适于40节点的电力系统潮流计算，收敛性较好。-failed to translate

用于黑启动求解频率变化值的PQ潮流分解，输出由每次迭代后各参数的变化量。-PQ trend for black start solving the frequency change value decomposition, the output from each iteration, each parameter change.

运用PQ分解法计算的潮流程序。并附上测试节点-PQ decomposition method using the trend of the program. Attach test node