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基于空间矢量和特定消谐脉宽调制的三电平逆变器调制方法

, PP. 34-40

Keywords: NPC三电平逆变器,空间矢量脉宽调制,特定消谐脉宽调制,混合调制

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Abstract:

基于三电平高压逆变器中同时应用空间矢量脉宽调制(SVPWM)和特定消谐脉宽调制(SHEPWM)的混合调制方法,即高频时采用SHEPWM,低频时采用异步SVPWM,避免了低频时SHEPWM存储量变大和SVPWM在高频时谐波特性变差大的缺点,充分发挥了二者的优点,使逆变器在整个工作范围内都可以有效抑制低次谐波,得到较好的输出波形.同时为保证切换过程中电流和电压没有跳变,提出了一种使得二者之间平滑切换的方法.最后,采用PSIM对基于SHEPWM和SVPWM的混合调制方法进行了仿真研究,并在实际NPC三电平逆变器控制平台上进行了实验,对所做的理论分析进行了验证.

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