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基于载波移相调制的模块化多电平变换器变频运行控制

DOI: 10.13334/j.0258-8013.pcsee.2015.11.021, PP. 2822-2830

Keywords: 模块化多电平变换器,载波移相,变频,电压平衡,低开关频率

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Abstract:

模块化多电平变换器(modularmultilevelconverter,MMC)工作于低频工况时,子模块电容电压波动加剧导致输出电压畸变严重,制约了其在中高压大功率变频调速领域中的应用。针对这一问题,在分析MMC数学模型的基础上,从维持各相上、下桥臂功率动态平衡角度出发,设计一种基于注入高频共模电压及高频环流的电压波动抑制策略。为降低功率器件开关频率并减少系统损耗,将载波移相技术应用于MMC变频驱动,分别讨论输出N+1和2N+1电平相电压的实现方式。基于载波移相调制,结合低频工况子模块电容电压波动抑制方法,提出一种变频工况下MMC子模块电容电压控制策略,并设计相应控制系统架构及实现方式。该控制策略能在变频工况维持子模块电容电压平衡,保证调速过程中MMC和电动机正常平稳运行,并在低开关频率下获得良好的输出谐波特性。最后,通过搭建Matlab/Simulink仿真及实验样机,验证所提控制策略的正确性和有效性。

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