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Wyświetlanie 1-15 z 31
Tytuł:
Technical and Economical Evaluation of Proton Exchange Merobrane (PEM) Fuel Cell for Commercial Applications
Autorzy:
Katyara, S.
Iżykowski, J
Staszewski, Ł
Shaikh, F.
Powiązania:
https://bibliotekanauki.pl/articles/410535.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Proton Exchange Membrane
PEM
Fuel Cell
DC/DC boost converter
Distributed Generation
DG
polarization curve
efficiency
Opis:
The green energy sources are the utmost needs of today’s world where the reserves of fossil fuel are depleting day by day. The Distributed Generation (DG) has become integral part of power system at commercial level. The most efficient among all DGs and Renewable Energy Sources (RES) is the Fuel Cell (FC) power generation. The fuel cell invariably converts chemical energy directly into electricity. The Fuel cells have normally 60 to 70% efficiency at working conditions. The polarization curve of fuel cell plays important role in improving its efficiency. This research presents the mathematical and Simulink modeling 6 kW, 45 Vdc of Proton Exchange Membrane (PEM) fuel cell. The input thermodynamic parameters of fuel cell are varied and their effects on the output electrical variable are observed. The DC/DC boost converter is used to step up the voltage of fuel cell to 100 Vdc at commercial usable level. A new mathematical equation is presented to improve the efficiency of fuel. The mathematical results are then varied through Simulink results.
Źródło:
Present Problems of Power System Control; 2017, 8; 41-49
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of an open-switch fault detection algorithm for a three-phase interleaved DC–DC boost converter in a photovoltaic system
Autorzy:
Boudjellal, Bilal
Benslimane, Tara
Powiązania:
https://bibliotekanauki.pl/articles/27309944.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
DC–DC converters
fault diagnosis
interleaved boost converter
open switch fault
photovoltaic (PV) system
Opis:
This paper presents a novel fault detection algorithm for a three-phase interleaved DC–DC boost converter integrated in a photovoltaic system. Interleaved DC–DC converters have been used widely due to their advantages in terms of efficiency, ripple reductions, modularity and small filter components. The fault detection algorithm depends on the input current waveform as a fault indicator and does not require any additional sensors in the system. To guarantee service continuity, a fault tolerant topology is achieved by connecting a redundant switch to the interleaved converter. The proposed fault detection algorithm is validated under different scenarios by the obtained results.
Źródło:
Archives of Electrical Engineering; 2023, 72, 3; 661--676
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small-signal input characteristics of step-down and step-up converters in various conduction modes
Autorzy:
Janke, W.
Walczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/200514.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pulse converter
BUCK
BOOST
small-signal models
input characteristics
przetwornica impulsowa
charakterystyki wejściowe
Opis:
Small-signal input characteristics of BUCK and BOOST DC-DC power converters in continuous conduction and discontinuous conduction mode have been presented. Special attention is paid to characteristics in discontinuous conduction mode. The input characteristics are derived from the general form of averaged models of converters. The frequency dependence of input admittance and other input characteristics has been observed in a relatively low-frequency range. The analytical formulas derived in the paper are illustrated by numerical calculations and verified by experiments with a laboratory model of BOOST converter. A satisfying level of conformity of calculations and measurements has been obtained.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 265-270
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single sensor based photovoltaic maximum power point tracking technique for solar water pumping system
Autorzy:
Daoud, A.
Midoun, A.
Powiązania:
https://bibliotekanauki.pl/articles/262763.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
MPPT
boost converter
rmicrocontroller
DC motor-pump
flow rate
Opis:
The development of photovoltaic (PV) panels has made solar-powered pumps a reality. The pump drivers are usually direct-current (DC) motors which are fed by power electronic converters with maximum power point tracking (MPPT) to extract the whole energy that the PV panels can generate depending on the environmental conditions including irradiation and temperature. The implementation of MPPT algorithm essentially involves sensing both an input current and an input voltage. Understandably, such realization is expensive. In this paper, a solar PV water pumping system based on DC to DC converter as MPPT module is considered. The system consists of a PV array, a DC to DC boost converter and the DC motor coupled to a centrifugal pump. A proposed method is employed to seek the maximum power point using the flow rate obtained from a single sensor. A comparison with conventional hill climbing technique is included in experimental results to prove feasibility of the proposed method.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 2; 69-72
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation studies of partial parallel isolated DC/DC boost converter
Autorzy:
Krupa, A.
