The optimal operation of multi-energy systems (MES) that supply a demand formed by different energy vectors can be determined based on a given objective function with the relevant constraints. An efficient approach formulated in the literature defines an optimisation model with linear constraints considering constant efficiency or constant coefficient of performance ( COP ) of the individual equipment. This paper extends this optimisation model by considering non-linear convex expressions of the equipment efficiencies and COP s. The optimisation with linear constraints is solved in an iterative way, by updating the efficiencies and COP s at each iteration until the convergence criterion is satisfied. The results of this approach are shown for a MES that supplies electricity, heat and cooling demand in representative cases for winter and summer periods. The relevant aspects are the possibility of determining more realistic operation costs, higher than the operation costs found with constant efficiencies when the efficiency of the equipment varies in a monotonic way. Conversely, with non-monotonic variations (e.g., for the COP , when the MES serves a cooling demand), the operation costs do not increase in all cases. Finding more realistic operation costs becomes crucial in MES applications with increasing electricity and gas prices, with higher correlations occurring at high price levels. Finally, a novel graphical method is presented to indicate the MES contributions equipment in serving electricity, heat and cooling demand, also showing the upward and downward flexibility due to energy shifting in the MES.

Optimisation of Multi-Energy System Operation with Convex Efficiency Representation at Partial Loading / Piran, Cristian; Barale, Alessio; Mazza, Andrea; Chicco, Gianfranco. - In: IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS. - ISSN 0093-9994. - ELETTRONICO. - 60:4(2024), pp. 5552-5564. [10.1109/tia.2024.3395581]

Optimisation of Multi-Energy System Operation with Convex Efficiency Representation at Partial Loading

Piran, Cristian;Mazza, Andrea;Chicco, Gianfranco
2024

Abstract

The optimal operation of multi-energy systems (MES) that supply a demand formed by different energy vectors can be determined based on a given objective function with the relevant constraints. An efficient approach formulated in the literature defines an optimisation model with linear constraints considering constant efficiency or constant coefficient of performance ( COP ) of the individual equipment. This paper extends this optimisation model by considering non-linear convex expressions of the equipment efficiencies and COP s. The optimisation with linear constraints is solved in an iterative way, by updating the efficiencies and COP s at each iteration until the convergence criterion is satisfied. The results of this approach are shown for a MES that supplies electricity, heat and cooling demand in representative cases for winter and summer periods. The relevant aspects are the possibility of determining more realistic operation costs, higher than the operation costs found with constant efficiencies when the efficiency of the equipment varies in a monotonic way. Conversely, with non-monotonic variations (e.g., for the COP , when the MES serves a cooling demand), the operation costs do not increase in all cases. Finding more realistic operation costs becomes crucial in MES applications with increasing electricity and gas prices, with higher correlations occurring at high price levels. Finally, a novel graphical method is presented to indicate the MES contributions equipment in serving electricity, heat and cooling demand, also showing the upward and downward flexibility due to energy shifting in the MES.
File in questo prodotto:
File Dimensione Formato  
Optimisation_of_Multi-Energy_System_Operation_with_Convex_Efficiency_Representation_at_Partial_Loading.pdf

non disponibili

Tipologia: 2a Post-print versione editoriale / Version of Record
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 2.59 MB
Formato Adobe PDF
2.59 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
IEEE_TIA_Multienergy_second_revision_final.pdf

accesso aperto

Tipologia: 2. Post-print / Author's Accepted Manuscript
Licenza: PUBBLICO - Tutti i diritti riservati
Dimensione 1.45 MB
Formato Adobe PDF
1.45 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2991369