Wyszukiwarka
Filtry
wszystkich: 1438
-
Katalog
- Publikacje 1035 wyników po odfiltrowaniu
- Czasopisma 4 wyników po odfiltrowaniu
- Osoby 16 wyników po odfiltrowaniu
- Projekty 1 wyników po odfiltrowaniu
- Zespoły Badawcze 1 wyników po odfiltrowaniu
- Aparatura Badawcza 9 wyników po odfiltrowaniu
- Kursy Online 14 wyników po odfiltrowaniu
- Dane Badawcze 358 wyników po odfiltrowaniu
wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: dc voltage balancing
-
Experimental test results of the 150kVA 18-pulse diode rectifier with series active power filter
PublikacjaThe paper presents the control system and selected results of experimental tests of the ac/dc power converter consisting of 18-pulse diode rectifier on the basis of coupled reactors and a serial active power filter. Three configurations of the 150kVA converter were tested experimentally and compared: 18-pulse diode rectifier with and without additional grid reactor and the rectifier integrated with the active power filter. The...
-
Low cost set-up for supercapacitors parameters evaluation
PublikacjaSupercapacitors are capable to store relatively high amount of energy comparing to its mass. Growing number of these devices applications requires development of new testing methods. Standard methods of evaluation of supercapacitor parameters, as cycling voltammetry, CV, galvanostatic cycling with potential limitation, GCPL, impedance measurements, require equipment of high cost...
-
Comparison of Impedance-Source Networks for Two and Multilevel Buck–Boost Inverter Applications
Publikacjampedance-source networks are an increasingly popular solution in power converter applications, especially in single-stage buck-boost power conversion to avoid additional front-end dc-dc power converters. In the survey papers published, no analytical comparisons of different topologies have been described, which makes it difficult to choose the best option. Thus, the aim of this paper is to present a comprehensive analytical comparison...
-
Dynamiczne wyznaczanie parametrów elektrycznego obwodu szeregowego
PublikacjaPo załączeniu napięcia na skutek istnienia inercji prąd w obwodzie zaczyna narastać od wartości zerowej do znamionowej. W tym czasie narastają spadki napięć na rezystancjach (impedancjach obwodu) do chwili spełnienia prawa Kirchhoffa. Można utworzyć układ ze sprzężeniem zwrotnym (układ regulacji stałowartościowej bądź nadążnej), który poszukuje parametrów obwodu spełniających prawa Kirchhoffa – elementy nie muszą być liniowe. W...
-
Control Strategy of a Five-Phase Induction Machine Supplied by the Current Source Inverter With the Third Harmonic Injection
PublikacjaIn the five-phase induction machine (IM), it is possible to better use the electromagnetic circuit than in the three-phase IM. This requires the use of an adequate converter system which will be supplied by an induction machine. The electric drive system described, in this article, includes the five-phase induction machine supplied by the current source inverter (CSI). The proposed novelty—not presented previously—is the control...
-
Highly stable CsFAPbIBr perovskite solar cells with dominant bulk recombination at real operating temperatures
PublikacjaMixed-cation mixed-halide perovskite solar cells have been characterized in DC at different temperatures (from −20 °C up to 50 °C) and the time evolution of the device efficiency has been assessed using different degradation protocols (indoors and outdoors). The completely planar p–i–n structure is ITO/CuNiOx/PTAA/CsFAPbIBr/PCBM/PEI/Ag. Pristine current–voltage characteristics barely show hysteresis, at any temperature. Open circuit...
-
Conducted emi identification in power electronic converters : modeling of EMI generation and propagation using circuit simulation and wiener filtering methods.
PublikacjaThis work presents the circuit simulations and the conventional signal processing technique (Wiener filtering) in order to reconstruct conducted ElectroMagnetic Interferences (EMI), generated and propagated in power electronics converters. In the simulation study, the most accurate presently available models of components of circuit have been used and improved. The proposed Wiener filtering method allows to identifying the transfer...
-
IMPACT OF DIRECT CURRENT ON NITRIFYING BIOMASS
PublikacjaEffects of short term exposure of nitrifying biomass to direct current were studied. DC was applied to mixed liquor from municipal BNR plant using graphite electrodes in no substrate limiting conditions. Both, ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) populations were affected by the current, however in opposite ways. The AOB population activity was inhibited by applied voltage. Activity decrease was...
