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Wyświetlanie 1-15 z 47
Tytuł:
Improvisation process for banks capacitor compensation applied fuzzy logic knowledge for nodal detection on electrical network
Autorzy:
Gasbaoui, B.
Oudda, M.
Nasri, A.
Powiązania:
https://bibliotekanauki.pl/articles/384634.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
capacitor placement
fuzzy logic
Harmony Search Optimization (HSO)
capacitor seizing
power flow
Opis:
The main problem of electrical distribution systems is the reactive power flow. It causes reduction of active power transmission, diminishes power losses, and augments the drop voltage. In this research we described an efficiency approach FLC-HSO to solve the optimal power flow (OPF) combinatorial problem. The proposed approach employ tow algorithms, Fuzzy logic controller (FLC) algorithm for nodal detection and harmony search optimization (HSO) algorithm for optimal seizing capacitor of OPF combinatorial problem control variables. HSO method is more proficient in improving combinatory problem. The proposed approach has been examined and tested on the standard IEEE 57-bus test system with different objectives that reflect cost function minimization, voltage profile improvement, and voltage stability enhancement. The proposed approach results have been compared to those that reported in the literature recently. The results are promising and show the effectiveness and robustness of the proposed approach.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2011, 5, 4; 11-16
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural capacitor voltage balance in multilevel flying capacitor converters. A review of research achievements
Autorzy:
Stala, R.
Powiązania:
https://bibliotekanauki.pl/articles/1193250.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flying capacitor converter
natural capacitor voltage balance
multilevel converter
inverter
DC-DC converter
Opis:
The flying-capacitor (FC) topology is one of the more well-established ideas of multilevel conversion, typically applied as an inverter. One of the biggest advantages of the FC converter is the ability to naturally balance capacitor voltage. When natural balancing occurs neither measurements, nor additional control is needed to maintain required capacitors voltage sharing. However, in order to achieve natural voltage balancing suitable conditions must be achieved such as the topology, number of levels, modulation strategy as well as impedance of the output circuitry. Nevertheless this method is effectively applied in various classes of the converter such as inverters, multicell DC-DC, switch-mode DC-DC, AC-AC, as well as rectifiers. The next important issue related to the natural balancing proces is its dynamics. Furthermore, in order to reinforce the balancing mechanism an auxiliary resonant balancing circuit is utilized in the converter which can also be critical in the AC-AC converters or switch mode DC-DC converters. This paper also presents an issue of choosing modulation strategy for the FC converter due to the fact that the natural balancing process is well-established for phase shifted PWM whilst other types of modulation can be more favorable for the power quality.
Źródło:
Power Electronics and Drives; 2016, 1, 36/2; 5-33
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capacitor Energy Variations in MMC Using Harmonics Injection
Autorzy:
Hafeez, Kamran
Khan, Shahid A.
Van den Bossche, Alex
Eddinne, Kamel Djamel
Powiązania:
https://bibliotekanauki.pl/articles/1193856.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
MMC
HVDC
power converter
capacitor energy
Opis:
Modular multilevel converter (MMC) is considered as a good technology for high-voltage direct current (HVDC) transmission systems. It can generate a good quality staircase output voltage waveform due to the cascaded connection of large number of identical sub-modules (SMs). Energy variations in SM capacitor lead to capacitor voltage fluctuations which affect the size and stability of MMC. Traditionally MMC arm voltages are controlled using direct modulation method. The closed loop and open loop compensated modulation methods are implemented to overcome the drawbacks created in direct modulation method. However, these methods rely on the accurate measurements or estimation of SM capacitor voltages. In this paper, capacitor energy variations in MMC based on direct modulation method under three different categories using proportional-resonant (PR) controllers are discussed as (a) pure sinusoidal arm current (b) sinusoidal arm current with addition of large 2nd harmonic (c) sinusoidal arm current with addition of 2nd +4th harmonics. Analytical and simulation results show reduction in capacitor energy variations in MMC while injecting harmonics in the arm currents using direct modulation method.
Źródło:
Power Electronics and Drives; 2020, 5, 40; 97-107
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical capacitor temperature fluctuations during charging/discharging processes
Autorzy:
Galla, Stanisław
Szewczyk, Arkadiusz
Lentka, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/220829.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrochemical capacitor
statistical parameters
quality
thermography
Opis:
The paper presents a proposal of using additional statistical parameters such as: standard deviation, variance, maximum and minimum increases of the observed value that were determined during measurements of temperature fields created on the surface of the tested electrochemical capacitor. The measurements were carried out using thermographic methods in order to support assessment of the condition of electrochemical capacitor under classic durability tests based on methods of determination of capacity and equivalent series resistance. The possibility of using some statistical parameters in assessment of the electrochemical capacitor quality was illustrated. The applied measurement methodology and the results of research associated with the classic methods of supercapacitors’ assessment are presented. The obtained results indicate that the variability of some statistical parameters of temperature fields can be directly related to changing the values of standard parameters describing electrochemical capacitor, which are capacitance and equivalent series resistance.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 23-35
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The flying-capacitor SEPIC converter with the balancing circuit
Autorzy:
Kawa, A.
