Browsing by Author "Pistikopoulos, Efstratios N."
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Item Open Access Optimization of a network of compressors in parallel: Operational and maintenance planning – The air separation plant case(Elsevier, 2015-03-13) Kopanos, Georgios M.; Xenos, Dionysios; Cicciotti, Matteo; Pistikopoulos, Efstratios N.; Thornhill, F.A general mathematical framework for the optimization of compressors operations in air separation plants that considers operating constraints for compressors, several types of maintenance policies and managerial aspects is presented. The proposed approach can be used in a rolling horizon scheme. The operating status, the power consumption, the startup and the shutdown costs for compressors, the compressor-to-header assignments as well as the outlet mass flow rates for compressed air and distillation products are optimized under full demand satisfaction. The power consumption in the compressors is expressed by regression functions that have been derived using technical and historical data. Several case studies of an industrial air separation plant are solved. The results demonstrate that the simultaneous optimization of maintenance and operational tasks of the compressors favor the generation of better solutions in terms of total costs.Item Open Access A rolling horizon optimization framework for the simultaneous energy supply and demand planning in microgrids(Elsevier, 2015-06-25) Silvente, Javier; Kopanos, Georgios M.; Pistikopoulos, Efstratios N.; Espuña, AntonioThis work focuses on the development of optimization-based scheduling strategies for the coordination of microgrids. The main novelty of this work is the simultaneous management of energy production and energy demand within a reactive scheduling approach to deal with the presence of uncertainty associated to production and consumption. Delays in the nominal energy demands are allowed under associated penalty costs to tackle flexible and fluctuating demand profiles. In this study, the basic microgrid structure consists of renewable energy systems (photovoltaic panels, wind turbines) and energy storage units. Consequently, a Mixed Integer Linear Programming (MILP) formulation is presented and used within a rolling horizon scheme that periodically updates input data information.