三电平网侧变流器预测电流控制及其与两电平变流器比较  

Predictive Current Control of Three-Level Line-Side Converter and Comparison with Two-Level Converter

作　　者：李伟[1] 张黎[1] 马志文[1] 郭晓燕[1] 

机构地区：[1]中国铁道科学研究院机车车辆研究所,北京100081

出　　处：《中国铁道科学》2008年第6期77-81,共5页China Railway Science

基　　金：铁道部科技研究开发计划项目(2007J012)

摘　　要：将预测电流控制方法从两电平推广至三电平,对三电平系统中需要注意的脉宽调制方法、中点电位平衡等进行研究,提出适合三电平的预测电流控制策略。通过计算机仿真,对两电平和三电平系统采用同样的控制方法进行模拟,仿真结果说明预测电流控制同样可以应用于三电平网侧变流器,且能够保证中点电位的平衡。在相同条件下与两电平系统相比,三电平系统要求的器件耐压和网侧谐波含量更小,适合用于高压大容量的电力牵引传动系统。Predictive current control （PCC） method is extended from two-level to three-level. Some pointsin three-level system are studied, such as pulse width modulation, neutral-point potential balancing etc. The implement strategy of PCC which is suitable to three-level is presented. Two-level and three-level systems are simulated, and both are controlled by PCC. The simulated results show that PCC can be applied to three-level line-side converter and that the neutral-point potential is balanced. Compared with two-level system under the same condition, the sustaining voltage of switch devices and total harmonic distortion （THD） of line current are lower in three-level system which is fit for high-voltage large-capacity traction drive system.

关 键 词：交直交电传动 网侧变流器 三电平 两电平 计算机仿真 

分 类 号：U264.37[机械工程—车辆工程]