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Wyniki wyszukiwania dla: POWER HOLDERS
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A simple modular active power electronic transformer
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Analysis of reliability of redundant ship power plants
PublikacjaW referacie przedstawiono możliwości wykorzystania teorii procesów semimarkowskich do określania charakterystyk niezawodnościowych złożonych układów napędowych o zadanym stopniu redundancji. Na przykładzie wybranego układu zaproponowano model niezawodnościowy w formie procesu stochastycznego dyskretnego w stanach i ciągłego w czasie. W oparciu o rozkład graniczny procesu wskazano na praktyczne aspekty wykorzystania uzyskanych w...
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Destruction assessment of wind power plastics blade
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Modelling of Nuclear Power Plant Steam Turbine
PublikacjaThe paper describes the approach to a Nuclear Power Plant steam turbine modelling which would enable on-line optimal process control (model based) and diagnosis over wide range of operating conditions caused by changing power demand. Presented model is static, multivariable and nonlinear. Such model enables analyzing the heat cogeneration aspects. Developed model is validated and verified by using archive data gained from researches...
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Isolation and restoration policies against power collapse.
PublikacjaPrzedstawiono zasady obrony systemów elektroenergetycznych przed tzw. blackout´em. Omówiono wielkości kryterialnych tych systemów, możliwości predykcji stanów zagrożeniowych oraz automatyki działające on line w celu zapobieżenia rozprzestrzeniania się zakłóceń i awarii w systemach elektroenergetycznych.
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Modelling EMI choke for the power electronics application
PublikacjaPrzedstawiono wyniki przeprowadzonych badań symulacyjnych i eksperymentalnych dotyczących propagacji zakłóceń elektromagnetycznych przewodzonych w dławikach przeciwzakłóceniowych stosowanych w przekształtnikach energoelektronicznych. Zaproponowany model obwodowy dławika pozwala na analizę symulacyjną właściwości w zakresie częstotliwości zaburzeń elektromagnetycznych przewodzonych. Model uwzględnia zjawiska związane z pojemnościami...
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Environmental safety of a seagoing ship power plant.
PublikacjaPrzedstawiono probabilistyczne podejście do oceny bezpieczeństwa środowiskowego siłowni statku. Zaproponowano kryterium oceny bezpieczeństwa środowiskowego siłowni statku.
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Better understanding EMI generation of power converters
PublikacjaPrzedstawiono metodę przewidywania poziomu zaburzeń w układzie podwyższającym napięcie w oparciu o metodę filtracji Wienera. Pozwoliło to na określenie odpowiedzi impulsowej pomiędzy przyczyną zaburzenia (zmianą napięcia na elementach półprzewdonikowych) a zaburzeniem. Metodę zwerifikowano przy użyciu danych z symulacji oraz pomiarów w rzeczywistym obiekcie
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Implementation of power transformer controlled switching algorithm
PublikacjaThe article presents two new algorithms of controlled switching the power transformer. The main aim of the paper is to obtain formulas that determine the moments of closing of the circuit breaker poles. The study contains projects of control systems for both algorithms. Mathematical formulas for the time instants of the breaker poles closing were developed on the basis of electric circuit theory and magnetic circuit theory. The...
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THE PHASE SHIFTERS INFLUENCE ON THE POWER SYSTEM STABILITY
PublikacjaThe paper presents the effect of phase shifters as FACTS devices on the possibility of improving the angle stability. Presented results obtained by the dynamic simulation performed on the mathematical model of the three machine system cooperating with the 400 kV network. The generative blocks models include turbine models with their controllers and models of synchronous generators with their excitation systems and voltage regulation....
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Modelling of Nuclear Power Plant Steam Turbine
PublikacjaThe paper describes the approach to a Nuclear Power Plant steam turbine modelling which would enable on-line optimal process control (model based) and diagnosis over wide range of operating conditions caused by changing power demand. Presented model is static, multivariable and nonlinear. Such model enables analyzing the heat cogeneration aspects. Developed model is validated and verified by using archive data gained from researches...
