Self-Tuning Controller for Generator Excitation Control

The design of an excitation self-tuning controller for a generator connected to an infinite bus through a long transmission line is presented in this paper. The control strategy is to minimize a cost function which incorporates fluctuia-tions of input, output, and set point with the system parameters identified in real time by a recursive-least-squares algorithm. The penalty factor used in the cost function to penalize excessive control action is selected by analysis to enhance the system stability. The salient points of the controller troller are its adaptive nature and application of a least squares formulation as a parameter estimator.