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1
Content available Silicon carbide based DC-DC converter – operating analysis
Niewiara Ł., Tarczewski T., Grzesiak L. M.
Poznan University of Technology Academic Journals. Electrical Engineering
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2016
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No. 88
109--119
EN
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.
2
Content available Computer aided design of snubber circuit for DC/DC converter with SiC power MOSFET devices
Niewiara Ł., Skiwski M., Tarczewski T., Grzesiak L. M.
Poznan University of Technology Academic Journals. Electrical Engineering
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2015
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No. 84
77--83
EN
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.
3
Content available remote Trójfazowy mostkowy falownik napięcia o regulowanym napięciu obwodu pośredniczącego
Niewiara Ł., Tarczewski T., Grzesiak L. M.
Przegląd Elektrotechniczny
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2014
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R. 90, nr 6
109--114
PL
W artykule przedstawiono koncepcję budowy trójfazowego mostkowego falownika napięcia o regulowanym poziomie napięcia obwodu pośredniczącego. Zmiana wartości napięcia obwodu pośredniczącego realizowana jest przy pomocy przetwornicy DC/DC o regulowanej wartości napięcia wyjściowego. Jako obciążenie zastosowano zasilany z trójfazowego falownika napięcia symetryczny trójfazowy obwód RL z regulowanym prądem obciążenia. Przedstawiono wyniki badań symulacyjnych zaproponowanego układu dla skokowych zmian wartości napięcia oraz prądu obciążenia.
EN
In this paper concept of three-phase bridge voltage inverter with controlled DC bus voltage level is presented. The modification of the DC bus voltage value is realized with the help of the DC/DC buck converter with controlled DC voltage level. A three-phase symmetric RL circuit fed by three-phase voltage source inverter with adjustable load current was used as the load of the DC/DC buck converter. Simulation test results of the proposed system during step changes of voltage and load current values were presented.
4
Content available Neural network based adaptive state feedback controller for inverter with voltage matching circuit
Niewiara Ł., Tarczewski T., Grzesiak L. M.
Poznan University of Technology Academic Journals. Electrical Engineering
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2014
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No. 80
231--238
EN
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.
5
Content available Based on neural network adaptive linear quadratic regulator for inverter with voltage matching circuit
Niewiara Ł., Tarczewski T., Grzesiak L.M.
Computer Applications in Electrical Engineering
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2014
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Vol. 12
434--443
EN
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.
6
Content available Auto-strojenie regulatora typu PID z wykorzystaniem logiki rozmytej
Niewiara Ł., Zawirski K.
Poznan University of Technology Academic Journals. Electrical Engineering
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2013
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No. 75
79--84
PL
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.
EN
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.
7
Content available Auto-tuning of PID controller based on fuzzy logic
Niewiara Ł., Zawirski K.
Computer Applications in Electrical Engineering
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2013
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Vol. 11
230--240
EN
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.
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