基于原对偶内点法对电力系统的电压无功优化问题进行了分析．首先对原对偶内点法进行了扩展，使之能处理电压无功优化控制中大量的不等式约束；此外，提出了一种新的壁垒参数和步长的控制策略，并采用了一种有效的预测校正方法来提高算法的收敛速度．实际电网中优化计算表明，原对偶内点法可有效地解决大规模电网的电压无功优化问题 The problem of voltage-reactive power optimization in power system is analyzed based on the original-dual interior point method. Firstly, the original-dual interior point method is expanded to deal with a large number of inequality constraints in the voltage-reactive power optimization control. In addition, a new control strategy of the barrier parameters and the step length is proposed, and a Effective prediction  correction method to improve the convergence rate of the algorithm. The optimization calculation in the actual power grid shows that the original-dual interior point method can effectively solve the voltage-reactive power optimization problem of large-scale power grid