Abstract
An operational planning problem of district heating and cooling systems which are composed of gas turbine cogeneration and heat pump/thermal storage facilities is discussed. A sensitivity-analysis-based method is proposed to obtain the charging/discharging strategy of a thermal storage tank by simple means. The effectiveness of the method is investigated from the viewpoints of computation time and accuracy of the solution, by comparing it with other methods : dynamic-programming-based, decomposition-based, and scheduling-based ones. A numerical study shows that the sensitivity-analysis-based method is effective from the viewpoint of computation time while it keeps the accuracy of solution as compared with the dynamic-programming-based or decomposition-based method. This feature is advantageous for use of the method proposed in the from of an algorithm in real-time operation and system design.
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