改程序适应于电力系统短路电流计算，生成节点导纳矩阵和阻抗矩阵。-Change program suitable for power system short-circuit current calculation, to generate the node admittance matrix and the impedance matrix.

这个程序是用于21节点的程序，求导纳矩阵用了一种新的方法，供参考！-This program is used to program for the 21 node admittance matrix, using a new method, for reference!

该程序是IEEE118节点系统的节点导纳矩阵求取程序，输入相应的已知参数便可得到。-The program is a nodal admittance matrix IEEE118 bus system to strike the program, enter the corresponding known parameters can be obtained.