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带抽头电感的准Z源逆变器建模与特性分析

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Keywords: 抽头电感,准Z源逆变器,小信号模型,闭环控制

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Abstract:

近年来,Z源逆变器、准Z源逆变器的提出解决了传统电压源逆变器在应用中的诸多局限,受到了很大的关注,但拓扑本身的一些不足也限制了其进一步的发展。本文对一种带抽头电感的准Z源逆变器进行研究,通过分析其各种工作模态,发现该拓扑具有更高的升压能力,更小的电容电压应力;本文使用状态空间平均法,提出了该类阻抗源逆变器拓扑的一般化直流侧小信号模型,并根据控制量与输出量之间的传递函数,分析了升压网络参数及直通占空比变化对系统的影响;同时设计了闭环调节器,相较于Z源逆变器、准Z源逆变器,其动态性能得到了提高。最后通过仿真和实验验证了上述特性。

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