-
Nonlinear and linear impedance of bismuth vanadate ceramics and its relation to structural properties
PublikacjaThe nonlinear and linear electrical properties, topography, and microstructure of bismuth-vanadate ceramics, were studied. The structurewas observed with the use of X-ray diffraction (XRD), scanning electronmicroscopy (SEM), atomic force microscopy (AFM) and confocal microscopy methods. The obtained results showed that ceramic is porous. Two phase transitionswere determinedwith the use of DSC measurements. The linear and nonlinear ac...
-
Application of Barycentric Coordinates in Space Vector PWM Computations
PublikacjaThis paper proposes the use of barycentric coordinates in the development and implementationof space-vector pulse-width modulation (SVPWM) methods, especially for inverters with deformed space-vector diagrams. The proposed approach is capable of explicit calculation of vector duty cycles, independentof whether they assume ideal positions or are displaced due to the DC-link voltage imbalance. The use ofbarycentric coordinates also...
-
Collection Efficiency in Narrow Electrostatic Precipitators with a Longitudinal or Transverse Wire Electrode
PublikacjaRecently narrow electrostatic precipitators (ESPs) have become a subject of interest because of their possible application in diesel engine exhaust systems. In this work, results of particle collection efficiency measurements in narrow electrostatic precipitators for negative and positive dc voltage polarity are presented. The ESP usedin this work was a parallelepiped equipped with wire discharge electrode and two collecting plate-electrodes....
-
Simulation Studies of Control Systems for Doubly Fed Induction Generator Supplied by the Current Source Converter
PublikacjaThe control system for a Doubly Fed Induction Generator (DFIG) supplied by a grid-connected Current Source Converter (CSC) is presented in this paper. Nonlinear transformation of DFIG model to the multi-scalar form is proposed. The nonlinear control strategy of active and reactive power of DFIG is realized by feedback linearization. In the proposed control scheme, the DFIG model and CSI parameters are included. Two Proportional-Integral...
-
Evolution of electrohydrodynamic flow of sduspended particles in a needle-to-plate negative DC corona discharge in air
PublikacjaCorona discharges are used for collecting dust in electrostatic precipitators (ESPs). The dust collection is mainlyrealized by the electric forces which move the ionized dust particles to the collecting electrodes. However, the presence of coronadischarge in the space between the charging and collecting electrodes in ESPs causes also the so-called ionic wind which set the gasmolecules and dust...
-
Fault Loop Impedance Measurement in Circuits Fed by UPS and Principle of Safety Protection
PublikacjaThis paper indicates a significant problem of uncertainty of fault loop impedance (FLI) measurement in circuits powered from uninterruptible power supply (UPS) (double-conversion AC-DC-AC). The correctly determined value of this impedance, related to the short-circuit current disconnection time and to the reference value, is one of the most important elements that determines the approval of an electrical installation and its receivers...
-
Metamaterial-Based Sub-Microwave Electromagnetic Field Energy Harvesting System
PublikacjaThis paper presents the comprehensive analysis of the sub-microwave, radio frequency band resonant metastructures’ electromagnetic properties with a particular emphasis on the possibility of their application in energy harvesting systems. Selected structures based on representative topologies of metamaterials have been implemented in the simulation environment. The models have been analyzed and their substitute average electromagnetic...
-
Electrohydrodynamic flow patterns and collection efficiency in narrow wire-cylinder type electrostatic precipitator
PublikacjaRecently, narrow electrostatic precipitators (ESPs) have become a subject of interest because of their possible application for the cleaning of the exhaust gases emitted by diesel engines. Diesel engines emit fine particles, which are harmful to human and animal health. There are several methods for decrease particulate emission from a diesel engines, but up to now, these methods are not enough effective or very expensive. Therefore,...
-
AutoCAD - DC Edukacja
Kursy OnlineAutoCAD DC Edukacja
-
Detekcja i lokalizacja nieprzewodzenia tranzystorów falownika napięcia na podstawie analizy prądu obciążenia
PublikacjaPrzedstawiono nową metodę detekcji i lokalizacji nieprzewodzenia tranzystorów w falownikach napięcia zasilających silniki indukcyjne małej mocy. Metoda bazuje na monitorowaniu wartości dwóch sygnałów dia-gnostycznych. Pierwszy z nich, wskaźnik braku przepływu prądu, wykorzystano w celu detekcji uszkodzeń. Drugi, stosunek wartości średniej prądu do wartości średniej bezwzględnej, zawiera informacje umożliwiające lokalizację uszkodzonych...
