运用前推回推法进行配电网潮流计算。附有33母线系统数据，以供检验。程序没有考虑电容器、分布式电源，以及弱环网的影响。-Before using push back push power flow calculation method. With 33 bus system data for testing. The program does not consider the capacitor, distributed power, and the impact of the weak ring