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Asynchronous dynamometer - power inverter
Vetiška, Vojtěch ; Červinka, Dalibor (referee) ; Klíma, Bohumil (advisor)
This project deals with the power converter for the asynchronous dynamometer. Inside of the document we shall acquaint with claims towards switching transistors and actuators. Furthermore we shall go through the principle and the wiring of three-phase converters and active rectifiers . We specify particular conditions of parameters for the power converter. For these conditions we shall dimension particular elements of the power converter. On the end we shall design the mechanical arrangement of the power circuit and create the design documentation..
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Permanent magnet synchronous generator with active rectifier
Michaliczek, Jan ; Cipín, Radoslav (referee) ; Vítek, Ondřej (advisor)
The main objective of the master`s thesis was to prove, if permanent magnet synchronous generator made by company JULI Motorenwerk s.r.o. could reach higher maximum active power with active rectifier than with six-pulse bridge rectifier. For this reason a mathematical model was made in Matlab/Simulink. The influence of the rectifiers with various kinds of loading was observed and compared by simulations on output variables, like line-to-line voltage and active power. The simulations were also compared with measurement.
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High power traction converters
Žižka, Pavel ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
This master thesis is based on realization of the previous university project, design of locomotive reconstruction and solving accompanying problems. In this thesis there are described all parts of a converter. The end of thesis involved theory about driver circuits of power transistors IGBT. Nowadays is still more often to think about reconstruction of the old technology rather than design a complete new construction. Investors take this decision from the financial reasons and because to the old technology designer can add only the converter. In this instant we talk about electrical locomotive, there should be kept a supply transformer and a driving unit (DC engine). The aim of this thesis is to design the converter between these two basic parts. The converter must taking the quasi-sinusoidal current which is in the phase with the input voltage, also must be able to control the engine and recuperate energy back to the network. For realization of these conditions, the converter must contain the active rectifier working in the DC-link and from which the step-down DC/DC converter is fed. Converter output is connected to the driving unit. The digital control of the power transistors is provided by processor MOTOROLA DSP56F. The control impulses, switching the power transistors, go through the driver circuits to transistors. All problems are described in the following text.
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