reactive power optimization;  nonlinear programming;  Original-dual internal point algorithm;  barrier parameters;  dual gap;  Acceleration factor

Based on the nonlinear programming model of reactive power optimization in power system, the original dual internal point algorithm is used for global optimization. In this paper, according to the physical nature of the obstacle parameters and the characteristics of the power system itself, a method is proposed to determine the corresponding obstacle parameters according to the variables of different physical meanings when using the original dual internal point algorithm to analyze the reactive power optimization of the power system. On this basis, the influence of acceleration factor on the algorithm in the obstacle parameters is analyzed, and a dynamic determination strategy of acceleration factor is proposed. The calculation analysis of IEEE118 node system shows that the proposed algorithm has good convergence and fast calculation speed.