Optimal control of power system generators incorporating nonlinear state feedback

Linear and nonlinear optimal controllers have been designed for a seventh-order nonlinear model of a single machine power system through excitation and governor reference settings to improve the transient performance of the system and to satisfy stability and other soft constraints. It is shown that nonlinear controllers improve the performance of the system under large disturbances. It is also shown that acceptable system performance can be obtained with reduced number of feedback signals.