牵引供电系统的潮流计算，电力机车等效为PQ负荷，计算牵引网电压分布-Traction power supply system power flow calculation, electric locomotive equivalent PQ load, calculate the traction network voltage distribution

电力系统的牛顿-拉夫逊发潮流计算的matlab函数，测试基于matpower。(Matlab function of power flow calculation in power systems.)