On the design of output feedback excitation controllers of synchronous machines

Optimal output controllers for high-speed excitation systems of synchronous machines, using constant and/or dynamic feedback gains, are discussed in this paper. A general problem formulation and solution are presented. A number of combinations of measurable output variables are used for control. Also, several random characteristics of the system initial state are used in the incomplete output feedback controllers' design. Effectiveness of the stabilizers are tested subjecting the system to a small input disturbance and a three-phase-to-ground fault.