Operation of inverter equipment with a DC supply containing low frequency ripple - an analysis of input impedance
Operation of inverter equipment with a DC supply containing low frequency ripple - an analysis of input impedance
- Neue Suche nach: Niiranen, J.
- Neue Suche nach: Niiranen, J.
Inverter-fed cage induction motor traction drives are gaining popularity in all kinds of vehicles. However, the possibility of interference with the existing signalling equipment is an often encountered question. One aspect in this field is the impedance of the drive, which for its part determines harmonic current levels caused by the supply station dc voltage ripple. In this thesis the expressions for the impedance are derived and a comparison with the measurements is made. Means of increasing the impedance level are presented. Especially frequency modulation (FM) of the inverter frequency is examined. Frequency modulation is shown to prevent the rectification of low frequency ripple components in the inverter, which cause subharmonics in the motor current. It turned out that frequency modulation does not increase the impedance level much. However, considerable savings can be achieved in vehicles fed by a single phase ac supply, because in most cases the heavy second harmonic filter can be omitted.
Dokumentinformationen
Operation of inverter equipment with a DC supply containing low frequency ripple - an analysis of input impedance
Das Verhalten von Stromrichtern für Asynchronmotoren bei Speisung aus einem oberwellenhaltigen Gleichstromnetz - eine Analyse der Stromquellen-Impedanz
1989
123 Seiten, 49 Bilder, 2 Tabellen, 34 Quellen
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Englisch