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    Wyświetlanie 1-19 z 19
    Tytuł:
    Analysis of Transients in a Three-Level DC–DC Flying Capacitor Converter. Time Domain Approach
    Autorzy:
    Reznikov, Boris
    Ruderman, Alexander
    Galanina, Valentina
    Powiązania:
    https://bibliotekanauki.pl/articles/1193695.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    three-level DC–DC converter
    flying capacitor
    transient
    natural balancing
    Opis:
    The paper considers a discrete state-space model for transients in a three-level flying capacitor DC–DC converter. A transition matrix is obtained for a pulse width modulation (PWM) period. The matrix elements are expanded into a power series using a selected small parameter. The matrix eigenvalues that determine the natural balancing dynamics transients are presented in the form of power series as well. Four separate transients are constructed based on four possible PWM period initial states (topologies). Inductor current and capacitor voltage transients are found for the voltage source power-up as the arithmetic average of the four separate transients. The discrete solutions are replaced by continuous ones. The resulting transients that are elementary functions of the circuit parameters, PWM period, and voltage reference demonstrate good agreement with the simulation results.
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 33-45
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Transients in a 4-Level Flying Capacitor Converter: Time Domain Approach. Part 2: Small Normalised Voltage Command
    Autorzy:
    Reznikov, Boris
    Ruderman, Alex
    Galanina, Valentina
    Powiązania:
    https://bibliotekanauki.pl/articles/1193863.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    4-level DC–DC converter
    flying capacitor
    natural balancing
    transients
    Opis:
    A 4-level flying capacitor converter (FCC) operation is considered on a base of discrete state-space model. A transition matrix is obtained for a pulse width modulation (PWM) period for small normalised voltage command values [0, 1/3]. The transition matrix elements are expanded into power series by small parameters. The matrix eigenvalues are presented in the form of power series as well. Six separate transients are constructed for six possible initial FCC states on a PWM period. Inductor current and capacitors’ voltage transients are found for the voltage source power-up as the arithmetic average of the six separate transients. Finally, the discrete solutions are replaced by equivalent continuous ones. Simple and accurate formulas for inductor current and capacitors’ voltage transients demonstrate good agreement with simulation results.
    Źródło:
    Power Electronics and Drives; 2020, 5, 40; 41-57
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Transients in a 4-Level Flying Capacitor Converter: Time Domain Approach. Part 1: Large Normalised Voltage Command
    Autorzy:
    Reznikov, Boris
    Ruderman, Alex
    Galanina, Valentina
    Powiązania:
    https://bibliotekanauki.pl/articles/1193906.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    4-level DC-DC converter
    flying capacitor
    natural balancing
    transients
    Opis:
    A 4-level flying capacitor converter (FCC) operation is considered on a base of discrete state-space model. A transition matrix is obtained for a pulse width modulation (PWM) period for large normalised voltage command values [1/3, 1). The transition matrix elements are expanded into power series by small parameters. The matrix eigenvalues are presented in the form of power series as well. Six separate transients are constructed for six possible initial FCC states on a PWM period. Inductor current and capacitors’ voltage transients are found for the voltage source power-up as the arithmetic average of the six separate transients. Finally, the discrete solutions are replaced by equivalent continuous ones. Simple and accurate formulas for inductor current and capacitors’ voltage transients demonstrate good agreement with simulation results.
    Źródło:
    Power Electronics and Drives; 2020, 5, 40; 27-40
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    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:
    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:
    Compared analysis of the transients and the steady states of squirrel-cage motor and LSPMSM
    Autorzy:
    Barański, M.
    Idziak, P.
    Łyskawiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97457.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    squirrel-cage motor
    line start permanent magnet synchronous motor
    starting process
    heating
    functional parameters
    Opis:
    In the paper the transients under starting process and the steady states of squirrel-cage motor (IM) and line start permanent magnet synchronous motor (LSPMSM) have been compared. The original stator of 3 kW induction motor type Sg 100L-4B, was used in both structures. In order to determine opportunities to increase energy parameters of LSPMSM the heating curves of both motors were compared. In LSPMSM the rotor with aluminum and copper cage was used. The basic operating parameters of the two structures which are characterized by identical stators were tested. Particular attention has been given to the transient under starting process. Efficiency, power factor and current in the stator windings obtained during measurements for both structures have been presented. The paper focuses on achieving a much higher output power for LSPMSM than an induction motor of the same size. The selected results of experimental tests were shown.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 265-274
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of IGCT turn-on transients in circuit configurations with series connected diodes
    Autorzy:
    Tschirley, S.
    Bernet, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/262745.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Opis:
    This paper describes the effect of series connected diodes and their balancing networks m the clamp circuit in IGCT converters. It is shown, that the balancing of the clamp diodes has other requirements than the balancing of the series connected freewheeling diodes in the switch cell. The dynamic and static balancing of the clamp diodes is analyzed in detail.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 33-39
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza powównawcza stanów pracy silników indukcyjnego i synchronicznego z magnesami trwałymi i klatką rozruchową
    Compared analysis of the transients under starting process and the steady states of squirrel-cage motor and LSPMSM
    Autorzy:
    Barański, M.
    Idziak, P.
    Łyskawiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/377000.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    silnik synchroniczny magnetoelektryczny
    silnik indukcyjny
    rozruch
    nagrzewanie
    Opis:
    W artykule porównano pracę w stanie ustalonym i podczas rozruchu dwóch silników: synchronicznego magnetoelektrycznego o rozruchu bezpośrednim (LSPMSM) oraz indukcyjnego klatkowego (IM). W obu konstrukcjach wykorzystano stojan silnika indukcyjnego typu Sg 100L-4B o mocy 3 kW. W silniku synchronicznym zastosowano klatkę rozruchową wykonaną z aluminium i z miedzi. Zbadano proces rozruchu tych maszyn. W celu określenia możliwości polepszenia parametrów użytkowych silnika o magnesach trwałych porównano krzywe nagrzewania silników. Dla obu konstrukcji zestawiono wyznaczone na podstawie pomiarów wartości: sprawności, współczynnika mocy i prądów silnika. Zbadano możliwość uzyskania znacznie większej mocy użytecznej silnika magnetoelektrycznego w stosunku do silnika indukcyjnego mającego te same gabaryty.
    In the paper the transients under starting process and the steady states of line start permanent magnet synchronous motor (LSPMSM) and squirrel-cage motor have been. The stator of 3kW induction motor, Sg 100L-4B, was used in both structures. In order to determine opportunities to increase engine performance parameters of LSPMSM the heating curves of both motors were compared. In LSPMSM the rotor with aluminum and copper cage was used. The basic operating parameters of the two structures which are characterized by identical stators was compared. Particular attention has been given to the transient under starting process. Efficiency, power factor and current in the stator windings obtained during measurements for both structures have been presented. Particular attention was paid to the possibility to obtain much greater output power for LSPMSM than for induction motor of the same size. The selected results of experimental tests was shown.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 77; 155-163
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza zaburzeń piorunowych indukowanych w modelu wiązki kablowej statku powietrznego
    Analysis of lightning induced transients in an aircraft cable bundle model
    Autorzy:
    Filik, K.
    Masłowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/194214.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    przepięcia atmosferyczne
    wieloprzewodowa linia transmisyjna
    sprzężenia elektromagnetyczne
    ekranowanie przewodów
    badania eksperymentalne
    badania komputerowe
    lightning overvoltages
    multi-conductor transmission line
    electromagnetic coupling
    electromagnetic shielding
    experimental studies
    computer studies
    Opis:
    W artykule dokonano analizy zaburzeń pochodzenia piorunowego, indukowanych w odcinku modelowej wiązki kablowej, ułożonej nad płaszczyzną metalową, w oparciu o przedstawione wyniki badań eksperymentalnych oraz komputerowych. Do przygotowania układu fizycznego użyto typowych lotniczych przewodów i oplotu ekranującego. Badania przeprowadzono dla wybranych wartości obciążenia linii oraz przy kilku sposobach uziemienia ekranu otaczającego wybrane przewody. W nieekranowanej linii tej samej wiązki wymuszano przepływ prądu udarowego. Zarejestrowano przebiegi czasowe napięć i prądów w określonych punktach systemu, będące efektem obecności zaburzenia piorunowego oraz sprzężeń pojemnościowych i indukcyjnych pomiędzy przewodami. Wyniki badań eksperymentalnych były podstawą do weryfikacji rezultatów symulacji komputerowej wykonanej w pakiecie oprogramowania CST Studio Suite 2017. Na bazie przygotowanej struktury trójwymiarowej badanego układu program umożliwił uzyskanie obwodowego modelu linii transmisyjnej, użytego w późniejszych obliczeniach w dziedzinie czasowej. Badania wykazały zależność konfiguracji obciążenia linii i sposobu jej ekranowania na kształt i wartość szczytową obserwowanych przepięć w układzie. Rezultaty obliczeń komputerowych charakteryzowały się dobrą zgodnością z wynikami eksperymentalnymi. Różnice wynikały między innymi ze stopnia dokładności odzwierciedlenia struktury 3D modelu fizycznego, sposobu zdefiniowania prądu wymuszającego oraz parametrów samej symulacji komputerowej.
    The paper presents an analysis of lightning overvoltages induced in the section of cable harness, located above the conducive metal plane, based on the presented results of experimental and computer studies. For the preparation of the physical model, typical wires and braided shield for aviation industry were used. The tests were carried out for various harness configuration. First of all, both the values of the resistive loads on both ends of the wires and the method of grounding the screen surrounding the selected wires were changed. In the unshielded wire of the same bundle, the lightning current was forced using a single impulse generator MIG0618SS with high accuracy and repeatability of generated disturbances. The overvoltages were transferred to the other wires of the line by capacitive and inductive coupling. Voltage and current waveforms at specific points of the system were recorded using a digital oscilloscope. The results of experimental research were the basis for verification of the computer simulation computation made in the CST Studio Suite 2017 software package. On the basis of the prepared 3D structure of the studied system, the program made it possible to obtain an equivalent transmission line model, used for later calculations in the time domain. Studies showed a clear and also the expected relationship of load configuration and the shield grounding method of the cable bundle on the shape and peak value of transients observed in the system. The differences resulted among other, from the degree of 3D model accuracy and the method defining the forcing current and parameters of the simulation. It is planned to use the presented software in further work on the analysis of lightning induced signals in electrical and electronic systems.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika; 2018, z. 37 [297], nr 1, 1; 5-24
    0209-2662
    2300-6358
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wpływu uszkodzenia tranzystora IGBT falownika napięcia na przebiegi zmiennych stanu w napędzie indukcyjnym
    Analysis of the influence of IGBT transistor fault in voltage inverter to state variable transients of the induction motor drive
    Autorzy:
    Sobański, P.
    Orłowska-Kowalska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811989.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silnik indukcyjny
    falownik napięcia
    uszkodzenie łącznika
    diagnostyka uszkodzeń
    Opis:
    The aim of the paper is an analysis of the state variable transients in the direct oriented control of induction motor drive under open-switch fault of the voltage inverter. Study results that were presented, were obtained by simulation tests by MATLAB/Simulink environment. The paper is an introduction to the problem of power converter fault-tolerant control methods for electric drives.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 145-152
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Hydraulic Characteristics on Fluid Transients Analysis under Different Types of Control Valves
    Autorzy:
    Al-Zaidi, Basim M.