Powiązania:
https://bibliotekanauki.pl/articles/377506.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
boost converter
DC/DC boost converter
energy source
storage device
PSpice model
Opis:
The renewable energy sources or energy storage devices deliver output voltage at the range of around 12 VDC to 48 VDC. In order to obtain at least 350 VDC needed for direct to alternating current conversion the DC/DC power converter should demonstrate significant voltage gain and power conversion efficiency as high as possible. To obtain such level of output voltage at low input voltages transistors of the boost converter must operate with high currents. High efficiency and high voltage gain can be achieved with parallel combination of two or more isolated step-up converters. The converters operate synchronously and in phase, using the same control signals. Balancing transformers are used to ensure the synchronization and equal distribution of current between the power levels. They provide equal distribution of significant input current to a number of smaller current loops. This feature alongside with the use of power MOSFETs with low channel resistance and silicon carbide (SiC) Schottky diodes will reduce losses within the converter and increase the efficiency of entire energy conversion system. This paper presents PSpice simulation results of partial parallel isolated DC/DC boost converter with voltage doubler. In presented circuit high voltage gain and high conversion efficiency were achieved.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 76; 15-21
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation studies of half-bridge isolated DC/DC boost converter
Autorzy:
Krupa, A.
Powiązania:
https://bibliotekanauki.pl/articles/376124.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Pspice simulation
boost converter
high voltage step-up
high efficiency
Opis:
In order to utilize energy from low voltage power source it is necessary to use isolated DC/DC boost converter which will provide desirable input voltage step-up. To obtain a high voltage gain it is necessary to apply a magnetic device with the relevant turns ratio to the converter structure. This can be coupled inductor or transformer. The great advantage of the transformer is galvanic isolation between the subsequent power levels. Unfortunately, the high values of voltage gain is accompanied by significant currents on the primary transformer side. Large DC input currents cause an increase in power losses as the transistor conduction losses are proportional to square of current. The solution to this problem would be to divide a large input current into smaller currents through applying balancing transformers in converter structure. The input current in one stage exactly matches the current in the parallel branch, therefore there is no need for additional control to guarantee current balancing between power stages. This technique, together with the use of transistors with a small drain-source resistance and output SiC (silicon carbide) Schottky diodes enables converter to achieve necessary output voltage. This paper presents PSpice simulation results and mathematical analysis of half-bridge isolated DC/DC boost converter. In presented circuit high voltage gain and high conversion efficiency were achieved.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 93-100
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust Back-stepping Based Higher Order Sliding Mode Control of Non-Inverted Buck-Boost Converter for a Photovoltaic System
Autorzy:
Ullah, Shaukat
Powiązania:
https://bibliotekanauki.pl/articles/1955975.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
MPPT
buck-boost converter
non-linear control
backstepping
higher order sliding
photovoltaic PV
Opis:
Photovoltaic (PV) system generates renewable energy from sunlight, which has low efficiency due to the variance in nature of temperature and irradiance in a fast changing environment condition. Different researchers have proposed different maximum power point tracking MPPT techniques to improve the efficiency. However, still there are many open issues. Thus, to address this, a non-linear back-stepping-based higher order sliding mode controller (BHOSMC) is proposed to harvest maximum power from PV system. The PV module and load is interfaced by a non-inverted buck-boost converter (NIBBC). A linear interpolation method is used for voltage generation and Lyapunov stability is used to verify the control system equation. MATLAB/Simulink software is used for testing the proposed controller performance. The experimental result verified that the proposed BHOSMC is robust, accurate and fast tracking, faultless and less chattering as compared to perturb and observe (P&O), back-stepping control (BSC) and back-stepping-based sliding mode control under rapidly varying meteorological condition.
Źródło:
Power Electronics and Drives; 2021, 6, 41; 113-127
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd programów komputerowych dedykowanych projektowaniu układów elektronicznych. Charakterystyka środowiska GeckoCIRCUITS
Review of Computer Programs Dedicated to the Design of Electronic Systems. Characteristics of the GeckoCIRCUITS Environment
Autorzy:
Stasiak, W.
