• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Unified zero-current-transition techniques for high-power three-phase PWM inverters.
【24h】

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

机译：用于大功率三相PWM逆变器的统一零电流转换技术。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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.; 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.; 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 fewer 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.)
机译：本文致力于对大功率三相PWM逆变器应用中的零电流转换（ZCT）软开关技术进行统一而全面的研究。本研究的主要工作如下：（1）构想一种新的ZCT方案和一种新的ZCT拓扑; （2）一系列ZCT逆变器的系统比较; （3）根据提出的ZCT概念开发的两个用于电动汽车（EV）电机驱动的55 kW原型逆变器的设计，实施和实验评估; （4）在兆瓦级高频功率转换中对ZCT概念的研究。所提出的ZCT技术也适用于三相功率因数校正（PFC）整流器应用。为了最小化开关损耗，这项工作首先针对使用六个辅助开关的现有三相ZCT逆变器电路提出了一种新的控制方案。所提议的方案称为六开关ZV / ZCT，它使所有主开关，二极管和辅助开关都可以在零电流条件下关断，与此同时也为实现主开关零电压导通提供了机会。开关。同时，它不需要修改常规的PWM算法。与现有的ZCT方案相比，二极管的反向恢复电流大大降低，开关导通损耗降低了50％，谐振电容器的电压应力降低了30％，辅助开关中的电流和热应力为平均分配。;但是，六开关ZV / ZCT拓扑以及使用六个辅助开关的其他类型的软开关拓扑的一大缺点是与辅助开关相关的高成本和大空间。为了克服这个缺点，这项工作进一步提出了一种新的三相ZCT逆变器拓扑，该拓扑仅使用三个辅助开关-三开关ZCT。提出的三开关ZCT拓扑的意义在于，在迄今为止开发的三相软开关逆变器中，这是唯一使用少于六个辅助开关且仅使用以下三个辅助开关的逆变器。特点：（1）在所有工作模式下对所有主开关，二极管和辅助开关进行软换向; （2）不对常规PWM算法进行修改; （3）在实际实现中，不需要额外的谐振电流感应，可饱和的磁芯或缓冲器来保护辅助开关。 （摘要由UMI缩短。）

著录项

  • 作者

    Li, Yong.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Engineering Electronics and Electrical.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 287 p.
  • 总页数 287
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;机械、仪表工业;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号