山西500kV长久三回线路电流不平衡原因分析及改造研究  

Analysis on Three-Phase Current Unbalance in Triple-Circuits of 500 kV Transmission Lines From Changzhi to Jiu’an in Shanxi Province

作　　者：孟恒信[1] 梁建伟[2] 薛磊[1] 周国华[2] 王志刚[1] 武国亮[2] 白瑞[1] 张悦[1] 王小琪 于嘉[4] 

机构地区：[1]山西省电力公司电力科学研究院,山西省太原市030001 [2]山西省电力公司,山西省太原市030001 [3]长治电力公司,山西省长治市046011 [4]华北电力大学国际教育学院,北京市昌平区102206

出　　处：《电网技术》2013年第3期641-646,共6页Power System Technology

摘　　要：为研究山西500 kV长久三回线路电流不平衡的原因,优化改造方案,使用PSCAD电磁暂态程序输电线路结构模型进行了不同导线排列方式的仿真研究,推荐了最优改造方案,实施改造后效果良好。通过仿真研究及改造过程发现,对于不换位同塔双回线路,在36种排列方式中6种逆相序排列方式电流不平衡度最小,且6种逆相序排列方式电流不平衡度基本相同,但对于2回不换位同塔双回线和一回不完全换位单回线路并列运行的情况,由于受单回线路的影响,6种逆相序改造方案差异较大,有最优方案可选。To investigate the cause of three-phase current unbalance of triple-circuits of 500kV transmission lines from Changzhi to Jiu’an in Shanxi province thoroughly and optimize the renovation scheme,using electromagnetic transient program PSCAD and structural model of the transmission lines different conductor arrangements were simulated and the optimal renovation scheme was recommended,and satisfied renovation effects were achieved.It was discovered from both simulation results and renovation process that for non-transposed double-circuit transmission lines on the same tower,within the 36 kinds of conductor arrangements the minimum current unbalance could be attained by six kinds of reverse phase sequence conductor arrangements and the current unbalance degrees of the six reverse phase sequence conductor arrangements are basically the same;however under the parallel operation of non-transposed double-circuit transmission line on the same tower with incomplete-transposed single transmission line,due to the affection of the single transmission line there were obvious differences among the six renovation schemes adopting reverse phase sequence conductor arrangements,thus there was the optimal one that could be selected.

关 键 词：三相电流不平衡 不换位线路 结构参数 1000kV 保护启动 

分 类 号：TM726[电气工程—电力系统及自动化]