Abstract
An optimal operational planning method, using the decomposition algorithm, for cogeneration systems with thermal storage is proposed. The daily operational strategy of constituent equipment is determined together with the charging and discharging history for thermal storage so as to minimize the daily operational cost subject to the energy demand requirement. This optimization problem is formulated as a large-scale mixed-integer linear programming problem, and it is decomposed into a large-scale linear programming problem and a set of small-scale mixed-integer linear programming problems for hourly operational planning. The solution of the original problem is obtained by solving these problems iteratively. Effects of thermal storage on the operation of cogeneration systems are examined through a numerical study. The method proposed here is a useful tool for evaluating the economical and energy-saving properties of cogeneration systems with thermal storage.
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