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改进型双向Z源储能变流器拓扑结构及空间电压矢量调制策略

DOI: 10.13336/j.1003-6520.hve.2015.10.008, PP. 3240-3248

Keywords: Z源,变流器,轻载,双向流动,电压畸变,空间电压矢量

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Abstract:

针对传统Z源逆变器电容电压应力高、启动冲击电流大、存在非正常工作状态、能量无法双向流动等缺点,提出了一种改进高性能双向Z源变流器拓扑。将改进型Z源逆变器中的二极管用一个带有反并联二极管的全控开关代替,通过对全控开关的控制,使Z源电感中的电流可反向流动,电感电压始终被钳位在电容电压,进而消除传统和改进型Z源逆变器在小电感或轻载下出现的非正常工作状态,保持直流链电压稳定。此外,控制电感电流的反向流动还可实现能量由交流侧向直流侧回馈。在理论分析的基础上,提出了一种改进型空间电压矢量调制策略。仿真结果表明,所提拓扑的电容电压应力和启动冲击电流比传统拓扑的更小,可在纯无功负载下运行,并可实现能量的双向流动。

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