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电网技术  2015 

±1100kV特高压直流输电工程直流系统谐振特性与抑制措施

DOI: 10.13335/j.1000-3673.pst.2015.01.031, PP. 202-207

Keywords: 特高压直流输电系统,谐波阻抗,分布参数,谐振特性,基频阻波器,二次直流滤波器

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Abstract:

针对±1100kV特高压直流输电系统的直流侧谐波阻抗特性开展了相关研究,在分析直流线路Bergeron模型分布参数特性的基础上,用集总参数的长线路π型链式结构进行了等值与解析,并通过仿真比较,验证了EMTDC程序自带线路模型的准确性;基于线路模型建立包括换流器、平抗、中性点对地电容等直流设备以及交流系统阻抗、交流滤波器在内的直流谐振特性仿真模型,分析了各设备元件的参数取值以及交流侧条件改变对系统谐振点分布的影响;最后基于该阻抗模型,合理选择谐波源的不同位置,研究了加装基频阻波器和二次直流滤波器以后对直流侧50Hz与100Hz串联谐振的规避和抑制作用。

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