Nonlinear effects of a robust control design

The nonlinear effects of a robust μ-synthesis power system stabilizer (MPSS) using a bifurcation subsystem-based control design methodology is studied in this paper. A normal form representation of the nonlinear power system model is introduced such that the nonlinear model can be approximated up to the second order. An MPSS is designed using a bifurcation subsystem-based control design methodology, and the second-order interaction indices of the system with MPSS and conventional excitation control are calculated. The analysis of the nonlinear effects shows that the MPSS becomes dominant in dynamics by replacing the inertial dynamics that were dominant in the original system.