?1100kV特高压直流输电工程直流系统谐振特性与抑制措施  

Resonance Characteristics of DC Transmission Line in ±1 100 k V UHVDC Power Transmission Project and Its Suppression Measures

作　　者：刘心旸[1] 蒋维勇[1] 李亚男[1] 

机构地区：[1]国网北京经济技术研究院,北京市昌平区102209

出　　处：《电网技术》2015年第1期202-207,共6页Power System Technology

基　　金：国家电网公司科技项目(SGCC[2012]3184)~~

摘　　要：针对±1 100 k V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50 Hz与100 Hz串联谐振的规避和抑制作用。Correlational research on harmonic impedance characteristic of DC transmission line in±1 100 kV UHVDC power transmission project is performed. Based on the results of analyzing the distributed parameter characteristics of Bergeron model for DC transmission line, aπ–shaped chain structure with lumped parameters are used for the equivalence and analysis of the long line, and the accuracy of the build-in line transmission line model in EMTDC software package is verified; based on the line model a simulation model of resonance characteristic, in which the DC equipment such as converters, smoothing reactor and neutral to ground capacitor as well as the impedance of AC power system and AC filters are included, is established and the impacts of the parameter values of DC equipment and the change of parameters in AC power system on the distribution of resonance point in DC system are analyzed; finally based on the established model different positions of harmonic sources are rationally selected, and after the addition of 50 Hz blocking filter and 100 Hz DC filter the evasion and suppression to the 50 Hz and 100 Hz series resonance are researched.

关 键 词：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 

分 类 号：TM853[电气工程—高电压与绝缘技术]