Optimal Design of UPFC Controller for Damping Power System Oscillations by Using Bacterial Foraging Algorithm

This paper presents an approach for designing Unified Power Flow Controller (UPFC) using Bacterial Foraging Algorithm (BFA) for damping low frequency oscillations in a power system. The problem of UPFC-based damping controller is formulated as an optimization problem according to the eigen value-based objective function comprising the damping factor, and the damping ratio of the un-damped electromechanical modes to be solved using Bacteria Foraging Algorithm (BFA). To ensure the robustness of the proposed stabilizers, the design process takes into account a wide range of operating conditions. The effectiveness of the new controller is demonstrated through eigenvalue analysis and time-domain simulation studies show that the proposed controller has an excellent capability in damping power system oscillations.