Abstract
This paper describes the application of infinite terminal time case to the load frequency control of a multiple-area interconnected power system. From the viewpoint of practical application, the linear feedback controller using the instantaneous values of output variables is proved to be effective.A number of different optimal or sub-optimal output feedback controllers can be designed by selecting different estimation functions of weighting factors, Q and R.The proposal sub-optimal output feedback controller is not significantly degraded by using the abbreviation of state covariance equation. And, it is deduced that this controller is promising as a candidate for on-line computer controls, because of the simplicity of the gain solution.
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