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中文摘要：
提出了一种能够有效减小混合箝位多电平逆变器母线电容冲击电流的PWM控制方法。首先分析了三相混合箝位型多电平逆变器拓扑的工作原理，寻找出了直流母线电容中冲击电流的产生机理。然后，提出了一种改进的PWM控制方法，该方法对三相桥臂的箝位开关载波过渡线段选择不同的相位，可以降低电容的电压纹波，从而明显减小了电容冲击电流，同时不影响输出电压质量。进一步对载波过渡线段的时间基准进行了最优数学求解，以实现冲击电流幅值的最小。最后通过Saber仿真软件以及搭建的样机模型验证了所提PWM控制方法的有效性。
英文摘要：
The operating principle of three-phase hybrid-clamped multilevel inverter is analyzed and the cause of its DC-bus capacitor surge current is researched,for which,a method of pulse width modulation control is proposed to reduce the surge current. Without impacting the quality of output voltage,different transitional line phases of carrier are selected for the clamping switches of three-phase bridge arms to greatly reduce the surge current of DC-bus capacitor due to its reduced voltage ripple. The optimum position of transitional lines is calculated to obtain the smallest surge current. The effectiveness of the proposed method is verified by the simulation with Saber and the experiments with a prototype.
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