Abstract
Modeling of district heating network (DHN) is significant for the dynamic simulation of the heat and electricity integrated energy system (HE-IES). However, the computational accuracy and stability of the DHN model have not been fully addressed in traditional numerical methods. This paper proposes a novel DHN model to describe the thermal dynamics. Considering the bilaterally bounded and linearly hyperbolic characteristics, an extended characteristic line method (CLM) is presented to obtain the analytical solution of the DHN model in partial differential equation (PDE) form. During the dynamic simulation, the approximate error and numerical diffusion during simulation can be totally avoided based on the proposed model. The case study of a large-scale HE-IES verifies the superiority of the proposed method regarding the accuracy, stability, efficiency, and applicability.
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