本发明提出了一种三芯电力线单位长度参数矩阵求解方法。由于三芯电力线的单位长度参数矩阵元素无法直接得到准确值，基于电磁仿真方法可以得到单位长度参数的初值，由于直接进行修正的参数较多，每个参数会对多种方式下的信道测量结果产生影响，提出一种基于模域的参数修正方法，使得各个参数的修正能独立完成。即基于相模变换方法，将三芯电力线的单位长度参数矩阵解耦为共模和差模参数，在电磁仿真的基础上，通过测量两种模式下的开路阻抗，对模域单位长度参数进行线性修正，最终得到单位长度参数矩阵的准确值。

The invention provides a three-core power line unit length parameter matrix solving method. The unit length parameter matrix element of the three-core power line cannot directly obtain an accurate value; An initial value of a unit length parameter can be obtained based on an electromagnetic simulation method, due to the fact that a large number of parameters are directly corrected, each parametercan affect channel measurement results in various modes, and the parameter correction method based on the mode domain is provided, so that correction of each parameter can be independently completed.The method comprises the following steps of: decoupling a unit length parameter matrix of a three-core power line into a common-mode parameter and a differential-mode parameter based on a phase-mode transformation method, and performing linear correction on the unit length parameter of a mode domain by measuring open-circuit impedance in two modes on the basis of electromagnetic simulation to finally obtain an accurate value of the unit length parameter matrix.