Comparison of Pole Placement Technique and Genetic Algorithm Technique for tuning stabilizers in Power system

The problem of damping low frequency oscillations in the range of 0.2 – 3 Hz observed in power systems has been the major concern these days. Power System Stabilizers (PSS) are commonly used to damp these low frequency oscillations. The parameters of the PSS (gain, phase lead time constant) are tuned by considering the single machine connected to infinite bus system (SMIB). Tuning of these parameters for the system considered can be done using various design techniques. In this paper mainly two types of PSS are used to damp these low frequency oscillations one is speed based lead-lag stabilizer and the other is derivative type power based stabilizer. Tuning of parameters for both these stabilizers are done using pole assignment technique and genetic algorithm over various operating conditions of power system and the results of both the techniques are compared.Genetic Algorithm toolbox is used along with MATLAB/SIMULINK for simulation. Keywords—Power system stabilizer (PSS), power system oscillations, SMIB, Pole placement Technique, Genetic Algorithm.