Coordination of the STATCOM and Power System Stabilizer Using Hybrid BF-NM Algorithm

Recent developments of Facts devices increase the importance of their coordination with the power system controllers. With regard to nonlinearities of power system, changes in the operating points, reaction between power system and STATCOM, linear methods cannot be used to design parameters of stabilizers. Therefore, in this paper, a nonlinear model of power system is considered for the coordination design of PSS and STATCOM. A hybrid method which combines bacterial foraging (BF) algorithm with Nelder-Mead (NM) method (BF-NM) is employed to coordinately design the PSS and STATCOM controllers. By combining these two methods, the search power of the intelligent methods and the precision of conventional methods are simultaneously employed. To evaluate the performance of the proposed method, it is applied on a four machine power system. Simulation results confirm the efficiency of the proposed method for stabilizing power system oscillations.