说明：  计算电力系统稳态潮流，使用直角坐标下的牛拉法，用牛顿迭代求解非线性方程组。计算结果包括节点电压、发电机注入功率、负荷注入功率支路始端功率、支路末端功率、支路损耗、网络损耗
(Calculation of the steady-state trend of power system, using ox-drawn in the rectangular coordinate method for solving nonlinear equations using Newton iteration. The calculation includes the node voltage of the generator into the power load to inject power slip began end power, slip the end of the power branch outages, network connectivity loss)