Design of robust power system stabilizer based on PSO

Damping local mode and inter-area oscillations are two critical issues for optimal power flow and stability in a power system. Power system stabilizers (PSSs) are applied to damp these oscillations. Conventional algorithms of PSS design are based on classical control theory and eigen values based calculation and involve numerous mathematical calculations which may not present an accurate solution. In this paper, a particle swarm optimization (PSO) based PSS design is suggested which is based on time domain response of power system and also is robust for the overall credible disturbances in power system. Two-area (four-machine 11-bus) power system is considered as the case study in this paper. PSS parameters are obtained for four PSS connected to four generators. Finally, the effectiveness of the proposed algorithm is evaluated for damping the system oscillations during overall disturbances. The simulation results illustrate this issue.