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Dynamic model of nuclear power plant turbine
PublikacjaThe paper presents the dynamic multivariable model of Nuclear Power Plant steam turbine. Nature of the processes occurring in a steam turbine causes a task of modeling it very difficult, especially when this model is intended to be used for on-line optimal process control (model based) over wide range of operating conditions caused by changing power demand. Particular property of developed model is that it enables calculations...
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A boost topology active power factor corrector.
PublikacjaPrzedstawiono układ analogowego aktywnego korektora zbudowanego na układzie scalonym kontrolera PWM oraz tranzystorem MOS jako okresowo przełączonym kluczem. Układ korektora zapewnia pobór prądu z sieci energetycznej w postaci przebiegu prawie sinusoidalnego o małych zniekształceniach i w fazie z sinusoidalnym napięciem sieci.
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The influence of adsorption chillers on CHP power plants
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Integration adsorption chillers with conventional power plant
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The Large Customer Reactive Power Control Possibilities
Publikacjan this paper the authors wish to draw attention to the rationale for, and the possibility of, the use of local reactive power sources by the Transmission Node Master Controller (TNMC). Large Customers (LC) are one of the possible reactive power sources. The paper presents the issues related to the need for coordination between the control systems installed in the LC network, and coordination between control systems of the LC as...
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Delivery of Ancillary Services in Distribution Power Systems
PublikacjaOne of the technical and organizational challenges the power system faces in deregulated market conditions is to organize an ancillary services market. The growing share of distributed generation of variable (intermittent) energy sources and a change in the market position of consumers, causes the demand for distributed delivery of ancillary services. For this purpose, it is sought to use the ability of the regulatory measures:...
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Symmetrical power line conditioner - basic properties
PublikacjaIn this paper the basis of analytical modelling of the UPQC arrangements (Unified Power Quality Conditioner) in d-q rotating coordinates, as well as select results of investigations conducted on the simplified small power laboratory model, were talked over. In short form power balance as well as fundamental dependences and analytical model with regard of decoupling circuits, were investigated. Applied method for DC link capacitance...
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Security Information Sharing for the Polish Power System
PublikacjaThe Polish Power System is becoming increasingly more dependent on Information and Communication Technologies which results in its exposure to cyberattacks, including the evolved and highly sophisticated threats such as Advanced Persistent Threats or Distributed Denial of Service attacks. The most exposed components are SCADA systems in substations and Distributed Control Systems in power plants. When addressing this situation...
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Power Electronic Transformer For Smart Grid Application
PublikacjaIn this paper the control system of Power Electronic Transformer (PET) for the Smart Grid application is proposed. The structure of PET is based on two Cascaded H-bridge (CHB) converters. The electrical energy is transferred between converters using Dual-Active-Bridges (DAB) and high-frequency transformers. This type of coupling has been used to connect the DC-links of all H-bridges. The proposed control system for PET makes it...
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CM Voltage Compensators for Power Electronic Interfaces
PublikacjaThe experimental results presented in the paper have shown that the application of the PEIs might cause EMC related problems, especially in the case of the application of a group of connected converters. The most convenient way to reduce EMI currents and prevent aggregation of EMI currents introduced by a group of converters is through passive compensation of voltage interference sources inside of the single converters. In the...
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The forming and emission of high power electromagnetic pulses
PublikacjaAn impulse energy source, a power conditioning system and an electromagnetic field emitter are essential to generate an electromagnetic field pulse (EMFP) with a specific frequency bandwidth. Selected simulation results for a power conditioning system consisting of a fuse opening switch and a paraboloidal electromagnetic emitter have been presented in this article. The synthetic system examined in the simulation is powered by an...
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HYDROSTATIC THRUST BEARING WITH REDUCED POWER LOSSES
PublikacjaIn many cases in rotating machinery, axial load is carried by tilting pad thrust bearings which have been developed since the beginning of 20th century. For high reliability and simplicity, most commonly the bearings are bath lubricated. In the times of sustainable development, however, minimization of friction losses becomes an important criterion for machinery assessment, and a strategic goal of their development. Performed calculations,...
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Identifying and Mitigating the Negative Effects of Power in Organizations
PublikacjaThis article investigates the possible negative effects of power in organizations. It demonstrates how holding power may affect an individual’s perception of others, actions, and cognition. Ways in which power may have a detrimental effect on different aspects of a manager’s functioning within an organization, including building relationships, communication, and performance are analyzed. It is argued that individuals are unaware...
