基于波参数的直流线路谐波阻抗解析方法A Novel Analytic Method of DC Line Harmonic Impedance Based on Wave Parameters
刘心旸;李亚男;蒋维勇;
摘要(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±800 k V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200 Hz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50 Hz与100 Hz附近存在谐振风险,需要采取一定的谐振抑制措施。
关键词(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
基金项目(Foundation):
作者(Author): 刘心旸;李亚男;蒋维勇;
Email:
DOI: 10.13335/j.1000-3673.pst.2015.10.024
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