基于MMC的整流系统在不对称桥臂下的环流抑制方法  

A Circulating Current Suppression Method for MMC-based Rectification System with Asymmetric Bridge Arms

作　　者：李赟贵 杭丽君[1] 李国杰[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《电气自动化》2017年第2期12-15,共4页Electrical Automation

基　　金：国家重点研发计划项目"大型光伏电站直流升压汇集接入关键技术及设备研制"(2016YFB0900200)资助

摘　　要：模块化多电平变换器(MMC)存在内部环流,在MMC系统上、下桥臂不对称情况下其环流复杂程度增大。基于平均电容电压的控制模型,通过引入低通滤波环节与准比例谐振控制的方法,完成了对MMC系统在不对称桥臂下的环流抑制。最后,在MATLAB/Simulink仿真系统与实际的三相MMC样机平台上,分别对改进前后的控制方案进行实验。通过仿真与实验结果,验证了基于MMC的整流系统在上、下桥臂不对称情况下,环流抑制策略的有效性。There exists circulating current within the modular multi-level converters （ MMC）. In case the MMC has asymmetric upper and lower bridge arms, complexity of the circulating current will increase. Based on a control model of average capacitor voltage, suppression of circulating current is effected for the MMC system with asymmetric bridge arms through introduction of a low-pass filter and quasi-PR control. Finally, control schemes before and after improvement are tested respectively on MATLAB/Simulink simulation system and a three-phase prototype platform. Simulation and experimental results verify the effectiveness of the proposed circulating current suppression strategy for the MMC-based rectification system with asymmetric upper and lower bridge arms.

关 键 词：模块化多电平变换器 环流谐波抑制 电容电压均衡 低通滤波器 准比例谐振控制器 

分 类 号：TN624[电子电信—电路与系统]