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A voltage space approach to developing a soft-switched inverter topology with low device voltage stress.

机译：一种电压空间方法，用于开发具有低器件电压应力的软开关逆变器拓扑。

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摘要

Scope and method of study. The purpose of this research was to develop a soft-switched inverter topology with substantially lower device voltage stress than resonant link topologies, which effectively comprise the entirety of soft-switched inverter technology. The premise of the study was that an inverter's topological structure imposes restrictions on the trajectories that its output voltage can traverse in voltage space and that these restrictions are directly related to key performance characteristics, such as device voltage stress and output waveform distortion. Techniques were devised to describe the output voltage trajectories of a generalized bridge-based inverter in terms of a finite set of primitive trajectory components. Analytical methods were developed for computing device voltage stress and certain output waveform quality metrics for a given inverter based on the subset of these primitive trajectory components allowed for the inverter's specific topological structure. These techniques and methods were used to synthesize a new soft-switched inverter with a predicted voltage stress level well below that of resonant link topologies. Modeling and simulation were used to evaluate the proposed inverter and to compare its performance characteristics to those of a leading resonant link inverter design.; Findings and conclusions. Analysis of resonant link topologies showed that a direct relationship exists between device voltage stress and the lower cutoff frequency of the output waveform distortion that exists when the inverter is synthesizing a static three-phase voltage. This was shown to result from the absence of specific primitive trajectory components that are available to conventional hard-switched inverters. The new inverter topology proposed in this work, which is capable of executing these trajectories, was shown to have the same low device stress level as a conventional hard-switched inverter. The addition of these primitive trajectories also increased the effective switching frequency by up to 50% over resonant link designs. Simulation results showed the proposed inverter to have 66.7% of the device voltage stress and 60% or less of the load current distortion seen for the leading resonant link design.
机译：研究范围和方法。这项研究的目的是开发一种软​​开关逆变器拓扑，其器件电压应力要比谐振链路拓扑低得多，该拓扑有效地构成了软开关逆变器技术的整体。研究的前提是，逆变器的拓扑结构会限制其输出电压可以在电压空间中穿越的轨迹，并且这些限制与关键的性能特征（例如器件电压应力和输出波形失真）直接相关。设计了一些技术，用于根据有限的原始轨迹分量集来描述广义基于桥的逆变器的输出电压轨迹。基于用于逆变器特定拓扑结构的这些原始轨迹分量的子集，开发了用于为给定逆变器计算设备电压应力和某些输出波形质量度量的分析方法。这些技术和方法用于合成新的软开关逆变器，其预测的电压应力水平远低于谐振链路拓扑的水平。通过建模和仿真来评估所提出的逆变器，并将其性能特征与领先的谐振链路逆变器设计进行比较。 发现和结论。谐振链路拓扑的分析表明，当逆变器合成静态三相电压时，器件电压应力与输出波形失真的下限截止频率之间存在直接关系。结果表明，这是由于缺乏传统的硬开关逆变器可用的特定原始轨迹分量而导致的。这项工作中提出的能够执行这些轨迹的新型逆变器拓扑结构，与传统的硬开关逆变器具有相同的低器件应力水平。这些原始轨迹的添加也使有效开关频率比谐振链路设计提高了50％。仿真结果表明，对于领先的谐振链路设计，建议的逆变器具有66.7％的器件电压应力和60％或更少的负载电流失真。

著录项

  • 作者

    McClelland, Bradley Scott.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 365 p.
  • 总页数 365
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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