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基于子模块电容电压预估的MMC分段电压平衡优化控制

DOI: 10.13336/j.1003-6520.hve.2015.07.047, PP. 2457-2463

Keywords: 高压直流输电,模块化多电平换流器,分段控制,电容电压平衡,优化控制,开关频率

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Abstract:

随着高压直流输电系统电压等级和输送容量的提升,对模块化多电平换流器的电容电压平衡控制提出了更高的要求。为了实现对高压大容量模块化多电平换流器电容电压的优化控制,基于桥臂子模块分段控制思想,采用分段电容电压排序控制方法。首先,分析了段内和段间电容电压平衡机理,提出了段间电压平衡控制策略;其次,将MMC开关频率分为两部分,分别分析了各部分开关频率的影响因素,提出了基于子模块电容电压预估的段内电容电压平衡优化控制策略,以降低器件的等效开关频率;最后,基于PSCAD/EMTDC的仿真结果表明,在有效保证电容电压平衡的条件下,等效开关频率降幅可达25%,从而验证了相关理论分析的正确性和控制策略的有效性。

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