《Table 4 Switching sequences in region 5》

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《基于虚拟空间矢量脉宽调制的三电平逆变器中点电位平衡控制策略（英文）》

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As known from Table 2，when the reference vector is in region 5for the traditional VSVPWM，there is no a pair of redundant small vector in the switching sequence.Therefore，the neutral-point potential that has been shifted cannot be balanced by introducing the distribution factor.The paper proposes that the neutral-point potential in region 5can be controlled by selecting the appropriate sequence.