区域220kV同塔双回线路不对称问题的研究分析  

Research and Solution Making of the Asymmetry Problem of Double Circuit Lines on the Same Tower in the Regional 220kV Power Grid

作　　者：李现宝 何信林[2] Li Xianbao;He Xinlin(Shandong Weiqiao Aluminum-electricity Co., Ltd, Zouping, Shandong 256200;Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054)

机构地区：[1]山东魏桥铝电有限公司,山东邹平256200 [2]西安热工研究院有限公司,西安710054

出　　处：《电气技术》2017年第4期75-78,83,共5页Electrical Engineering

摘　　要：同塔双回输电线路电气参数不对称会造成线路电流、电压不平衡,进而影响系统运行的经济性与可靠性。本文首先分析了导致同塔双回输电线路不对称的原因,提出了通过利用ATP-EMTP仿真软件对山东省某区域220kV电网同塔双回输电线路在不同负荷下进行建模及仿真计算,分析了其在同相序、逆相序、异相序、电容补偿器等不同连接方式下的电网不平衡度,并提出了相应的决策及建议。研究结果表明:长距离同塔双回输电线路,同相序排列时不平衡度最大,逆相序次之,异相序时最小;电容器补偿可以显著改善负序不平衡度,而且随着线路长度的增加,改善效果会更加明显。Electrical parameters asymmetry of double circuit lines on the same tower will cause the line current and voltage unbalance,thereby affecting the operation of the system of economy and reliability.This paper analyzes the cause of the asymmetry problem of double circuit lines on the sametower,and put forward the modeling and simulation of the double circuit lines on the same tower in aregional220kV power grid in Shandong province by using ATP-EMTP software.It analyzes the grid unbalance in the same phase sequence,reverse phase sequence,sequence of phase,capacitorcompensation,etc.different connectors,and the corresponding decisions and recommendations.The results show that:the long-range tower double circuit transmission lines are arranged at the same phasesequence imbalance maximum,followed by reverse phase sequence,then the inverse phase sequence;compensation capacitor can significantly improve the negative sequence unbalance,and with the line length increase and improve the effect will be more obvious.

关 键 词：同塔双回 不对称 ATP-EMTP 逆相序 异相序 

分 类 号：TM75[电气工程—电力系统及自动化]