Calculation of alternating current losses in stacks and coils made of second generation high temperature superconducting tapes for large scale applications
Victor M. R. Zermeno,Asger Bech Abrahamsen,Nenad Mijatovic,Bogi Bech Jensen,Mads Peter Sørensen +4 more
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TLDR
In this article, a homogenization method to model a stack of second generation High Temperature Superconducting tapes under AC applied transport current or magnetic field has been obtained, where the idea is to find an anisotropic bulk equivalent for the stack such that the geometrical layout of the internal alternating structures of insulating, metallic, superconducting, and substrate layers is washed out while keeping the overall electromagnetic behavior of the original stack.Abstract:
A homogenization method to model a stack of second generation High Temperature Superconducting tapes under AC applied transport current or magnetic field has been obtained. The idea is to find an anisotropic bulk equivalent for the stack such that the geometrical layout of the internal alternating structures of insulating, metallic, superconducting, and substrate layers is “washed” out while keeping the overall electromagnetic behavior of the original stack. We disregard assumptions upon the shape of the critical region and use a power law E–J relationship allowing for overcritical current densities to be considered. The method presented here allows for a computational speedup factor of up to 2 orders of magnitude when compared to full 2-D simulations taking into account the actual dimensions of the stacks without compromising accuracy.read more
Citations
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Journal ArticleDOI
A homogenised anisotropic J-model for accelerating computations of screening current profile in large-scale HTS magnets
Xiang Kang,Xingzhe Wang +1 more
TL;DR: In this paper , an improved J-model approach based on a homogenized anisotropic (HA) scheme was proposed for large-scale HTS magnet systems to decrease the number of elements and enhance calculation efficiency.
Book ChapterDOI
Rotating Machines Based on Superconducting Materials
TL;DR: In this paper , the A-V Formulation of Maxwell Equations (A-VFE) was used to compute the transient AC current losses of superconducting rotating machineries, like generators.
Journal ArticleDOI
Loss analysis of superconducting wireless charging for electric vehicles
TL;DR: In this article, the authors investigated the transport current and magnetization loss of HTS coils in the frequency relevant to WPT for EVs, and a comparison between the full anisotropic dependency of the critical current and only considering perpendicular field components was conducted.
Journal ArticleDOI
Time-variant magnetic field, voltage, and loss of no-insulation (NI) HTS magnet induced by dynamic resistance generation from external AC fields
Zhuoyan Zhong,Wei Wu,Li-jie Lu,Boyang Shen,Fangliang Dong,Longbiao Wang,Zhiyong Hong,Zhijian Jin +7 more
TL;DR: In this paper , the authors studied the effect of dynamic resistance on high-temperature superconducting (HTS) coils serving as DC magnets under non-negligible AC fields, like in synchronous machines of maglev trains and wind turbines.
References
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Book
The Finite Element Method in Electromagnetics
TL;DR: The Finite Element Method in Electromagnetics, Third Edition as discussed by the authors is a leading textbook on the finite element method, incorporating major advancements and further applications in the field of electromagnetic engineering.
Journal ArticleDOI
Magnetization and Critical Supercurrents
TL;DR: In this paper, a critical current density relation alpha /J = B/sub 0/ + B is deduced for Nb/sub 3/Sn and 3Nb-Zr.
Journal ArticleDOI
Numerical solution of critical state in superconductivity by finite element software
TL;DR: In this paper, a numerical method is proposed to analyse the electromagnetic behavior of systems including high-temperature superconductors (HTSCs) in time-varying external fields and superconducting cables carrying AC transport current.
Journal ArticleDOI
Development of an edge-element model for AC loss computation of high-temperature superconductors
TL;DR: In this article, a new numerical model for computing the current density, field distributions and AC losses in superconductors is presented, based on the direct magnetic field H formulation without the use of vector and scalar potentials.
Book
Computational Electromagnetism: Variational Formulations, Complementarity, Edge Elements
TL;DR: In this article, the Scalar Magnetic Potential (SGP) approach is used to solve the problem of approximating the SGP with respect to the Wasserstein equation. But this approach is not suitable for all applications.