Probabilistic optimal scheduling of energy limited multihydro units

Abstract

Two most important steps in generation expansion planning process are: the evaluation of reliability indices and production cost. Because of the non existent operating cost of the hydro units,. special care is taken in planning so that these units are used upto their capacity. This makes the simulation of hydro unit different from the thermal unit. The complexity in simulation increases if the hydro unit is energy limited and it grows further if more than one energy.limited hydro units compete for the same position in the loading order. Again the possible energy generation by a energy limited hydro unit is It a deterministic quantity only for a reservoir of smaller (limited) capacity for abundant water supply to the reservoir. However,this is not the case for most of the situations. This thesis presents a methodology of scheduling any number of energy limited hydro units competing for the same position in the loading order. ';!'his method is an extension of the conventional approach of simulating energy limited hydro units. This thesis also presents a novel approach of scheduling energy limited unit. This approach takes into account the randomness in energy constraints of hydro unit by developing a probabilistic model of water levels and water flows of the reservoir or of run of river. The developed methodologies are applied to IEEE Reliability Test System and Bangladesh Power System. In the numerical evaluation, the segmentation method is utilized.