3.1 INTRODUCTION

Chapters 1 and 2 are confined to the allocation of system load amongst thermal generating units. However, a power system may consist of thermal as well as hydel generating units. The objective of the power system engineer should rather be stated as the allocation of load optimally between hydel and thermal units to obtain minimum fuel cost. The cost of generation can be influenced to a great extent by considering hydel plants as the water does not cost much and is some times available free of cost. The economic scheduling problem involving both hydro and thermal generating units is very complex as compared to units involving thermal units only. Scheduling amongst thermal units need not consider social obligations except those ...

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