基于45°坐标的H桥级联多电平变换器移相空间矢量调制算法  

Phase shift SVM for H-bridge cascaded multilevelconverter based on 45° coordinates

作　　者：王翠[1] 朱能飞 刘逸卓 WANG Cui;ZHU Nengfei;LIU Yizhuo(School of Mechanical and Electrical Engineering,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院机械与电气工程学院,江西南昌330099

出　　处：《南昌工程学院学报》2020年第1期66-73,共8页Journal of Nanchang Institute of Technology

基　　金：江西省教育厅科学技术研究项目(GJJ151128);国家自然科学基金资助项目(51667015)。

摘　　要：随着级联模块数的增加,空间矢量调制算法实现困难制约了其在高压大容量变换器中的推广应用。针对这一问题,提出基于45°坐标移相空间矢量调制算法,实现对H桥级联的多电平变换器进行控制。45°坐标系上的基本矢量位于单位整数坐标点,且相邻3个基本矢量组成的扇区三角形为等腰直角三角形,简化了参考矢量的定位及基本矢量作用时间计算;由于避免了多电平SVM算法中大量冗余开关状态矢量的计算,该算法很容易扩展应用于任意电平的H桥级联多电平变换器;与载波移相调制算法相比,移相空间矢量调制算法提高了直流电压的利用率,且比载波移相调制算法更有利于数字实现。最后,通过仿真和实验验证了本文提出的算法的正确性。With the increasing number of cascade modules,the difficulty of implementing space vector modulation(SVM)algorithm restricts it from being widely used in high-voltage large-power applications.To solve this problem,45°coordinates phase-shifted space vector modulation(PSSVM)algorithm is proposed to control H-bridge cascaded multilevel converters.The basic vectors in the 45°coordinates are located at the unit integer point,and the sector triangle composed of three adjacent basic vectors is an isosceles right triangle,which simplifies the location of reference vectors and the calculation of the duty cycles of basic vectors.Because there is no need to calculate a large number of redundant switching state vectors,this algorithm can be easily extended to H-bridge cascaded multilevel converters at any level.Compared with carrier phase-shifted modulation,PSSVM algorithm improves the utilization of DC voltage,and is more conducive to digital implementation.Finally,the correctness of the proposed algorithm is verified by simulation and experiment.

关 键 词：级联多电平变换器 H桥 空间矢量调制 移相 

分 类 号：TM42[电气工程—电器]