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    Wyświetlanie 1-8 z 8
    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:
    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:
    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:
    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:
    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:
    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:
    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
      Wyświetlanie 1-8 z 8

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