Abstract
A new practical load frequency control scheme based on optimal control theory is proposed. In the proposed scheme, the sustained component of load fluctuations for ten minutes ahead is predicted via a Kalman filter taking into account the daily information. The predicted load is allocated to all regulating plants according to the economic load dispatching rule. Thermal plants regulate their output powers independently of each other so as to generate the allocated powers following the optimal control rule. Both the fringe component of load fluctuation and the error of load prediction are regulated by hydroplants. The proposed control scheme can be applied to actual power systems without major modification of existing control equipment. Effectiveness of the proposed scheme is confirmed by simulation tests based on the measured data.
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