Unified power flow controller（UPFC）is the most comprehensive flexible alternating-current transmission system（FACTS）device. It can independently and quickly adjust active and reactive power of transmission lines. With the continuous improvement of grid scales and interconnection levels

electrical distance between power plants and stations is obviously shortened and system impedance is decreased. To this end

the short-circuit current in the system is significantly increased

which put forward more critical requirements for safety and stable operation of the system as well as various electrical equipment of the power system. The receiving-end grid with increasingly complex configuration

particularly in Zhejiang and Jiangsu and so on

has become the bottleneck restricting construction and further development of electric power due to such issues as uneven distribution of power flow and difficult control of short-circuit currents. Considering that the fault current limiter（FCL）can

in case of serious fault in the system

be able to limit effectively short-circuit currents

on the basis of existing topological structure of UPFC in this paper

FCL is combined with the fast bypass switch

which gives full play to the optimized flow of UPFC at steady condition and emergency power control after the fault of the system and

at the same time

operation of FCL in the case of serious fault of system reduces short circuit current of system. The planning application of the optimal topological structure proposed in this paper in Zhejiang Power Grid is studied and the effectiveness of the optimized topological structure in the short circuit control and flexible adjustment of power flow is verified.