Stala, R.
Powiązania:
https://bibliotekanauki.pl/articles/141719.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SEPIC converter
natural balancing
flying-capacitor
Opis:
The paper presents investigation results of the natural balancing phenomena in the flying-capacitor SEPIC converters. The SEPIC converters topologies can be reconfigured to the flying-capacitor topology. Owing to this modification the advantageous increase of frequency of the current in the chokes and the decrease of semiconductors voltages can be achieved which is shown in this paper. Similarly to other multilevel flying capacitor topologies the adequate voltage sharing of the flying capacitors is an important issue for safe operation of the converter. The paper focuses on the analysis of the flying capacitor voltages balancing in the converter by natural currents as well as by the application of the additional RLC balancing booster. The paper proves that the natural balancing can be achieved by the specific application of the balancing circuit in the flying-capacitor SEPIC topology and proves the specific differences in the balancing process by natural currents of converter and with the usage of the balancing circuit. An operation of the converter with the balancing circuit and the natural balancing ability is studied here.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 411-424
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional derivatives in electrical circuit theory – critical remarks
Autorzy:
Sikora, R.
Powiązania:
https://bibliotekanauki.pl/articles/141068.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dimensional uniformity
physical equations
capacity
super capacitor
Opis:
A number of critical remarks related to the application of fractional derivatives in electrical circuit theory have been presented in this paper. Few cases have been pointed out that refer to observed in selected publications violations of dimensional uniformity of physical equation rules as well as to a potential impact on the Maxwell equations.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 155-163
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Optimum Value of Y-Capacitor for Reducing Emi in Switch Mode Power Supplies
Autorzy:
Jha, M. M.
Naik, K. B.
Das, S. P.
Powiązania:
https://bibliotekanauki.pl/articles/262807.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
EMI
CM noise
touch current
Y-capacitor
Opis:
Putting a Y-capacitor between the primary ground and secondary ground is a common practice in industry to reduce EMI; but, this capacitor increases touch current. A method is discussed to measure the touch current at circuit design level. An optimum value of Y-capacitor is predicted without exceeding touch current limit. Experimental results of touch current measurements and EMI measurements are analyzed.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2009, 15, 2; 47-50
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
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:
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:
gC-Studio – the environment for automated filter design
Autorzy:
Katarzynski, P.
Melosik, M.
Handkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/201387.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gyrator-capacitor prototype circuits
filter approximation
EDA
CAE
Opis:
The paper presents the idea of software suite integrating the tools supporting the analog filter design. It uses the prototype circuits that are composed of gyrators and capacitors. The essential, behavioral parameters are characterised for the filtering structures. The basic assumptions formulated before the implementation are also mentioned. The structure of the software suite is discussed, its functional properties and the implementation issues are mentioned. The resulting software brings the automation of designing SISO filters as well as the filter pairs. In the proposed solution the VHDL-AMS language is assumed as the formal method of hardware description.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 541-544
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of mathematical model of thermal behavior of electronic components for lifetime estimation based on multi-level simulation
Autorzy:
Frivaldsky, M.
Pridala, M.
Drgona, P.
Powiązania:
https://bibliotekanauki.pl/articles/140808.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrolytic capacitor
lifetime model
lifetime estimation
system-level simulation
Opis:
The main purpose of the paper is the proposal of multi-level simulation, suited for the evaluation of the lifetime of critical electronic devices (electrolytic capacitors). The aim of this issue is to imagine about the expected operation of complex and expensive power electronic systems, when the failure of the most critical component occurs. For that reason, various operational conditions and various physical influences must be considered (e.g. mechanical, humidity, electrical, heat stress), where nonlinearities are naturally introduced. Verification of the proposal is given, whereby the life-time estimation of an electrolytic capacitor operated in a DC-DC converter during various operational conditions is shown. At this point electrical and heat stress is considered for lifetime influence. First, the current state in the field of mathematical modeling of the lifetime for electrolytic capacitors, considering main phenomena is introduced. Next, individual sub-models for multi-level simulation purposes are developed, including a thermal simulation model and electrical simulation model. Several complexities of individual models are mutually compared in order to evaluate their accuracy and suitability for further use. Proper simulation tools have been mutually linked and data transfer was secured, in order to have the possibility of investigation of a lifetime depend on the changes of various variables.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 339-350
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On and Off Chip Capacitor Free, Fast Response, Low Drop-out Voltage Regulator
Autorzy:
Prasad, Guru
Shama, Kumara
Powiązania:
https://bibliotekanauki.pl/articles/955942.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
voltage regulator
capacitor free LDO
fast response
area efficient
Opis:
A low drop-out [LDO] voltage regulator with fast transient response which does not require capacitor for proper operation is proposed in this paper. Recent cap-less LDOs do not use off chip capacitor but instead they use on chip capacitor which occupy large area on chip. In the proposed LDO this on chip capacitor is also avoided. A novel secondary local feed-back technique is introduced which helps to achieve a good transient response even in the absence of output capacitor. Further a self compensating error amplifier is selected to eliminate the need of compensating capacitor. Stability analysis shows that the proposed LDO is stable with a phase margin of 78 0. The proposed LDO is laid out using Cadence spectre in 180 nm standard CMOS technology. Post layout simulation is carried out and LDO gives 6mV/V and 360μV /mA line and load regulation respectively. An undershoot of 120 mV is observed during the load transition from 0 mA to 50 mA with 1 μs transition time, however LDO is able to recover within 1.4μs. Since capacitor is not required in any part of design, it occupies only 0.010824 mmXmm area on chip.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 159-165
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power Loss Reduction With Optimal Size And Location Of Capacitor Banks Installed At 132 kv Grid Station Qasimabad Hyderabad
Autorzy:
Katyara, S.
