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Wyświetlanie 1-15 z 92
Tytuł:
Control strategy of thyristors switched SVCs with high power quality
Autorzy:
Panfilov, Dmitry Ivanovich
ElGebaly, Ahmed
Astashev, Michael
Rozhkov, Alexander Nikolaevich
Powiązania:
https://bibliotekanauki.pl/articles/136218.pdf
Data publikacji:
2019
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
static VAR compensators
thyristor switched reactors
thyristor switched capacitors
Opis:
In this paper, new static VAR compensators SVCs schemes for inductive and capacitive reactive power are developed. The provided schemes improve the flexibility and power system quality of SVCs by developing new circuit topologies with new control strategy of the reactive power. New circuit schemes are introduced for thyristors switched reactors TSR and thyristors switched capacitors TSC to design harmonic-free SVC with higher discrete number of reactive power levels. This paper provides the control algorithm and block diagram of the new SVCs schemes. The switching strategies of TSR and TSC are described and implemented. The new scheme of TSC requires special modifications to decrease transient effects and implementation of specific switching strategies to acquire SVC with high power quality indexes.
Źródło:
Transactions on Environment and Electrical Engineering; 2019, 3, 1; 15-20
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Switched reluctance motor drive control algorithms with single line position feedback signal usage and custom phase locked loop microcontroller implementation
Autorzy:
Fabianski, B
Powiązania:
https://bibliotekanauki.pl/articles/97676.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
switched reluctance motor
SRM
electric motor
Opis:
There was presented a frequency multiplication of a single, binary rotor position feedback signal implementation in the article. This technique was necessary to achieve wide-speed control range and improved dynamics. In the beginning a basics of the switched reluctance motors construction were described as the control system challenges were. A nature of the reduced up to one position feedback signal interface line was shown as the reference for phase locked loop system. The problem of low resolution and asymmetrical shape of the mechanical position sensor was described with its solving by embedded system optimized SPLL loop usage. There were appropriate theory dependencies introduced for phase locked loop system as confirming experimental results were shown. In the summary, conclusions were made and the further research steps were proposed. Additionally, custom made drive system for switched reluctance motor and the motor as the control object itself were introduced.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 171-180
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of two identical ns laser pulses at single μs spacing by switching output mirror transmission
Autorzy:
Skórczakowski, Marek
Żendzian, Waldemar
Jankiewicz, Zdzisław
Powiązania:
https://bibliotekanauki.pl/articles/220917.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
double pulse Q-switched laser
pulsed holographic interferometry
transmission losses switching
diode pumped Q-switched laser
Opis:
Generation of two identical ns laser pulses spaced by a single μs time interval by means of sequential switching of the output mirror transmittance in a diode-pumped Nd:YAG laser is reported, to our knowledge, for the first time. The theoretical study of the process of transmission losses switching is developed. This analysis confirms the possibility of generation of two identical Q-switched laser pulses with 100% efficiency with respect to the referenced single pulse energy. The detailed characterization of the laser in free-running, single and double Q-switching regimes is presented. The laser can be applied in different branches of metrology as PIV, LIBS or holographic interferometry.
Źródło:
Metrology and Measurement Systems; 2020, 27, 3; 513-530
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Searching for An Optimal Switched Reluctance Motor Design
Autorzy:
Jażdżyński, W.
Majchrowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/141079.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switched reluctance motor
optimization
analytical model
Opis:
An approach helpful when developing an optimized construction of a 6/4 type switched reluctance motor (SRM) is described in the paper. The analytical modeling procedure, based on the reluctance network method and analytical solution of an ordinary differential equation, enables applying a gradient optimization routine and better control of optimization process. The model allows for estimation of the efficiency, torque, and acoustic noise of the motor taking into account the magnetic non-linearity and the control algorithm to keep a constant input power. A bicriterial optimization routine has been applied to find optimal constructions. Eleven geometric and winding parameters are supposed to be the optimization quantities. Analyzed constructions – the initial one and the optimized ones, were validated by means of FEM calculations. The proposed approach can be employed in designing the SRM to be a drive motor in an electrical vehicle, at least as a first attempt.
Źródło:
Archives of Electrical Engineering; 2014, 63, 4; 667-682
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency improvement of switched reluctance generator using optimization techniques
Autorzy:
Reis, M. R. C.
Araújo, W. R. H.
Calixto, W. P.
