–differential equations governing the transient voltage and current distributions. The boundary conditions are available from the source initiating the transients and the winding’s end termination. A numerical procedure is applied in order to get frequency domain solutions for the voltage and current in the form of Interpolating and Parametric Functions. The numerical Laplace inversion is then applied to these s–domain expressions. Results pertinent to transients initiated by step- and double-exponential impulse sources are presented and discussed. All possible transformers’ neutral connections are considered. The possible error introduced by neglecting either or both of the inductance and capacitance non-uniformities is addressed. Results indicate that the main error is attributed to neglecting the inductance non-uniformity, whereas the impact of the capacitance non-uniformity is relatively small. In most cases, the winding’s copper and insulation losses have a small effect on the transient response.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2017, 20, 1; 7-14
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transients impact on power filter circuit sizing
Autorzy:
Warecki, J.
Gajdzica, M.
Powiązania:
https://bibliotekanauki.pl/articles/97523.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
capacitor
reactor
harmonic filter
transient and dynamic overvoltage
transient and dynamic overcurrent
equipment ratings
Opis:
The practice of operating multiple single-tuned filters in AC electrical arc furnace power supply systems has shown, that frequent energizing unloaded furnace transformer can cause damage of the filters. To examination of supply and filter system configuration impact on switching transient and dynamic overvoltages and overcurrents, an example of 50 MVA arc furnace unit was chosen. The transient analysis has been carried out by simulating within Matlab/Simulink Software. Using ANSI/IEEE Standards paper focuses on the selections of ratings for capacitors and air-core reactors used in multiple single-tuned harmonic filters configurations. Comparison of filter reactor and capacitor bank design based on steady state operation and transformer energizing was shown.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 111-119
1508-4248
Pojawia się w:
Computer Applications in 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:
Transformer Modelling for the Frequency and Transient Analyses, with Non-Uniform Inductance Emulating the Inter-Turn Magnetic Coupling
Autorzy:
Saied, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/262677.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
distributed parameter circuits
frequency response
modeling
power system transients
power transformers
resonance
non-uniform
Opis:
A new procedure for analyzing power transformer windings with location-dependent circuit parameters, such as the series inductance, is presented. This dependence is introduced in order to take the inter-turn mutual inductive coupling into consideration. It can be expressed either by analytical expressions or even in a tabulated form. The paper addresses both the frequency and time domain analyses. They are based on replacing the winding by an adequate number of equivalent cascade connected two-ports. In contrast to the usual practice of applying the simple medium line representation, each of these two-ports is treated as a long transmission line. Their A, B, C, D generalized circuit constants will be therefore generally location-and frequency-dependent. The analyses will be conducted in the complex s-domain. The corresponding time-domain results can then be obtained by applying a numerical inverse Laplace transform. Expressions for the winding’s input impedance with different treatments of the transformer’s neutral point will be derived for any assumed number of the equivalent two-ports. Results pertinent to the frequency characteristics including the resonance frequencies are presented. The paper also describes the winding’s transient response to the application of two standard voltage stimuli. The suggested approach is validated by its application to a case study for which an analytical closed-form solution is available. The analysis of windings exhibiting nonuniformities in more than one equivalent.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2014, 17, 1; 1-11
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time and electric energy losses minimization in speed control of induction motors
Autorzy:
Kawecki, L.
Niewierowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/205536.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optymalizacja
sterowanie optymalne
zasada maksimum
electric energy losses minimization
electromagnetic transients
induction motors
machine control
optimal control
optimal frequency starting
speed control
Opis:
The paper presents a method for solving the problem of the simultaneous time and electric energy losses minimization during the frequency speed control of induction motors with the electromagnetic transients. To solve this vector optimization problem, the optimization index in the form of linear combination of the scalar indexes is assumed and the Pontryagin maximum principle is used. Examples of solution for two cases of optimal frequency starting of two induction motors are presented.
Źródło:
Control and Cybernetics; 1999, 28, 2; 331-353
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Transient Performance of Partially-Undergrounded Overhead Lines in the Presence of Corona
Autorzy:
Saied, Mohamed M.
Powiązania:
https://bibliotekanauki.pl/articles/262791.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
distributed parameter circuits
non-uniform lines
power transmission lines
line modeling
transients
power networks
mixed
overhead-cable lines
partial undergrounding
distributions
mathematica
Opis:
The paper presents a method for investigating the electromagnetic transients of partially under-grounded high voltage overhead transmission lines in the presence of corona. It is based on a time domain model in which the corona is simulated by distributed voltage-dependent shunt current sources. The line segments and the inserted cable section are represented by a single equivalent transmission element having location-dependent circuit parameters per unit length. The numerical solution of the resulting set of differential equations yields the distributions of the voltage, the longitudinal current and the shunt corona current (per unit length) as functions of location and time. The presented two-, three-dimensional and contour plots proved to be helpful in discussing these distributions and in identifying any eventual current and/or voltage concentrations. The developed computer code in Mathematica can handle any time waveform of the source initiating the transients, any line termination as well as any lengths of the overhead line and cable section.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2019, 21, 1; 1-8
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The modeling of centrifugal pump transients
Autorzy:
Szymczyk, J.
Karaśkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/175255.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rotodynamic pumps
complete pump characteristics
transients
Opis:
Centrifugal pumps are part of larger hydraulic systems. These hydraulic machines can work not only in the pumping mode but in a number of other modes whose job description is possible using complete characteristics. Some of these modes, such as the turbine mode and the reversed turbine mode, may have practical significance. Knowledge of the transition from one steady state to another state allows to estimate instantaneous values such as, e.g., flow current and torque, which may be even a few times higher than nominal. The principal issues in these transients are amplitudes of parameters of these pumps and the time constants associated with the characteristics of the system.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 130; 83-92
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical solutions for the control and command system of a Plasma Focus device
Autorzy:
Martin, D. I.
Zoita, V. I.
Cotruta, D. A.
Jianu, A. V.
Ighigeanu, D. I.
Bestea, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/147621.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
control system
electromagnetic transients
galvanic separation
plasma focus
Opis:
The paper presents the technical problems related to the electrical control and command system (ECC system) for the plasma focus installation IPF-4/5A having the following main parameters: 1 MA plasma current and 40 kJ energy stored at 20 kV charging voltage. The ECC system applies 23 interlocked logical commands, acquires and processes 28 logical states, acquires, processes and displays continuously the main slow-varying signals coming from IPF-4/5A subassemblies. All the plasma focus installation operational sequences are governed by strict hard and soft interlocking using in parallel two control and command systems: one based on PC-control methods and another based on classical control techniques.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 89-91
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
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