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Wyświetlanie 1-15 z 25
Tytuł:
Analysis of parallel resonance RLCα circuit with supercapacitor
Autorzy:
Walczak, J.
Jakubowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/97419.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
phase resonance
supercapacitor
parallel RLCα circuit
Opis:
The paper describes the results of analysis on the resonance phenomenon in a parallel RLCα circuit with supercapacitor modeled as a fractional-order capacitance. A complex, more accurate fractional-order model has been taken into analysis. Formulas for frequency characteristics and resonance conditions have been derived and presented by simulation studies of the concerned fractional-order system.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 30-37
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Short-circuit duration and dynamic forces in central section of substation
Autorzy:
Frąckowiak, R.
Piechocki, P.
Powiązania:
https://bibliotekanauki.pl/articles/97305.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
EHV distribution substations
short-circuit dynamic effects
simulations
Opis:
Presented topic is the continuation of investigations concerning the estimation of short-circuit duration when computing the short-circuit effects using probabilistic methods. In the paper, an expanded model of distribution substation for simulation-based analysis of the short-circuit conditions and dynamic effects in the central section of bus-bar is presented. In the model, the operation of protections in the transformer bay has also been considered. The results of simulations aiming to assess the frequency of occurrence of the defined values of short-circuit current, short-circuit duration and dynamic forces are reported. Also, the question: “How the transformer’s protections involved in simulation affect the simulated short-circuit conditions?” has been answered. Computations have been carried out for four different EAZ system configurations.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 220-230
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joule’s heat generated during a short-circuit current flow in function of phase angle
Autorzy:
Książkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/97577.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Joule's heat
circuit breaker
let-through energy
Opis:
Joule's heat (let-through energy) is an important factor in proper protection of electrical installations and devices. Studies were preformed during which the relationship between amount of energy and phase angle of short-circuit current was examined. Typically used miniature circuit breaker was utilized as a protective device. Scilab software for numerical computation was used to calculate the let-through energy based on recorded oscillograms of short-circuit current. Results of this calculations are presented.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 162-170
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Values of short-circuit duration and dynamie forces during short-circuits in the EHV substations: simulation-based investigations
Autorzy:
Frąckowiak, R.
Piechocki, P.
Powiązania:
https://bibliotekanauki.pl/articles/97694.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
short-circuit duration
EHV substations
simulation
Opis:
Presented question is the continuation of investigations concerning the short-circuit duration’s estimation in the short-circuit effect calculations using the probabilistic method. In the paper, the developed simulation model of the short circuit duration under the disturbing conditions just in the distribution substation is presented. The model development was based on the analysis of operation of the automatic power protections EAZ and circuit-breakers in the EHV substations during short-circuits. The results of simulation investigations aiming to estimate the frequency of occurrence of the defined short-circuit duration are reported. The calculations have been carried out for different configurations of the EAZ system. For selected spans in the 220 kV substation, probabilistic analysis of dynamic forces accompanying the in-substation faults has been carried out. Also, the way of the short-circuit duration’s estimation when calculating the dynamic effects of the fault current flow basing on an assumed risk value has been proposed.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 171-184
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of snubber circuit design for SiC power MOSFET devices
Autorzy:
Niewiara, Ł. J.
Skiwski, M.
Tarczewski, T.
Grzesiak, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/97236.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC\DC converter
snubber circuit
SiC MOSFET
Opis:
In this paper a design process of snubber circuit for DC\DC converter is presented. Computer simulation and experimental tests were carried out. Due to the presence of parasitic LC (inductance and capacitance) circuit in the power stage, it is necessary to use an additional snubber circuit for voltage overshoot and oscillations reduction. A simulation model of the converter with parasitic circuit was designed. Six topologies of snubber circuits (C, single C, RC, single RC, RCD, single RCD) were investigated in simulation tests. Simulation model of the proposed system has been investigated in Matlab/Simulink/PLECS environment. Input signal parameters like voltage overshoot, rise time, fall time were compared for considered snubber circuits. Experimental tests were carried out for the best simulation results. It confirm the proper choice of snubber circuit.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 120-131
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Based on neural network adaptive linear quadratic regulator for inverter with voltage matching circuit
Autorzy:
Niewiara, Ł.
