交流线路对平行架设±500kv同塔双回直流的影响及措施研究.pdfVIP

第 38 卷 第 19 期 电力系统保护与控制 Vol.38 No.19 2010 年 10 月 1 日 Power System Protection and Control Oct. 1, 2010 交流线路对平行架设±500 kV 同塔双回直流的影响 及措施研究 1 1 1 2 李 涛 ，李新年 ，蒋卫平 , 高 健 （1.中国电力科学研究院，北京 100192; 2.天津电力工程监理有限公司， 天津 300143） 摘要：根据三沪Ⅱ回±500 kV 同塔双回直流主回路参数和华东地区典型 500 kV 交流线路数据，采用 EMTDC 程序建立了交/ 直流输电系统的仿真模型。研究了交直流线路平行架设条件下，直流线路极导线布置和直流系统运行工况对交直流平行架设 的影响，并给出了换流变阀侧直流偏磁电流的计算结果。对交/直流线路的平行长度，它们之间的接近距离以及抑制换流变 压器阀侧直流偏磁电流的措施提出了建议。 关键词：平行架设交/直流线路；同塔双回直流；直流偏磁电流；直流系统电磁暂态 Influence of AC transmission lines on parallelly erected ±500 kV HVDC double circuit transmission lines and suppression measure 1 1 1 2 LI Tao ，LI Xin-nian ，JIANG Wei-ping , GAO Jian （1.China Electric Power Research Institute，Beijing 100192 ，China; 2.Tianjin Electric Power Engineering Supervision Co.Ltd, Tianjin 300143, China ） Abstract ：According to the main circuit parameters of ±500 kV HVDC project from Three Gorges to Shanghai Ⅱ and the typical data of 500 kV AC transmission line in east of China ，the model for simulation of AC/HVDC transmission lines is built by electro-magnetic transient in DC System （EMTDC ）program ．The effects of different conductor disposal schemes of DC lines and different HVDC operation modes on parallel AC/DC transmission lines are researched ．The DC bias current at valve side of converter transformer is researched ，and the corresponding calculation results are given ．Several suggestions on the parallel length between AC and HVDC lines，their adjacent distance and the measure to suppress the DC bias current at valve side of converter transformer are put forward