In this paper optimal location and capacity of

Unified Power Flow Controller to improve the power system

stability using hybrid technique composed of ABC-GSA

algorithms is proposed. Here, the maximum power loss bus is

identified as the most suitable location for connecting the UPFC

under generator outage conditions. The optimum location has

been determined using the Artificial Bees Colony (ABC)

algorithm. Depending on the violated power flow quantities the

Gravitational Search Algorithm (GSA) optimize the required

capacity of the UPFC to recover the initial stable operating

condition. The proposed work is implemented in the MATLAB

platform and the performance is analyzed by comparison with

individual algorithms ABC and GSA. The comparison results

demonstrate the superiority of the proposed Hybrid approach

and confirm its potential to solve the problem.