三回耦合输电线路零序参数在线测量的研究

摘要

为了实现对不同电压等级的三回耦合输电线路零序工频参数的测量，采用了基于增量法的在线测量方法。分析了三回耦合输电线路的结构，运用增量法与“双Π形”等值电路相结合，同时运用最小二乘法，提出了针对不同电压等级的三回耦合输电线路零序参数在线测量的算法。用MATLAB建立了三回耦合输电线路模型进行仿真实验，仿真结果误差满足工程精度，表明所提出的方法适用于电力系统三回耦合输电线路零序工频参数的在线测量。%In order to achieve the live line measuring zero-sequence parameters of triple-circuit coupled transmission lines of different voltage levels , it adopts the on-line measurement based on incremental method in this paper .A new live line measurement algorithm of zero-sequence parameters of triple -circuit coupled transmission lines is developed combining the incremental method with "double-Π-shaped"circuit model and the least square method to work out the parameters.A simulation experiment of triple-circuit coupled transmission line model is established by using MAT-LAB.The simulation results error can meet the engineering accuracy which proves the verification of the zero-se-quence parameter measurement algorithm and can be applied to the zero -sequence parameters measurement of power system for triple-circuit coupled transmission lines .