Optimal coordinated control of PSS and STATCOM in a multimachine power system

Abstract

To improve power system stability in this paper, a method for optimal coordinate control of power system stabilizers (PSSs) and static synchronous compensator (STATCOM) is presented. The optimal coordinated control of multiple PSSs and STATCOM is transformed into an optimization problem in which both rotor angle speed deviation between generators and load voltages deviation after fault are involved. The optimal control parameters of PSS and STATCOM controllers are obtained by employing a paired-bacteria optimizer (PBO) based algorithm. The proposed method is tested on the Western System Coordinating Council (WSCC) 3-generator 9-bus power system. To verify the effectiveness of the proposed method, PSSs and STATCOM optimized in coordinated manner are compared with PSSs optimized independently and no damping controllers. The simulation results have shown that the coordinated PSS and STATCOM controllers optimized by PBO perform efficiently in damping low-frequency oscillations and improving the load bus voltage stability.