Optimization in Short-Term Operation of Hydro Power Systems

The paper describes the use of an advanced optimization tool for short term scheduling of hydro power systems. The tool takes into account mixed-integer formulation and hence, startup costs for the start-up of units can be accounted for. The goal has been to quantify the improvements in cost reduction by using such a tool, and to see how this will influence upon the daily production planning. The analyses are made from a postspot-view, meaning that the spot market has been cleared and the selling and buying volumes for the next day are given. The problem formulation will then be to cover the load obligations for the next day, given a cost minimizing objective, all relevant constraints taken into account. The analyses show a potential for significant cost reduction. This cost reduction is mainly due to improved total efficiency, and a more optimal dispatch and a reduction in start and stop costs.