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 :
Virginia Power Electron. Center, Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
A family of DC-rail soft-switched three-phase voltage-source inverters (VSIs) adopting the 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 pulse-width-modulation (PWM) operation is achieved by a modified space-vector modulation. As a result, these inverters can run at much higher switching frequencies than conventional hard-switched VSIs, and with higher power density and efficiency. The 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; load (electric); power semiconductor switches; switching circuits; 15 kVA; 400 V; 62.5 kHz; 93 percent; DC rail; PWM; VSI; active switch; modified space-vector modulation; power density; soft-switching; static loads; switching frequencies; three-phase voltage-source inverters; zero voltage switching; Pulse width modulation; Pulse width modulation converters; Pulse width modulation inverters; Resonance; Stress; Switches; Switching converters; Switching frequency; Switching loss; Voltage;
Conference_Titel :
Industry Applications Conference, 1995. Thirtieth IAS Annual Meeting, IAS '95., Conference Record of the 1995 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-3008-0
DOI :
10.1109/IAS.1995.530635
