Based on the effectiveness and directionality of generator reactive power reserve (GRPR)

an optimization model for minimizing effective GRPR considering static shunt reactive power compensation is proposed. Using the theory of Benders decomposition algorithm

the original problem is decomposed into a master problem that corresponds to normal operation condition and several sub-problems that correspond to anticipated contingency and stressed operation conditions. In order to reduce the scale of model solving

a screening algorithm for sub-problems is designed

which is capable of improving the overall model solving efficiency of Benders algorithm. In the end

case studies on an IEEE 39-bus system have verified the effectiveness of the proposed algorithm. This work is supported by State Grid Corporation of China.