A family of DC-rail soft-switched three-phase voltage-source inverters (VSIs) adopting zero-voltage-transition (ZVT) or zero-current-transition (ZCT) techniques are proposed in this paper. Adding an active switch on the DC-rail makes the implementation of the ZVT and ZCT as easy as in a single-ended DC/DC power converter, while true pulsewidth modulation (PWM) operation is achieved by a modified space-vector modulation. As a result, these inverters can run at much higher switching frequencies than the conventional hard-switched VSIs and with higher power density and efficiency. Their operation and control strategy are analyzed. Implementation and experimental results of a prototype DC-rail ZVT VSI, which is rated at 15 kVA and run at a switching frequency of 62.5 kHz, are presented. The measured efficiency with static loads reaches 93% under the input voltage of 400 V.
Novel DC-rail soft-switched three-phase voltage-source inverters
Ein neuer Dreiphasenwechselrichter für das Gleichspannungsnetz der Bahn
IEEE Transactions on Industry Applications ; 33 , 2 ; 509-517
1997
9 Seiten, 17 Quellen
Article (Journal)
English
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