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Unified zero-current-transition tech...

Li, Yong.

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Unified zero-current-transition techniques for high-power three-phase PWM inverters.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Unified zero-current-transition techniques for high-power three-phase PWM inverters./
作者:	Li, Yong.
面頁冊數:	287 p.
附註:	Chairman: Fred C. Lee.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3047985
ISBN:	0493622306

Unified zero-current-transition techniques for high-power three-phase PWM inverters.
Li, Yong.

Unified zero-current-transition techniques for high-power three-phase PWM inverters. - 287 p.

Chairman: Fred C. Lee.

Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2002.

This dissertation is devoted to a unified and comprehensive study of zero-current-transition (ZCT) soft-switching techniques for high-power three-phase PWM inverter applications. Major efforts in this study are as follows: (1) Conception of one new ZCT scheme and one new ZCT topology; (2) Systematic comparison of a family of ZCT inverters; (3) Design, implementation and experimental evaluation of two 55-kW prototype inverters for electric vehicle (EV) motor drives that are developed based on the proposed ZCT concepts; and (4) Investigation of the ZCT concepts in megawatts high-frequency power conversions. The proposed ZCT techniques are also applicable to three-phase power-factor-correction (PFC) rectifier applications.

ISBN: 0493622306Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Unified zero-current-transition techniques for high-power three-phase PWM inverters.
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245 1 0 $a Unified zero-current-transition techniques for high-power three-phase PWM inverters.
300 $a 287 p.
500 $a Chairman: Fred C. Lee.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1493.
502 $a Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2002.
520 $a This dissertation is devoted to a unified and comprehensive study of zero-current-transition (ZCT) soft-switching techniques for high-power three-phase PWM inverter applications. Major efforts in this study are as follows: (1) Conception of one new ZCT scheme and one new ZCT topology; (2) Systematic comparison of a family of ZCT inverters; (3) Design, implementation and experimental evaluation of two 55-kW prototype inverters for electric vehicle (EV) motor drives that are developed based on the proposed ZCT concepts; and (4) Investigation of the ZCT concepts in megawatts high-frequency power conversions. The proposed ZCT techniques are also applicable to three-phase power-factor-correction (PFC) rectifier applications.
520 $a In order to minimize switching losses, this work first proposes a new control scheme for an existing three-phase ZCT inverter circuit that uses six auxiliary switches. The proposed scheme, called the six-switch ZV/ZCT, enables all main switches, diodes and auxiliary switches to be turned off under zero-current conditions, and in the meantime provides an opportunity to achieve zero-voltage turn-on for the main switches. Meanwhile, it requires no modification to normal PWM algorithms. Compared with existing ZCT schemes, the diode reverse-recovery current is reduced significantly, the switching turn-on loss is reduced by 50%, the resonant capacitor voltage stress is reduced by 30%, and the current and thermal stresses in the auxiliary switches are evenly distributed.
520 $a However, a big drawback of the six-switch ZV/ZCT topology, as well as of other types of soft-switching topologies using six auxiliary switches, is the high cost and large space associated with the auxiliary switches. To overcome this drawback, this work further proposes a new three-phase ZCT inverter topology that uses only three auxiliary switches—the three-switch ZCT. The significance of the proposed three-switch ZCT topology is that, among three-phase soft-switching inverters developed so far, this is the only one that uses <italic>fewer</italic> than six auxiliary switches and still has the following three features: (1) soft commutation for all main switches, diodes and auxiliary switches in all operation modes; (2) no modification to normal PWM algorithms; and (3) in practical implementations, no need for extra resonant current sensing, saturable cores, or snubbers to protect the auxiliary switches. (Abstract shortened by UMI.)
590 $a School code: 0247.
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650 4 $a Engineering, Mechanical. $3 783786
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