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单级可升压逆变电路统一拓扑:电抗源逆变电路

DOI: 10.13334/j.0258-8013.pcsee.2015.19.022, PP. 5030-5038

Keywords: 单级可升压逆变器,电抗源变换器,升-降压变换器,Z源逆变器,准Z源逆变器

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Abstract:

在对Z源逆变器(Z-sourceinverter,ZSI)和准Z源逆变器(quasi-Z-sourceinverter,qZSI)等单级可升压逆变电路进行深入研究的基础上,提出单级可升压逆变电路统一拓扑结构——电抗源变换器。该拓扑利于独特的LC组合形式实现了电压源和电流源电路无法实现的功能。以电抗源逆变器(reactancesourceinverter,XSI)为例阐述该拓扑结构的构成特征、工作原理、推演途径等共性问题,提出2种推演XSI电路的方法,即DC-DC斩波电路开关管代替推演法(SR-XSI)和DC-DC斩波电路二极管代替推演法(DR-XSI)。并以现有的典型电抗源逆变器ZSI和qZSI为例,论证由“级联DC-DC斩波电路的两级电路”推演出XSI的可行性。基于DR-XSI推演机理,提出一族单级可升压逆变电路,并以Zeta电抗源逆变电路为例,研究该电路的工作原理和具体工作模式。该类单级逆变器能在较小的直通占空比Dsh时得到较高的升压功能,减少了单级逆变电路直通占空比Dsh和逆变器调制因子M之间此消彼长的制约关系。通过仿真软件Saber验证了ZetaXSI电路的升压功能以及所提各种策略的正确性和可行性。最后在实验室建立了1kW样机进行验证,实验结果和理论分析及仿真结果吻合。

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