-
Multiple output CMOS current amplifier
PublikacjaIn this paper the multiple output current amplifier basic cell is proposed. The triple output current mirror and current follower circuit are described in detail. The cell consists of a split nMOS differential pair and accompanying biasing current sources. It is suitable for low voltage operation and exhibits highly linear DC response. Through cell devices scaling, not only unity, but also any current gains are achievable. As...
-
Current harmonic controller in multiple reference frames for series active power filter integrated with 18-pulse diode rectifier
PublikacjaThe paper presents the control system and selected results of experimental tests of the AC/DC power converter consisting of an 18-pulse diode rectifier based on coupled reactors and a serial active power filter. Proportional integral controllers with decoupling components are implemented in multiple reference frames for selective line current harmonic suppression. The regulator is provided with a backtracking anti-windup mechanism...
-
Switching Regulation in the Control of 5-Phase Permanent Magnet Synchronous Motor Fed by 3×5 Direct Matrix Converter
PublikacjaMatrix converter is an AC-AC direct power converter comprising of an array of bi- directional switches. It does not require an intermediate DC-link and allows sinusoidal output waveforms with varying amplitudes and frequencies. The configuration of these bi- directional switches decides the number of inputs and outputs...
-
Low-frequency noise in Au-decorated graphene–Si Schottky barrier diode at selected ambient gases
PublikacjaWe report results of the current–voltage characteristics and low-frequency noise in Au nanoparticle (AuNP)-decorated graphene–Si Schottky barrier diodes. Measurements were conducted in ambient air with addition of either of two organic vapors, tetrahydrofuran [(CH2)4O; THF] and chloroform (CHCl3), as also during yellow light illumination (592nm), close to the measured particle plasmon polariton frequency of the Au nanoparticle...
-
Assessment of organic coating degradation via local impedance imaging
PublikacjaThe paper presents a new approach to organic coating condition evaluation at micrometer scale using localized impedance measurements. It is based on atomic force microscopy (AFM) in contact mode. Impedance is measured between conductive AFM tip and metal substrate covered with organic coating. A single-frequency voltage perturbation signal is applied between the electrodes and current response signal is registered. As the tip is...
-
Analysis of balancing of four stroke V6 engines
PublikacjaAnalysis of balance of V6 engines with a common-pin crankshaft depending on a cylinder bank angle and the crank radius to connecting rod length ratios , based on the relations derived, is presented in the paper. The bank angles providing the lowest moment of inertia forces in reciprocating motion, for selected values, were determined. The position of the plane of the main counterweights in order to maximum balance of the moment...
-
Optimal state feedback controller for balancing cube
PublikacjaIn this paper, a nonlinear balancing cube system is considered, the concept for which is based on an inverted pendulum. The main purpose of this work was the modelling and construction of a balancing cube with the synthesis of the control system. The control objectives included swing-up and stabilization of the cube on its vertex at an unstable equilibrium. Execution of the intended purpose required, first, deriving a cognitive...
-
Natural convection in symmetrically heated vertical channels
PublikacjaThe study describes natural convection through a vertical channel, open on four sides and bound by two isothermal walls. Both balancing and infrared experimental investigations were performed in air (Pr = 0.71) to estimate the impact of channel width s and wall-to-ambient temperature difference (tw - t∞) on natural convective heat transfer, the formation of air flow patterns and the rate of flow pattern formation. The study was...
-
The conducted EMI in DC-DC converters
PublikacjaThis book presents the phenomena of conducted electromagnetic interference (EMI) generation in DC-DC converters. The measurement and simulation are used to analyze the impact of the most important parameters on the character, level and propagation path of interference. In this book, the analysis of the interference generation and propagation is presented on the example of three basic converters. The wide banded behavior of all...
-
Comparative analysis of balancing of V6 engines with common- and split-pin crankshafts
PublikacjaAn analysis of balancing of V6 engines equipped with split-pin crankshafts with any cylinder bank angle based on the mathematical relations derived in the paper was carried out. A comparison of the quality of their balancing with engines equipped with common-pin crankshafts was also carried out. The bank angle ranges beneficial for balancing of moments of inertia forces in reciprocating motion were determined. A mathematical relation...
-
Prediction of ringing frequencies in DC-DC boost converter
PublikacjaIn the paper ringing phenomena in a DC-DC boost converter is presented. The ringing frequency is calculated using an analytical formula. The necessary wide band models of MOSFET transistor, passive and parasitics are described. The calculation results are verified in simulation and laboratory tests.
