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采用质因子分解法与希尔排序算法的MMC电容均压策略

DOI: 10.13334/j.0258-8013.pcsee.2015.12.008, PP. 2980-2988

Keywords: 模块化多电平换流器,电容电压均衡,质因子分解法,混合排序法,优化效率

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Abstract:

子模块电容电压均衡控制策略是保证模块化多电平换流器(modularmultilevelconverter,MMC)正常运行的重要环节。对于每相桥臂含有大规模数量子模块的模块化多电平换流器高压直流输电(modularmultilevelconverterbasedhighvoltagedirectcurrent,MMC-HVDC)系统,减小排序复杂度对MMC-HVDC工程控制器设计难度以及硬件需求的降低具有重要意义。该文基于质因子分解法提出一种优化的混合排序法,通过引入希尔排序算法大幅度降低排序次数,从而降低仿真时间,降低了对系统硬件的要求。推导适用于MMC-HVDC系统的希尔排序步长的时间复杂度,给出基于混合排序法的排序次数计算公式,分析分组层数对系统降低频率的影响,得到分组层数与混合排序法优化效率成反比例关系的结论。最后在PSCAD/EMTDC中搭建两端401电平MMC-HVDC模型进行仿真,仿真结果验证了混合排序法及分组层数对优化效率影响的分析的有效性与正确性。

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