Title :
Novel DC-rail soft-switched three-phase voltage-source inverters
Author :
Wang, Kunrong ; Jiang, Yimin ; Dubovsky, Stephen ; Hua, Guichao ; Boroyevich, Dushan ; Lee, Fred C.
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
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
Keywords :
DC-AC power convertors; PWM invertors; bipolar transistor switches; field effect transistor switches; insulated gate bipolar transistors; power MOSFET; power bipolar transistors; power field effect transistors; power semiconductor switches; switching circuits; 400 V; 62.5 kHz; 93 percent; DC-rail soft-switching; ZCS; ZVS; efficiency; modified space-vector modulation; power density; switching frequencies; three-phase PWM VSI; Costs; Insulated gate bipolar transistors; Pulse width modulation converters; Pulse width modulation inverters; Space vector pulse width modulation; Switches; Switching frequency; Switching loss; Topology; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
