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scheduling of thermal plants, including the effects of transmission losses, has been well developed in recent years. This article presents a method for short-range optimum economic scheduling of a thermal-hydroelectric power system with transmission losses rigorously considered.The optimum scheduling problem as considered here is defined as follows : When using desired amounts of water from the hydroelectric plants over a given period of time, it is desired to minimize the total fuel input in dollars.If it is assumed that, for the period of time under con sideration, the hydroelectric plants operate at essentially constant head, the co-ordination equations whose solution gives the optimum schedule are dF n òLr

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