说明：  自编牛顿拉夫逊法潮流计算程序，原理参考何仰赞的电力系统分析一章中潮流计算部分。采用直角坐标系的计算
(The power flow calculation program of Newton Rosen method is compiled, and the power flow calculation part of he Yangzan's power system analysis is referred to in principle. Calculation with Cartesian coordinate system)