Powiązania:
https://bibliotekanauki.pl/articles/136169.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
switched reluctance generator
optimization
control
genetic algorithm
Opis:
This article introduces the switched reluctance machine operating as a generator. This kind of electrical machine delivers CC power at the output and the energy generated can be controlled through several variables. In this work, the switching angles of the machine's power converter are optimized using deterministic and heuristic techniques so that the output power is kept constant via PI controller while guaranteeing maximum value for machine performance, even for different excitation values and mechanical power on the shaft.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 1; 74-80
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of circuits with switched capacitors and inductances
Autorzy:
Lipiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/376749.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
numerical analysis
switched capacitors
inductance
electric circuit
Opis:
The purpose of the paper is to present numerical calculations for circuits with switched capacitors and inductances. Computer simulations have been carried out for an exemplary circuit using PSpice software. Then the analysis has been performed for the circuit according to the numerical algorithm.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 155-160
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new C-dump converter for performance improvement of SR motor drive: conceptual considerations and simulations
Autorzy:
Wróbel, K.
Tomczewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/97321.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
switched reluctance motors
electrical drives
power electronics
Opis:
In the article a new type of the C-dump converter type was presented, it was intended to supply switched reluctance drives, which is a modification of the configuration introduced in [1]. A structure and a principle of its working were discussed. In this construction independent supplying sections for each motor phase were used. Differences in construction and working both of the configurations and their influence on efficiency of the drive were discussed. Model results of simulation calculations of electromagnetic torque and phase current waveforms were presented. Applying the new system caused the increase in the efficiency of the drive.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 288-293
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Switched Current Sigma-Delta Modulator with a New Comparator Structure Designed Based on VHDL-AMS Description
Autorzy:
Śniatała, P
Handkiewicz, A
Naumowicz, M.
Szczęsny, S.
Melosik, M.
Katarzyński, P.
Kropidłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/227188.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switched current
VHDL-AMS
sigma-delta modulator
Opis:
The paper presents a VHDL-AMS based approach to the Switched-Current (SI) Sigma-Delta Modulator design. The prototype VHDL-AMS description, with the help of elaborated EDA tools, is automatically translated into the SI realization. Another tool helps the designer to create the layout. The paper also describes a new current mode comparator, which is used in the design. Postlayout simulation results are presented.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 4; 391-396
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamically programmable analog arrays in acoustic frequency range signal processing
Autorzy:
Falkowski, P.
Mechler, A.
Powiązania:
https://bibliotekanauki.pl/articles/221037.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FPAA
audio processing
switched-capacitor
analog circuits design
Opis:
Field programmable analog arrays (FPAA), thanks to their flexibility and reconfigurability, give the designers quite new possibilities in analog circuit design. The number of both academic projects on FPAA and applications of commercially available programmable devices is still growing. This paper explores the properties and parameters of two most popular FPAA circuits: the AnadigmVortex AN221E04 and AnadigmApex AN231E04 from the Anadigm company. The research conducted by the authors led to the discovery of some undocumented features of these devices. Several applications for audio processing were built and tested. The results show that these circuits can be used in medium-demanding audio applications. Thanks to dynamic reconfigurability, they also allow to build an universal analog audio signal processor. These circuits can also act as a versatile platform for rapid prototyping and educational purposes.
Źródło:
Metrology and Measurement Systems; 2011, 18, 1; 77-89
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of a two-phase transverse flux switched reluctance motor with an outer rotor
Autorzy:
Łukaniszyn, M.
Kowol, M.
Kołodziej, J.
Powiązania:
https://bibliotekanauki.pl/articles/140820.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transverse flux switched reluctance motor
outer rotor
optimization
Opis:
This paper presents optimization results for a two-phase, modular transverse flux switched reluctance motor (TFSRM) with an outer rotor. In particular, the main disadvantage of the considered motor structure, that is the zero starting torque in some rotor positions, is eliminated by construction optimization. A numerical model of the motor developed in the Flux3D program is coupled with a Matlab-based evolutionary algorithm for optimization of construction parameters of the magnetic circuit. The elaboratem algorithm is also connected with a database to limit the computation costs. Three objective functions are taken into account for the motor integral parameter improvement. The fundamental role of a type of an optimization criterion function is comparatively analyzed and a new effective criterion function is introduced.
Źródło:
Archives of Electrical Engineering; 2012, 61, 4; 567-578
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boosting resonant switched-capacitor voltage tripler
Autorzy:
Chojowski, Maciej
Sosnowski, Robert
Baszyński, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/24202737.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
boost topology
DC–DC converters
switched capacitor converter
Opis:
This elaboration presents the concept of a unidirectional DC–DC switchedcapacitor converter operating as a voltage tripler. The system consists of two resonant cells with switched capacitors and chokes. This proposed converter topology achieves low voltages on semiconductor switches (diodes and transistors) compared to the classic SC series-parallel converter or the boost topology. The output voltage on the capacitors is reduced in the proposed converter because it is divided into two series-connected capacitors with asymmetric distribution. The presented results describe the analytical description of the system operation and the analytical equation for semiconductor currents. A simulation and experimental results have been performed. The system efficiency and three voltage gain values were measured in the experimental setup. The efficiency measured was also compared with the analytical determination curve for loss analysis and further converter optimization.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 373--389
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control method of high-speed switched reluctance motor with an asymmetric rotor magnetic circuit
Autorzy:
Bogusz, P.
