NONLINEAR EXCITATION AND GOVERNOR CONTROL USING VARIABLE STRUCTURES

Modern microprocessor capabilities permit the control designer to cons ider using relatively complicated nonlinear control algorithms, which would have been considered impractical in the past. This paper present s the results of a study of the variable structure control technique f or the design of excitation and governor controllers for a power syste m. Control laws for rotor angle and field flux are derived. The closed loop system is shown to be asymptotically stable. The system can be t ransferred to a new operating condition corresponding to any desired t erminal voltage V(t) and tie-line power P(tie).