Performance Analysis of a 10-kW Superconducting Synchronous Generator

Kim, A-Rong; Kim, Kwangmin; Park, Heecheol; Kim, Gyeong-Hun; Park, Tae Joo; Park, Minwon; Kim, Seokho; Lee, Sang-Jin; Ha, Hong-Soo; Yoon, Sanghyun; Lee, Hunju

doi:10.1109/tasc.2014.2381000

Cited by 18 publications

(9 citation statements)

References 9 publications

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“…In recent years, advances in the development of high-temperature superconducting coils with rare-earth barium-copper oxide (REBCO)-coated conductors have drawn significant attention by the community of researchers in applied superconductivity, thanks to the vast progress in the technology of thin films that has enabled the fabrication of the second generation of high-temperature superconducting (2G-HTS) tapes in the past decade. Thence, the formulation of modelling tools for describing the electromagnetic and thermal properties of such 2G-HTS tapes and their use in high-power-density coils for applications such as superconducting fault current limiters [1,2,3], transformers [4,5], power generators [6,7,8], motors [9,10,11,12], energy storage systems [13,14,15], permanent magnets [16,17], and magnetic imaging machines [18,19] is currently a motivating force of intensive research due to the inherent complexity of the material law that governs the electrical properties of the superconducting compound, the computational challenges that are imposed by the large cross-sectional aspect ratio of the 2G-HTS tape, and ultimately, the actual size of the coils that need to be modelled before investing in usually large and customised cryogenic facilities for their experimental testing.…”

Section: Introductionmentioning

confidence: 99%

How to Choose the Superconducting Material Law for the Modelling of 2G-HTS Coils

Robert

Fareed

2019

Materials

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In an attempt to unveil the impact of the material law selection on the numerical modelling and analysis of the electromagnetic properties of superconducting coils, in this paper we compare the four most common approaches to the E-J power laws that serve as a modelling tool for the conductivity properties of the second generation of high-temperature superconducting (2G-HTS) tapes. The material laws considered are: (i) the celebrated E-J critical-state like-model, with constant critical current density and no dependence with the magnetic field; (ii) the classical Kim’s model which introduces an isotropic dependence with the environment magnetic field; (iii) a semi-empirical Kim-like model with an orthonormal field dependence, J c ( B ) , widely used for the modelling of HTS thin films; and (iv) the experimentally measured E–J material law for SuperPower Inc. 2G-HTS tapes, which account for the magneto-angular anisotropy of the in-field critical current density J c ( B ; θ ) , with a derived function similar to Kim’s model but taking into account some microstructural parameters, such as the electron mass anisotropy ratio ( γ ) of the superconducting layer. Particular attention has been given to those physical quantities which within a macroscopic approach can be measured by well-established experimental setups, such as the measurement of the critical current density for each of the turns of the superconducting coil, the resulting distribution of magnetic field, and the curve of hysteretic losses for different amplitudes of an applied alternating transport current at self-field conditions. We demonstrate that although all these superconducting material laws are equally valid from a purely qualitative perspective, the critical state-like model is incapable of predicting the local variation of the critical current density across each of the turns of the superconducting coil, or its non-homogeneous distribution along the width of the superconducting tape. However, depending on the physical quantity of interest and the error tolerance allowed between the numerical predictions and the experimental measurements, in this paper decision criteria are established for different regimes of the applied current, where the suitability of one or another model could be ensured, regardless of whether the actual magneto angular anisotropy properties of the superconducting tape are known.

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Section: Introductionmentioning

confidence: 99%

How to Choose the Superconducting Material Law for the Modelling of 2G-HTS Coils

Robert

Fareed

2019

Materials

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“…electrical stability compared to conventional machines [6][7][8]. International manufacturers who are actively developing superconducting machines include: Doosan HE [9] (wind and ship); Guina R&D [10]; Kawasaki HI [11,12] (ship); Oswald [13] (motor); POSCO [14] (wind); Teco-Westinghouse [15] (wind) and Siemens [16] (utilities generator).…”

Section: Introductionmentioning

confidence: 99%

Development of a brushless HTS exciter for a 10 kW HTS synchronous generator

Bumby

Badcock

Sung

et al. 2016

Supercond. Sci. Technol.

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108

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HTS synchronous generators, in which the rotor coils are wound from high-T c superconducting wire, are exciting attention due to their potential to deliver very high torque and power densities. However, injection of the large DC currents required by the HTS rotor coils presents a technical challenge. In this paper we discuss the development of a brushless HTS exciter which operates across the cryostat wall to inject a superconducting DC current into the rotor coil circuit. This approach fundamentally alters the thermal load upon the cryogenic system by removing the need for thermally inefficient normal-conducting current leads. We report results from an experimental laboratory device and show that it operates as a constant voltage source with an effective internal resistance. We then discuss the design of a prototype HTS-PM exciter based on our experimental device, and describe its integration with a demonstration HTS generator. This 200 RPM, 10 kW synchronous generator comprises eight double pancake HTS rotor coils which are operated at 30 K, and are energised to 1.5 T field through the injection of 85 A per pole. We show how this excitation can be achieved using an HTS-PM exciter consisting of 12 stator poles of 12 mm YBCO coated-conductor wire and an external permanent magnet rotor. We demonstrate that such an exciter can excite the rotor windings of this generator without forming a thermal-bridge across the cryostat wall. Finally, we provide estimates of the thermal load imposed by our prototype HTS-PM exciter on the rotor cryostat. We show that duty cycle operation of the device ensures that this heat load can be minimised, and that it is substantially lower than that of equivalently-rated conventional current leads.

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“…Otherwise, liquid neon (LNe) is an attractive refrigerant in bath cooling for rotating machines operating at liquid neon temperature (27 K) [6,7] because its latent heat of vaporization per volume is 40 times higher than liquid helium. It also has been successfully applied in a recent study [8]. Fig.…”

Section: Configuration Of Cryogenic Cooling Systemmentioning

confidence: 99%

A compactly integrated cooling system of a combination dual 1.5-MW HTS motors for electric propulsion

Le¹,

Kim²,

Hyeon³

et al. 2016

Progress in Superconductivity and Cryogenics

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The high temperature superconducting (HTS) contra-rotating propulsion (CRP) systems comprise two coaxial propellers sited on behind the other and rotate in opposite directions. They have the hydrodynamic advantage of recovering the slipstream rotational energy which would otherwise be lost to a conventional single-screw system. However, the cooling systems used for HTS CRP system need a high cooling power enough to maintain a low temperature of 2G HTS material operating at liquid neon (LNe) temperature (24.5 -27 K). In this paper, a single thermo-syphon cooling approach using a Gifford-McMahon (G-M) cryo-cooler is presented. First, an optimal thermal design of a 1.5 MW HTS motor was conducted varying to different types of commercial 2G HTS tapes. Then, a mono-cryogenic cooling system for an integration of two 1.5 MW HTS motors will be designed and analyzed. Finally, the 3D finite element analysis (FEA) simulation of thermal characteristics was also performed.

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Performance Analysis of a 10-kW Superconducting Synchronous Generator

Cited by 18 publications

References 9 publications

How to Choose the Superconducting Material Law for the Modelling of 2G-HTS Coils

How to Choose the Superconducting Material Law for the Modelling of 2G-HTS Coils

Development of a brushless HTS exciter for a 10 kW HTS synchronous generator

A compactly integrated cooling system of a combination dual 1.5-MW HTS motors for electric propulsion

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