Optimized Design of Wide-Area PSS for Damping of Inter-Area Oscillation

In this paper a genetic algorithm based wide area power system stabilizer (PSS) in a multi machine power system for damping of low frequency inter-area oscillations has been presented. The wide area PSS is consists of two stages, the input of one stage is a local signal and the input of other is a global signal. To select the most effective stabilizing signals and the location of controller, Geometric measure of controllability and observability is used. The most effective input signal found is the tie line active power flow deviation. Time domain based objective function is minimized, in which deviation in the oscillatory rotor speed of generator is involved so that the stability performance of the system is improved. Two area - four machine systems have been used as a test system here.