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    Wyświetlanie 1-6 z 6
    Tytuł:
    LQG/LTR control of input-delayed discrete-time systems
    Autorzy:
    Horla, D.
    Krolikowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200895.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    LQG control
    loop transfer recovery
    time-delay
    Opis:
    A simple robust cheap LQG control is considered for discrete-time systems with constant input delay. It is well known that the full loop transfer recovery (LTR) effect measured by error function ∆(z) can only be obtained for minimum-phase (MPH) systems without time-de-lay. Explicit analytical expressions for ∆(z) versus delay d are derived for both MPH and NMPH (nonminimum-phase) systems. Obviously, introducing delay deteriorates the LTR effect. In this context the ARMAX system as a simple example of noise-correlated system is examined. The robustness of LQG/LTR control is analyzed and compared with state prediction control whose robust stability is formulated via LMI. Also, the robustness with respect to uncertain time-delay is considered including the control systems which are unstable in open-loop. An analysis of LQG/LTR problem for noise-correlated systems, particularly for ARMAX system, is included and the case of proper systems is analyzed. Computer simulations of second-order systems with constant time-delay are given to illustrate the performance and recovery error for considered systems and controllers.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1049-1058
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing power system protections utilizing hardware-in-the-loop simulations on real-time Linux
    Autorzy:
    Krakowski, M.
    Nogal, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/201732.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hardware-in-the-loop simulation
    testing
    real time systems
    power systems protection
    Opis:
    The complexity of power system phenomena challenges power system protection testing to obtain the required adequacy of the testing environment. Hardware-in-the-loop simulation in real-time substantially increases testing capabilities. However, there is still the question of the availability of commercial solutions. To address the challenges, a new hardware-in-the loop system has been designed and implemented utilizing the easily available Matlab/Simulink environment and Linux RT Preempt OS. The custom software part prepared for the presented system is based on the Matlab/Simulink s-function mechanism, Embedded Coder toolbox and Advantech biodaq library as the interface for the utilized I/O cards. The simulator’s real-time performance limits on Linux RT Preempt have been verified, and it was shown that its performance is sufficient to conduct successful tests of protection relays. Consequently, a simple power system protection relay testing example is provided, including a discussion of results. Finally, it has been proven that the presented system can be utilized as a simpler and more accessible hardware-in-the-loop testing alternative to commercial simulators.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1099-1105
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real-time human in the loop MBS simulation in the Fraunhofer robot-based driving simulator
    Symulacja w czasie rzeczywistym układu wieloczłonowego z człowiekiem w pętli w opartym na robocie symulatorze kierowania pojazdem opracowanym w Instytucie Fraunhofera
    Autorzy:
    Kleer, M
    Gizatullin, A
    Dreßler, K.
    Müller, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/139514.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    driving simulator
    human in the loop
    real-time MBS simulation
    symulator jazdy
    MBS
    czas rzeczywisty
    Opis:
    The paper encompasses the overview of hardware architecture and the systems characteristics of the Fraunhofer driving simulator. First, the requirements of the real-time model and the real-time calculation hardware are defined and discussed in detail. Aspects like transport delay and the parallel computation of complex real-time models are presented. In addition, the interfacing of the models with the simulator system is shown. Two simulator driving tests, including a fully interactive rough terrain driving with a wheeled excavator and a test drive with a passenger car, are set to demonstrate system characteristics. Furthermore, the simulator characteristics of practical significance, such as simulator response time delay, simulator acceleration signal bandwidth obtained from artificial excitation and from the simulator driving test, will be presented and discussed.
