HTS Transformer–Rectifier Flux Pump Optimization

Gawith, James; Geng, Jianzhao; Ma, Jun; Shen, Boyang; Li, Chao; Coombs, Tim

doi:10.1109/tasc.2019.2904444

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…e magnetic field of the structure, and the constraints of the properties of the superconducting material must be considered, which will have important significance in the design of the electromagnetic parameters of the superconducting power device [12,13]. High-temperature superconducting tapes do not have the excellent mechanical properties of low-temperature superconducting wires.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

Zhi

Zhang

Yang

2022

Mobile Information Systems

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High-temperature superconducting transformers are an important research topic of superconducting technology in power applications, and electromagnetic field analysis and optimization are the basis for the design and application of high-temperature superconducting transformers. The electromagnetic field analysis of high-temperature superconducting transformers should consider the superconducting properties of the materials, that is, the properties of critical current and magnetic field. This paper aims to study the electromagnetic field analysis and optimization method of high-temperature superconducting transformer under the influence of abnormal voltage. Due to the energy loss of high-temperature superconducting transformers, in order to study the economy and reliability of high-temperature superconducting transformers, in this paper, the core loss, winding AC loss, and coil power consumption of high-temperature superconducting transformers are analyzed under normal operation and short-circuit fault conditions, respectively. The power and stress on the windings are analyzed. In order to take into account the current-carrying capacity, short-circuit loss, and short-circuit electromotive force of superconducting windings in normal operation, a concentrically placed double-cake coil structure is selected in this paper, and according to different optimization objectives, a global optimization method is used to evaluate the structure of the coil. The structural parameters of the high-temperature superconducting transformer are optimized, including the structural parameters of the magnetic conducting ring. It is found that that abnormal voltage will affect the electromagnetic field of high-temperature superconducting transformers, including winding circulating current, leakage magnetic field, and current distribution.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

Zhi

Zhang

Yang

2022

Mobile Information Systems

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“…The dynamic resistance theory can perfectly explain the mechanism of transformer-rectifier type flux pumps [76][77][78][79][80][81][82][83][84][85][86], which is due to the fact that the waveforms of the transport current and the applied field towards the HTS bridge are independently controlled. Dynamic resistance theory can also indirectly explain the behaviours of travelling-wave type flux pumps (e.g.…”

Section: Applications Using Dynamic Resistancementioning

confidence: 99%

Dynamic resistance and dynamic loss in a ReBCO superconductor

Zhang

Shen²,

Chen³

et al. 2022

Supercond. Sci. Technol.

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Dynamic resistance is a time-averaged direct current (DC) resistance in superconducting materials, which typically occurs when a superconductor is carrying a transport DC while simultaneously subject to a time-varying magnetic field. Dynamic resistance has recently attracted increasing attention as it not only causes detrimental dynamic loss in superconducting devices such as the Nuclear Magnetic Resonance (NMR) magnets and superconducting machines, but on the other hand, the generated dynamic voltage can be exploited in many applications, e.g., high temperature superconducting (HTS) flux pumps. This article reviews the physical mechanism as well as analytical, numerical modelling, and experimental approaches for quantifying dynamic resistance during the last few decades. Analytical formulae can be conveniently used to estimate the dynamic resistance/loss of a simple superconducting topology, e.g., a single rare-earth-barium-copper-oxide (ReBCO) tape. However, in a complex superconducting device such as a superconducting machine, the prediction of dynamic resistance/loss has to rely on versatile numerical modelling methods before carrying out experiments, especially at high frequencies up to the kHz level. The advantages, accuracies, drawbacks, and challenges of different quantification approaches for dynamic resistance/loss in various scenarios are all inclusively discussed. The application of dynamic resistance in HTS flux pumps is also presented. It is believed that this review can help enhance the understanding of dynamic resistance/loss in superconducting applications, and provide a useful reference for future superconducting energy conversion systems.

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“…Energies 2024, 17, 2684 2 of 12 A superconducting flux pump is a contactless DC power-supply device for superconducting magnets that compensates for current decay and ensures magnetic field stability by pumping flux into the closed-loop circuit of superconducting magnets [2]. Many types of HTS flux pump devices have been proposed in recent decades, including the heat actuated flux pump [8][9][10][11], the rotating magnets flux pump [12][13][14][15][16][17][18][19], the linear type flux pump [20][21][22][23], and the transformer rectifier flux pump [24][25][26][27], all of which can effectively achieve DC magnetization for HTS coils or bulks.…”

Section: Introductionmentioning

confidence: 99%

A Practical Superconducting DC Dynamo for Charging Conduction-Cooled HTS Magnet

Zhai,

Mu,

Wang

et al. 2024

Energies

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At present, HTS magnets cannot operate in the real closed-loop persistent current mode due to the existence of joint resistance, flux creep, and AC loss of the HTS tape. Instead of using a current source, HTS flux pumps are capable of injecting flux into closed HTS magnets without electrical contact. This paper presents a practical superconducting DC dynamo for charging a conduction-cooled HTS magnet system based on a flux-pumping technique. To minimize heat losses, the rotor is driven by a servo motor mounted outside the vacuum dewar by utilizing magnetic fluid dynamic sealing. Different parameters, such as air gap and rotating speed, have been tested to investigate the best pumping effect, and finally, it successfully powers a 27.3 mH HTS non-insulated double-pancake coil to the current of 54.2 A within 76 min. As a low-cost and compact substitute for the traditional current source, the realization of a contactless DC power supply can significantly improve the flexibility and mobility of the HTS magnet system and could be of great significance for the technological innovation of future HTS magnets used in offshore wind turbines, biomedical, aerospace, etc.

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HTS Transformer–Rectifier Flux Pump Optimization

Cited by 19 publications

References 15 publications

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

Dynamic resistance and dynamic loss in a ReBCO superconductor

A Practical Superconducting DC Dynamo for Charging Conduction-Cooled HTS Magnet

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