《Table 2 Switching sequences of vectors in sectorⅠ》

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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 1，the vectors V0，VL1and VL2 do not affect the neutral-point potential.Since the switching period TSis very short，the three-phase current can be considered a constant value during a switching cycle[6].When the three-phase current satisfies ia+ib+ic=0，the action time of VMis equally distributed to its three component vectors，which can ensure that the charge flowing out of the neutral-point within one switching cycle is zero，thus it will not affect the neutral-point potential.Similarly，VS1and VS2 also do not cause potential shifts by dividing the action time equally.