The thyristor controlled series capacitor (TCSC) and power system stabilizer (PSS) can combine with each other for further damping and stability; therefore, their coordination is very important. In this paper, we use TCSC and PSS simultaneous controllers to increase the stability and damping of the oscillations of the two-machine power system. Then we will optimize the parameters of TCSC and PSS simultaneous controllers by velocity update relaxation particle swarm optimization (VURPSO) algorithm to improve the efficiency of the controllers designed for stability and damping of the oscillations in the power system. VURPSO algorithm complements particle swarm optimization (PSO) algorithm.

Keywords: Thyristor controlled series capacitor (TCSC), Power system stabilizer (PSS), Velocity update relaxation particle swarm optimization (VURPSO)