非对称结构功率单元串联多电平变频调速系统

Asymmetry Structure Power Cell Cascade Multilevel Medium Voltage Inverters

介绍了一种非对称结构功率单元串联多电平变频调速系统,其主体结构采用单元串联级联方式,每个单元采用非对称结构的三电平方式构建,介绍了几种功率单元的几种拓朴结构以及整机的控制算法。采用此结构可以用低压器件解决高压变频问题,同时还可以使系统的结构大为简化,系统输出谐波减小。最后给出了系统实际运行的结果。

A kind of asymmetry structure power cell cascade multilevel medium voltage inverters was introduced. The mainframe adopts cascade multilevel technology, the power cells adopt asymmetry structure NPC topology. The control strategy was given. By this technology, we can construct high voltage inverters using normal power modules, by the mean time the structure of the devices can be greatly simplified and the output THD can be reduced. At the end of the paper the accurate output line-to-line and line-to-neutral voltage of the inverter are presented.