Temperature Distribution in the Field Coil of a 500-kW HTS AC Homopolar Motor

Glowacki, Jakub; Sun, Yu; Storey, J. G.; Huang, Taotao; Badcock, Rodney A.; Jiang, Zhenan

doi:10.1109/tasc.2021.3128347

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…Electrical equipment made from high temperature superconductor (HTS) has the merits of compact structure, high energy density and low energy consumption level owing to the unique properties of HTS conductors. After decades of investigation and development, HTS devices [1], such as transmission cables [2], generators [3,4], motors [5][6][7], transformers [8] and ultra high-field research magnets [9][10][11] are close to maturity.…”

Section: Introductionmentioning

confidence: 99%

Coupling electromagnetic numerical models of HTS coils to electrical circuits: multi-scale and homogeneous methodologies using the T-A formulation

Zhou¹,

Santos²,

Ghabeli³

et al. 2022

Supercond. Sci. Technol.

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Numerical simulation is an effective tool for predicting the electromagnetic behavior of superconductors. Recently, a finite element method (FEM)-based model coupling the T-A formulation with an electrical circuit has been proposed: the model presents the superconducting constituent as a global voltage parameter in the electrical circuit. This allows assessing the overall behavior of complex high-temperature superconductor (HTS) systems involving multiple power items, while keeping a high degree of precision on the presentation of local effects. In this work, the applicability of this model has been extended to large-scale HTS applications with hundreds or thousands of tapes by referring to two widely recognized methodologies, multi-scale and homogenization, to improve the computation efficiency. Based on the two approaches, three different models were developed and their effectiveness was assessed using the case study of a 1000 turn cylindrical HTS coil charged by a DC voltage source. The comparison of the calculated global circuit parameters, local field distributions, losses, and computation time proves that the computation efficiency can be improved with respect to a model simulating all HTS tapes, without compromising accuracy. The results indicate that the developed models can therefore be efficient tools to design and optimize large-scale HTS devices used in electrical machines and power grids. Besides, it is found that the inductance of an HTS coil is varied according to the transport current and could even be higher than that of a normal conductor coil with the same geometry. We attribute this result to the superconductor's non-uniform current distribution and relaxation effect during the dynamic process.

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Section: Introductionmentioning

confidence: 99%

Coupling electromagnetic numerical models of HTS coils to electrical circuits: multi-scale and homogeneous methodologies using the T-A formulation

Zhou¹,

Santos²,

Ghabeli³

et al. 2022

Supercond. Sci. Technol.

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“…q = E • J, and the value is calculated by the electromagnetic module. The heat exchange between the HTS coil and the surrounding liquid nitrogen environment is realized by the heat-transfer boundary conditions, as shown in the following Equation (10) [5,20]:…”

Section: Model Descriptionmentioning

confidence: 99%

“…The coil will generate a large amount of loss when the fault current impacts, and the loss will cause the temperature of the tape to rise, thus causing the performance of the tape to decline or even tape damage [1][2][3]6,7]. In addition, under actual application conditions, the superconducting coil may be in a complex dynamic external field, and the superconducting magnet may also generate loss under the external field, thus affecting the thermal stability of the system [8][9][10][11]. Therefore, it is very important to study the electromagnetic and thermal properties of superconducting coils under complex oscillating external fields and fault currents.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the coil had good thermal stability [12]. In the case of external magnetic fields, Glowacki et al reported the influence of magnetic ripple fields on the coil loss and temperature of an AC motor [10]. Shen et al reported the effect of oscillating external magnetic fields on the AC loss and dynamic resistance of HTS tapes, but the temperature characteristics have not been studied [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Fault Current and Different Oscillating Magnetic Fields on Electromagnetic–Thermal Characteristics of the REBCO Coil

et al. 2022

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When the high-temperature superconducting (HTS) REBCO (rare-earth barium copper oxide) coil is applied in a power system, a large amount of heat may be generated due to the short-circuiting of the system, resulting in the thermal instability of the coil. Moreover, under complex working conditions, the oscillating external magnetic field will further aggravate the coil quench. In this paper, the electromagnetic–thermal coupling model is used to analyze the loss, current distribution and temperature distribution of the REBCO coil under short-circuit fault conditions and oscillating external magnetic fields. In order to get closer to the actual situation, the modeling of the superconducting tape adopts the real tape structure, and the resistivity of the superconductor is described by the modified E-J relationship. Four cases are considered for the oscillating external magnetic field, i.e., sine, triangle, sawtooth and square cases. This model has certain significance as a reference for understanding the thermal stability of coils in extreme cases.

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