Design and in-field testing of the world’s first ReBCO rotor for a 3.6 MW wind generator

Bergen, Anne; Andersen, Rasmus S.; Bauer, Markus; Boy, Hermann; Brake, Marcel ter; Brutsaert, Patrick; Bührer, Carsten; Dhallé, M.; Hansen, Jesper; Kate, H. Ten; Kellers, J.; Krause, Jens; Krooshoop, Erik; Kruse, Christian; Kylling, Hans; Pilas, Martin; Pütz, Hendrik; Rebsdorf, Anders V.; Reckhard, Michael; Seitz, Eric; Springer, H.; Song, Xiaowei; Tzabar, N.; Wessel, S.; Wiezoreck, J.; Winkler, Tiemo; Yagotyntsev, Konstantin

doi:10.1088/1361-6668/ab48d6

Cited by 92 publications

(51 citation statements)

References 29 publications

(34 reference statements)

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“…The high trapped flux in superconducting stacks can be exploited to enhance the magnetic flux density at the gap of motors and generators, when placing these materials in the rotor [6][7][8]. Other alternatives to achieve the same goal by means of superconductors is to use bulks [9][10][11][12] or pole coils in the rotor [13,14]. Higher gap flux densities enable weigh and size reduction for the same power and torque ratings.…”

Section: Introductionmentioning

confidence: 99%

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Kapolka¹,

Pardo

Grilli³

et al. 2019

Supercond. Sci. Technol.

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Stacks of superconducting tapes can trap much higher magnetic fields than conventional magnets. This makes them very promising for motors and generators.However, ripple magnetic fields in these machines present a cross-field component that demagnetizes the stacks. At present, there is no quantitative agreement between measurements and modeling of cross-field demagnetization, mainly due to the need of a 3D model that takes the end effects and real micron-thick superconducting layer into account. This article presents 3D modeling and measurements of cross-field demagnetization in stacks of up to 5 tapes and initial magnetization modeling of stacks of up to 15 tapes. 3D modeling of the cross-field demagnetization explicitly shows that the critical current density, J c , in the direction perpendicular to the tape surface does not play a role in cross-field demagnetization. When taking the measured anisotropic magnetic field dependence of J c into account, 3D calculations agree with measurements with less than 4 % deviation, while the error of 2D modeling is much higher. Then, our 3D numerical methods can realistically predict cross-field demaga This article has been published in Supercond. Sci. Technol. with netization. Due to the force-free configuration of part of the current density, J, in the stack, better agreement with experiments will probably require measuring the J c anisotropy for the whole solid angle range, including J parallel to the magnetic field.the probe is at least 10 mV/T. Cross-field demagnetization consists on the following three main steps: magnetization by field cooling (FC) method, relaxation time and cross-field demagnetization. The detailed process is the following:• The sample is placed into the electromagnet at room temperature.• The electromagnet is ramped up to 1 T.• The sample is cooled down in liquid nitrogen bath at 77 K.• The electromagnet is ramped down with ramp rate 10 mT/s. 400 405 410 415 420 425 B t /B 0 [-] t [s] cal 50 mT cal 100 mT cal 150 mT cal 50 mT n(B,θ) cal 100 mT n(B,θ) cal 150 mT n(B,θ) (b) FIG. 19: (a) The n(B, θ) measured data on a 4 mm wide SuperOx tape, measured in Bratislava by the set-up in [46]. (b) The comparison of calculation with constant n=30 and n(B, θ) dependence, both cases use J c (B, θ) dependence. Using n(B, θ) slightly reduces the demagnetization rate for a few number of cycles, but later on it is increased slightly.

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Section: Introductionmentioning

confidence: 99%

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Kapolka¹,

Pardo

Grilli³

et al. 2019

Supercond. Sci. Technol.

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“…each coil has its own cryostat in the same racetrack shape as shown in Fig. 1a [5], [25]. The three-phase winding arrangement under five poles is: C+c-c-C+a-A+A+a-B+b-b-B+.…”

Section: A Armature Windingmentioning

confidence: 99%

Short-Circuit Characteristics of Superconducting Permanent Magnet Generators for 10 MW Wind Turbines

Liu

Song

Wang

et al. 2021

IEEE Trans. Appl. Supercond.

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Superconducting permanent magnet generators (SCPMGs) are a potential candidate for 10 MW direct-drive wind turbine applications. This paper presents two 10 MW SCPMG designs using MgB2 cables for the armature winding and investigates the short-circuit characteristics of the designed SCPMGs. The first part of the results shows that the SCPMGs can double the shear stress of a conventional low-speed permanent magnet (PM) generator (from 65 kPa to 130 kPa) whilst avoiding demagnetization of the PMs in rated-load operation. However, the power factor has to drop to a range of 0.7-0.8. The second part of the results shows that during a sudden threephase short circuit, the superconducting armature winding is prone to quench and the PMs are likely to be demagnetized in both proposed designs.

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“…Thus, they are being considered in 10+ MW offshore direct-drive (DD) wind turbines to reduce the levelized cost of energy (LCOE) [1]- [6]. The state of the art of HTS generators for wind turbines is that within the EcoSwing project a full-scale 3 MW-class DD HTS generator has been successfully commissioned on a real wind turbine [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation Into Multi-Phase Armature Windings for High-Temperature Superconducting Wind Turbine Generators

Liu

Song

Deng

et al. 2020

IEEE Trans. Appl. Supercond.

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High-temperature superconducting (HTS) generators are being considered as a competitive candidate in large direct-drive (DD) wind turbines because of their features of being lightweight and compact. Normally a large air gap is inevitable in partially HTS generators, sacrificing the torque producing capability. In this paper, multi-phase armature windings for HTS generators are investigated to reduce the air gap length in HTS generators while not compromising generators' performance. Therefore, the torque density of HTS generators can be improved without any added costs. Five different multi-phase armature winding schemes are studied in the paper. Their performance regarding torque production and rotor losses in a 10 MW DD HTS generator are examined. The findings show that employing multi-phase armature windings can reduce the mechanical air gap without generating extra eddy current losses in the rotor, and the torque production can be improved by up to 9.1%. In addition, the alternating magnetic field reaching the HTS field winding are also reduced by using multi-phase armature windings, resulting in lower AC losses and cooling costs.

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Design and in-field testing of the world’s first ReBCO rotor for a 3.6 MW wind generator

Cited by 92 publications

References 29 publications

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Short-Circuit Characteristics of Superconducting Permanent Magnet Generators for 10 MW Wind Turbines

Investigation Into Multi-Phase Armature Windings for High-Temperature Superconducting Wind Turbine Generators

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