PQ分解法，有些还需要改进，该程序所对应的例子是东南大学陈珩编的《电力系统稳态分析（第二版）》的例4-5-PQ decomposition, some also needs to be improved, The procedure corresponding to the example of Southeast University, Chen Heng addendum to the "steady-state power system analysis (second edit

电力系统分析潮流计算PQ分解法，用PQ分解法求解潮流计算，解决包括对地支路问题等的PV、PQ、平衡节点问题