平行输电线路系统分析的技术研究

Research on the System Analysis of Parallel Transmission Line

指出与常规输电线路相比,平行输电线路存在较严重的电磁耦合和电容耦合现象,会对系统运行和分析方法造成影响。针对平行输电线路不同结构,形成了完整的平行输电线路参数计算流程及应用原则,实现了平行输电线路正、负、零序参数解偶方法,满足了大型电力系统安全分析的需要;建立了平行输电线路不平衡度和潜供电流分析模型,并开发了相应的计算程序,可满足不同结构平行输电线路的不平衡度和潜供电流计算需要;分析了不同平行类型下,平行长度、平行间距和相位布置对平行输电线路不平衡度和潜供电流的变化趋势,提出了影响平行输电线路不平衡度和潜供电流的主导因素,并提出了相应的对策。

Compared with the conventional transmission line,the serious electromagnetic coupling and capacitive coupling problems of the parallel transmission lines have become obstacles for the system operation and analysis.This paper formed a complete calculation process and application principles of parallel transmission line parameter so that the proposed decoupling method about positive,negative and zero sequence parameters of parallel transmission line can meet the needs of large-scale power systems security analysis.This paper established unbalance degree and the secondary arc current analysis model of parallel transmission lines and developed the computer program to meet the demand.Analysis on the trends of unbalance degree and secondary arc current during different parallel length,parallel spacing and phase arrangement,along with the affecting dominant factors and the corresponding countermeasures,are also proposed in the paper.