An efficient approach to tune modern power system stabilizers using harmony search

A multiband power system stabilizer tuning method, in which objective is to enhance the damping of the rotor oscillations and system stability is proposed in this paper. This tuning approach is based on an efficient search algorithm known as harmony search algorithm. Robust design problem of PSS4B is considered as an optimization problem with nonlinear simulation based objective function. A single machine infinite bus (SMIB) system is evaluated under large range of loading conditions and disturbances for performance investigation of the proposed design. In order to demonstrate the effectiveness of designed PSS4B stabilizers, time domain simulations are carried out for SMIB system. Superiority of the proposed PSS4B design is proved by comparative study of transient responses with existing model of PSS4B.