Development of a Superconducting Machine With Stacks of Second Generation HTS Tapes

Dias, Fernando Jorge Monteiro; Santos, Bárbara Maria Oliveira; Sotelo, Guilherme Gonçalves; Polasek, A.; Andrade, R. de

doi:10.1109/tasc.2019.2898252

Cited by 15 publications

(3 citation statements)

References 29 publications

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“…Electrical equipment made from high temperature superconductor (HTS) has the merits of compact structure, high energy density and low energy consumption level owing to the unique properties of HTS conductors. After decades of investigation and development, HTS devices [1], such as transmission cables [2], generators [3,4], motors [5][6][7], transformers [8] and ultra high-field research magnets [9][10][11] are close to maturity.…”

Section: Introductionmentioning

confidence: 99%

Coupling electromagnetic numerical models of HTS coils to electrical circuits: multi-scale and homogeneous methodologies using the T-A formulation

Zhou¹,

Santos²,

Ghabeli³

et al. 2022

Supercond. Sci. Technol.

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Numerical simulation is an effective tool for predicting the electromagnetic behavior of superconductors. Recently, a finite element method (FEM)-based model coupling the T-A formulation with an electrical circuit has been proposed: the model presents the superconducting constituent as a global voltage parameter in the electrical circuit. This allows assessing the overall behavior of complex high-temperature superconductor (HTS) systems involving multiple power items, while keeping a high degree of precision on the presentation of local effects. In this work, the applicability of this model has been extended to large-scale HTS applications with hundreds or thousands of tapes by referring to two widely recognized methodologies, multi-scale and homogenization, to improve the computation efficiency. Based on the two approaches, three different models were developed and their effectiveness was assessed using the case study of a 1000 turn cylindrical HTS coil charged by a DC voltage source. The comparison of the calculated global circuit parameters, local field distributions, losses, and computation time proves that the computation efficiency can be improved with respect to a model simulating all HTS tapes, without compromising accuracy. The results indicate that the developed models can therefore be efficient tools to design and optimize large-scale HTS devices used in electrical machines and power grids. Besides, it is found that the inductance of an HTS coil is varied according to the transport current and could even be higher than that of a normal conductor coil with the same geometry. We attribute this result to the superconductor's non-uniform current distribution and relaxation effect during the dynamic process.

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Section: Introductionmentioning

confidence: 99%

Coupling electromagnetic numerical models of HTS coils to electrical circuits: multi-scale and homogeneous methodologies using the T-A formulation

Zhou¹,

Santos²,

Ghabeli³

et al. 2022

Supercond. Sci. Technol.

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“…In this case, is the source for the A-V formulation and is the source for the 2D H formulation. constructed for the 2D (Brambilla et al, 2018;Dias et al, 2019;Santos, n.d.).…”

Section: Fig 3 Division Of Regions In the A-v-h Formulationmentioning

confidence: 99%

Simulation of a Superconductor Fault Current Limiter with finite element method using A-V-H formulation

Santos

Martins

Santos

et al. 2020

Anais Do Simpósio Brasileiro De Sistemas Elétricos 2020

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Nowadays, the complexity of electrical power systems is increasing. Consequently, the occurrence and the amplitude of the fault current are rising. This fault currents harm the substations’ electrical equipment. Besides, the growth in the fault current level is forcing the change of the circuit breakers to others with a higher interruption capability. A proposal to solve this problem is the fault current limiter (FCL). This equipment has low impedance in the normal operation and high impedance in a short circuit moment. Superconductors are an advantageous choice of material in this case, because of their properties. In order to simulate this equipment, the 2-D Finite Element Method (FEM) has been used. In this paper, a novel FEM simulation analysis of the saturated core Superconductor Fault Current Limiter (SFCL) is proposed using the A-V-H formulation. The current distribution in the superconducting coil is observed. The results are compared to the limited fault current measurements and simulations available in the literature.

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“…Electrical equipment using High-Temperature Superconducting (HTS) materials are reaching maturity after more than two decades of research and development. Nowadays, devices like Fault-Current Limiters (FCL) [1][2][3][4][5][6], power cables [7,8], and electric machines [9,10] have been built, and in some cases, installed in electric networks. The HTS materials with the most potential to address simultaneously cost and technical requirements are the second generation (2G) wire (or tape).…”

Section: Introductionmentioning

confidence: 99%

Essential Material Knowledge and Recent Model Developments for REBCO-Coated Conductors in Electric Power Systems

2021

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The manufacturing of commercial REBCO tapes, REBCO referring to Rare-earth barium copper oxide, has matured enough to lead to a variety of applications ranging from scientific instruments to electric power systems. In particular, its large current density with a high n index and low hysteresis losses make it a strong candidate for specific applications relying on the dependence of its resistance on current. Despite its advantages, there are still issues that remain to be addressed, such as the scarcity of experimental data for the basic characteristics of the superconductor over a wide range of temperature and applied magnetic field, the homogeneity of these characteristics along the conductor length, as well as the anisotropy of the critical current and n index with respect to the direction of the applied magnetic field. To better utilize the technology, it is therefore sensible to understand the relevancy of these issues so that one could simulate as accurately as possible the physics of the superconductor, at least the dynamics that may impact the correct operation of the superconducting device. There are different levels of modelling to achieve such a goal that can either focus on the performance of the superconductor itself, or on the whole device. The present work addresses some of the latest developments in the modelling of commercial REBCO tapes in power systems with a particular focus on the thermoelectric behavior of superconducting devices connected to external circuits. Two very different approaches corresponding to two different scales in the modelling of superconducting devices are presented: (1) analysis using equivalent models and lumped parameters to study the thermoelectric response of superconducting devices as a whole, (2) Finite Element Analysis (FEA) to compute distributed fields such as current density, magnetic flux density and local losses in tapes. In this context, this paper reviews both approaches and gives a broad variety of examples to show their practical applications in electric power systems. Firstly, they show the relevance of the technology in power systems engineering. Secondly, they allow inferring the necessary level of model details to optimize the operation of superconducting power devices in power grids. This level of details relies completely on the knowledge of some basic measurable properties of superconducting tapes (critical current and n index) and their cooling conditions.

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Development of a Superconducting Machine With Stacks of Second Generation HTS Tapes

Cited by 15 publications

References 29 publications

Coupling electromagnetic numerical models of HTS coils to electrical circuits: multi-scale and homogeneous methodologies using the T-A formulation

Coupling electromagnetic numerical models of HTS coils to electrical circuits: multi-scale and homogeneous methodologies using the T-A formulation

Simulation of a Superconductor Fault Current Limiter with finite element method using A-V-H formulation

Essential Material Knowledge and Recent Model Developments for REBCO-Coated Conductors in Electric Power Systems

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