    Ismaeel, Abaas J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2202314.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    hydraulic characteristics
    fluid transients
    valve
    Opis:
    In this study, several types of valves were used to study the impact of the valves types and closure characteristics on fluid transients. The valve closure curves, which are the variation of the effective valve opening as a function of percentage opening area, were derived for different selected valves. Six different types of valves were selected to study the effect of the valves types on fluid transient conditions. For simplification, a very simple pipeline system was assumed and presented in this study. The system is about two pipes connected in a series junction and they take the water from a constant-level reservoir at upstream and a valve at downstream. The duration of valve closure was taken as six seconds which plays an important role in the pressure development in the system. A method of characteristics is applied to compute the transient conditions under gradual closure of the valves. Valve data of various forms were compiled and reported as discharge and headloss coefficients as a function of valve opening. The effect of valve geometry and operation on the relative valve opening were compared. Discharge and headloss coefficients were also compared between valve types. The study concluded that transient conditions depend on the valve type. The comparison between the results of all valve types indicated that the changes in pressure and discharges depend on valve type where there is a difference in effective valve opening. It can be concluded that the valve with the highest value of valve effective opening has less effect on transient conditions, i.e., the faster changes of effective valve opening the larger the effect on transient conditions (discharge and the greater the magnitude of the pressure wave). This study would help to select the property valve in pipeline design.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 12; 111--123
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydraulic transients analysis in pipe networks by the method of characteristics (MOC)
    Autorzy:
    Wichowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/240954.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    hydraulic transients
    method of characteristics
    single pipe
    experimental measurement
    pipe networks
    numerical simulations
    Opis:
    The paper presents results of an experimental and theoretical study of the hydraulic transients in straight pipes and numerical simulations of unsteady flow in pipe networks. A mathematical model consists of a set of partial differential equations of hyperbolic type, which have been transformed by the method of characteristics into ordinary differential equations which are solved by the predictor-corrector method. Experimental tests have been performed, in order to examine the hydraulic transients phenomenon, in a single straight steel pipe. The experiments were carried out in the hydraulic laboratory of the Institute of Water Supply and Water Engineering, Environmental Engineering Faculty, Warsaw University of Technology. The numerical results show that the presented one dimensional model for a single pipe correctly describes the phenomenon since there is a good agreement with experimental maximum and minimum oscillations. In the paper, selected exemplary equations in a difference form for the pipe networks are also presented. One calculation example is given relating to the complex water-pipe network consisting of 17 loops, 48 pipelines and 33 nodes, supplied by two independent sources. Water-hammer throughout the whole pipeline network was caused by closing the gate valve at mid-point of one selected pipe. The results of the numerical calculations are presented in graphic form with respect to the final cross-sections of pipes.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 3; 267-291
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the magnetostrictive actuator transients
    Autorzy:
    Idziak, P.
    Kowalski, K.
    Nowak, L.
    Barlak, M.
