Aggregate power flexibility of multi-energy systems supported by dynamic networks

Hengyi Li, Boyu Qin, Shihan Wang, Tao Ding, Jialing Liu and Hongzhen Wang

Applied Energy, 2025, vol. 377, issue PB, No S0306261924019482

Abstract: The multi-energy system, encompassing electricity networks, district heating networks (DHNs), and hydrogen-enriched compressed natural gas (HCNG) networks, provides an alternative for promoting intermittent renewable energy accommodation and enhancing operational flexibility. This paper investigates the aggregate flexibility of the multi-energy system based on dynamic network models and admissible power fluctuation regions of decomposed subsystems. The dynamic processes within HCNG networks/DHNs are analyzed, and the inner-box method is employed to approximately quantify the individual flexibility of the dynamic networks. Furthermore, the optimal dispatchable regions of decomposed subsystems, accounting for internal gas/heating load uncertainties, are evaluated based on distributionally robust optimization. Through distribution-level power aggregation, the flexibility of the multi-energy system is quantified utilizing geometric methods. Numerical results on two test systems verify the effectiveness of the proposed methodology.

Keywords: Multi-energy system; Flexibility evaluation; Robust optimization; Dynamic network; Uncertainty (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.apenergy.2024.124565

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