输电线路零序阻抗参数典型抗干扰测量方法的分析与仿真

输电线路间强电磁耦合造成的干扰严重影响输电线路参数测量的精度。首先，分析了5种典型的输电线路零序阻抗参数抗干扰测量方法的特点及其误差来源，利用PSCAD建立了5种典型抗干扰方法的测量模型，并对各自的测量误差进行仿真，分析了不同情况的干扰对5种抗干扰方法测量结果的影响。随后，设立了两种典型的强干扰环境，分别采用5种抗干扰方法进行测量，通过仿真结果的对比，得到了两种情形下5种抗干扰方法的测量误差大小排序。最后，分析了被测线路分别为停电线路和运行线路时，测量仪器分辨率对5种抗干扰方法的影响。研究结果可为强干扰环境下输电线路零序阻抗参数抗干扰测量方法的选取提供参考。

Analysis and Simulation of Typical Anti-interference Measuring Methods for Zero Sequence Impedance Parameters of Transmission Lines

The interference caused by strong electromagnetic coupling between transmission lines seriously affects the measurement accuracy of impedance parameters of transmission line. Firstly, the characteristics and error sources of five typical zero sequence parameter anti-interference measurement methods for transmission lines are analyzed. The measurement models of the five typical measurement methods are established by using PSCAD, and their measurement errors are simulated separately. The influence of different conditions on the measurement results of five typical measurement methods is analyzed. Then, two typical strong interference environments are set up, and five anti-interference measurement methods are used to measure, respectively. By the comparison of the simulation results, the order of the measurement errors of the five anti-interference methods in the two cases is obtained. Finally, the effect of the measuring instrument resolution on the measurement methods is analyzed when the measured line is withdrawn from normal operation and under normal operation, respectively. The results of this study can provide a reference for the selection of anti-interference measurement methods for transmission line impedance parameters in strong interference environment.