中文摘要：

传统三电平空间矢量脉宽调制(SVPWM)算法中扇区分割多为三角形和六边形，扇区判断计算复杂，且采用七段式开关序列，开关频率较大。为此，提出了一种新的三电平逆变器SVPWM控制算法，利用新的空间矢量类六边形进行扇区分割减少扇区判断的复杂性，采用新的四段式开关序列降低开关频率。仿真结果表明，在开关频率降低的情况下总谐波失真(THD)降低，且该算法的系统运行计算时间较短。

英文摘要：

In the traditional three-level space vector pulse width modulation(SVPWM)algorithm,the sector judgment is computationallycomplex since the sector is divided into triangles and hexagons.In addition,the switching frequency is high becausethe seven-segment switching sequence is adopted.For this reason,a new SVPWM control algorithm for three-level inverteris proposed,in which the sector judgment is simplified by dividing the sector into quasi hexagons?and the new four-segmentswitching sequence is adopted to reduce the switching frequency.Simulation results show that the total harmonic distortiongrows down with the switching frequency decreasing,moreover,the algorithm runtime is also decreased.