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基于载波的三电平中点电压平衡控制策略

, PP. 172-177

Keywords: 三电平逆变器,中点电压平衡,载波变幅,SPWM

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Abstract:

中点电压平衡问题是二极管钳位式三电平逆变器的固有问题,本文对此进行了深入探讨,分析了中点电压失衡的原因,从载波的角度研究了载波幅值变化对中点电压的影响,推导出中点电压波动和调制比、调节量、功率因数之间的关系,讨论了调节量、功率因数对中点电压波动的影响,提出了一种基于载波变幅的SPWM调制策略,通过保持调制波不变,改变载波的幅值来实现中点电压平衡控制。最后在基于DSP的二极管钳位型三电平逆变器试验平台上验证了上述调制方案的有效性。

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