    Pochrybniak, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/377166.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    actuators
    magnetostriction
    electromagnetic field
    transient analysis
    Opis:
    The paper deals with a magnetostrictive fast-acting actuator applied as a driving device for plasma valve. The actuator is characterized by a relatively small displacement (les then 0.1 mm), but with a very short response time – below 0.1 ms. System is designed for so called “high intensity plasma pulses gun” which is applied in the area of plasma physics and material engineering [1]. A structure with an axisymmetrical actuator energised by discharged pulses of a capacitor has been proposed. The field-circuit mathematical model of the dynamic operation of the actuator has been applied. The model includes: the equation of transient electromagnetic field in a non-linear ferromagnetic material and equation of electric circuit. Using the Borland Delphi 9.0 environment, the computer software has been elaborated. Results of simulation are presented.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 83; 23-30
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accidents of loss of flow for the ETTR-2 reactor: deterministic analysis
    Autorzy:
    El-Messiry, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146728.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    design base accidents
    LOFA
    loss of flow
    pump coastdown
    reactor transients
    Opis:
    The main objective for reactor safety is to keep the fuel in a thermally safe condition with adequate safety margins during all operational modes (normal-abnormal and accidental states). To achieve this purpose an accident analysis of different design base accident (DBA) as loss of flow accident (LOFA), is required for assessing reactor safety. The present work concerns this transients applied to Egypt Test and Research Reactor ETRR-2 (new reactor). An accident analysis code FLOWTR is developed to investigate the thermal behaviour of the core during such flow transients. The active core is simulated by two channels: 1 - hot channel (HC), and 2 - average channel (AC) representing the remainder of the core. Each channel is divided into four axial sections. The external loop, core plene, and core chimney are simulated by different dynamic lumps. The code includes modules for pump coast down, flow regimes, decay heat, temperature distributions, and feedback coefficients. FLOWTR is verified against results from RETRAN code, THERMIC code and commissioning tests for null transient case. The comparison shows a good agreement. The study indicates that for LOFA transients, provided the scram system is available, the core is shutdown safely by low flow signal (496.6 kg/s) at 1.4 s where the HC temperature reaches the maximum value of 45.64°C after shutdown. On the other hand, if the scram system is unavailable, and at t=47.33 s, the core flow decreases to 67.41 kg/s, the HC temperature increases to 164.02°C, and the HC clad surface heat flux exceeds its critical value of 400.00 W/cm2 resulting from the fuel burnout.
    Źródło:
    Nukleonika; 2000, 45, 4; 229-233
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of operability of Peltier modules in cooling systems based on the analysis of transient operating modes
    Autorzy:
    Kuzichkin, Oleg Rudolfovich
    Konstantinov, Igor Sergeevich
    Vasilyev, Gleb Sergeevich
    Surzhik, Dmitry Igorevich
    Powiązania:
    https://bibliotekanauki.pl/articles/1845461.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric system
    agriculture
    complex
    transients
    peltier effect
    identification algorithms
    Opis:
    The paper is devoted to the control of operability of Peltier modules based on the analysis of transient modes of their operation. Advantages of using low-power thermoelectric modules for the development of thermoelectric plants with adaptive control systems for the needs of the agricultural complex, which significantly reduce their cost characteristics, are shown. The problem of using the stationary mode of their operation, associated with the low efficiency of the modules, as well as the dynamic mode, associated with the presence of transient processes, is indicated. It is noted that overcoming this problem requires solution of the task of automation of reliability providing the well-known approaches to its solution are shown, for which the key advantages and disadvantages are given. An approach is proposed to complex control of the operability and quality of thermoelectric modules during their expluatation in three components of the physical process of thermoelectric conversion (Peltier thermoelectric effect, electrical and thermal transfer phenomena) by analyzing transients in the system based on identification algorithms. To justify it, the necessary equations and mathematical relations are given. Aprobating of the proposed approach was carried out experimentally by determining the time constants for operable and defective commercially available modules and showed its significant advantages over the standard verification procedure.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 2; 31-42
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel power quality data analysis and reporting framework for wide-area system of registration and processing of power quality data
    Autorzy:
    Rezmer, J.
    Leonowicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/136208.pdf
    Data publikacji:
    2015
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    power quality
    faults
    power distribution
    reliability
    power system restoration
    power system transients
    relational databases
    distributed generation
    voltage dips
    GIS
    data visualization
    data analysis
    localization of disturbances
    Opis:
    This paper presents a novel method for data analysis and visualization, including real-time visual monitoring and proposal for combined area PQ indices on the example of the developed and operational comprehensive system of registration, archiving and data processing for the wide-area monitoring of power quality in a separated part of real power grid with distributed renewable generation. Real case studies related to power quality disturbances are presented.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2015, 1, 1; 1-3
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza procesów zachodzących podczas załączania transformatora pieca łukowego zasilanego z układu z filtrami wyższych harmonicznych
    Transients analysis during arc furnace transformer energization in environment of harmonic filters
    Autorzy:
    Warecki, J.
