60°坐标系下三电平逆变器SVPWM控制策略研究  

Study on SVPWM method based on 60° coordinate system for three-level inverter

作　　者：陈晓鸥[1] 许春雨[1] 王枫明[1] CHEN Xiao-ou XU Chun-yu WANG Feng-ming(College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Chin)

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024

出　　处：《电工电能新技术》2017年第2期43-49,共7页Advanced Technology of Electrical Engineering and Energy

基　　金：教育部博士点基金项目(20101402120004)

摘　　要：为解决二极管箝位型三电平逆变器直角坐标系下SVPWM算法复杂、计算量大的问题,本文采用60°坐标系对控制算法进行了改进。建立g-h坐标系,分析了参考矢量与空间坐标的关系,提出了参考电压矢量标幺变换的算法,简化了判断扇区方法,计算第Ⅰ扇区电压矢量的作用时间;建立了系统旋转模型,将其他扇区电压矢量对应到第Ⅰ扇区,直接读取矢量作用时间,简化了运算流程,避免了进行大量的三角函数运算。Matlab仿真和实验结果验证了本方法的可行性。For the neutral point clamped three-level inverter, a new method for SVPWM based on 60 ° coordinate system can effectively avoid the shortcomings of complex algorithm, and the large amount of calculation which exist in space vector pulse width modulation （SVPWM） method in α-β coordinate system. In this paper, following measures are put forward, namely, 60° coordinate system is adopted to improve the control algorithm, g-h coordi-hate system is established, the relationship between the reference vectors and space coordinates is analyzed, the algorithm of per-unit transformation of the basic voltage vector is proposed, the judgment of sectors is simplified, and acting time of the voltage vectors in sector I is calculated. The rotation module is established, and reference voltage vectors in other sectors are rotated to sector I , acting time of the voltage vectors is obtained directly, so the operation process is simplified and a lot of trigonometric function calculations are avoided. Based on the Matlab simulation model and experiment, the reliability of the improvement measures is verified, and the response speed of the system becomes quicker.

关 键 词：三电平逆变器 60°坐标系 SVPWM算法 标幺变换 

分 类 号：TM464[电气工程—电器]