Abstract
The couplings between different types of energy networks are receiving increasing attention, especially in distribution networks. One of the fundamental topics of interest is the dynamic coupling between power grids and gas networks. To study dynamics in gas pipelines and the interaction between gas networks and electric power grids, dynamic modeling of gas networks gives the foundation. Commercial software is available and mature, but has flaws: (1) time-consuming simulation and complex implementation, and (2) the interface to electric power grids is not friendly. In this paper, transfer functions (TFs) are used to model a single pipeline. To model a gas network with multiple pipelines, a universal networking method is proposed. The accuracy of transfer function models are thoroughly examined under step and sinusoidal excitations, and the influence factors of accuracy is investigated. The adaptability of TF models is then quantitated by reference curves. Finally, the proposed modeling approach is applied in analyzing a gas-electricity system to test its capabilities.
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