电力系统潮流上机程序，采用牛顿拉夫逊法解潮流功率方程，可以文件形式输入输出，节点数不限，包含平衡节点，PV节点，PQ节点，支路可以是非标准变比变压器支路，可以有对地支路，输入可以以阻抗形式或导纳形式。-The program about power system power flow,which can input or output by the way of writing　*.txt　file.The number of node has no limits,which can be PV node ,PQ node,balancing node.The branch can be the transformer of non-standard rate,and be independent branch.Parameter can be conductance or　impendence