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EXCITATION CONTROLLER DESIGN USING H-CONTROL WITH MULTIRATE OUTPUT OF A SYNCHRONOUS MACHINE
*Boglou A. K., Casini E., Pappas D.I. and De Vecchis M.
In this paper an H? -control technique is presented and applied to the design of optimal multirate-output controllers. The technique is based on multirate-output controllers (MROCs) having a multirate sampling mechanism with different sampling period in each measured output of the system. It relies mainly on the reduction, under appropriate conditions, of the original H? -disturbance attenuation problem to an associated discrete H? -control problem for which a fictitious static state feedback controller is to be designed, even though some state variables are not available (measurable) for feedback purposes. The proposed H?-control technique is applied to the discrete linear openloop system model which represents a 160 MVA synchronous machine with automatic excitation control system, in order to design a proper optimal multirate excitation controller for this power system.[Full Text Article]