Korkosz, M.
Prokop, J.
Powiązania:
https://bibliotekanauki.pl/articles/140576.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switched reluctance motor
SRM
power converter
electromagnetic torque
Opis:
In the paper, the modified (compared to the classical asymmetric half-bridge) converter for a switched reluctance machine with an asymmetric rotor magnetic circuit was analysed. An analysis for two various structures of switched reluctance motors was conducted. The rotor shaping was used to obtain required start-up torque or/and to obtain less electromagnetic torque ripple. The discussed converter gives a possibility to turn a phase off much later while reduced time of a current flows in a negative slope of inductance. The results of the research in the form of waveforms of currents, voltages and electromagnetic torque were presented. Conclusions were formulated concerning the comparison of the characteristics of SRM supplied by the classic converter and by the one supplied by the analysed converter.
Źródło:
Archives of Electrical Engineering; 2016, 65, 4; 685-701
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fourier expansion solution for a switched shunt control applied to a duct
Rozwiązanie Fouriera dla przewodu akustycznego z bocznikującym układem sterowania
Autorzy:
Ameduri, S.
Ciminello, M.
Powiązania:
https://bibliotekanauki.pl/articles/280041.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
synchronised switched shunt control
piezoelectric
pressure sound level
Opis:
In the present work, a semi analytic approach aimed at estimating the effects on reduction of the pressure sound level by synchronised switched shunt logic is described. The displacement field within a 1D longitudinal air column through a Fourier series expansion has been formalised by assigning a sinusoidal perturbation and fluid-structure interface condition on the left and right boundaries, respectively. To simulate the no control operative condition, the solution has been computed for the entire time domain, keeping invariant all circuitry properties; then for the switch working modality, the solution has been computed by splitting the entire time domain into partitions; for any partition, specific circuitry properties (e.g. piezo voltage, electrical field...) have been selected. Based on the displacement information, the related sound pressure level has been compared for no controlled and controlled operative conditions, with and without signal amplification.
W pracy zaprezentowano pół-analityczne rozwiązanie zagadnienia redukcji poziomu ciśnienia akustycznego w przewodzie za pomocą zsynchronizowanej metody bocznikowania. Opis pola przemieszczeń wewnątrz jednowymiarowej kolumny powietrza sformalizowano rozwinięciem w szereg Fouriera przy uwzględnieniu sinusoidalnie zmiennych zaburzeń na prawym i lewym brzegu przewodu. Dla przypadku z wyłączonym układem sterowania rozwiązanie obliczono w całej dziedzinie czasu przy utrzymaniu stałych parametrów obwodu elektrycznego, natomiast dla trybu sterowanego dokonano analizy, dzieląc przedział czasu na fragmenty. W każdym z nich charakterystyczne cechy układu sterowania (np. napięcie przykładane do piezoelektryków, natężenie pola elektrycznego...) dobrano w odpowiedni sposób. Na podstawie obserwacji przemieszczeń porównano poziom ciśnienia akustycznego dla warunków z wyłączonym i włączonym sterowaniem oraz z i bez wzmocnienia sygnału.
Źródło:
Journal of Theoretical and Applied Mechanics; 2010, 48, 2; 479-504
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of positive fractional switched continuous-time linear systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/201380.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional
positive
switched
linear
asymptotic stability
continuous-time
Opis:
The asymptotic stability of positive fractional switched continuous-time linear systems for any switching is addressed. Simple sufficient conditions for the asymptotic stability of the positive fractional systems are established. It is shown that the positive fractional switched systems are asymptotically stable for any switchings if the sum of entries of every column of the matrices of all subsystems is negative.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 349-352
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple sufficient conditions for asymptotic stability of positive linear systems for any switchings
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/201683.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
positive
linear
switched system
asymptotic stability
sufficient conditions
Opis:
The asymptotic stability of positive switched linear systems for any switchings is addressed. Simple sufficient conditions for the asymptotic stability of positive switched continuous-time and discrete-time linear systems are established. It is shown that the positive switched continuous-time (discrete-time) system is asymptotically stable for any switchings if the sum of entries of every column of the matrices of subsystems is negative (less than 1)
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 343-347
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 92

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