Numerical study for the impact of current sharing effect upon dynamic behaviour of DC-carrying HTS coils under alternating magnetic fields

Zhai, Yao; Ma, Guangtong; Li, Jing; Zhou, Pengbo; Ren, Gang; Zhou, Yanyu

doi:10.1016/j.cryogenics.2023.103730

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…E c is the critical electric field, typically equal to 1 µV cm −1 , and n is the transition index. In this model, the critical current density J c is defined by a modified Kim's relation [62] to account for the impact of the magnetic field on the electromagnetic behavior of the tape, so that,…”

Section: Data Availability Statementmentioning

confidence: 99%

FEM-Circuit co-simulation of superconducting synchronous wind generators connected to a DC network using the homogenized J–A formulation of the Maxwell equations

Durante-Gómez,

Trillaud,

dos Santos

et al. 2024

Supercond. Sci. Technol.

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High-temperature superconductors (HTS) are greatly appealing for the development of high efficient, and high energy density power devices. They are particularly relevant for applications requiring light and compact machines such as wind power generation. In this context, to ensure the proper design of the superconducting machines and their reliable operation in power systems, it is then important to develop models that can accurately include their physics but also can describe properly their interaction with the system. Thus, one approach is the co-simulation. The goal of the present work is to put to use this numerical technique when superconducting components are involved. Here, the case study is a 15 MW hybrid superconducting synchronous generator (HTS rotor and conventional stator) coupled to a direct current (DC) network via a rectifier and its associated filter. The case study related to wind power application allows grasping the technical issues when employing co-simulation dealing with HTS machines. The FEM of the generator is done in COMSOL Multiphysics, which interacts with the circuit simulator Simulink through the built-in Functional Mock-up Unit (FMU). For the present study, a new version of the latest J-A formulation combined with homogenization technique is introduced allowing an even faster computation time compared to the T-A formulation. Distributed variables and global variables such as current density, magnetic flux density, and local losses for the former and voltage, current, electromagnetic torque, and power quality for the latter are estimated and compared for both formulations. The idea is to find the best-suited combination FEM-circuit under criteria of computational speed, accuracy, and numerical stability. It is then shown that all formulations generate an error of less than 5% on the machine parameters; and the J-A formulation with first order elements stands out with a significant 4-fold reduction in computational costs.

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Section: Data Availability Statementmentioning

confidence: 99%

FEM-Circuit co-simulation of superconducting synchronous wind generators connected to a DC network using the homogenized J–A formulation of the Maxwell equations

Durante-Gómez,

Trillaud,

dos Santos

et al. 2024

Supercond. Sci. Technol.

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Fast and accurate 3D FEM model for electromagnetic simulations of no-insulation HTS coils based on polygon-anisotropic-resistivity

Zhong,

Wu,

Jin

2024

Supercond. Sci. Technol.

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For no-insulation (NI) high-temperature superconducting (HTS) coils, a 3D electromagnetic model, which is fast and accurate, conducive to establish, and straightforward to muti-physics coupling, is still required. This paper introduces a polygon-anisotropic-resistivity (PAR) method for 3D FEM electromagnetic simulations of NI HTS coils. This model avoids dividing each tape into the specific HTS-tape layer and turn-to-turn contact layer, which yields: (1) a reduced computational burden; (2) improved convergence due to smaller element aspect ratios. The significance of the polygon-anisotropic-resistivity method lies in its indispensable role in achieving a 3D anisotropic-resistivity model with high computing speed and accuracy. The proposed PAR model is rigorously evaluated through three types of simulations: (1) charge and discharge tests; (2) AC losses of the NI coil subjected to AC fields with a DC current supply; (3) heat-triggered quench and recovery scenarios. For these simulations, the PAR model is validated by comparisons with the full-element model, namely, the 3D FEM model that explicitly incorporates each specific HTS-tape layer and turn-to-turn contact layer in the H-formulation model. Good consistency is observed. The computing speed of the PAR model is tested to be 12-38 times that of the full-element model with the same accuracy. The PAR model achieves a 40 % reduction in degrees of freedom compared to the full-element model, with the same mesh density along the HTS tape width and length, facilitating more precise and larger scale coil simulations within the same computational memory limits. Additionally, the PAR model entirely eliminates the inherent inaccuracies found in the conventional-anisotropic-resistivity 3D model, which stem from discrepancies between the arranged anisotropic-resistivity and the actual computed coil meshes. The proposed PAR model will enhance the prevalence of 3D electromagnetic analyses of NI HTS coils.

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Influence of J _c(B, ${\rm{\theta }}$) on Dynamic Resistance and Total Loss in REBCO Coated Conductors Under Various External Field Orientation

Li,

Jiang,

Chen

et al. 2025

IEEE Trans. Appl. Supercond.

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Numerical study for the impact of current sharing effect upon dynamic behaviour of DC-carrying HTS coils under alternating magnetic fields

Cited by 3 publications

References 27 publications

FEM-Circuit co-simulation of superconducting synchronous wind generators connected to a DC network using the homogenized J–A formulation of the Maxwell equations

FEM-Circuit co-simulation of superconducting synchronous wind generators connected to a DC network using the homogenized J–A formulation of the Maxwell equations

Fast and accurate 3D FEM model for electromagnetic simulations of no-insulation HTS coils based on polygon-anisotropic-resistivity

Influence of J _c(B, ${\rm{\theta }}$) on Dynamic Resistance and Total Loss in REBCO Coated Conductors Under Various External Field Orientation

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Numerical study for the impact of current sharing effect upon dynamic behaviour of DC-carrying HTS coils under alternating magnetic fields

Cited by 3 publications

References 27 publications

FEM-Circuit co-simulation of superconducting synchronous wind generators connected to a DC network using the homogenized J–A formulation of the Maxwell equations

FEM-Circuit co-simulation of superconducting synchronous wind generators connected to a DC network using the homogenized J–A formulation of the Maxwell equations

Fast and accurate 3D FEM model for electromagnetic simulations of no-insulation HTS coils based on polygon-anisotropic-resistivity

Influence of J c(B, ${\rm{\theta }}$) on Dynamic Resistance and Total Loss in REBCO Coated Conductors Under Various External Field Orientation

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Product

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Influence of J _c(B, ${\rm{\theta }}$) on Dynamic Resistance and Total Loss in REBCO Coated Conductors Under Various External Field Orientation