Pomorstvo, Vol. 19 No. 1, 2005.
Izvorni znanstveni članak
THE INFLUENCE OF SERIAL INDUCTANCE ON THE DECREASE OF CURRENT HARMONIC DISTORTION OF LINE COMMUTATED FREQUENCY CONVERTERS IN ELECTRIC PROPULSION SYSTEM OF SHIPS
Dubravko Dubravko
IVan Vučetić
Sažetak
Serial inductance is a total inductance located between the static converter and the EMF source. Serial inductance is the only way for a reduction of the whole primary current harmonic spectrum of line commutated frequency converters. Because the mitigation effect of serial inductance on the harmonics of higher order is much greater than on the seventh and especially on the fifth harmonic, it is well suited with 12-pulse converters. Serial inductance decreases the power factor and therefore increases power losses on the fundamental harmonic. Voltage drop on serial inductance decreases voltage and power of the frequency converter. With lower values of the serial inductance, power losses increase and power reductions are relatively small in comparison with the noticeable mitigation of current harmonics. With higher values of serial inductance the situation is quite opposite. In order to maintain frequency converter power, the transformation ratio of propulsion transformers has to be reduced. The consequence is higher voltage on electronic switches and therefore a more expensive converter.
Ključne riječi
AC line reactance; harmonics; frequency converter; electric propulsion
Hrčak ID:
3946
URI
Datum izdavanja:
1.12.2005.
Posjeta: 4.083 *