-
Badania symulacyjne wysokonapięciowej przetwornicy DC/DC
PublikacjaW artykule zaprezentowano wyniki badań symulacyjnych przekształtnika energoelektronicznego typu DC/DC działającego w układzie niepełnego mostka z transformatorem izolacyjnym pracującym przy dużej częstotliwości. Badania symulacyjne wykonano posługując się pakietem Matlab-Simulink z biblioteką SimPowerSystems. Omówiono problemy zastosowania wysokonapięciowych tranzystorów z izolowaną bramką do konstrukcji przekształtników wysokiego...
-
Potential of silicon carbide MOSFETs in the DC/DC converters for future HVDC offshore wind farms
Publikacja -
Przetwornica dc-dc z miękką komutacją tranzystorów
PublikacjaW artykule zaprezentowano wyniki badań eksperymentalnych przetwornicy DC-DC o mocy 20[kW], w której ograniczenie komutacyjnych strat mocy zapewniono poprzez wykorzystanie dławika z odczepem oraz dodatkowego obwodu rezonansowego. Przedstawiono wyniki badań eksperymentalnych wpływu wartości parametrów poszczególnych elementów układu przetwornicy na zachowanie warunków miękkiej komutacji.
-
Przetwornica dc-dc z miękką komutacją tranzystorów
PublikacjaW artykule zaprezentowano wyniki badań eksperymentalnych przetwornicy DC-DC o mocy 20[kW], w której ograniczenie komutacyjnych strat mocy zapewniono poprzez wykorzystanie dławika z odczepem oraz dodatkowego obwodu rezonansowego. Przedstawiono wyniki badań eksperymentalnych wpływu wartości parametrów poszczególnych elementów układu przetwornicy na zachowanie warunków miękkiej komutacji.
-
Balancing energy processes in turbine engines
PublikacjaThe article discusses the issue of balancing energy processes in turbine engines in operation in aeronautic and PDULQHSURSXOVLRQV\VWHPVZLWKWKHDLPWRDQDO\VHDQGHYDOXDWH EDVLFRSHUDWLQJSDUDPHWHUV7KH¿UVWSDUWSUHVHQWV the problem of enormous amounts of energy needed for driving fans and compressors of the largest contemporary turbofan engines commonly used in long-distance aviation. The amounts of the transmitted power and the effect RIÀRZSDUDPHWHUVDQGFRQVWUXFWLRQDOSURSHUWLHVRIWKHHQJLQHV RQWKHLUSHUIRUPDQFHDQGUHDOHI¿FLHQF\DUH evaluated....
-
On the use of a charge balancing method for low energy measurements
PublikacjaThe paper presents the method for the estimation of the energy consumption of the low-power microcontroller-based devices. Due to high dynamics of the changes of the supply current of the tested devices during the operational cycle, the consumed energy estimation is not easy. In order to avoid disadvantages of known methods, the charge balancing method was employed similarly like in some types of A/D converters.
-
DC-2023
Kursy OnlineII st (ang), sem. AiR
-
DC-2022
Kursy OnlineII st (ang), sem. AiR
-
DC-2024
Kursy OnlineII st (ang), sem. AiR
-
Modeling of conducted emission of dc-dc switch-mode converter
PublikacjaW publikacji zaprezentowano sposób modelowania i wyznaczania emisji przewodzonej zaburzeń elektromagnetycznych w przekształtnikach energoelektronicznych. Na przykładzie przekształtnika DC-DC, zostały dobrane odpowiednie narzędzia CAD do szerokopasmowego modelowania i symulacji przekształtnika energoelektronicznego. Otrzymane rezultaty zostały eksperymentalnie potwierdzone i porównane zarówno w dziedzinie czasu jak i częstotliwości...
-
Voltage Conditions in Low Voltage Grid with Connected Mictogeneration
PublikacjaThe introduction of distributed generation into a low voltage grid may cause voltage problems in it. The paper discusses the effect of microgeneration on voltage levels in a low voltage grid. A real low voltage grid of considerable length was selected for the analysis. The grid primarily supplies residential buildings in a rural area. Results of tests that consider potential measures which could be applied in this grid to improve...
-
Wielotransformatorowy quasi-rezonansowy przekształtnik DC-DC
PublikacjaW rozprawie przedstawiono oryginalną koncepcję wielotransformatorowego przekształtnika dwutaktowego dc/dc z wieloma wyjściami o sterowaniu quasi-rezonansowym. Przeprowadzono analizę modelu obwodowego przekształtnika w układzie n-transformatorowym. Na podstawie bilansu energetycznego określono wpływ indukcyjności rozproszenia transformatorów i współczynnika asymetrii obciążenia na uchyb regulacji skrośnej napięć wyjściowych. W celu...