    Gajdzica, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/377163.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    prąd rozruchowy
    transformator piecowy
    filtr wyższych harmonicznych
    Opis:
    Praktyka eksploatacji układów zasilania pieców łukowych prądu przemiennego pokazała, że wielokrotne komutacje technologiczne transformatorów piecowych mogą stać się przyczyną uszkodzenia transformatora systemowego i innych urządzeń sieci zasilającej. W pracy zbadano wpływ konfiguracji sieci zasilającej na charakter procesów przejściowych jednostki piecowej średniej mocy 50 MVA. Analizę zachodzących procesów przejściowych w układzie zasilania pieca łukowego przeprowadzono stosując model zrealizowany w pakiecie Matlab/Simulink.
    The practice of operating AC electrical arc furnace power supply systems has shown that frequent energizing unloaded furnace transformer can cause damage of the system transformer and other system devices. To examination of supply system configuration impact on switching transient nature an example of 50 MVA arc furnace unit was chosen. The transient analysis has been carried out by simulating within Matlab/Simulink software.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 79; 279-287
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obliczenia elektromagnetyczne przetwornika o ruchu złożonym opartego na wspólnym obwodzie magnetycznym
    Analysis of the Dynamic and Stationary States of a Car Starter with Permanent Magnet Motor
    Autorzy:
    Ciurys, M.
    Dudzikowski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368124.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    maszyny elektryczne
    rozruszniki samochodowe
    magnesy trwałe
    przebiegi czasowe
    electrical machines
    car starters
    permanent magnets
    transients
    Opis:
    Using field – circuit method transients of the electric and magnetic quantities of the developed car starter motor with ferrite magnets were determined at dynamic and stationary operating conditions. These results were used, in the developed mathematical model, algorithm and software, to determine mechanical and electrical transient in the system: battery – electrical motor – mechanical transmissions – combustion engine. Transients of the analysed electromechanical system were determined taking into account the variations of inertia, the variations of the load torque generated by combustion engine and the influence of the temperature on the battery parameters, magnets parameters and load torque generated by the combustion engine. Electromechanical characteristics of the car starter were determined.
    Metodą polowo-obwodową wyznaczono przebiegi czasowe wielkości elektrycznych i magnetycznych w opracowanym silniku rozrusznika samochodowego z magnesami ferrytowymi w dynamicznych i ustalonych stanach pracy. Wyniki te wykorzystano w opracowanym modelu matematycznym, algorytmie i programie do wyznaczania przebiegów wielkości mechanicznych i elektrycznych w układzie: akumulator – silnik elektryczny – przekładnie mechaniczne – silnik spalinowy. Wyznaczone przebiegi czasowe w analizowanym układzie elektromechanicznym uwzględniają zmienność momentu bezwładności i zmienność momentu obciążenia generowanego przez silnik spalinowy oraz wpływ temperatury na parametry akumulatora, parametry magnesów i na moment obciążenia generowany przez silnik spalinowy. Wyznaczono charakterystyki elektromechaniczne rozrusznika.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2013, 3, 100/1; 141-146
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wpływu sposobu namagnesowania magnesów na przebiegi czasowe wielkości elektrycznych i mechanicznych w silniku bezszczotkowym
    Analysis of the permanent magnets magnetization on the transients of the electrical and mechanical quantities of a brushless dc motor
    Autorzy:
    Ciurys, M.
    Dudzikowski, I.
    Kmieć, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813548.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silnik bezszczotkowy
    magnesy trwałe
    przebiegi czasowe
    obliczenia
    pomiary
    Opis:
    Circuit-field models of the brushless DC motor with parallel and radial magnets magnetization were developed. Transients of the electrical and mechanical quantities of the motor were determined at parallel and radial magnets magnetization. Experimental verification was carried out. The computed and the measured transients were compared.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 258-266
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-19 z 19

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