针对三电平逆变器固有的中点电位平衡问题，本文提出并分析了两种能控制中点电位平衡的控制策略。
Two methods to control the neutral point potential are proposed in this thesis which can solve the neutral point potential problem owned by three-level inverter.
中点电位平衡问题是三电平npc逆变器的一个固有问题。
The neutral-point balancing is an inherent problem of the three-level NPC inverter.
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