Computing AC losses in stacks of high-temperature superconducting tapes

Prigozhin, Leonid; Sokolovsky, Vladimir

doi:10.1088/0953-2048/24/7/075012

Cited by 86 publications

(106 citation statements)

References 24 publications

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“…But it does not permit to include effects linked to the fact that the other tapes are superconductor: the tapes in the middle of a stack should have lower AC losses than the tapes at the extremities [6]. For a 20-tape stack having small intertape distance, Prigozhin et al [9] showed that the AC transport current losses of the top/bottom tapes can be 15% higher than the ones in the middle of the stack. Therefore, we might overestimate the AC losses by neglecting the "stack effect."…”

Section: Resultsmentioning

confidence: 99%

“…Finally, another obstacle arises when considering multi-MW machines that require several thousand turns of superconducting tapes. Note that various promising mathematical methods have been proposed to calculate AC losses of a stack of tapes [8], [9], [18]. But as they introduce additional assumptions, it should be made clear whether they can be applied to an array of tapes.…”

Section: Introductionmentioning

confidence: 99%

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AC Losses of a Grid-Connected Superconducting Wind Turbine Generator

Quéval

Ohsaki

2013

IEEE Trans. Appl. Supercond.

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We present a numerical method to estimate the steady-state AC losses of a superconducting wind turbine generator connected to the grid through its AC/DC/AC converter. We use a multiscale simulation with unidirectional couplings between a lumped-parameter wind energy conversion system model, a finite element machine model, and a finite element HTS tape model. The estimation include effects linked to the generator space harmonics, the exciter control, and the AC/DC/AC converter PWM and control. As the superconducting coil is made of several thousand of HTS tapes, we evaluate AC losses for a fraction of them and we interpolate the results to the others. The steady-state AC losses of a 10 MW class generator are estimated to be under 60 W.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

AC Losses of a Grid-Connected Superconducting Wind Turbine Generator

Quéval

Ohsaki

2013

IEEE Trans. Appl. Supercond.

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“…Another characteristic feature of the magneto angular dependence of I c that can be seen in the modelling of 2G-HTS coils for high intensities of the applied current (i tr ≥ 0.8), is the occurrence of a concave distortion of the flux front profiles enclosing the magnetization current domains which cannot be observed with simplified Kim-like J c (B) models 16,24,35 .…”

Section: Geometry Considerations and Modelling Strategymentioning

confidence: 99%

Local electromagnetic properties and hysteresis losses in uniformly and non-uniformly wound superconducting racetrack coils

Robert

Fareed

2019

Journal of Applied Physics

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A noteworthy physical dependence of the hysteresis losses with the axial winding misalignment of superconducting racetrack coils made with commercial Second Generation High Temperature Superconducting (2G-HTS) tapes is reported. A comprehensive study on the influence of the turn-to-turn misalignment factor on the local electromagnetic properties of individual turns, is presented by considering six different coil arrangements and ten amplitudes for the applied alternating transport current, I a , together with an experimentally determined function for the magnetoangular anisotropy properties of the critical current density, J c (B, θ), across the superconducting tape. It has been found that for moderate to low applied currents I a ≤ 0.6 I c0 , with I c0 the self-field critical current of individual tapes, the resulting hysteretic losses under extreme winding deformations can lead to an increase in the energy losses of up to 25% the losses generated by a perfectly wound coil. High level meshing considerations have been applied in order to get a realistic account of the local and global electromagnetic properties of racetrack coils, including a mapping of the flux front dynamics with well defined zones for the occurrence of magnetization currents, transport currents, and flux-free cores, what simultaneously has enabled an adequate resolution for determining the experimental conditions when turn-to-turn misalignments of the order of 20 µm-100 µm in a 20 turns 4 mm wide racetrack coil can lead not only to the increment of the AC losses but also to its reduction.In this sense, we shown that for transport current amplitudes I a > 0.7 I c0 , a slight reduction in the hysteresis losses can be achieved as a consequence of the winding displacement which is at the same time connected with the size reduction of the flux free core at the coil central turns. Our findings can be used as a practical benchmark to determine the relative losses for any 2G-HTS racetrack coil application, unveiling the physical fingerprints that possible coil winding misalignments could infer.

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“…The computation time for the hysteresis losses in a finite stack of superconducting tapes can be reduced by representing the stack by a homogeneous bulk element, as is presented for an analytical model in [12]. An equivalent homogenization method is also applied in finite elements models based on the H-formulation of the magnetic field [13] to reduce the number of mesh elements.…”

Section: Introductionmentioning

confidence: 99%

Modeling and comparison of superconducting linear actuators for highly dynamic motion

Bruyn¹,

Jansen²,

Lomonova³

2015

Archives of Electrical Engineering

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This paper presents a numerical modeling method for AC losses in highly dynamic linear actuators with high temperature superconducting (HTS) tapes. The AC losses and generated force of two actuators, with different placement of the cryostats, are compared. In these actuators, the main loss component in the superconducting tapes are hysteresis losses, which result from both the non-sinusoidal phase currents and move ment of the permanent magnets. The modeling method, based on the H-formulation of the magnetic fields, takes into account permanent magnetization and movement of per manent magnets. Calculated losses as function of the peak phase current of both super conducting actuators are compared to those of an equivalent non-cryogenic actuator.

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Computing AC losses in stacks of high-temperature superconducting tapes

Cited by 86 publications

References 24 publications

AC Losses of a Grid-Connected Superconducting Wind Turbine Generator

AC Losses of a Grid-Connected Superconducting Wind Turbine Generator

Local electromagnetic properties and hysteresis losses in uniformly and non-uniformly wound superconducting racetrack coils

Modeling and comparison of superconducting linear actuators for highly dynamic motion

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