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Dependence of Power Characteristics on Savonius Rotor Segmentation
PublikacjaSavonius rotors are large and heavy because they use drag force for propulsion. This leads to a larger investment in comparison to horizontal axis wind turbine (HAWT) rotors using lift forces. A simple construction of the Savonius rotor is preferred to reduce the production effort. Therefore, it is proposed here to use single-segment rotors of high elongation. Nevertheless, this rotor type must be compared with a multi-segment...
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New Performance Indices for Power System Stabilizers
PublikacjaThe subject of the article is issues related to innovative indices for power system stabilizers (PSSs). These new indices will be able to quickly show which PSS (among many other PSSs) is not working properly and that advanced optimization and simulation methods should be used to improve the PSS settings. The authors note the fact that the acceptance requirements for PSSs are different in various power systems. Moreover, the authors...
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Security Assessment of a Turbo-Gas Power Plant
PublikacjaCritical infrastructures are exposed to new threats due to the large number of vulnerabilities and architectural weaknesses introduced by the extensive use of information and communication technologies. This paper presents the results of an exhaustive security assessment for a turbo-gas power plant.
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Power enhancement of the Brayton cycle by steam utilization
PublikacjaThe paper presents thermodynamic analysis of the gas-steam unit of the 65 MWe combined heat and power station. Numerical analyses of the station was performed for the nominal operation conditions determining the Brayton and combined cycle. Furthermore, steam utilization for the gas turbine propulsion in the Cheng cycle was analysed. In the considered modernization, steam generated in the heat recovery steam generator unit is directed...
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Installation of Compensators in the Power System Transmission Grid
PublikacjaThe article discusses issues of reactive power compensation in transmission grids, with particular focus on the selection of compensator locations and basic parameters. Attention was focused on modern power electronics systems that ensure full automatic compensator adjustment to voltage or power criteria.
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Fuel systems of high power stationary engine
PublikacjaThe use of alternative fuels and, in the future, synthetic fuels has forced changes in the design of fuel supply systems in internal combustion engines. When operating a stationary engine at constant load, the possibility of using lean fuel mixtures appears. The selection of a precise operating mixture ignition system requires changes in traditional fuel systems. The article presents the current designs of fuel supply systems and...
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Assyrians Without Borders: Middle Eastern Christians Towards a New Form of Citizenship in Sweden
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Stainless Steels Sintered Form the Mixture of Prealloyed Stainless Steel and Alloying Element Powders
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Physicochemical properties of whole fruit plum powders obtained using different drying technologies
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Chemical Composition and Antioxidant Properties of Powders Obtained from Different Plum Juice Formulations
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Functional relationships between phytochemicals and drying conditions during the processing of blackcurrant pomace into powders
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Numerical calculations of wall pressures and stresses in steel cylindrical silos with concentric and eccentric hoppers
PublikacjaArtykuł przedstawia numeryczną analize naprężeń w płaszczu silosa. Porównane zostały wyniki dla silosów o przepływie centrycznym i mimośrodowym.
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How can HSR promote inter-city collaborative innovation across regional borders?
PublikacjaMany studies have shown that high-speed rail (HSR) can reshape the spatial pattern of economic geography. However, there needs to be more logical argumentation and rigorous empirical design on the paths and mechanisms involved. This paper considers the impact of the border effect on HSR links and innovation clusters from the perspective of inter-regional collaborative innovation. It provides a logical and compact theoretical...
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Model zwinnego procesu innowacji produktowej i organizacyjnej na przykładzie Wolters Kluwer
PublikacjaCelem artykułu jest przedstawienie zwinnego procesu innowacji produktowej i organizacyjnej opracowanej i zaimplementowanej w Wolters Kluwer. Przedstawiono cechy i naturę innowacji produktowej i organizacyjnej opisując jej podstawową charakterystykę. Omówione zostały główne założenia, szanse i zagrożenia zwinnego procesu innowacji. Opisano poszczególne kroki procesu, który pozwoli czytelnikowi zrozumieć sposób implementacji i zastosowania...
