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采用质因子分解法的模块化多电平换流器电容电压平衡优化算法

DOI: 10.13334/j.0258-8013.pcsee.2014.33.006, PP. 5846-5853

Keywords: 模块化多电平换流器,电容电压平衡,子模块分组,排序次数,质因子分解

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Abstract:

模块化多电平换流器(modularmultilevelconverter,MMC)子模块电容均压问题,是MMC型高压直流输电系统稳定运行的关键。当桥臂子模块数过多时,采用传统的排序均压算法将使电容电压排序运算量过大,这对控制器的硬件设计带来巨大挑战。针对传统均压算法的问题,提出了一种改进的电容电压平衡方法,通过对子模块分组,减少了电容电压排序运算量,同时采用一种组间电压平衡算法,解决了各组间电压不平衡问题。在此基础上,类比整数质因子分解思想进一步优化,得到电容电压平衡分组排序的最优化方法。在实时数字仿真器RT-Lab中搭建了模块化多电平换流器直流输电系统(modularmultilevelconverterhighvoltagedirectcurrent,MMC-HVDC)模型进行仿真验证,仿真结果表明,改进方法及最优化方法能在维持子模块电容电压平衡的同时,大大提高仿真计算速度,从而验证了所提出方法的有效性和可行性。

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