TY - JOUR
T1 - Characterization of flux pump-charging of high-temperature superconducting coils using coupled numerical models
AU - Zhou, Pengbo
AU - Ghabeli, Asef
AU - Ainslie, Mark
AU - Grilli, Francesco
N1 - Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 52107010, in part by the International Postdoctoral Exchange Fellowship Program between Helmholtz and OCPC, in part by the Natural Science Foundation of Sichuan Province under Grant 2022NSFSC1891, and in part by the Research Funds of State Key Laboratory of Rail Transit Vehicle System under Grant 2022TPL-T11. The authors kindly thank Andres E. Pantoja (Robinson Research Institute, Victoria University of Wellington) for the I c(B, θ) and n(B, θ) measurements of the HTS tape and Zhenan Jiang (from the same institution) for useful discussions about experimental measurements.
Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 52107010, in part by the International Postdoctoral Exchange Fellowship Program between Helmholtz and OCPC, in part by the Natural Science Foundation of Sichuan Province under Grant 2022NSFSC1891, and in part by the Research Funds of State Key Laboratory of Rail Transit Vehicle System under Grant 2022TPL-T11. The authors kindly thank Andres E. Pantoja (Robinson Research Institute, Victoria University of Wellington) for the I (B, θ) and n(B, θ) measurements of the HTS tape and Zhenan Jiang (from the same institution) for useful discussions about experimental measurements. c
Publisher Copyright:
© 2023 IOP Publishing Ltd.
PY - 2023/9/14
Y1 - 2023/9/14
N2 - 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 method and apply this voltage to the load HTS coil using a T − A formulation finite-element method 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.
AB - 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 method and apply this voltage to the load HTS coil using a T − A formulation finite-element method 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.
KW - numerical simulation
KW - electrical circuit model
KW - high-temperature superconductor (HTS)
KW - flux pumps
KW - HTS coils
KW - HTS modeling
KW - superconducting coil charging
KW - HTS dynamo
UR - http://www.scopus.com/inward/record.url?scp=85173135497&partnerID=8YFLogxK
U2 - 10.1088/1361-6668/acf739
DO - 10.1088/1361-6668/acf739
M3 - Article
SN - 0953-2048
VL - 36
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
IS - 11
M1 - 115002
ER -