A HARMONY SEARCH- FIREFLY ALGORITHM BASED CONTROLLER FOR DAMPING POWER OSCILLATIONS

This paper analysed the power oscillations of a transmission system when subjected to disturbance. When a power system is followed by a fault the transmission line power as well as the rotor angle deviates from its steady state value leading to system instability. A HS-FA based damping controller used to damp out the power oscillations along with a static synchronous series compensator. The lead lag structure of the damping controller improves the stability of the system by injecting a compensating voltage through series compensator. A harmony search - firefly hybrid optimizing technique is used to tune the controller parameters. Integral of squared error (ISE) of the rotor speed deviation is considered for analysing the controller performance. Different disturbance conditions are analysed for verifying performance of the controller to damp out the power oscillations.