同塔四回输电线路三相不平衡电流仿真分析  

Simulation analysis of the three-phase current imbalance in quadruple-circuit transmission lines on the same tower

作　　者：周雷 薛飞 李宏强 马鑫 赫嘉楠 ZHOU Lei;XUE Fei;LI Hongqiang;MA Xin;HE Jianan(Electric Power Research Institute of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750011,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,宁夏银川750011

出　　处：《宁夏电力》2023年第3期16-22,共7页Ningxia Electric Power

摘　　要：同塔四回线路各导线电磁耦合紧密,三相电流不平衡现象更为严重。为解决同塔四回线路三相不平衡电流过大的问题,首先,以实际输电线路为例,基于电磁暂态与电力电子仿真软件(electromagnetic transient&power electronics,EMTPE)建立了电磁暂态模型,并通过与实测数据对比验证模型的有效性;随后,利用所建模型分析线路三相电流不平衡的主要影响因素,同时根据分析结论指出导线相序排列方式及空间位置分布不恰当是引起宁夏某同塔四回输电线路三相电流不平衡的主要原因,并提出更换一回线相序排列为逆相序的解决方案;最后,结合工程规划情况,给出了该同塔四回线路各导线的最优相序组合方式,为后续工程建设提供指导建议。The intense electromagnetic coupling of each conductor of the quadruple-circuit transmission line on the same tower leads to severe three-phase current imbalance.To address this issue,using the simulation software of electromagnetic transient&power electronics(EMTPE)first establishes an electromagnetic transient model based on actual transmission line parameters.The model’s effectiveness is verified by comparing simulation results with the practical measurements by the model.Then the primary factors of the three-phase current imbalance in the transmission lines are analyzed through the model.The analysis indicates that improper arrangement of conductor phase sequence and spatial distribution are the main causes of the three-phase current imbalance in a specific quadruple-circuit transmission line on the same tower in Ningxia.A solution involving the adjustment of the phase sequence arrangement of one circuit to its opposite is proposed.Finally,in the context of engineering planning,the optimal phase sequence combination for each conductor in the quadruple-circuit transmission lines is presented,providing guidance and suggestions for future project construction.

关 键 词：同塔四回 输电线路 三相不平衡 零序电流 相序 

分 类 号：TM75[电气工程—电力系统及自动化]