Aiming at the problem of fast switch fault current limiter（FSFCL）in power grid

a global optimal configu-ration model of FSFCL based on improved PSO-GSA algorithm is proposed. Firstly

the basic principle of FSFCL isanalyzed

and the sensitivity method based on branch impedance is used to narrow the search space. The current lim-iting effect and the cost of limiter are taken as optimization targets to construct the fitness function. Then

the particleswarm optimization algorithm is used to improve the gravitational search algorithm（PSO-GSA）and the hybrid algo-rithm is further improved. The algorithm optimization process is formulated. At the same time

due to the best resultsmay not be achieved when selecting the final configuration scheme based on artificial experience. The scheme evalua-tion model is established. The weights of each index combination are determined according to the principle of relativeentropy. The scheme is sorted by TOPSIS method

and the final configuration scheme is selected. The scheme evalua-tion model can avoid the blindness of installing FSFCL line only by manual experience and effectively reduce thecost of power grid planning. Finally

the effectiveness of the global optimal configuration model and the scheme eval-uation model is verified by the simulation of IEEE39 node system.