Generalized frequency-domain analysis for dynamic simulation and comprehensive regulation of integrated electric and heating system

Qinghan Sun, Runhang Teng, Hang Li, Yonglin Xin, Huan Ma, Tian Zhao and Qun Chen

Applied Energy, 2024, vol. 372, issue C, No S0306261924012005

Abstract: Comprehensive dispatch of integrated electric and heating systems (IEHS) has shown great potential in promoting energy utilization efficiency, where an effective modelling of district heating system (DHS) is crucial. Herein, a new frequency-domain-based model is proposed to reflect full heat transport dynamics in DHS considering variation of both temperatures and fluid flow rates. Numerical tests on a highly branched DHS demonstrate the high accuracy of the proposed model under various flow conditions. The proposed model has a general error less than 1K and outperforms the popular node method and finite difference method with less temporal sampling points. A primal-decomposition-based rolling-horizon approach is also proposed to optimize the IEHS in variable flow and variable temperature (VF-VT) mode using the new physical model. The results on a 45-node IEHS show the effectiveness of the proposed model and optimization approach, where the total operation cost is reduced by 3.4% compared with optimization without regulation of flow rates.

Keywords: Integrated electric and heating system; District heating system; Frequency-domain analysis; Fourier transform; Rolling-horizon optimization (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.123817

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