With the typical application of FACTS technology

SVC and STATCOM are used widely in the power grid. Bringing FACTS elements of achieving continuous adjustment into AVC system can play the supplementary role of reactive power adjustment of discrete adjustment. AVC system keeps the system to maintain sufficient adjustable reactive power reserve and improves operation safety of power network.It is an important topic about the interaction and coordination application of the different FACTS elements in AVC system.In this paper

the three-stage coordination and control strategy based on the rule of discrete equipment priority action

continuous equipment fine tune.AVC system is used to unify the capacitance

reactance in the substation and various FACTS elements into control system and the interaction of STATCOM controller in the control system（time stage and space section）. Finally

the proposed control strategy is verified throughout simulation. It is shown by the simulation that the system has good dynamic and static performance.