同杆多回线路不平衡问题分析与对策  

Analysis and Countermeasures for the Unbalance Problem of Multi-parallel Line on the Same Tower

作　　者：周冠波[1] 李晓华[1] 蔡泽祥[1] 张永康[1] 邱利斌 

机构地区：[1]华南理工大学电力学院,广东省广州市510640 [2]深圳供电局,广东省深圳市518001

出　　处：《电力系统自动化》2010年第16期58-63,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50807017)~~

摘　　要：针对深圳某220 kV同杆双回线路改造为4回线路后出现严重不平衡电流的特殊问题,利用电磁暂态程序EMTDC建立同杆多回线分相参数模型,研究了相序排列、线路潮流和环网运行对同杆多回线路不平衡电流的影响,给出改善线路不平衡电流的建议。研究表明:同杆线路各回线之间的强电磁耦合是引起不平衡电流的根本原因,环网运行时相关线路的不平衡性也是重要影响因素。建议线路之间距离不宜过小,线路之间潮流差异不宜过大,宜采用逆相序架设方式,有条件情况下解环运行,以限制同杆多回线路的不平衡电流。A same tower multi-parallel line model of phase-splitting parameter is built with EMTDC,which aims to the serious unbalanced current on a Shenzhen 220 kV modernized four-parallel line on the same tower replacing a double-parallel transmission line.Based on study on influenced factors of unbalanced current such as： phase sequence arrangement,line power flow and operation in loop network,suggestions for limiting unbalance current are proposed.Simulation result shows that the strong electromagnetic coupling among each circuits is the primary reason to cause the unbalanced current,and the unbalance of concerned line in the loop network is an important factor as well.Increasing space among lines,reducing the difference of line power flows,adopting negative phase sequence array and loop network open operation under certain conditions are effective measures to limit the unbalance current on a multi-parallel line on the same tower.

关 键 词：同杆多回线路 不平衡电流 相序排列 

分 类 号：TM773[电气工程—电力系统及自动化]