Novel dynamic equivalent circuit model of integrated energy systems

Chen, Jing; Li, Fan; Li, Haoran; Sun, Bo; Zhang, Chenghui; Liu, Shuai

doi:10.1016/j.energy.2022.125266

Cited by 10 publications

(17 citation statements)

References 39 publications

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“…The time-step size is set to 1 s. For the purpose of comparison, the same study has been also simulated using the distributed-element circuit model in [24] and the pipe model in [15]. The pipe model in [15] is a lumped-element equivalent circuit model. Owing to the difficulty of obtaining analytical solutions through theoretical calculations, the simulation obtained by an existing pipe model available in Dymola is considered here as a reference for comparison [17,24].…”

Section: Simulation Of Temperature and Mass Rate Flow Step Responses ...mentioning

confidence: 99%

“…Based on the analogies, the thermal transients may be modelled using equivalent circuits. The thermal-electrical analogy has been successfully applied to the modelling and analysis of thermal systems in [11][12][13][14][15]. The reader is referred to these references for a more detailed description.…”

Section: Review Of Thermal-electrical Analogymentioning

confidence: 99%

“…The pipe model is divided into N = 50 segments. The time-step size is set to 1 s. For the purpose of comparison, the same study has been also simulated using the distributed-element circuit model in [24] and the pipe model in [15]. The pipe model in [15] is a lumped-element equivalent circuit model.…”

Section: Simulation Of Temperature and Mass Rate Flow Step Responses ...mentioning

confidence: 99%

“…The black dotted line represents the simulation results obtained with the distributed-element circuit model. The orange dash-dot line represents the simulation results obtained with the lumped-element model in [15]. The red dashed line denotes the reference values from the model in Dymola.…”

Section: Simulation Of Temperature and Mass Rate Flow Step Responses ...mentioning

confidence: 99%

“…They are computationally intensive and may be prone to convergence problems [10]. In [11][12][13][14][15], the analysis methods of electrical circuits are applied to thermal systems based on the electric circuit analogy. In [11], an equivalent electrical circuit composed of resistance and capacitance is proposed for unsteady-state analyses of wall heat transfer.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Lumped‐element equivalent circuit modelling of district heating pipe in electromagnetic transients program

Jiang,

Xia,

Lan

et al. 2024

The Journal of Engineering

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Electromagnetic transients program (EMTP) is widely used to analyze transients in power systems. With the increased interest in integrated energy systems (IESs), it would be beneficial to extend the application of EMTP to multi‐physics transients in integrated electrical and heating networks. In this paper, an accurate and efficient lumped‐element circuit model of the heating district pipe is developed in EMTP. The pipe is split into segments using spatial discretization. The application of the numerical discretization to the energy conservation equation gives the discretized pipe equation which is expressed in the form of a companion model of EMTP. In order to reduce the computational effort, the time‐varying terms in the admittance matrix of the companion model of pipe are eliminated. The modification of the admittance matrix is avoided. Furthermore, the internal nodes resulting from spatial discretization are eliminated, resulting in a lumped‐element circuit model with only two external nodes. Case studies are carried out to validate the proposed model in terms of accuracy and efficiency. The 2‐norm error of the proposed model is 0.0153%. With a pipe length of 100 m, the computational speed of the proposed model is increased by a factor of 2.94 compared with the existing distributed‐element circuit model. The implementation of the proposed pipe model in the EMTP‐type simulator enables the analysis of multi‐physics transients in a multi‐carrier energy system.

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