Shah, M. A.
Iżykowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/410606.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
capacitor bank
power loss
voltage profile
distribution system
MATLAB
Opis:
With Growing Concerns About Voltage Profile And Power Factor At Distribution Networks, The Capacitor Banks Are Invariably Installed For Reactive Power Compensation. The Reactive Power Supplied By Capacitor Banks Is Proportional To Square Of Their Rated Loading Voltage. Capacitor Banks Eventually Increase The Loading Capacity Of Feeders, So As To Supply More Customers Through Same Line Section. Capacitor Banks Can Be Installed Anywhere On The Network. The Idea Of This Paper Is To Reduce Total Power Loss And Ensure Greater Availability Of Capacitor Bank Installed At 132 Kv Grid Station Qasimabad Hyderabad, For Reactive Power Compensation, Even Under Worst Conditions On Distribution System. This Is Achieved By Enhancing Its Location And Size. At Present Capacitor Bank Of Full Size, I.E. Of 1.21 Mvar Is Installed At 11 Kv Bus Of 132 Kv Grid Station Qasimabad Hyderabad. Moreover This Paper Suggests Small Sized Capacitor Banks That Would Be Installed At Different Feeders Instead Of One Large Size Capacitor Bank At 11 Kv Bus. The Voltage Profile And Power Losses With Present Sized Capacitor Bank And The Proposed Small Sized Capacitor Banks Are Compared In This Work. The Distribution Network Has Been Simulated By Using MATLAB .
Źródło:
Present Problems of Power System Control; 2016, 7; 53-64
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voltage Dependence of Supercapacitor Capacitance
Autorzy:
Szewczyk, A.
Sikula, J.
Sedlakova, V.
Majzner, J.
Sedlak, P.
Kuparowitz, T.
Powiązania:
https://bibliotekanauki.pl/articles/221295.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Electronic Double-Layer Capacitor (EDLC)
charge diffusion
recovery voltage
Opis:
Electronic Double-Layer Capacitors (EDLC), called Supercapacitors (SC), are electronic devices that are capable to store a relatively high amount of energy in a small volume comparing to other types of capacitors. They are composed of an activated carbon layer and electrolyte solution. The charge is stored on electrodes, forming the Helmholtz layer, and in electrolyte. The capacitance of supercapacitor is voltage- dependent. We propose an experimental method, based on monitoring of charging and discharging a supercapacitor, which enables to evaluate the charge in an SC structure as well as the Capacitance-Voltage (C-V) dependence. The measurement setup, method and experimental results of charging/discharging commercially available supercapacitors in various voltage and current conditions are presented. The total charge stored in an SC structure is proportional to the square of voltage at SC electrodes while the charge on electrodes increases linearly with the voltage on SC electrodes. The Helmholtz capacitance increases linearly with the voltage bias while a sublinear increase of total capacitance was found. The voltage on SC increases after the discharge of electrodes due to diffusion of charges from the electrolyte to the electrodes. We have found that the recovery voltage value is linearly proportional to the initial bias voltage value.
Źródło:
Metrology and Measurement Systems; 2016, 23, 3; 403-411
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economical Optimization of Capacitor Placement for Large-Scale Practical Distorted Distribution Network
Autorzy:
Khalil Selim, T. M.
Gorpinich, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/262779.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
capacitor placement
distribution network
losses reduction
selective particle swarm optimization
Opis:
This paper presents the optimization of large-scale practical distorted distribution network for maximum losses reduction and voltage profile improvement based on two-stage methodology for capacitor placement problem. In the first stage, a fuzzy expert system (FES) is used to find the optimal capacitor locations, and in the second stage, a selective particle swarm optimization (SPSO) is used to find the optimal capacitor sizing. The problem is posed as an optimization problem with objective to minimize the total cost of power and energy losses and capacitor banks including constraints for bus voltage and total harmonic distortion (THD) limits. Simulation results show the benefits from optimization and the effect of harmonics on optimal capacitor placement.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2013, 16, 2; 21-29
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 47

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