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电网技术  2015 

基于波参数的直流线路谐波阻抗解析方法

DOI: 10.13335/j.1000-3673.pst.2015.10.024, PP. 2842-2847

Keywords: 特高压直流输电,谐波阻抗,波参数,谐振特性,过电压,过电流

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Abstract:

为深入研究直流线路的谐振特性,提出一种长线路模型的解析方法,并依托某在运±800kV特高压直流输电工程进行了理论计算与仿真分析的对比研究。首先,推导出线路单位长度等效参数,并引入波参数对直流线路四端口网络进行求解,计算出各频率点的等值阻抗;其次,通过将EMTDC程序中的相域频变线路模型与计算结果进行对比分析,验证了仿真模型与所提解析方法的正确性与精度;最后,对直流系统200Hz频段以内进行阻抗解析,并仿真分析了直流线路在各类典型故障下的过电压与过电流。结果表明系统在50Hz与100Hz附近存在谐振风险,需要采取一定的谐振抑制措施。

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