Abstract
In designing energy supply systems, it is important to determine equipment capacities so that the systems are robust in economic and energy saving characteristics against the uncertainty in energy demands. In a previous paper, a revised method for the robust optimal design based on the minimax regret criterion has been proposed so that it can apply large-scale problems with many pieces of equipment and many periods for variations in energy demands. In this paper, the economic robustness of a gas engine cogeneration system with energy storage equipment is investigated using the revised method. Through a numerical study, it turns out that the capacity of the gas engine cogeneration unit decreases with an increase of the uncertatinty in energy demands, because this makes the cogeneration system disadvantageous. It also turns out that the capacity of the storage tank increases with the uncertatinty in energydemands, because this relaxes the aforementioned disadvantage.
