The computational complexity of the three-level space vector pulsewidth modulation (SVPWM) limits its application in high-switching-frequency converters. To address this issue, this article proposes a simplified SVPWM algorithm based on virtual chopping. First, the reference voltage vector (VV) is adjusted to avoid excessive line-to-line voltage jumps. Second, boundary VVs in the space vector diagram, with simple switching sequences, are chosen as standards. Third, the switching sequence of the reference VV is determined by virtual chopping the corresponding standard VV’s. Furthermore, to generate it in the microcontroller, the corresponding modulation waves are obtained. Finally, a method to balance dc-side capacitor voltages is proposed. Consequently, the proposed algorithm simplifies the process, requiring only four equations. The sector determination, dwell time calculation, and allocation are bypassed. Compared with the existing algorithms, the execution time and design complexity of the proposed algorithm in the microcontroller is reduced. The experimental results are presented to verify its effectiveness.

中文翻译：

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基于虚拟斩波的三电平NPC变换器简化SVPWM算法


三电平空间矢量脉宽调制（SVPWM）的计算复杂性限制了其在高开关频率转换器中的应用。针对这个问题，本文提出了一种基于虚拟斩波的简化SVPWM算法。首先，调整参考电压矢量（VV）以避免过多的线间电压跳变。其次，选择空间矢量图中具有简单切换序列的边界VV作为标准。第三，通过虚拟斩波对应的标准VV来确定参考VV的切换顺序。此外，为了在微控制器中生成它，获得相应的调制波。最后提出了一种平衡直流侧电容电压的方法。因此，所提出的算法简化了过程，仅需要四个方程。扇区确定、停留时间计算和分配被绕过。与现有算法相比，所提出的算法在微控制器中的执行时间和设计复杂度降低了。给出实验结果来验证其有效性。