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Novel DC-rail soft-switched three-phase voltage-source inverters

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6 Author(s)
Kunrong Wang ; Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA ; Yimin Jiang ; S. Dubovsky ; Guichao Hua
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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

Published in:

IEEE Transactions on Industry Applications  (Volume:33 ,  Issue: 2 )