Numerical modelling of dynamic resistance in high-temperature superconducting coated-conductor wires
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In this paper, a 2D numerical model based on the finite element method and implementing the H -formulation is used to calculate the dynamic resistance and total AC loss in a coated-conductor HTS wire carrying an arbitrary DC transport current and exposed to background AC magnetic fields up to 100 mT.Abstract:
© 2018 IOP Publishing Ltd. The use of superconducting wire within AC power systems is complicated by the dissipative interactions that occur when a superconductor is exposed to an alternating current and/or magnetic field, giving rise to a superconducting AC loss caused by the motion of vortices within the superconducting material. When a superconductor is exposed to an alternating field whilst carrying a constant DC transport current, a DC electrical resistance can be observed, commonly referred to as 'dynamic resistance.' Dynamic resistance is relevant to many potential higherature superconducting (HTS) applications and has been identified as critical to understanding the operating mechanism of HTS flux pump devices. In this paper, a 2D numerical model based on the finite-element method and implementing the H -formulation is used to calculate the dynamic resistance and total AC loss in a coated-conductor HTS wire carrying an arbitrary DC transport current and exposed to background AC magnetic fields up to 100 mT. The measured angular dependence of the superconducting properties of the wire are used as input data, and the model is validated using experimental data for magnetic fields perpendicular to the plane of the wire, as well as at angles of 30° and 60° to this axis. The model is used to obtain insights into the characteristics of such dynamic resistance, including its relationship with the applied current and field, the wire's superconducting properties, the threshold field above which dynamic resistance is generated and the flux-flow resistance that arises when the total driven transport current exceeds the field-dependent critical current, I c( B ), of the wire. It is shown that the dynamic resistance can be mostly determined by the perpendicular field component with subtle differences determined by the angular dependence of the superconducting properties of the wire. The dynamic resistance in parallel fields is essentially negligible until J c is exceeded and flux-flow resistance occurs.read more
Citations
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Journal ArticleDOI
Review of High Temperature Superconducting Flux Pumps
TL;DR: In this paper , the authors provide an in-depth review on the HTS flux pumps developed in the last decade, focusing on their working principles and technical advances, along with their potential future applications.
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Numerical Study on Dynamic Resistance of an HTS Switch Made of Series-Connected YBCO Stacks
Jintao Hu,Jun Ma,Jiabin Yang,Mengyuan Tian,Adil Shah,Ismail Patel,Haigening Wei,Luning Hao,Yavuz Ozturk,Boyang Shen,Tim Coombs +10 more
TL;DR: In this paper, a series-connected YBCO stack was used to obtain insights into the characteristics of dynamic resistance and power loss, including their relationship with the amplitude and the frequency of the AC magnetic field.
Journal ArticleDOI
Dynamic loss of HTS field windings in rotating electric machines
TL;DR: In this article, the authors investigated the dynamic loss in HTS coated conductors (CCs) using an H-formulation based numerical model for a wide range of combined DC and AC magnetic fields under various load conditions, and two different methods have been used for calculating dynamic loss.
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Sharp demagnetization of closed-loop HTS coil in first cycle of external AC fields induced by unexpected dynamic resistance
Zhuoyan Zhong,Wei Wu,Zhijian Jin +2 more
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The Field Decay Characteristic for a Closed HTS No-Insulation Coil With Partial Tape Exposed to an AC Magnetic Field
TL;DR: In this paper, the correction curve for closed no-insulation (NI) coils with partial tape exposed to an ac magnetic field is calculated by field-decay method, which has a wider measurement range and higher accuracy than four-probe method.
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