三电平NPC逆变器中点电位平衡的软件算法  

Method of the Neutral-point Balancing in the Three-level NPC Inverter

作　　者：罗永吉[1] 尹华杰[1] 周艳青[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《电气传动》2008年第5期3-7,共5页Electric Drive

基　　金：国家自然科学基金资助项目(批准号50777022)

摘　　要：中点电位平衡问题是三电平NPC逆变器的一个固有问题。介绍了三电平NPC逆变器的重要的中点电位平衡控制方法。基于空间矢量PWM法介绍了适用于普通调制和适用于高调制系数的方案。基于注入零序电压的载波调制法介绍了一种全面、准确的控制方案和针对GTO的最小开通时间的控制方案。最后介绍了与具体的PWM调制模式分离的一种新型的滞环控制法。The neutral-point balancing is an inherent problem of the three-level NPC inverter. The most important control strategies was presented. First, the methods based on SVPWM for the normal modulation and the high modulation index were introduced. Then, a full and accurate control based on carrier and a measure considered the minimumn on-time of GTO were illustrated. Last, a new hysteresis-band control being independent of PWM mode was explained.

关 键 词：三电平NPC逆变器 中点电位平衡 脉宽调制 

分 类 号：TM464[电气工程—电器]