Development of design for large scale conductors and coils using MgB2 for superconducting magnetic energy storage device

Yagai, Tsuyoshi; Mizuno, S.; Okubo, Toru; Mizuochi, Sora; Kamibayashi, Masahiro; Jimbo, Mana; Takao, T.; Hirano, Naoki; Makida, Y.; Shintomi, T.; Komagome, Toshihiro; Tsukada, K.; Onji, Taiki; Arai, Yuki; Ishihara, Atsushi; Tomita, Masaru; Miyagi, Daisuke; Tsuda, Makoto; Hamajima, T.

doi:10.1016/j.cryogenics.2018.10.006

Cited by 30 publications

(19 citation statements)

References 14 publications

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“…The SMES system used in this study consists of three stacked double-pancake coils connected in series. We previously fabricated three types of MgB2 test coils to establish the manufacturing method [2], and these coils, referred to as DP-1, DP-2 and DP-3, were used in the present study. The inner and outer diameters of the coils are identical, but the thickness and number of turns are different.…”

Section: Mgb2 Conductors and Coilsmentioning

confidence: 99%

Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB₂ with liquid hydrogen indirect cooling

Ryo

Onji

Yagai

et al. 2023

J. Phys.: Conf. Ser.

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We have demonstrated an advanced superconducting power conditioning system, in which a superconducting magnetic energy storage (SMES) device, a generator based on a fuel cell (FC), and an electrolyzer are used to compensate for electricity fluctuations over a wide frequency range, combined with a liquid hydrogen storage system to both cool the SMES and provide pure hydrogen gas to the FC and other gas-dependent systems. To manufacture the coils for the SMES, we used MgB2, whose critical temperature is below the boiling temperature of hydrogen. We developed a 10 kJ SMES coil system indirectly cooled by liquid hydrogen using thermosyphon passive heat exchange to isolate the flammable hydrogen from the electrical components. We performed a successful demonstration of this system for both DC and AC currents ramped at different rates. In the present study, we use computer simulations involving heat balance equations to evaluate the stability of the system. The results obtained are expected to lead to the design of future large-capacity energy storage systems, such as the MJ class, which offer comparable performance to conventional NbTi SMES devices.

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Section: Mgb2 Conductors and Coilsmentioning

confidence: 99%

Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB₂ with liquid hydrogen indirect cooling

Ryo

Onji

Yagai

et al. 2023

J. Phys.: Conf. Ser.

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“…The data presented in this study are openly available in [20,21,[33][34][35][36][37][38][39][40][41][42][43][44]83].…”

Section: Data Availability Statementmentioning

confidence: 99%

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

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Superconductor technology has recently attracted increasing attention in power-generation- and electrical-propulsion-related domains, as it provides a solution to the limited power density seen by the core component, electrical machines. Superconducting machines, characterized by both high power density and high efficiency, can effectively reduce the size and mass compared to conventional machine designs. This opens the way to large-scale purely electrical applications, e.g., all-electrical aircrafts. The alternating current (AC) loss of superconductors caused by time-varying transport currents or magnetic fields (or both) has impaired the efficiency and reliability of superconducting machines, bringing severe challenges to the cryogenic systems, too. Although much research has been conducted in terms of the qualitative and quantitative analysis of AC loss and its reduction methods, AC loss remains a crucial problem for the design of highly efficient superconducting machines, especially for those operating at high speeds for future aviation. Given that a critical review on the research advancement regarding the AC loss of superconductors has not been reported during the last dozen years, especially combined with electrical machines, this paper aims to clarify its research status and provide a useful reference for researchers working on superconducting machines. The adopted superconducting materials, analytical formulae, modelling methods, measurement approaches, as well as reduction techniques for AC loss of low-temperature superconductors (LTSs) and high-temperature superconductors (HTSs) in both low- and high-frequency fields have been systematically analyzed and summarized. Based on the authors’ previous research on the AC loss characteristics of HTS coated conductors (CCs), stacks, and coils at high frequencies, the challenges for the existing AC loss quantification methods have been elucidated, and multiple suggestions with respect to the AC loss reduction in superconducting machines have been put forward. This article systematically reviews the qualitative and quantitative analysis methods of AC loss as well as its reduction techniques in superconductors applied to electrical machines for the first time. It is believed to help deepen the understanding of AC loss and deliver a helpful guideline for the future development of superconducting machines and applied superconductivity.

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“…This is because MgB 2 can maintain a superconducting state at a temperature range of 10-20 K without expensive liquid helium and has a relatively simple crystal structure, large coherence length, weak anisotropy, low production cost, and low weight [1][2][3][4]. For the largescale biomedical and electric power applications, superconductors in a long wire or tape type were generally used [5][6][7][8][9][10]. When making MgB 2 wires or tapes, the powder type of the raw material is generally used because of the inferior formability of the synthesized bulk MgB 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Fig 7. Comparison of the average packing density predicted and measured in the wire-drawing processes.…”

mentioning

confidence: 98%

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

Lee

Chung

et al. 2021

Met. Mater. Int.

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Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawing processes for multi-filamentary MgB 2 wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface using the new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effect of the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxial compression tests were conducted using different powder densities to characterize the modified DPC model. A commercial finite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB 2 wire. The density and area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The difference in packing density at the inner and outer filaments of the MgB 2 wire was successfully captured by simulation. In addition, the effect of the initial packing density on the superconducting properties of MgB 2 wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be more effective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB 2 wire when the final packing density is saturated after a number of drawing processes.

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Development of design for large scale conductors and coils using MgB2 for superconducting magnetic energy storage device

Cited by 30 publications

References 14 publications

Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB₂ with liquid hydrogen indirect cooling

Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB₂ with liquid hydrogen indirect cooling

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

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Development of design for large scale conductors and coils using MgB2 for superconducting magnetic energy storage device

Cited by 30 publications

References 14 publications

Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB2 with liquid hydrogen indirect cooling

Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB2 with liquid hydrogen indirect cooling

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

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Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB₂ with liquid hydrogen indirect cooling

Demonstration and thermal equilibrium analysis of a 10 kJ capacity energy storage coil made of MgB₂ with liquid hydrogen indirect cooling