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A CHS based PID Controller for Unified Power Flow Controller

This paper presents a method for designing of proportional-integral-derivative (PID) controller based on unified power flow controller (UPFC) using chaotic harmony search algorithm (CHS) for damping of low frequency oscillations (LFO) in a power system. The main aim of this paper, optimization of selected gains with the time domainbased objective function which is solved by chaotic harmony search algorithm. The performance of the proposed singlemachine infinite-bus system (SMIB) equipped with UPFC controllerbased PID controller is evaluated under various disturbances and operating conditions. The effectiveness of the proposed UPFC controller based on PID controller to damp out of oscillations over a wide range of operating conditions and variation of system parameters is showed in simulation results and eigenvalue analysis.