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Identifikace vírových struktur z experimentálních dat
Šonský, Jiří ; Něnička, Václav ; Jágerská, J.
For identification of vortex structures of a heat flow in a free burning plasma jet a new method is used, which utilize fast imaging methods and computerized image processing. This method allows us to observe genesis of vortexes of a heat flow in a plasma jet, including the changes when a wall barrier is inserted in the jet. These two regimes are typical for behaviour of a plasma jet in technological applications. By varying the flow rate of working gas (argon, 15slm to 150 slm) there appear considerable changes both in time and spatial distribution of vortex fields in the two above regimes
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Some Aspects of Matrix Converter System Realization
Lettl, Jiří ; Flígl, S.
Matrix converters, initially called direct frequency changers in general only, have attracted an amount of interest over the past twenty-five years already, but with the rapid progress in the semiconductor devices and control circuits they find once again new utilisation. The presented paper deals with the recent concept of hybrid and power splitting traction drive systems.
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Control Strategy of Parallel Hybrid Filter for Harmonic Mitigation
Škramlík, Jiří ; Valouch, Viktor
The strategy features a small sensitivity against a disturbed supply voltage system and enables us to set grid phase currents in the phase with respective voltages. The expected properties of the PHF control system have been confirmed by experimental tests in the laboratory. The data show that the modified control strategy yields better results than those obtained by using control systems reported previously, especially in case of an unsymmetrical and non-sinusoidal voltage system and the demand of zero reactive power withdrawn from the grid.
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