环状供电系统不平衡电流分析研究  

Research and Analysis on Unbalanced Current of Annular Power Supply System

作　　者：唐震[1] 武中 张悦[1] 吴明峰[1] 杨林也 

机构地区：[1]国网山西电力科学研究院,太原030001 [2]国网山西电力经济技术研究院,太原030001

出　　处：《华东电力》2014年第5期957-961,共5页East China Electric Power

摘　　要：短距离不换位架设的同塔双回线导线相序排列不同,其参数不对称所引起的不平衡电流也不相同。多回同塔双回线接入同一变电站时,为优化全站导线相序排列,提出一种考虑其相互影响的降低全站不平衡电流的递推算法。对于同塔双回线单回打开π入其他变电站而形成单(双)端电源环状供电系统的情况,其不平衡电流因阻抗关系发生变化而受到无功补偿等因素的影响。通过分析提出了调整相序排列和无功补偿策略来达到降低不平衡电流的效果。最后,通过基于PSCAD的电磁暂态仿真结合上述方案对某220 kV变电站周边8条输电线路的电流不平衡情况进行了研究验证。Since the phase sequences of short-distance untransposed common-tower double-circuit lines are different,unbalanced current caused by asymmetric parameter varies seriously.Therefore,a recursive algorithm was put forward to reduce the unbalanced current when multi-circuit common-tower double-circuit lines are switched in the same substation to optimize the phase sequence arrangement.When one single line of the common-tower double-circuit lines switches in other substation to form a annular power-supply system with a single/double-power-source,the unbalanced current would be influenced by reactive power compensation due to varied impedance.After analysis,the approaches of adjusting phase sequence and reactive power compensation strategy were proposed to reduce unbalance current.Finally,combining with the schemes above,the situation of unbalanced current of 8 transmission lines around a 220 kV substation was studied and verified based on PSCAD electromagnetic transient simulation.

关 键 词：环状供电系统 不平衡电流 相序排列 

分 类 号：TM711[电气工程—电力系统及自动化]