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    Wyświetlanie 1-13 z 13
    Tytuł:
    Auto-tuning of PID controller based on fuzzy logic
    Autorzy:
    Niewiara, Ł.
    Zawirski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/97393.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    PID controller
    auto-tuning
    fuzzy logic
    Opis:
    Issues related to the automatic selection of the PID controller settings have been known for several years. This article describes the concept of self-tuning using fuzzy logic block (FLB). The FLB represents expert knowledge and in the process serves as the master. It describes the advantages of the designed structure of fuzzy logic simulation system application. The paper contains block diagram descriptions of designed controller and control loop. The designed tuning algorithm bases on quality indicators and rule bases which was described as membership functions. The readjustment of the controller settings takes place in subsequent iterations of the tuning process. Simulation tests result of the proposed tuning system topology were presented. As the simulation environment was used Matlab Simulink.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 230-240
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Auto-strojenie regulatora typu PID z wykorzystaniem logiki rozmytej
    Autotuning of PID controller based on fuzzy logic
    Autorzy:
    Niewiara, Ł.
    Zawirski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/377397.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    regulator PID
    auto-strojenie regulatora
    logika rozmyta
    Blok Logiki Rozmytej
    BLR
    Opis:
    Zagadnienia związane z automatycznym doborem nastaw regulatorów typu PID znane są już od kilkunastu lat. W niniejszym artykule opisano koncepcję auto-strojenia wykorzystującego Blok Logiki Rozmytej, który w całym procesie pełni rolę układu nadrzędnego, reprezentującego wiedzę ekspercką. Opisano tutaj zalety zastosowania logiki rozmytej, strukturę zaprojektowanego układu symulacyjnego, algorytm strojenia, sposób zmiany nastaw oraz przedstawiono wyniki badań symulacyjnych wykonanych w środowisku MatLab.
    Issues related to the automatic selection of the PID controller settings have been known for several years. This article describes the concept of autotuning using fuzzy logic block, which in the process serves as the master. It describes the advantages of the application of fuzzy logic simulation system designed structure, algorithm tuning, how to change the settings and the results of simulation studies carried out in MatLab environment.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 75; 79-84
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicon carbide based DC-DC converter – operating analysis
    Autorzy:
    Niewiara, Ł.
    Tarczewski, T.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/377549.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    DC\DC converter
    SiC MOSFETS
    high switching frequency
    Opis:
    In this paper operating analysis of DC-DC converter is presented. Silicon Carbide based DC-DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC-DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 88; 109-119
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neural network based adaptive state feedback controller for inverter with voltage matching circuit
    Autorzy:
    Niewiara, Ł.
    Tarczewski, T.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/376361.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    adaptive linear-quadratic controller
    voltage matching circuit
    artificial neural network
    current ripple
    Opis:
    This paper describes a discrete adaptive state feedback controller used to load current control in terms of variable DC voltage of inverter. Controller was designed by using linear quadratic optimization method. Adaptive LQR was used because of non-stationarity of the control system caused by Voltage Matching Circuit - VMC. Gain values of the adaptive controller were approximated by using an artificial neural network. The VMC was realized as an additional buck converter integrated with the main inverter. As the load of the 2-level inverter a 3-phase symmetric RL circuit was used. Simulation tests show the behavior of the load current regulation during DC bus voltage level step changes. The dependence between current RMS value and inverter DC bus voltage level was also shown. Simulation test was made by using Matlab Simulink and PLECS software.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 231-238
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Based on neural network adaptive linear quadratic regulator for inverter with voltage matching circuit
    Autorzy:
    Niewiara, Ł.
    Tarczewski, T.
    Grzesiak, L.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97686.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    adaptive linear-quadratic regulator
    voltage matching circuit
    artificial neural network
    current ripple
    Opis:
    This paper describes a discrete adaptive linear quadratic regulator used to load current control in terms of variable DC voltage of inverter. Controller was designed by using linear quadratic optimization method. Adaptive LQR was used because of non-stationarity of the control system caused by Voltage Matching Circuit - VMC. Gain values of the adaptive controller were approximated by using an artificial neural network. The VMC was realized as an additional buck converter integrated with the main inverter. As the load of the 2-level inverter a 3-phase symmetric RL circuit was used. Simulation tests show the behavior of the load current regulation during DC bus voltage level step changes. The dependence between current RMS value and inverter DC bus voltage level was also shown. There were also made a comparison of the traditional 2-level inverter structure with the modified structure uses VMC. Simulation test was made by using Matlab Simulink and PLECS software.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 434-443
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of circuit and operation for DC–DC converter based on silicon carbide
    Autorzy:
    Niewiara, Ł. J.
