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    Wyświetlanie 1-9 z 9
    Tytuł:
    Mikroprocesorowy układ sterowania do trójpoziomowego przekształtnika napięcia
    Microprocessor control system for a three-level voltage converter
    Autorzy:
    Korzeniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/158440.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    DSP
    CPLD
    PWM
    przekształtnik trójpoziomowy
    three-level converter
    Opis:
    W artykule zaprezentowano mikroprocesorowy układ sterowania zaprojektowany na potrzeby sterowania przekształtnikami trójpoziomowymi. Dzięki zastosowaniu jednostki obliczeniowej typu DSP (digital signal processor) układ sterowania charakteryzuje się wysoką wydajnością obliczeniową co umożliwia realizację skomplikowanych algorytmów sterowania w czasie rzeczywistym. Otwarta architektura systemu mikroprocesorowego zapewnia łatwą i szybką rozbudowę dzięki czemu możliwe jest zastosowanie układu w różnych aplikacjach przemysłowych.
    The paper presents a microprocessor control system (Fig. 1) consisting of: a processor card (Fig. 3), an AD/DA converter card (Fig. 5), an interface card (PWM, deadtime, watchdog timer) for a voltage converter (Fig. 6) and a keyboard interface with LCD display (Fig. 7). The microprocessor control system was designed according to requirements for a three-level converter. Due to application of a floating point DSP (digital signal processor) unit, the system is characterised by high efficiency, which enables it to realise complicated control algorithms in real time. The open microprocessor control system architecture providing easy and fast development (Fig. 2) makes it possible to apply this system to industry. The presented control system is very useful for labora-tories having AC/DC converters and DC/AC two and three-level converters. The microprocessor control system with a DSP unit is used for realisation of complex control algorithms, e.g. the ones described in [9, 10, 11].
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 4, 4; 308-311
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elektryczny Pojazd Balansujący - realizacja praktyczna
    Balancing Electric Vehicle - practical implementation
    Autorzy:
    Falkowski, P.
    Korzeniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/157920.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Segway
    MEMS
    ARM
    pojazd elektryczny
    LabVIEW
    electric vehicle
    Opis:
    W artykule opisano zasadę działania oraz budowę Elektrycznego Pojazdu Balansującego. Zbudowany pojazd został skonstruowany przez studentów Koła Naukowego Techniki Mikroprocesorowej w Energoelektronice, którzy zostali zainspirowani seryjnie produkowanym pojazdem. W artykule omówiony został zaprojektowany i wykonany układ sterujący, którego głównymi elementami są czujniki MEMS. Przedstawiono w nim opracowany algorytm sterujący pracą silników elektrycznych odpowiedzialnych za poruszanie się pojazdu i utrzymywanie pozycji pionowej.
    This paper presents the Electric Balancing Vehicle, which has been designed based on the standard Personal Transporter produced by Segway®. This vehicle is unstable, because of the fact that its centre of gravity is above the axis of rotation, which causes the effect of an inverted pendulum (Fig. 1). In order to hold the vehicle in a vertical position (Y axis in Fig. 1a), it is necessary to provide the continuous, active regulation by proper control of a torque to the wheels. Fig. 2 shows the block diagram of the control system, where control of the inclination angle is the primary control loop. The method of determining the angle of the platform is shown in Fig. 5. The main part of the vehicle control system (Figs. 3 and 4) is a 32-bit Micro-controller STM32F103 from STMicroelectronis. Its main tasks are: collecting data from voltage and current MEMS sensors, executing the control algorithm (Fig. 2) and controlling the electric motors. The wheel drive uses two DC brushed motors with permanent magnets (each of 750W power), controlled by DC/DC converters (Fig. 6) with the option of returning the energy to batteries during a braking process. The data such as angle and motor currents are sent through a Bluetooth module to a PC and displayed in LabVIEW (Fig. 9).
    Źródło:
    Pomiary Automatyka Kontrola; 2013, R. 59, nr 12, 12; 1285-1288
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency based islanding detection methods in power electronic converters
    Autorzy:
    Dmitruk, K.
