Charging process simulation of a coil by a self-regulating high-T superconducting flux pump

Zhou, Pengbo; Zhou, Yanyu; Ainslie, Mark; Ghabeli, Asef; Grilli, Francesco; Ma, Guangtong

doi:10.1016/j.supcon.2023.100061

Cited by 2 publications

(1 citation statement)

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“…Geng and Coombs built a 2D H-formulation to simulate the transformer-rectifiertype HTS flux pump, which is useful for gaining a fundamental understanding of the system, but limited to the practical application due to a number of simplifications [27]. Later, Zhou et al proposed a model for the self-regulating HTS flux pump, which is able to capture all the critical factors [28].…”

Section: Introductionmentioning

confidence: 99%

Characterization of flux pump-charging of high-temperature superconducting coils using coupled numerical models

Zhou,

Ghabeli,

Ainslie

et al. 2023

Supercond. Sci. Technol.

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Flux pumps provide a promising solution for contactless charging of high-temperature superconducting (HTS) coils, eliminating the need for bulk current leadsand reducing the heat burden for the cryogenic system. Characterizing the nonlineareffects of an HTS coil charged by a flux pump and understanding the dynamics ofthe charging process is essential for promoting the practical application of flux pumps.Numerical models provide a fast and cost-effective way of achieving this. In this study,we propose a methodology for coupling HTS coil and flux pump models using anelectrical circuit, resulting in reduced computation costs. We validate the effectivenessof our approach against the experimental results of an HTS coil charged by a dynamo-type flux pump. Specifically, we obtain the voltage produced by the HTS dynamo usinga 3D model based on the minimum electromagnetic entropy production (MEMEP)method and apply this voltage to the load HTS coil using a T-A formulation finite-element method (FEM) model coupled via an electrical circuit. The simulated chargingcurrent shows good agreement with experimental observations, validating our modelingstrategy. The results demonstrate that the flux flow state in the HTS coil is theprimary factor limiting the charging performance of the HTS dynamo as the chargingcurrent approaches the coil’s critical current. Furthermore, based on the simulation,we demonstrate that, when using flux pumps, it is advisable to leave a margin betweenthe operating current and the critical current of the coil. Overall, our approach hasthe potential to be applied to HTS coils charged by any device.

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Section: Introductionmentioning

confidence: 99%