An improved SVPWM control algorithm for three-level inverter

HUANG Xiao-feng, WANG Xiao-peng, SUN Chun-xia

（School of Electronics & Information Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China）

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

Key words： three-level inverter; space vector pulse width modulation (SVPWM); sector determination; switching sequence

CLD number： TM464Document code： A

Article ID： 1674-8042（2017）03-0277-06  doi： 10.3969/j.issn.1674-80422017-03-011

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一种改进的三电平逆变器SVPWM控制算法

黄晓峰， 王小鹏， 孙春霞

（兰州交通大学 电子与信息工程学院，  甘肃 兰州 730070）

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。

关键词： 三电平逆变； 空间矢量脉宽调制（SVPWM)； 扇区分割； 开关序列

引用格式：HUANG Xiao-feng, WANG Xiao-peng, SUN Chun-xia.  An improved SVPWM control algorithm for three-level inverter. Journal of Measurement Science and Instrumentation, 2017, 8(3)： 277-282. ［doi： 10.3969／j.issn.1674-8042.20170311］

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