A new long-term hydro production scheduling method for maximizingthe profit of hydroelectric systems

摘要

This paper presents a new long-term hydrothermal productionnscheduling method. The proposed method maximizes the profit ofnhydroelectric plants, based on the monthly energy requirement of thensystem, instead of minimizing the production cost of thermal units. Itnis shown that different forms of composite thermal marginal costs willnlead to the same hydro production schedule. Thus a linear marginal cost,nthe simplest form, is sufficient for long-term hydrothermal scheduling.nA linear hydro marginal profit is also sufficient for this purpose. Annimmediate conclusion is that an actual composite thermal cost function,nwhich is complicated by thermal unit availability, may not be needed fornthe long-term optimal hydrothermal scheduling. Due to thisnsimplification, traditional long and mid-term hydrothermal scheduling, ancomplicated problem, becomes easier to solve. The method can be used bynthe owners of independent hydro plants in a region for long-termnhydroelectric scheduling under both deregulation and competition. A casenstudy shows that the model allocates successfully and efficiently thenhydroelectric resources to peak demand periods with negligiblencomputation time