超特高压交直流线路同塔架设潜供电流特性分析  

Analysis on Secondary Arc Current Characteristics of EHV/UHV AC/DC Transmission Lines Erecting on the Same Tower

作　　者：何柏娜[1] 颉雅迪 王乐淼 姜仁卓 周宇洋 毛亚哲 HE Baina;XIE Yadi;WANG Lemiao;JIANG Renzhuo;ZHOU Yuyang;MAO Yazhe(Shandong University of Technology,College of Electrical and Electronic Engineering,Shandong Zibo 255049,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《高压电器》2020年第10期168-175,共8页High Voltage Apparatus

基　　金：山东省自然科学基金项目(ZR2016EL17);山东省高等学校科技计划项目(J14LN27)。

摘　　要：中国架空线路走廊资源紧缺,交直流同塔架设成为直流输电的必然趋势,但同塔架设的交直流线路发生故障使直流线路在故障位置产生潜供电流,影响直流重启动。针对此问题,文中基于交直流线路同塔架设产生潜供电流的机理,采用PSCAD建立交直流同塔系统仿真模型,研究不同故障位置、耦合段长度、耦合段内、外换位对交直流线路潜供电流和恢复电压的影响。结果表明:直流线路潜供电流受故障位置和耦合段长度的影响较大,并且耦合段内全换位可有效减小交直流线路的潜供电流,参照云广特高压直流重启动时序,设置重启动时序可增加第一次重启动去游离的时间以保证系统稳定运行。该研究结果可为交直流同塔架设输电线路设计提供参考。The resources of overhead line corridor in China are in short supply,and the AC and DC systems erecting on the same tower has become the inevitable trend of DC transmission.However,the failure of AC/DC line erected on the same tower causes DC transmission line to generate secondary arc current in the fault location,which affects the DC system restart.In view of this problem,PSCAD is used to establish a simulation model of AC/DC system on the same tower,which is based on the generation mechanism of the secondary arc current on the same tower of AC and DC lines.The effects of different fault location,length of coupling section,transposition inside and outside of coupling section on secondary arc current and recovery voltage of AC/DC lines are studied.The results show that the secondary arc current on DC line is greatly affected by the fault location and the length of coupling section,and the full transposition in the coupling section can reduce the secondary arc current on the AC and DC lines effectively.Re⁃fer to Yunguang UHV DC restart sequence,setting the restart sequence can increase the time for the first restart to free,and ensure the stable operation of the system.The research results can provide reference for the design of AC/DC transmission lines erecting on the same tower.

关 键 词：特高压直流 交直流同塔架设 耦合作用 换位方式 潜供电流 

分 类 号：TM75[电气工程—电力系统及自动化]