Czarnowski, I.
Powiązania:
https://bibliotekanauki.pl/articles/947647.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Tematy:
projektowanie wspomagane komputerowo
GeckoCIRCUITS
projektowanie układów elektronicznych
przekształtnik boost
computer aided design
design of electronic circuits
boost converter
Opis:
Rozwój technologii wytwarzania układów elektronicznych, a także coraz szerszy zakres ich zastosowań, prowadzi do zapotrzebowania na rozwiązania wspomagające ich projektowanie. W artykule dokonano przeglądu wybranych rozwiązań dedykowanych projektowaniu układów elektronicznych. Skoncentrowano się na rozwiązaniach opartych na projektowaniu komputerowym, porównując wybrane środowiska programowe. W szczególności uwagę poświęcono środowisku GeckoCIRCUITS, które omówiono na przykładzie projektu układu przekształtnika podwyższającego napięcie (boost converter).
The development of electronics manufacturing technologies, as well as increasingly broad range of their applications, leads to an increase in the demand for solutions that support their design process. The article reviews selected solutions dedicated to the design of electronic circuits and focuses on computed-based solutions, comparing the selected software environments. Particular attention has been paid to the GeckoCIRCUITS environment, which has been discussed basing on example of an electronic boost converter circuit design.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Gdyni; 2018, 103; 137-150
1644-1818
2451-2486
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Gdyni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance and stability analysis of series-cascaded, high-gain, interleaved boost converter for photovoltaic applications
Autorzy:
Prasanna Kumar, C.
Venugopal, N.
Powiązania:
https://bibliotekanauki.pl/articles/1193536.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
series cascade
interleaved boost converter
high gain
stability
fast Fourier transform
Opis:
Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 85-97
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the AC/HF/DC converter with power factor correction
Autorzy:
Bogdan, A.
Powiązania:
https://bibliotekanauki.pl/articles/141404.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
korekcja współczynnika mocy
obwód rezonansowy
transformator wysokiej częstotliwości
przekształtnik podwyższający napięcie
power factor correction
resonant circuit
high frequency transformer
boost converter
Opis:
In this paper, the power factor correction system consisted of: bridge converter, parallel resonant circuit, high frequency transformer, diode rectifier and LFCF filter is presented. This system is controlled by a pulse density modulation method and the principle of its operation is based on the boost technique. The modeling approach is illustrated by an example using AC/HF/DC converter. Verification of the derived model is provided, which demonstrated the validity of the proposed approach.
Źródło:
Archives of Electrical Engineering; 2010, 59, 3-4; 141-152
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of boost DC/DC pulse converter with regard of conduction power losses for continuous current mode
Modelowanie przetwornicy DC/DC podwyższającej napięcie z uwzględnieniem strat mocy przewodzenia przy ciągłym prądzie łącznika diodowego
Autorzy:
Pawlak, M.
Powiązania:
https://bibliotekanauki.pl/articles/402456.pdf
Data publikacji:
2012
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
switching mode power converter
boost converter
energy efficiency
voltage gain
tryb przełączania przetwornicy
konwerter mocy
efektywność energetyczna
wzmocnienie napięcia
Opis:
Boost DC/DC pulse converter structure with regard to conduction power losses for Continuous Current Mode has been analyzed in the paper. Simplified model of converter which takes into account the nonlinearity of the static characteristic switches was usedfor theoretical analysis. The models of the transistor and diode whose static characteristic are modeled as in series connection ideal electronic switch, the constant voltage source and dynamic effective resistance have been used. The dynamic losses of powers occurring in the switching process of electronic switches were not captured in the work. The proposed model of the converter has the use in the case, when it works at low switching frequencies, when the losses of switching are considerably smaller than the losses of conductivity. This land of model is useful, particularly in the case of the converter supplied the low voltage, when the voltages loss on electronic switches is significant. Analysis was performed for Continuous Current Mode (CCM) with voltage step up. Results of theoretical analysis have been presented and were verified by simulation. TCAD circuit simulator was used for simulation. Simulations confirm results of theoretical analysis.
