说明：  首先判断IEEE33节点的拓扑结构是否满足辐射状约束，然后采用牛顿拉夫逊法计算潮流，考虑分布式电源的不确定性，采用半步变量法进行随机潮流计算，仔细研究非常有用
(First, determine whether the topology of IEEE33 nodes meets the radial constraint, and then use Newton Raphson method to calculate power flow, considering the uncertainty of distributed power generation, and use half-step variable method for random power flow calculation. It is very useful to study carefully.)