The traditional automatic voltage control method does not consider the possible variation trend of the power grid in a period of time

but only the reactive power optimization of the current voltage

which results in frequent operation of reactive power compensation equipment and affects stable operation mode of power system. For this purpose

a kind of reactive power optimization control method is proposed in this paper and the basic framework of the control method is described from such three aspects as day ahead robust planning

intra day dynamic optimization and real-time dynamic control. The multi-time dimensional reactive power optimization control model is set up and the optimization objective of the control method is determined by considering the network loss and voltage stability of the system. Finally

the robustness and effectiveness of the control method proposed in this paper are simulated and verified by IEEE 14 node example. The result shows the fuanction of the strategy proposed in this paper in achieving fine adjustment aspect of reactive voltage.