"International Conference on Low Voltage Electrical Machines - LVEM 2011 /11./" - Výsledky hledání - Digitální repozitář

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	Transient Behavior of Active Front-End Rectifier under Unbalanced Voltage Supply Chomát, Miroslav ; Schreier, Luděk ; Bendl, Jiří Operation of voltage-source inverter supplied with unbalanced system of voltages is investigated in the paper. This situation can lead to problems in operation of an electric drive as voltage pulsations can arise in the DC-bus. Suitable kontrol methods may be applied to eliminate this effect in the aktive front-end rectifier. The paper particularly focuses on transient processes that accompany operation of the drive. They can be caused by changes in control of the drive, changes in load, or changes in the supply voltages. Úplný záznam
	Influence of Third Space Harmonic on Properties of Five-Phase Induction Machine Schreier, Luděk ; Chomát, Miroslav ; Bendl, Jiří The paper deals with the necessity to consider higher space harmonic waves of a current layer, magnetic flux density and yoke flux in a five-phase induction motor fed from a tenpulse frequency converter. It is shown that especially the third space harmonic influences currents and torque of the machina considerably. The influence depends on connection arrangements of the converter and stator of the five-phase induction machine. Theoretical results are verified by experimental measurements. Úplný záznam
	New Hybrid Power Filter Topology and Control for Application in Industrial Networks Pecha, I. ; Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor The paper presents the new structure and control strategy of the Hybrid Power filter (HPF) with a split passive part. Its impedance is divided into two parts tuned to 50Hz and 250 Hz. The HPF topology is very efficient to mitigate harmonic currents especially for higher frequencies. The HPF functionality is influenced by the grid inductance changes only negligibly. The new HPF characteristics were compared with those for a standard HPF and a classic passive compensation by the simulation done in the Matlab/Simulink environment. The voltage and current values and their harmonic spectra were also measured in the real industrial plant Remarkplast, Ltd. under different conditions. Úplný záznam

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