Źródło:
Structure and Environment; 2012, 4, 2; 27-35
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended T-type inverter
Autorzy:
Rąbkowski, J.
Kopacz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1193496.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
multilevel inverter
T-type inverter
boost converter
silicon carbide
Opis:
This paper presents a new concept for a power electronic converter – the extended T-type (eT) inverter, which is a combination of a three-phase inverter and a three-level direct current (dc)/dc converter. The novel converter shows better performance than a comparable system composed of two converters: a T-type inverter and a boost converter. At first, the three-level dc/dc converter is able to boost the input voltage but also affects the neutral point potential. The operation principles of the eT inverter are explained and a simulation study of the SiC-based 6 kVA system is presented in this paper. Presented results show a serious reduction of the DC-link capacitors and the input inductor. Furthermore, suitable SiC power semiconductor devices are selected and power losses are estimated using Saber software in reference to a comparative T-type inverter. According to the simulations, the 50 kHz/6 kVA inverter feed from the low voltage (250 V) shows <2.5% of power losses in the suggested SiC metal oxide–semiconductor field-effect transistors (MOSFETs) and Schottky diodes. Finally, a 6 kVA laboratory model was designed, built and tested. Conducted measurements show that despite low capacitance (2 × 30 μF/450 V), the neutral point potential is balanced, and the observed efficiency of the inverter is around 96%.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 55-64
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equivalent circuits for averaged description of DC-DC switch-mode power converters based on separation of variables approach
Autorzy:
Janke, W.
Powiązania:
https://bibliotekanauki.pl/articles/200524.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switch-mode power converter
BUCK
BOOST
averaged models
equivalent circuits
Opis:
Large-signal and small-signal averaged models of basic switch-mode DC-DC power converters: BUCK (step-down) and BOOST (step-up) are presented. Models are derived with the separation of variables approach and have the form of equivalent circuits, suitable for a circuit simulation. Apart from equivalent circuits, small-signal transmittances of converters for CCM and DCM modes are discussed. Parasitic resistances of all components of converters are taken into account. A few examples of simulations and measurement results of selected converter characteristics are also presented. It is shown, that neglecting parasitic resistances (often met in works of other authors) may lead to serious errors in an averaged description of converters.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 711-723
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of energy-efficient IBC with IGBT module for photovoltaic applications
Autorzy:
Kumar, C. Prasanna
Rao, Anand
Powiązania:
https://bibliotekanauki.pl/articles/1193903.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
interleaved boost converter
efficiency
stability
power converter
switching frequency
Opis:
The proposed study is improvised value-engineered modifications for the basic interleaved boost converter (IBC) by including relevant modifications in circuits, which is expected for a better performance in switching with reduction in losses. The newly modified IBC circuit with insulated gate bipolar transistor (IGBT) along with converter has been experimented by simulations and the results are tabulated to modified IBC with metal oxide silicon field effect transistors. Further experimental analysis and validations of the proposed simulation with hardware developed adopting model SKM195GB066D consisting of IGBTs is presented. This study further enhances and summarises the optimum utilisation and the performance of IBC with the proposed IGBT modules that synchronises power diode. Enhancing the simulation outcomes, the hardware is proposed and developed to be tested for a load up to 1.5 kW with the evaluation of key parameters such as efficiency of the converter.
Źródło:
Power Electronics and Drives; 2020, 5, 40; 73-81
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DC-DC boost-flyback converter functioning as input stage for one phase low power grid-connected inwerter
Autorzy:
Kawa, A.
Penczek, A.
Piróg, S.
Powiązania:
https://bibliotekanauki.pl/articles/141671.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC-DC high-step-up converter
boost converters
microinverters
renewable energy
Opis:
The paper treats about main problems of one phase DC-AC microinverters that allow single solar cell to be joined with the grid. One of the issues is to achieve high voltage gain with high efficiency in DC circuit, which is necessary for proper operation of inverter. The operating principles, results of practical implementation and investigations on boost-flyback converter, which meets mentioned demands, are presented. (high step-up DC-DC boost-flyback converter for single phase grid microinverter).
Źródło:
Archives of Electrical Engineering; 2014, 63, 3; 393-407
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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