COLLABORATION OF PSS AND TCSC CONTROLLERS IN MULTIMACHINE AREA TO MITIGATE POWER SYSTEM OSCILLATIONS

Simultaneous incorporated application of Thyristor Controlled Series Capacitor (TCSC) and Power System Stabilizers (PSSs) in multi-machine power systems under different loading conditions is presented in this paper. As a search strategy, the Imperial Competitive Algorithm (ICA) is used to find the parameters of optimal controllers. For the purpose of enhancing system stability performance the recommended objective function, containing the speed deviations between generators, has to be minimized. For comparison, the application of PSS and TCSC exclusively and then together is tested. The results indicate that simultaneous usage of incorporating controllers based on bacterial swarm has damping performance more robust than exclusive application of optimized PSS controller based on ICA (ICAOPSS) and optimized TCSC controller based on ICA (ICATCSC) under different disturbances and in a wide range of operating conditions. Furthermore, the results are calculated with the Bacteria Foraging Optimization Algorithm (BFOA) as well as Genetic Algorithm (GA), which concludes the superiority of ICA over the other methods to achieve a global optimal solution.