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高压直流输电系统中模块化多电平换流器复预测控制

DOI: 10.13334/j.0258-8013.pcsee.2015.07.011, PP. 1637-1643

Keywords: 模块化多电平换流器,高压直流输电,模型预测控制,电容电压平衡,循环电流控制

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Abstract:

模块化多电平换流器(modularmultilevelconverter,MMC)是高压直流输电(highvoltagedirectcurrent,HVDC)系统中最具潜力的拓扑结构之一。针对MMC中存在的直流侧电容电压平衡及桥臂间的环流问题,提出了一种基于重复控制原理的模型预测控制策略,通过求解一个最优化问题,得到每个MMC单元中最佳的开关状态,来抑制循环电流,并实现MMC单元的电容电压平衡。最后,在Matlab/Simulink中对五电平背靠背MMC-HVDC的重复预测控制进行性能评估。仿真结果表明,基于重复预测控制策略的MMC-HVDC系统运行更理想,实现过程容易且简单。

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