Unified power flow controller（UPFC in short） and other flexible AC transmission equipment are connected to the closely linked system. In case of selecting constant voltage control by all the equipment

such issues as unbalance of sudden reactive power

voltage oscillation and power distribution at grid disturbance are caused due to unreasonable selection range of equipment parameters and imperfect coordination of the parameters of each equipment. In this paper

a kind of voltage-reactive power control is proposed to allow the control target voltage of the access point to fluctuate near the rated value

so to improve above shortcoming

distribute reasonably power output and reduce voltage oscillation. Finally

both correctness of theoretical analysis and the effectiveness of the coordination control strategy are verified by way of PSCAD/EMTDC simulation of the south part of East-China power grid.