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Wear Resistance Enhancement of Al6061 Alloy Surface Layer by Laser Dispersed Carbide Powders
PublikacjaIn this paper, results of the experimental study on improving wear resistance in sliding friction of Al-based alloy are presented. The technique used involves the formation of a metal matrix composite (MMC) in the alloy surface layer by laser dispersion of carbide powders such as WC, TiC and SiC. For WC and TiC MMC surface coatings fabricated under conditions typical for most of the technologically relevant solid-state lasers (wavelength...
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Treatment of Hypertension in Patients 80 Years of Age or Older
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Heave Plates with Holes for Floating Offshore Wind Turbines
PublikacjaThe paper presents an innovative solution which is heave plates with holes. The long-known heave plates are designed to damp the heave motion of platforms. They are most often used for Spar platforms. The growing interest in this type of platform as supporting structures for offshore wind turbines makes it necessary to look for new solutions. Based on the available literature and the authors’ own research, it was concluded that...
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Influence of Holes Manufacture Technology on Perforated Plate Aerodynamics
PublikacjaTranspiration flow is a very important and still open subject in many technical applications. Perforated walls are useful for the purpose of “flow control”, as well as for the cooling of walls and blades (effusive cooling) in gas turbines. We are still not able to include large numbers of holes in the numerical calculations and therefore we need physical models. Problems are related also to the quality of the holes in perforated...
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Pointing device for elders with low cost and mixed manual-gaze control interface
PublikacjaW artykule przedstawiono projekt interfejsu pozwalającego na zastąpienie standardowej myszki komputerowej sterowaniem wzrokowym, z nieznacznym manualnym wspomaganiem. Manualne wspomaganie ma na celu korekcję współrzędnych kursora.
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New method of fractional order integrator analog modeling for orders 0.5 and 0.25
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Hydrostatic drives as safe and energy saving machines. The drive investigation method compatible diagram of power increase opposite to the direction of power flow
PublikacjaProjektanci i producenci napędu hydrostatycznego nie dysponują możliwością dokładnego określania jego sprawności energetycznej zmieniającej się szeroko w polu pracy napędzanego urządzenia a więc w pełnym zakresie zmiany prędkości i obciążenia silnika hydraulicznego oraz lepkości zastosowanego czynnika roboczego. Dotyczy to zarówno określania strat i sprawności maszyn wyporowych (pompy i silnika hydraulicznego) zastosowanych w układzie...
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Compensation of supply current harmonics, reactive power, and unbalanced load current balance in the closed-loop control of a shunt active power filter
PublikacjaThis paper presents the compensation tasks performed by a shunt active power filter, including compensation of harmonic currents, reactive power, and an unbalanced load current. The paper demonstrates novel control of the shunt active power filter in a closed-loop system. The control algorithm was verified by performing simulations and compared the simulated results with those obtained in an open-loop control system. All simulations...
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Study of impurities in alpha-Al 2 O 3 powders and crystals using EPR spectroscopy
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The assessment of exploitation process of power for access control system
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Analog multiplier for a low-power integrated image sensor
PublikacjaArtykuł przedstawia nowe podejście do projektowania tanich niskomocowych zintegrowanych sensorów optycznych. W odróżnieniu od wcześniej stosowanych rozwiązań opartych na masowym przetwarzaniu równoległym, zaproponowany mnożnik macierzowy charakteryzuje się korzystniejszymi cechami. Proponowane rozwiązanie, chociaż mniej elastyczne w sensie liczby możliwych do zaimplementowania algorytmów wstępnej obróbki obrazu, cechuje się znaczącą...
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Analog multiplier for a low-power integrated image sensor
PublikacjaArtykuł przedstawia nowe podejście do projektowania tanich niskomocowych zintegrowanych sensorów optycznych. W odróżnieniu od wcześniej stosowanych rozwiązań opartych na masowym przetwarzaniu równoległym, zaproponowany mnożnik macierzowy charakteryzuje się korzystniejszymi cechami. Proponowane rozwiązanie, chociaż mniej elastyczne w sensie liczby możliwych do zaimplementowania algorytmów wstępnej obróbki obrazu, cechuje się znaczącą...