Semi-Z源逆变器的现有调制策略存在开关电压应力大且难以实现闭环控制的固有不足。针对以上不足,提出一种低电压应力的Semi-Z源逆变器调制策略。通过建立稳态电路模型,分析Semi-Z源电压增益和器件应力特性,对占空比进行平均化处理,进而减小开关器件电压应力。此外,针对Semi-Z源逆变器在重载及高输出交流频率的应用环境中,依然存在无源元件需求过大的问题,特别设计并提出一套高效的无源元件参数优化方案。最后,根据所提出的调制策略,设计搭建200 W试验样机,验证所提的调制策略和参数设计方案的正确性和综合性能优势。
Abstract
The Semi-Z source inverter uses fewer switching components and achieves single-stage energy conversion, making it have good application prospects. The existing modulation strategy of Semi-Z source inverters has inherent shortcomings such as high switching voltage stress and difficulty in achieving closed-loop control. In response to the above shortcomings, this article proposes a low voltage stress Semi-Z source inverter modulation strategy. By establishing a steady-state circuit model, the voltage gain and device stress characteristics of the Semi-Z source are analyzed, and the duty cycle is averaged to reduce the voltage stress of the switching device. In addition, to address the issue of large demand for passive components in Semi-Z source inverters under heavy loads and high output AC frequencies. This article provides a set of parameter optimization design methods for passive components. Finally, a 200 W experimental prototype was built based on the modulation strategy proposed in this article, verifying the correctness and comprehensive advantages of the modulation strategy and parameter design scheme proposed in this article.
关键词
逆变器 /
脉宽调制 /
电路分析 /
电压应力 /
线性控制
Key words
inverter /
pulse width modulation /
circuit analysis /
voltage stress /
linear control
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基金
国家自然科学基金（52177193）; 陕西省重点研发计划（2022GY-182）; 西安市科技计划项目（22GXFW0078）
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