Power analyzing method for indeterminate power flow branches based on optimization method

The invention provides a power analyzing method for indeterminate power flow branches based on an optimization method. The power analyzing method comprises the following steps: in the entire network, counting the number and types of nodes in the network, and numbering the nodes; expressing the load fluctuation of each node as an interval form including upper and lower limit information; respectively establishing constraint conditions based on power flow equations, node parameters and operational limit of a power system; respectively using active power and reactive power passing through each branch as objective functions, and combining with the established constraint conditions, establishing a branch active-power optimization model and a branch reactive-power optimization model; solving the optimization models by using an optimization algorithm so as to obtain the fluctuation range of power passing through each branch. The method can completely avoid the influence of a conservative problem on the fluctuation range of power of the branches. In addition, according to the method, different optimization models have the same constraint conditions, a parallel computing technique can be used, so that the computing efficiency is improved.