基于补偿分量的MMC最大调制系数的分析  

Maximum modulation index analysis of MMC based on compensating component

作　　者：刘一琦[1] 李宁宁[1] 傅裕[1] 王建赜[1] 纪延超[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001

出　　处：《电机与控制学报》2015年第4期53-57,64,共6页Electric Machines and Control

基　　金：科技部国际科技合作计划资助项目(2010DFR70600)

摘　　要：针对模块化多电平换流器(MMC)的相间环流问题,提出基于补偿分量的调制方法以便于降低MMC调制系数中的基频分量。首先通过结合实际系统中电容参数设计和换流器的正常运行范围,对MMC子模块电容电压纹波进行取值并求解其最大值,然后分析调制系数中抑制环流的补偿分量与电容电压纹波之间的数量关系,最终得到MMC最大调制系数的取值范围。仿真和实验验证的结果表明,通过对含有补偿分量的最大调制系数范围的确定,系统环流得到了有效抑制,避免了过调制现象的发生,有利于MMC系统的稳定运行。Aiming at the circulating current in modular multilevel converter （ MMC ） , the modulation method was proposed based on compensating components to reduce the fundamental component in the modulation index. First, considering the parameter of capacitor design and the range of converter opera-tion in practical system, capacitor voltage ripple in MMC was calculated, its maximum value was de-rived, and then the relationship between compensating component for eliminating circulating current in modulation index and capacitor voltage ripple was analyzed. Finally, the range of the maximum modula-tion index for MMC was obtained, and the simulation and experiment were performed to verify the theoret-ical results. It is shown that by confirming the maximum modulation index with the compensated term, the circulating current can be effectively eliminated. At the same time, over-modulation is avoided, which ensures the stable operation of MMC.

关 键 词：补偿分量 环流抑制 模块化多电平换流器 调制系数 电容电压纹波 

分 类 号：TM46[电气工程—电器]