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三电平SVPWM与CBPWM算法的内在联系研究

, PP. 19-26

Keywords: 空间矢量脉宽调制,载波脉宽调制,三电平,调制函数

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Abstract:

由于三电平中点钳位逆变器能有效提高逆变器系统容量和耐压水平,减少输出电压的谐波,所以其在中高压大容量电能变换领域中得到了广泛应用。为了揭示三电平中点钳位逆变器空间矢量脉宽调制(SVPWM)和载波脉宽调制(CBPWM)算法的内在联系,本文首先分析了三电平SVPWM算法的原理,并根据调制度的大小将整个线性调制范围分为3段,然后根据脉宽调制的规则采样法,分别推导出了3个调制段内与SVPWM等效的CBPWM调制函数形式。理论研究表明三电平SVPWM算法是一种特殊形式的CBPWM算法。最后仿真和实验结果证明了理论分析的正确性和有效性。

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