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2 Przegląd Elektrotechniczny
1 Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
1 Scientific Papers of The Institute of Electrical Machines, Drives and Measurements of the Wrocław University of Science and Technology Series: Studies and Research

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Simulation Models of Power Rectifiers in the EMTP-ATP Software

Kocman S., Orság P., Sobota P.

Przegląd Elektrotechniczny

2014

R. 90, nr 8

71-74

The paper presents results of computer simulations of 6-pulse, 12-pulse and 18-pulse power rectifiers and their comparison to results from experimental measurements. To analyze their behaviour under various voltage quality conditions, simulation models have been developed using program EMTP-ATP. Performed simulations and measurements demonstrate a high effectiveness of the harmonic elimination of multi-pulse rectifiers. Nevertheless, it is affected by the quality of the supply voltage at the point of rectifier coupling as it is shown in the paper.

Zaprezentowano rezultaty komputerowej symulacji 6-, 12- i 18-pulsowego prostownika mocy oraz przedstawiono porównanie wyników symulacji z eksperymentem. Do symulacji yżto program EMTP-ATP.

Analyses of Behaviour of Induction Motor Supplied from Unbalanced Source

Kocman S., Orság P., Šmída J.

Przegląd Elektrotechniczny

2013

R. 89, nr 5

213-217

The paper presents results of experimental measurements and computer simulations of an induction motor supplied from a programmable power source enabling an arbitrary adjusting of voltage quality on its output terminals. The tested motor was supplied under chosen levels of voltage unbalance to analyse some of its parameters. Motor simulation model has been also developed using the program EMTP-ATP to compare some its results to results obtained from experimental measurements.

W artykule zaprezentowano wyniki badań eksperymentalnych oraz rezultaty symulacji komputerowej silnika indukcyjnego zasilanego z programowanego źródła mocy umożliwiającego ustawianie dowolnej jakości napięcia.

The influence of the voltage unbalance and voltage variations on operation characteristics of an electrical drive with an induction motor

Orság P., Kocman S.

Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały

2013

Vol. 69, nr 33

308--320

Induction motors are the most widespread types of electrical motors in electrical drives. Their main advantages include high reliability, simple construction and corresponding nearly maintenance-free, and the possibility to feed them from the common AC power network. To control their speed, frequency converters are widely used in structures of adjustable speed drives. This paper deals with the influence of voltage unbalance and voltage variations in the supply network on operation characteristics of a tested adjustable speed drive with an induction motor and a frequency converter. Supply voltage parameters were adjusted using a programmable power source Pacific 3120AMX. Monitored drive parameters were computed from measured signals and depicted in graphs. Calculated parameter dependencies have confirmed an increase in the input current drive distortion and changes in its harmonic spectrum caused by an unbalance of the supply voltage, and only moderate influence of voltage variations on efficiency of drive components and total drive efficiency.