Z源三相四桥臂逆变器的三维空间矢量脉宽调制策略  

Three-Dimensional Space Vector Pulse Width Modulation Strategy for Z-Source Three-Phase Four-Leg Inverter

作　　者：杜强 陈阳琦 徐建委 DU Qiang;CHEN Yangqi;XU Jianwei(CRRC Xi’an YongeJietong Electric Co.,Ltd.,Xi’an 710000,China;State Grid Gansu Electric Power Company Economic Research Institute,Lanzhou 730070,China)

机构地区：[1]西安中车永电捷通电气有限公司,陕西西安710000 [2]国网甘肃省电力公司经济技术研究院,甘肃兰州730070

出　　处：《电机与控制应用》2019年第6期112-118,共7页Electric machines & control application

摘　　要：对Z源三相四桥臂逆变器的稳态工作原理进行了深入分析,并提出一种改进的三维空间矢量脉宽调制策略,通过合理地选择直通桥臂,将直通状态插入到传统零矢量状态中,保证不影响有效开关状态和输出电压。同时,分析了直通占空比和调制比的耦合关系,得出直通占空比的最大取值,进而提出相应的最大恒定升压控制策略。在MATLAB/Simulink中搭建Z源三相四桥臂逆变器仿真模型,并在平衡及不平衡负载工况下进行仿真。仿真结果表明:Z源三相四桥臂逆变器在所提三维空间矢量脉宽调制策略下,不仅可以实现升压控制,而且相较传统Z源三相三桥臂逆变器,在不平衡负载条件下也能取得良好的控制效果。The steady-state operation principle of Z-source three-phase four-leg inverter was analyzed,and an improved three-dimensional space vector pulse width modulation(3D-SVPWM)strategy was proposed.By properly selecting the shoot-through leg,the shoot-through states were inserted into the traditional zero-vector state on the premise that the active switching state and output voltage were not affected.At the same time,the coupling relationship between the shoot-through duty ratio and the modulation ratio was analyzed,and the maximum value of the shoot-through duty ratio was obtained.Then the corresponding maximum constant boost strategy was proposed.A simulation model of the Z-source three-phase four-leg inverter was built in MATLAB/Simulink and simulated under balanced and unbalanced load conditions.The simulation results showed that the Z-source three-phase four-leg inverter could not only achieve boost control under the proposed 3D-SVPWM strategy,but also achieve good control results under unbalanced load conditions compared with the traditional Z-source three-phase three-leg inverter.

关 键 词：Z源逆变器 三相四桥臂逆变器 三维空间矢量脉宽调制 直通 

分 类 号：TM464[电气工程—电器]