昆柳龙特高压三端混合直流输电线路边界频率特性研究  

Research on boundary frequency characteristics of Kunliulong hybrid three-terminal UHVDC transmission line

作　　者：邢超 蔡旺 毕贵红[2] 陈仕龙[2] 高敬业 王龙[2] XING Chao;CAI Wang;BI Guihong;CHEN Shilong;GAO Jingye;WANG Long(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,China;School of Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Kunming Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Kunming 650011,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,云南昆明650217 [2]昆明理工大学电力工程学院,云南昆明650500 [3]云南电网有限责任公司昆明供电局,云南昆明650011

出　　处：《电力自动化设备》2023年第2期135-141,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52067009)。

摘　　要：为研究电网换相换流器和模块化多电平换流器并联型特高压三端混合直流线路行波边界保护,有必要研究电网换相换流器和模块化多电平换流器并联型特高压三端混合直流线路边界频率特性。特高压三端混合直流输电线路边界不对称,分析了昆北侧边界、柳北侧边界、昆柳段线路末端边界、柳龙段线路首端边界、龙门侧边界的拓扑结构。建立特高压多端混合直流输电线路边界频域模型,分析线路边界的频率特性,研究高频和中低频暂态信号在输电线路边界作用下的衰减特性。研究结果表明:昆北、柳北、龙门侧边界,对高频暂态信号呈高阻特性,有较强的衰减作用;昆柳段线路末端边界和柳龙段线路首端边界,对中低频暂态信号具有一定衰减作用,对高频暂态信号衰减较弱。In order to study the traveling wave boundary protection of the line commutated converter-modular multilevel converter(LCC-MMC) parallel hybrid three-terminal UHVDC line,it is necessary to study the boundary frequency characteristics of the LCC-MMC parallel hybrid three-terminal UHVDC transmission line. The boundary of hybrid three-terminal UHVDC transmission line is asymmetric. The topological structures of Kunbei-side boundary,Liubei-side boundary,the boundary of Kunliu-section line last end,the boundary of Liulong-section line first end,and the Longmen-side boundary are studied. The boundary frequency domain model of hybrid multi-terminal UHVDC transmission line is established,by which,the boundary frequency characteristics of line and the attenuation characteristics of high-frequency transient signals under the boundary of transmission line are studied. The study results show that for high-frequency transient signals,Kunbei,Liubei and Longmen-side boundaries exhibit high resistance characteristics and have a strong attenuation on high-frequency transient signals,the boundary of Kunliu-section line last end and the boundary of Liulong-section line first end have attenuation effect on the mid-low frequency transient signals,and the attenuation of the high frequency transient signals is weak.

关 键 词：特高压三端混合直流输电 线路边界 频率特性 高频暂态信号 衰减特性 

分 类 号：TM721.1[电气工程—电力系统及自动化]