In this paper, space vector pulse width modulation technique is proposed to reduce the common-mode voltage (CMV) of a five-phase three-level neutral point clamped inverter. The switching pulses are generated by tracking the reference vector in the complex hexagonal region. The switching state vectors are selected for switching pulse generation, which have minimum CMV level. Totally, it consists of 243 switching state vectors; in that, 116 switching states are used to minimize the CMV level and to obtain the desired output voltage levels. And no additional algorithm or techniques are required to minimize the CMV level. Also, this method uses the redundant switching state vectors, which leads to minimizing the capacitor voltage unbalancing, THD minimization and neutral current reduction in the system without making any modification from the control. So for three-level inverter, the CMV is reduced up to V dc /6 times of input voltage; in this system, an attempt is made to reduce the CMV level below this reported value. This proposed system’s results are compared with those of conventional PWM methods. The simulation and hardware results are verified using MATLAB Simulink and FPGA controller, respectively.

中文翻译：

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使用SVPWM策略最小化五相三电平NPC逆变器的共模电压

在本文中，提出了空间矢量脉宽调制技术来降低五相三电平中性点钳位逆变器的共模电压（CMV）。通过跟踪复六边形区域中的参考矢量来生成开关脉冲。开关状态向量被选择用于开关脉冲生成，其具有最小 CMV 电平。总共由243个开关状态向量组成；其中，116 个开关状态用于最小化 CMV 电平并获得所需的输出电压电平。并且不需要额外的算法或技术来最小化 CMV 水平。此外，该方法使用冗余开关状态向量，从而最大限度地减少系统中的电容器电压不平衡、THD 最小化和零线电流降低，而无需对控制进行任何修改。所以对于三电平逆变器，CMV 降低到V dc /6 倍输入电压；在该系统中，尝试将 CMV 水平降低到低于该报告值。该系统的结果与传统 PWM 方法的结果进行了比较。仿真和硬件结果分别使用 MATLAB Simulink 和 FPGA 控制器进行验证。