    Tarczewski, T.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97287.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    DC\DC converter
    SiC MOSFETS
    high switching frequency
    DC–DC converter design
    snubber circuit
    Opis:
    In this paper operating analysis of DC–DC converter is presented. Silicon Carbide based DC–DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC–DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). Real power semiconductors are equipped in output and input capacitances. This feature may influence the generated input signal. Parasitic capacitances and inductances of the paths causes oscillations and voltage overshoots of the input PWM signal. To avoid such phenomenon, it is necessary to use a snubber circuit. This issue is also presented. The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 268-279
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial bee colony based state feedback position controller for PMSM servo-drive – the efficiency analysis
    Autorzy:
    Tarczewski, T.
    Niewiara, L. J.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200239.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tuning
    PMSM servo-drive
    artificial bee colony algorithm
    linear-quadratic optimization problem
    pole placement
    Opis:
    This paper presents a state feedback controller (SFC) for position control of PMSM servo-drive. Firstly, a short review of the commonly used swarm-based optimization algorithms for tuning of SFC is presented. Then designing process of current control loop as well as of SFC with feedforward path is depicted. Next, coefficients of controller are tuned by using an artificial bee colony (ABC) optimization algorithm. Three of the most commonly applied tuning methods (i.e. linear-quadratic optimization, pole placement technique and direct selection of coefficients) are used and investigated in terms of positioning performance, disturbance compensation and robustness against plant parameter changes. Simulation analysis is supported by experimental tests conducted on laboratory stand with modern PMSM servo-drive.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 997-1007
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of extended Kalman filter for estimation of periodic disturbance and velocity ripple reduction in PMSM drive
    Autorzy:
    Niewiara, Ł. J.
    Tarczewski, T.
    Grzesiak, L M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201499.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    extended Kalman filter
    disturbance estimation
    PMSM drive
    pulsating torque
    velocity ripple reduction
    Opis:
    In this paper an application of extended Kalman filter (EKF) for estimation and attenuation of periodic disturbance in permanent magnet synchronous motor (PMSM) drive is investigated. Most types of disturbances present into PMSM drive were discussed and described. The mathematical model of the plant is presented. Detailed information about the design process of the disturbance estimator was introduced. A state feedback controller (SFC) with feedforward realizes the regulation and disturbance compensation. The theoretical analysis was supported by experimental tests on the laboratory stand. Both time- and frequency-domain analysis of the estimation results and angular velocity were performed. A significant reduction of velocity ripple has been achieved.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 983-995
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of artificial bee colony algorithm to auto-tuning of state feedback controller for DC-DC power converter
    Autorzy:
    Tarczewski, T.
    Niewiara, Ł. J.
    Grzesiak, L M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193254.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    artificial bee colony algorithm
    state feedback controller
    DC-DC power converter
    SiC MOSFET
    Opis:
    The article presents an auto-tuning method of state feedback voltage controller for DC-DC power converter. The penalty matrices employed for calculation of controller’s coefficients were obtained by using nature-inspired artificial bee colony (ABC) optimization algorithm. This overcomes the main drawback of state feedback control related to time-consuming trial-and-error tuning procedure. The optimization algorithm takes into account constraints of selected state and control variables of DC-DC power converter. In order to meet all control objectives (i.e., fast voltage response and chattering-free control signal) an appropriate performance index is proposed. Proper selection of state feedback controller (SFC) coefficients is proven by simulation and experimental tests of DC-DC power converter.
    Źródło:
    Power Electronics and Drives; 2016, 1, 36/2; 83-96
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer aided design of snubber circuit for DC/DC converter with SiC power MOSFET devices
    Autorzy:
    Niewiara, Ł.
    Skiwski, M.
