同塔双回不换位线路电压不平衡度研究

朱庆钢; 刘前进; 陈海涛; 罗龙波; 何德龙; 韦胜旋; 曾繁源; 花欢欢

引用本文:	朱庆钢,刘前进,陈海涛,等.同塔双回不换位线路电压不平衡度研究[J].电力系统保护与控制,2014,42(7):73-79.
	ZHU Qing-gang,LIU Qian-jin,CHEN Hai-tao,et al.Study on voltage imbalance of un-transposed double-circuit lines on the same tower[J].Power System Protection and Control,2014,42(7):73-79

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同塔双回不换位线路电压不平衡度研究
朱庆钢¹, 刘前进¹, 陈海涛¹, 罗龙波¹, 何德龙¹, 韦胜旋¹, 曾繁源¹, 花欢欢²
1.华南理工大学电力学院，广东广州 510640;2.智能电网运行与控制湖南省重点实验室（长沙理工大学），湖南长沙 410004

摘要:

在线路走廊特别紧张的地区，部分线路可能没有条件采用完全换位，而同塔多回输电线路中采用不换位架设将导致电力系统三相参数不对称。针对这个问题，以某地区一条750 kV同塔双回线路为例，对该线路不平衡度计算进行了理论推导，并应用PSCAD/EMTDC软件从杆塔类型、相序排列方式、回间距离、线路长度几个方面对线路不平衡度进行了仿真分析。仿真结果表明，输电线路较短时采用同塔同窗逆相序方式架设并适当调整回间距离，能将电压不平衡度控制在一定范围内。输电线路过长时则需采取换位措施，避免对系统造成不良影响。

关键词: 同塔双回不换位输电走廊不换位线路电压不平衡度相序排列

DOI：10.7667/j.issn.1674-3415.2014.07.011

分类号:

基金项目:

Study on voltage imbalance of un-transposed double-circuit lines on the same tower

ZHU Qing-gang¹, LIU Qian-jin¹, CHEN Hai-tao¹, LUO Long-bo¹, HE De-long¹, WEI Sheng-xuan¹, ZENG Fan-yuan¹, HUA Huan-huan²

1.School of Electric Power, South China University of Technology, Guangzhou 510640, China;2.Hunan Province Key Laboratory of Smart Grids Operation and Control (Changsha University of Science & Technology), Changsha 410004, China

Abstract:

Transmission lines in some areas may have no condition to transposition completely, because of a shortage of line corridor. And un-transposed multi-circuit transmission lines will cause electrical three-phase parameters asymmetry. To solve this problem, this paper takes a 750 kV double circuit lines without transposition for an example, and the formulas of calculating the voltage imbalance on double-circuit lines are presented. Using PSCAD/EMTDC, the zero-sequence voltage unbalance and negative sequence voltage unbalance are calculated in different types of towers, different phase sequence arrangement, different distance between the two loops and different line length. According to the simulation results, when the transmission line is short, the voltage imbalance can be controlled within a certain range by adopting with the reverse phase sequence in the same tower window, which loops distance is adjusted properly. To avoid bad effect on the power system, transmission line must be transposed when the line is long.

Key words: double-circuit transmission lines un-transposed transmission corridors un-transposed line voltage imbalance phase sequence arrangement

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