Tarczewski, T.
Grzesiak, L.M.
Powiązania:
https://bibliotekanauki.pl/articles/97686.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
adaptive linear-quadratic regulator
voltage matching circuit
artificial neural network
current ripple
Opis:
This paper describes a discrete adaptive linear quadratic regulator used to load current control in terms of variable DC voltage of inverter. Controller was designed by using linear quadratic optimization method. Adaptive LQR was used because of non-stationarity of the control system caused by Voltage Matching Circuit - VMC. Gain values of the adaptive controller were approximated by using an artificial neural network. The VMC was realized as an additional buck converter integrated with the main inverter. As the load of the 2-level inverter a 3-phase symmetric RL circuit was used. Simulation tests show the behavior of the load current regulation during DC bus voltage level step changes. The dependence between current RMS value and inverter DC bus voltage level was also shown. There were also made a comparison of the traditional 2-level inverter structure with the modified structure uses VMC. Simulation test was made by using Matlab Simulink and PLECS software.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 434-443
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of circuit and operation for DC–DC converter based on silicon carbide
Autorzy:
Niewiara, Ł. J.
Tarczewski, T.
Grzesiak, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/97287.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC\DC converter
SiC MOSFETS
high switching frequency
DC–DC converter design
snubber circuit
Opis:
In this paper operating analysis of DC–DC converter is presented. Silicon Carbide based DC–DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC–DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). Real power semiconductors are equipped in output and input capacitances. This feature may influence the generated input signal. Parasitic capacitances and inductances of the paths causes oscillations and voltage overshoots of the input PWM signal. To avoid such phenomenon, it is necessary to use a snubber circuit. This issue is also presented. The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 268-279
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Naval mine detection system based of FPGA circuit
Autorzy:
Wołoszyn, M.
Łubkowski, J.
Chomnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/97240.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
FPGA
naval mines
electrical conductivity
Opis:
Electrochemical processes take place in a metal object immersed into sea water even if an anticorrosive coating is applied [1]. As a result, flowing field appears around the object. There are naval mines between many other objects situated in the sea. Naval mines can be put in the seabed in order to be more difficult to detect by sonars. Such a mine is located on the line demarking two environments of different electrical conductivity. The results of a computer analysis of the influence of seabed’s electrical conductivity on the electric field’s disposition around a mine model are shown below. Also, a naval mine detection system based on the FPGA circuit is presented.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 60-68
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Driver’s interface of the racing car
Autorzy:
Jajczyk, J.
Słomczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/97501.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
driver's interface
dashboard
racing car
electronic circuit design
Opis:
The paper presents the design of the driver’s desktop for the racing car. The first part of the article reviews the available interfaces of the driver used in the racing cars. The examples of steering wheels with the implemented systems that enable the driver to control the selected parameters of the vehicle were presented. The necessary components of the driver’s desktop were set out, which should be applied in the designed system. The second part of the paper presented the idea schemes of the electrical circuits of the applied modules. The focus was mainly on the elements that enable the information to the driver on the current parameters of the car. The support for the LED and LCD displays and the UART module designed for communication were implemented. The interface presented in the paper was developed for the purpose of using it in the racing car of the Formula Student class.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 520-530
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positive electrical circuits with zero transfer matrices and their discretization
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/97201.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
positive electrical circuit
reachability
observability
stability
discretization
transfer matrix
Opis:
Positive continuous–time and discrete–time linear electrical circuits with zero transfer matrices are addressed. It is shown that there exists a large class of positive electrical circuits with zero transfer matrices. The electrical circuits are unreachable, unobservable and unstable for all values of the resistances, inductances and capacitances. The discrete–time linear positive electrical circuits are introduced. It is shown that: 1) the discrete–time electrical circuit is asymptotically stable for all values of the discretization step if and only if the corresponding continuous–time electrical circuit is asymptotically stable; 2) the discretization of the continuous–time electrical circuit does not change their reachability, observability and transfer matrices.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 1-13
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circuit analysis of magnetic couplings between circular turn and spiral coil
Autorzy:
Wciślik, M.
Kwaśniewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/97519.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
spiral coil
magnetic coupling
circumferential equation
Opis:
The paper deals with magnetic coupling between circular turns, modelling of spiral coil arranged concentrically on a plane and the single forcing turn. The turns are organized in axially symmetric arrangement. Circular turns are made of nonferromagnetic conductor. The equations of the magnetic field distribution around a single turn with current were derived from the Biot-Savart law, taking into account the turn wire radius Using the Biot-Savart law, equations describing the distribution of the magnetic field around a single turn with current, taking into account the radius of the turn wire, were derived. An original relation was obtained. It which allows to calculate self inductance of a single turn and mutual inductances relative to the other turns. The inductance matrix of the individual coil turns was derived from obtained formulas.From the formula inductance matrix of turns set of the spiral coil model was built. The spiral coil inductance was derived from inductance matrix of the adopted coil modelSpiral coil inductance has been described on the basis of the established coil model inductance matrix. The self inductance of the forcing coil, as well as the mutual inductance between forcing coil and the individual turns of the spiral coil were derived from the Biot-Savart lawSimilarly self inductance of the forcing coil and mutual inductance vector between the forcing turn and the each turn of spiral coil model were described.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 82-91
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the pulse transformer using circuit-field model
Autorzy:
Łyskawiński, W.
Knypiński, Ł.
Nowak, L.
Jędryczka, C.
Powiązania:
https://bibliotekanauki.pl/articles/1395761.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
pulse transformer
optimization
genetic algorithm
Opis:
The paper presents the new strategy of the optimization of pulse transformer (PT). In order to reduce calculation time the optimization problem has been decomposed into two stages. In the first stage, to determine functional parameters of PT the circuit model is used. The goal of circuit calculations is to limit the space of design variables that meets formulated requirements. The genetic algorithm has been applied for this task. In order to include constraints, the penalty function has been engaged. The transformer dimensions obtained in the first stage of calculations are used as initial values in the second stage of design process. In the second stage the field model of PT is employed. Obtained results prove that presented approach allows for fast optimization of the PT design.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 159-167
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring technical systems with the use of relational fuzzy cognitive maps
Autorzy:
Słoń, G.
Yastrebov, A.
Powiązania:
https://bibliotekanauki.pl/articles/97199.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
RLC circuit
fuzzy cognitive map
cognitive map
Opis:
In this work, a certain approach to the modeling dynamic states in technical systems is presented. This approach consists in a replacing the classic differential model with a model based on relational fuzzy cognitive map. Described method is illustrated on a practical example of a simple electrical RLC circuit. The method of preparation of the normalized reference data was described. The process of building a relational fuzzy cognitive map with concepts crucial from the modeling purpose point of view is presented; also the results of such a map learning process are shown. At the end a partial comparison of simulation results of work of models: classic - based on the set of differential equations and proposed - based on relational fuzzy cognitive map is performed.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 442-452
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of long-term cable lines load in real operating conditions
Autorzy:
Wesołowski, M.
Niedbała, R.
Kucharski, D.
Hauser, J.
Powiązania:
https://bibliotekanauki.pl/articles/97431.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
cable lines
circuit
electric installations
Opis:
In the article some basic aspects of numerical modeling of cable lines were discussed. Some often found cases, where the cable lines are placed in cable conduits and cable culverts, were analyzed. The analysis results were compared to the classical, circuit-models based approach of such issues. Basic sources of classical models errors, resulting from difficulty to precisely determine the real environmental quantities were calculated and discussed. Utility of numerical, field models was shown and influence of basic simplifications on calculating results was determined.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 205-217
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the transient state in RCα circuit at periodic voltage excitation
Autorzy:
Jakubowska, A.
Walczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/97447.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
fractional-order differential equation
transient state
supercapacitor
Opis:
The paper describes the results of analysis of the transient state in a simple series RCα circuit with supercapacitor. A simple fractional-order supercapacitor model has been introduced to the analysis. The considered system has been supplied by a periodic voltage source. Selected results of the simulation studies, carried out in Mathematica, Maple and PSpice have also been presented.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 42-50
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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