中文说明：这是从CSDN网站中下载的程序，但是运行9节点时不收敛，且运行3节点和39节点和测试数据对不上，因此在此基础上修改了程序。这程序根据步骤分成多个子程序，分别为输入数据、进行节点优化、形成导纳阵、置初值、形成雅克比矩阵、解线性方程、求支路潮流和输出结果等。这个程序修改完后主要针对9节点。此程序的优点就是在文本文件输入数据，并输出结果保存在文本文件中。
English Description：
This is a program downloaded from CSDN site, but when you run a 9-node does not converge, and run 3 nodes and 39 and test data is not, so the program is modified on the basis of this. This program according to step into multiple subroutines, respectively as input data, forms, to node admittance matrix, reset initial values, form a Jacobian matrix, solving linear equations and find line flow and output results. After finishing this program to modify for the 9 nodes. The advantage of this procedure is to enter the data in a text file, and save the output in a text file.