Current decay and compensation of a closed-loop HTS magnet in non-uniform magnetic fields based on electro-magneto-thermal semi-analytical analysis

Lingfeng Zhu, Yinshun Wang, Yuetong Guo, Wei Liu and Chengyang Hu

Energy, 2023, vol. 277, issue C

Abstract: High temperature superconducting (HTS) magnet has the potential to be applied in superconducting energy storage, superconducting magnetic levitation, etc. However, the magnet will undergo current decay when exposed to an external AC magnetic field. In this paper, based on our recently proposed closed-loop HTS magnet powered by flux pump, the current decay in non-uniform external AC magnetic fields is investigated numerically, experimentally, and analytically. The current compensation of the magnet in external magnetic fields by the flux pump is also studied. The field shielding method for the magnet is designed as well. To accurately analyze the above-mentioned processes, an electro-magneto-thermal semi-analytical solution of the magnet is established, in which the one-dimensional heat circuit model is added to our previous semi-analytical solution to describe the influence of temperature change on the magnet. The results show that when suggested field shielding method is adopted, the current can be compensated further to a higher saturation level. The proposed solution of the HTS magnet is proved to be accurate and efficient. This work provides a guidance for the operations of a closed-loop HTS magnet under external magnetic fields. And the proposed solution can be used in other closed-loop HTS magnets energized by flux pump.

Keywords: Current decay and compensation; Closed-loop HTS magnet; Semi-analytical solution; Electro-magneto-thermal; Flux pump (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:277:y:2023:i:c:s0360544223009544

DOI: 10.1016/j.energy.2023.127560

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