    Korzeniewski, M.
    Sikorski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193396.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    anti-islanding protection
    active frequency drift
    grid converter
    Opis:
    Frequency based methods developed to detect an islanding condition in modern power grid structures have been discussed. The condition may occur in power grid lines to which additional energy sources with power electronic converters have been connected such as solar panels or wind turbines. It is a hazardous operating state for grid workers and devices connected to the islanded part of the grid. Such a state results from the inability to control amplitude and frequency of basic harmonic of the grid voltage. An islanding problem in a power grid with additional small energy sources has been discussed. A basic passive and active islanding detection method have been presented and compared with known frequency based algorithms, namely active frequency drift and active frequency drift with a positive feedback algorithm. Finally, a laboratory test of the proposed islanding detection methods in a three-phase grid with an AC-DC converter has been conducted. To demonstrate differences between the tested methods, total harmonic distortion injected into the output converter current and detection time of islanding state have been measured.
    Źródło:
    Power Electronics and Drives; 2017, 2, 37/1; 27-41
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern Direct Torque and Flux Control methods of an induction machine supplied by three-level inverter
    Autorzy:
    Sikorski, A.
    Kulikowski, K.
    Korzeniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201199.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asynchronous machine
    DC/AC inverter
    DTC
    flux and torque control
    3-level DC/AC inverter
    Opis:
    This paper describes two modern direct torque and flux control methods of an induction machine supplied by a three-level inverter. Additionally, it presents a comparison of the methods both in static and dynamic states. The methods, in a specific way, make use of an increased number of active vectors of the three-level inverter in order to improve control quality and reduce switching frequency. The two methods modify the DTC method by using its advantages and eliminating, at the same time its drawbacks. In static states the comparison was based on the results of investigations performed for two different load values and three set values of angular speed, whereas in dynamic states the comparison was focused on the behavior of the machine at startup. The results of the investigations have shown that both methods give very good performance. They are characterized by both sinusoidal shape of flux and low current deformations even at low angular speeds i.e. less than 10% of the nominal value. The presented methods also allow to generate nominal flux for set zero angular speed in order to achieve excitation of the induction machine. The switching frequencies for both methods are very similar in almost the whole range of control but the methods have shown some differences in control quality, particularly for higher torque values.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 771-778
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of active rectifier with LCL filter in the selection process of the weighting factors in finite control set-MPC
    Autorzy:
    Falkowski, P.
    Sikorski, A.
    Kulikowski, K.
    Korzeniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200718.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model predictive control (MPC)
    active front end converters
    inductive-capacitive-inductive (LCL) filter
    weighting factors selection
    Opis:
    One of the main problems of multivariable cost functions in model predictive control is the choice of weighting factors. Two finite control set model predictive control algorithms, applied to the three-phase active rectifier with an LCL filter, are described in the paper. The investigated algorithms, i.e. PCicuc and PCigicuc, implement multivariable approaches applying line (grid) current, capacitor voltage and converter current. The main problem dealt with in the paper is the choice of optimum values of the cost function weighting factors. The values of the factors calculated using the method proposed in the paper are very close to the values represented by the lowest THDi of the line current. Moreover, simulations verifying the equations used in the prediction of controlled values, i.e. line current, capacitor voltage and converter current, are presented. Both simulation and experimental results are presented to verify effectiveness of the investigated control strategies under change of the load (P = 5 kW and 2.5 kW), during transient states, under unbalanced and balanced line voltage.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 51-60
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of a Web-based remote control system for qZS DAB application using low-cost ARM platform
    Autorzy:
    Korzeniewski, M.
    Kulikowski, K.
    Zakis, J.
    Jasiński, M.
    Malinowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201276.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ARM processor
    DAB converter controller
    network controller
    web-based user interface
    energy control
    procesor ARM
    kontroler
    konwerter
    kontroler sieciowy
    interfejs użytkownika oparty na sieci Web
    kontrola energii
    DAB
    Opis:
    Continuous development of intelligent network applications drives the demand for deployment-ready hardware and software solutions. Such solutions are highly valued not only by distributed producers of energy but by energy consumers as well. The use of intelligent network applications enables the development and improvement of the quality of services. It also increases self-sufficiency and efficiency. This paper describes an example of such device that allows for the control of a dual active bridge (DAB) converter and enables its remote control in real time over an IP-based network. The details of both hardware and software components of proposed implementation are provided. The DAB converter gives a possibility to control and manage the energy between two DC power systems with very different voltage levels. Not only information, but also the quality of energy, the direction of power flow, and energy storage systems can be easily controlled through an IP-based network and power electronics converters. Information technology, together with intelligent control of power electronics technology, provides a flexible solution, especially for sustainable smart grids.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 887-896
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear analysis of cemented carbide during turning of cast iron considering economical machining speed
    Autorzy:
    Znojkiewicz, N.
    Korzeniewski, D.
    Wiciak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/94192.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    economical machining speed
    turning
    tool wear
    cast iron
    cemented carbide
    prędkość obrotowa
    toczenie
    zużycie narzędzi
    żeliwo
    węglik spiekany
    Opis:
    The purpose of this paper is to find economical machining speed during turning of grooves for piston rings with various feeds. In the first part of the paper, literature analysis concerning durability of cutting tools is presented. Next, the wear of cemented carbide cutting tools during turning of cast iron is researched. The research has been done for seven cutting tools. During conducted turning trials, angular speed has been altered from n=530rev/min to n=710rev/min and feeds from f=0.007mm/rev to f=0.105mm/rev. On the basis of Taylor’s equation, which relates cutting speed to tool life, the economical cutting speed is established with the application of two various methods.
    Źródło:
    Archives of Mechanical Technology and Materials; 2017, 37; 27-34
    2450-9469
    Pojawia się w:
    Archives of Mechanical Technology and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and the physical and thermal properties of thermoplastic polyurethane reinforced with thermally reduced graphene oxide
    Autorzy:
    Strankowski, M.
    Piszczyk, Ł.
    Kosmela, P.
    Korzeniewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779423.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nanocomposites
    graphene
    polyurethane
    carbon nanofillers
    TRG
    Opis:
    In this study, thermally reduced graphene oxide (TRG)-containing polyurethane nanocomposites were obtained by the extrusion method. The content of TRG incorporated into polyurethane elastomer systems equaled 0.5, 1.0, 2.0 and 3.0 wt%. The morphology, static and dynamic mechanical properties, and thermal stability of the modified materials were investigated. The application of TRG resulted in a visible increase in material stiffness as confirmed by the measurements of complex compression modulus (E′) and glass transition temperature (Tg). The Tg increased with increasing content of nanofiller in the thermoplastic system. The addition of thermally reduced graphene oxide had a slight effect on thermal stability of the obtained materials. The incorporation of 0.5, 1.0, 2.0 and 3.0 wt% of TRG into a system resulted in increased char residues compared to unmodified PU elastomer. Also, this study demonstrated that after exceeding a specific amount of TRG, the physicomechanical properties of modified materials start to deteriorate.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 88-94
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Występowanie pestycydów persystentnych w latach 1971-1973 w wodach użytkowanych dla potrzeb komunalnych na terenie miasta Wrocławia oraz niektórych województw
    Presence of persistent pesticides in the years 1971-1973 in water used for community purposes in the city of Wroclaw and in certain provinces
    Soderzhanie ystojjchchibykh pesticidov v 1971-1973 gody v vode upotrebljaemojj dlja kommunalnykh celejj v gorode Vroclave i nekotorykh voevodstvakh
    Autorzy:
    Brzezinski, Z.
    Luczak, J.
    Maniowska, A.
    Borowiak, M.
    Wieczorek, H.
    Starzyk, J.
    Korzeniewski, K.
    Smolarek, H.
    Sobczak-Brudkiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/874187.pdf
    Data publikacji:
    1982
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    pestycydy
    wody uzytkowe
    Wroclaw
    stacje sanitarno-epidemiologiczne
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 1982, 33, 4
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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