-
Dc Leakage Current in Isolated Grid-Connected dc Nanogrid - Origins and Elimination Methods
PublikacjaThe LV dc system is a relatively new trend in the distribution sector, which seems to grow widely in the near future due to its promising advantages. In this context, LV dc protection and grounding are challenging issues. Although the galvanically isolated connection mode of dc nanogrid to the ac grid has high reliability, the leakage current can still be injected into the ac grid through the interwinding capacitors and the insulation...
-
Selected aspects of the operation of Dual Active Bridge DC/DC converters
PublikacjaThis review paper discusses the concept of a bidirectional dual active bridge (DAB) DC/DC converter. Practical applications and control methods are explored, and various types of DAB converters are introduced and characterized. Aspects of operation are discussed, and enriched by the results of theoretical analyses, simulations, and experimental measurements of the original authors’ work.
-
Przekształtnik SiC DC-DC z transformatorem macierzowym do pokładowych ładowarek baterii akumulatorów taboru 3kV DC
PublikacjaBaterie akumulatorów pojazdów trakcyjnych zapewniają zasilanie krytycznych systemów, takich jak sterowanie i oświetlenie. Zgodnie z wymaganiami przemysłu kolejowego, pokładowa ładowarka baterii akumulatorów powinna być urządzeniem kompaktowym, wysokosprawnym, a jednocześnie wysoce niezawodnym. W referacie, do pokładowego ładowania akumulatorów pociągu zaproponowano kompaktowy przekształtnik SiC DC-DC z transformatorem macierzowym...
-
Przekształtnik SiC DC-DC z transformatorem macierzowym do pokładowych ładowarek baterii akumulatorów taboru 3kV DC
PublikacjaBaterie akumulatorów pojazdów trakcyjnych zapewniają zasilanie krytycznych systemów, takich jak sterowanie i oświetlenie. Zgodnie z wymaganiami przemysłu kolejowego, pokładowa ładowarka baterii akumulatorów powinna być urządzeniem kompaktowym, wysokosprawnym, a jednocześnie wysoce niezawodnym. W referacie, do pokładowego ładowania akumulatorów pociągu zaproponowano kompaktowy przekształtnik SiC DC-DC z transformatorem macierzowym...
-
Wideband Modeling of DC-DC Buck Converter with GaN Transistors
PublikacjaThe general wideband modeling method of the power converter is presented on the example of DC-DC buck converter with GaN High Electron Mobility Transistors (HEMT). The models of all basic and parasitic components are briefly described. The two methods of Printed Circuit Board (PCB) layout parameter extraction are presented. The results of simulation in Saber@Sketch simulation software and measurements are compared. Next, the model...
-
Analysis of energy efficiency of suburban railway transport network
PublikacjaRising numbers of agglomeration residents cause increased need for people movement on daily basis. Because of congestion of local roads, air pollution and limited parking space, providing mass transit based on electric traction is reasonable. While the electric rail vehicles are considered highly efficient in themselves, they need to be analyzed as a part of a transport network, because energy consumption depends on operating conditions...
-
Optimisation of ZVZCS DC/DC converter with tapped inductor.
PublikacjaW artykule zaprezentowano możliwości wykorzystania dławika z odczepem oraz obwodu LC w celu uzyskania warunków miękkiej komutacji kluczy energoelektronicznych w przetwornicy DC-DC.Na podstawie modelu matematycznego zbadany został wpływ wartości elementów na zachowanie miękkiej komutacji.Przedstawiono wyniki badań symulacyjnych i eksperymentalnych.
-
Modelowanie układu przetwornicy rezonansowej dc-dc z miękką komutacją tranzystorów.
PublikacjaW referacie zaprezentowano model matematyczny przetwornicy DC-DC, który umożliwia przeprowadzenie badań symulacyjnych układu przetwornicy oraz dobór parametrów głównych jej elementów.
-
A Development of a Capacitive Voltage Divider for High Voltage Measurement as Part of a Combined Current and Voltage Sensor
PublikacjaThis article deals with the development of capacitive voltage divider for high voltage measurements and presents a method of analysis and optimization of its parameters. This divider is a part of a combined voltage and current sensor for measurements in high voltage power networks. The sensor allows continuous monitoring of the network distribution status and performs a quick diagnosis and location of possible network failures....