    Tarczewski, T.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/378069.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    DC\DC converter
    snubber circuit
    SiC MOSFET
    Opis:
    In this paper a computer aided design of snubber circuit for DC\DC converter is presented. Due to the presence of parasitic LC circuit in the power stage (inductance and capacitance), it is necessary to use an additional snubber circuit for voltage overshoot and oscillations reduction. A simulation model of the converter with parasitic circuit was designed. Three types of snubber circuits (C, RC, RCD) were investigated in simulation tests. Simulation model of the proposed system has been investigated in Matlab/Simulink/PLECS environment. Input signal parameters like voltage overshoot, rise time, fall time were compared for considered snubber circuits. Experimental tests were carried out for the best simulation result. It confirm the proper choice of snubber circuit.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 84; 77-83
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of snubber circuit design for SiC power MOSFET devices
    Autorzy:
    Niewiara, Ł. J.
    Skiwski, M.
    Tarczewski, T.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97236.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    DC\DC converter
    snubber circuit
    SiC MOSFET
    Opis:
    In this paper a design process of snubber circuit for DC\DC converter is presented. Computer simulation and experimental tests were carried out. Due to the presence of parasitic LC (inductance and capacitance) circuit in the power stage, it is necessary to use an additional snubber circuit for voltage overshoot and oscillations reduction. A simulation model of the converter with parasitic circuit was designed. Six topologies of snubber circuits (C, single C, RC, single RC, RCD, single RCD) were investigated in simulation tests. Simulation model of the proposed system has been investigated in Matlab/Simulink/PLECS environment. Input signal parameters like voltage overshoot, rise time, fall time were compared for considered snubber circuits. Experimental tests were carried out for the best simulation results. It confirm the proper choice of snubber circuit.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 120-131
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-performance PMSM servo-drive with constrained state feedback position controller
    Autorzy:
    Tarczewski, T.
    Skiwski, M.
    Niewiara, L. J.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200374.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    constrained control
    model predictive approach
    permanent magnet synchronous motor
    position control
    state feedback control
    model predykcyjny
    silnik synchroniczny z magnesem trwałym
    sprzężenie zwrotne
    Opis:
    This paper describes high-performance permanent magnet synchronous motor (PMSM) servo-drive with constrained state feedback (SFC) position controller. Superior behavior of the control system has been achieved by applying SFC with constraints handling method based on a posteriori model predictive approach (MPAC). The concept utilizes predictive equations obtained from discrete-time model of the PMSM to compute control signals which generate admissible values of the future state variables. The novelty of the proposed solution lies in the limitation of several state-space variables in servo-drive control system. Since MPAC has firstly been applied to limit more than one state-space variable of the plant, necessary conditions for introducing constraints into multivariable control system with SFC are depicted. Due to the low complexity of proposed algorithm, a low cost microprocessor, STM32F4, is employed to execute the state feedback position control with model predictive approach to constraints handling. Experimental results show that the proposed control method provides superior performance of PMSM servodrive with modern SiC based voltage source inverter (VSI).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 49-58
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    (Nie)konflikt wiary z niewiarą we wspólnocie na przykładzie myśli Jeana Vaniera – założyciela wspólnoty niepełnosprawnych L’Arche
    Autorzy:
    Stachurski, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2134385.pdf
    Data publikacji:
    2020-10-09
    Wydawca:
    Polskie Towarzystwo Religioznawcze
    Tematy:
    community
    theism
    atheism
    philosophy of religion
    Opis:
    Jean Vanier, who founded the L’Arche community in France for over 50 years, relied heavily on the foundation of Christian thought and realistic philosophy, which is firmly built on Aristotelianism and Thomism. It is hard not to notice that Vanier often refers in his books and other publications or statements to Christian roots. At the same time, in the books about the community (mainly “The community is a place of joy and forgiveness”), he indicates that in the communities of the Ark there is a place for both believers and non-believers. On the intellectual level, it is difficult not to notice the conflict between inclusiveness (the invitation to be in the community is directed to everyone) and exclusivity (the foundations of the community, its spiritual heart are Christian and Catholic roots). In my article, I would like to highlight three main elements: a brief introduction on Vanier’s understanding of community; the importance of the Christian religion in building a community; an attempt to reconcile faith with unbelief in community in Vanier’s view.
    Źródło:
    Przegląd Religioznawczy; 2020, 1/275; 137-146
    1230-4379
    Pojawia się w:
    Przegląd Religioznawczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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