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变虚拟空间矢量的三电平NPC变换器中点电位平衡控制策略

DOI: 10.13334/j.0258-8013.pcsee.2015.19.020, PP. 5013-5021

Keywords: 三电平,中点钳位型变换器,空间矢量脉宽调制,虚拟空间矢量脉宽调制,变虚拟空间矢量脉宽调制,电压平衡

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Abstract:

在多电平变换器研究领域,三电平中点钳位逆变器目前是一种研究比较广泛的一种拓扑结构,但是此拓扑结构容易造成中点电压偏移问题。基于理论上虚拟空间矢量的调制方法可以实现分压电容中点电压平衡控制,因此,为增强中点电压平衡的控制效果,提出调节虚拟中矢量中点电流和分配正、负小矢量作用时间的中点电压平衡控制方法。相对虚拟空间矢量脉宽调制算法和混合式调制算法来说,所采用的可变虚拟空间矢量控制算法简单、实用,能实现三电平NPC变换器中点电位平衡控制。

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