特高压交流线路对平行架设特高压直流线路的工频电磁感应影响  

Electromagnetic influence of AC transmission lines on parallelly erected UHVDC transmission lines

作　　者：李宝聚[1] 周浩[2] 郭雷[1] 

机构地区：[1]吉林省电力有限公司,吉林长春130021 [2]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力系统保护与控制》2013年第10期20-26,共7页Power System Protection and Control

摘　　要：特高压交流/直流输电线路平行架设可以提高走廊利用率。同时,特高压交流线路通过电磁耦合会在特高压直流线路上感应出工频交流分量。在直流线路上感应产生的工频电流分量,经过换流器后会产生直流分量。此直流分量流经换流变压器,导致换流变压器偏磁。采用EMTDC程序建立了特高压交/直流输电系统仿真模型,对交流输电线路对平行架设直流输电线路产生的电磁感应影响进行仿真研究,分析了特高压交/直流线路平行架设长度、接近距离、线路换位以及单相接地故障等因素对工频电磁感应的影响。另外,对比分析了特高压单、双回线路与特高压直流线路平行架设,特、超高压交流线路与特高压直流线路平行架设下特高压直流线路上的工频感应电压、电流和直流偏磁电流。It can increase line corridor utilization when AC transmission lines are set parallel with UHVDC transmission lines. At the same time, the AC transmission line which is parallel with UHVDC line may cause electromagnetic influence upon UHVDC transmission line. The power frequency AC component will generate along the UHVDC transmission line. The power frequency AC current will be transformed into DC current under the action of current converter. When flowing into converter transformer, the DC current can cause transformer magnetic bias. Based upon EMTDC software, the simulation model of UHVAC/UHVDC transmission lines is set up. The electromagnetic influence of AC transmission line on UHVDC transmission line in parallel is studied. The factors such as parallel erection length, adjacent distance, conductor transposition and single phase grounding fault that affect the electromagnetic induction influence upon UHVDC transmission line are analyzed. The power frequency induced voltage, induced current and DC bias current in UHVDC lines which are paralleled with UHVAC/EHVAC transmission line and UHVAC single or double-circuit transmission line are compared and analyzed.

关 键 词：特高压 直流偏磁电流 感应电压 感应电流 电磁感应 仿真计算 

分 类 号：TM721.1[电气工程—电力系统及自动化]