Computer evaluation of selected power system stabilizer designs

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1977

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Abstract

Dynamic stability problems of a generator connected to an infinite bus through a transmission line have been studied previously. In this thesis an analysis of this stability problem is undertaken using modern control techniques. A nonlinear model of the generator together with its automatic voltage regulator is obtained, and is then linearized about the operating point. Four different types of power system stabilizers are designed on the basis of this linearized model. Dynamic stabilizer designs have been proposed by industry people, and these designs will serve as a standard of comparison. Modern control theory is used herein to obtain other stabilizers. The effectiveness of these stabilizers is tested by subjecting the system to a pulse disturbance. Time responses of the state variables are then compared to those resulting from the use of a dynamic stabilizer. It is found that there is a definite improvement in terminal voltage and internal frequency damping when stabilizers based on modern control are implemented. Cost functions are also compared in order to more completely specify the overall performance of the stabilizers.

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