    Artykuł zawiera przeglĄd architektury sprzętowej i charakterystyk systemowych symulatora kierowania pojazdem opracowanego w Instytucie Fraunhofera. Na wstępie zdefiniowano i przedyskutowano szczegółowo wymagania dla modelu czasu rzeczywistego i obliczeń w czasie rzeczywistym. Zaprezentowano takie aspekty systemu, jak opóźnienie transportu i obliczenia równoległe złoŻonych modeli czasu rzeczywistego. Pokazano ponadto działanie interfejsu pomiędzy modelem i systemem symulatora. W celu zademonstrowania charakterystyk systemu wykonano dwa testy symulatora: w pełni interaktywny test kierowania koparkĄ kołowĄ w nierównym terenie, oraz test kierowania samochodem pasaŻerskim. Co więcej, charakterystyki symulatora majĄce znaczenie praktyczne, takie jak opóźnienie czasowe odpowiedzi symulatora, pasmo sygnału przyspieszenia symulatora wyznaczone przy sztucznym pobudzeniu i z testu kierowania pojazdem zostały zaprezentowane i przedyskutowane.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 2; 270-285
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability analysis for discrete-time fractional-order LTI state-space systems. Part II: New stability criterion for FD-based systems
    Autorzy:
    Stanisławski, R.
    Latawiec, K. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200325.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Grünwald-Letnikov fractional difference
    discrete-time fractional order system
    stability criterion
    non-minimum phase system
    closed loop stability
    Opis:
    This paper presents a series of new results on the asymptotic stability of discrete-time fractional difference (FD) state space systems and their finite-memory approximations called finite FD (FFD) and normalized FFD (NFFD) systems. In Part I of the paper, new necessary and sufficient stability conditions have been given in a unified form for FD, FFD and NFFD-based systems. Part II offers a new, simple, ultimate stability criterion for FD-based systems. This gives rise to the introduction of new definitions of the so-called f-poles and f-zeros for FD-based systems, which are used in the closed-loop stability analysis for FD-based systems and, approximately, for FFD/NFFD-based ones.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 363-370
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and reliability analysis of three phase z-source AC-AC converter
    Autorzy:
    Prasad, H.
    Maity, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/140661.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    real-time digital simulation (RTDS)
    field programming gate array (FPGA)
    hardware-in-the-loop (HIL)
    z-source ac-ac converter
    PID controller
    Opis:
    This paper presents the small signal modeling using the state space averaging technique and reliability analysis of a three-phase z-source ac-ac converter. By controlling the shoot-through duty ratio, it can operate in buck-boost mode and maintain desired output voltage during voltage sag and surge condition. It has faster dynamic response and higher efficiency as compared to the traditional voltage regulator. Small signal analysis derives different control transfer functions and this leads to design a suitable controller for a closed loop system during supply voltage variation. The closed loop system of the converter with a PID controller eliminates the transients in output voltage and provides steady state regulated output. The proposed model designed in the RT-LAB and executed in a field programming gate array (FPGA)-based real-time digital simulator at a fixedtime step of 10 μs and a constant switching frequency of 10 kHz. The simulator was developed using very high speed integrated circuit hardware description language (VHDL), making it versatile and moveable. Hardware-in-the-loop (HIL) simulation results are presented to justify the MATLAB simulation results during supply voltage variation of the three phase z-source ac-ac converter. The reliability analysis has been applied to the converter to find out the failure rate of its different components.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 4; 731-743
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The real-time simulator using MATLAB/Simulink software for closed-loop coordination protection devices testing
    Autorzy:
    Smolarczyk, Adam
    Łapczyński, Sebastian
    Szulborski, Michał
    Kolimas, Łukasz
    Kozarek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2086829.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    real-time simulator
    distance protections
    protection relays testing
    closed-loop testing
    MATLAB/Simulink
    symulator czasu rzeczywistego
    zabezpieczenia odległościowe
    testowanie przekaźników zabezpieczeniowych
    testowanie w pętli zamkniętej
    Opis:
    This paper aims to discuss the behavior of the proprietary real-time simulator (RTS) during testing the coordination of distance relay protections in power engineering. During the construction process of the simulator, the mapping of various dynamic phenomena occurring in the modeled part of the power system was considered. The main advantage to the solution is a lower cost of construction while maintaining high values of essential parameters, based on the generally available software environment (MATLAB/Simulink). The obtained results are discussed in detail. This paper is important from the point of view of the cost-effectiveness of design procedures, especially in power systems exploitation and when avoiding faults that result from the selection of protection relay devices, electrical devices, system operations, and optimization of operating conditions. The manuscript thoroughly discusses the hardware configuration and sample results, so that the presented real-time simulator can be reproduced by another researcher.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137413, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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