Numerical and Experimental Analysis of AC Loss of YBCO Coated Conductor Carrying DC and AC Offset Transport Current

Li, Ying; Xu, Jian; Sheng, Jie; Lin, Binghui; Jin, Zhijian; Hong, Zhiyong; Li, Zhuyong

doi:10.1109/tasc.2013.2245373

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…There are a few successful studies of numerical loss calculation using H-formulation for HTS under complex AC and DC conditions, e.g. numerical analysis of AC loss in YBCO coated conductor tapes carrying DC and AC offset transport current [15], and ripple field losses in direct current biased superconducting tapes [16]. Therefore, a powerful and do-it-all numerical model using H-formulation for the HTS coil is necessary to be established, which could efficiently calculate the AC loss from Scenario 2 and 3, and other complex conditions.…”

Section: Introductionmentioning

confidence: 99%

Power dissipation in HTS coated conductor coils under the simultaneous action of AC and DC currents and fields

Shen

Geng

et al. 2018

Supercond. Sci. Technol.

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This paper presents a comprehensive AC loss study of a circular HTS coil. The AC losses from a circular double pancake coil were measured using the electrical method. A 2D axisymmetric H-formulation model using FEM package COMSOL Multiphysics has been established, which was able to make consistency with the real circular coil used in the experiment. To model a circular HTS coil, a 2D axisymmetric model provided better accuracy than a general 2D model, and was also more efficient than a 3D model. Three scenarios have been analysed: Scenario 1 AC transport current and DC magnetic field (experiment and simulation); Scenario 2 DC transport current and AC magnetic field (simulation); Scenario 3 AC transport current and AC magnetic field (simulation and experimental data support). The angular dependence analysis on the coil under the magnetic field with the different orientation angle  has been carried out for all three scenarios. For Scenario 3, we investigated the effect of relative phase difference ∆ between AC current and AC field on the total AC loss of the coil. To summarise, we have carried out a current/field/angle/phase dependent AC loss (I, B, , ∆) study of circular HTS coil, which could potentially benefit the future design and research of HTS AC systems.

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Section: Introductionmentioning

confidence: 99%

Power dissipation in HTS coated conductor coils under the simultaneous action of AC and DC currents and fields

Shen

Geng

et al. 2018

Supercond. Sci. Technol.

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“…ac losses are solved by using partial differential equation modes in a commercial software, COMSOL Multiphysics. A similar method has been used in our previous work [5], [9]. The dependence of the wire's critical current on the external perpendicular magnetic field is taken into consideration, as shown in Fig.…”

Section: Experiments and Numerical Modelmentioning

confidence: 99%

“…However, only ac transport current is considered in almost all of these studies. In addition, references [6]- [9] researched ac losses of a single wire under an ac ripple current and dc offset current. In general, there are few experiments or numerical models that research ac losses of HTS pentagonal conductors carrying dc offset transport current.…”

Section: Introductionmentioning

confidence: 99%

A Study on AC Losses of HTS Pentagonal Conductors Consisting of 2G Wires Carrying DC Offset Transport Current

Yao

et al. 2015

IEEE Trans. Appl. Supercond.

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In a high-voltage dc (HVDC) transmission system, a high-temperature superconducting (HTS) dc cable is a feasible candidate due to its high power density. However, the dc in the grid includes ac ripple generated from switching devices and the environment, which can cause ac losses. In this paper, two pentagonal conductors consisting of second-generation (2G) wires are prepared, and their ac losses are investigated under the application of current with ac and dc components. Moreover, a numerical analysis is performed for both conductors to compare the measured losses. The results show that the measured ac losses correspond well with the numerical ones calculated by our models. The dc offset current does not affect the ac losses when the total current is smaller than the critical current, and the ac losses depend on the amplitude of the ac component. All measured losses are verified by evaluating the dependence on the arrangement of the voltage leads, the contact position, and the frequency.Index Terms-AC loss, DC offset current, finite element method, pentagonal multi-wire conductor.

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“…Although DC current is always applied to the magnets and accelerators, AC ripple currents exist simultaneously with DC current during the transient processes of excitations and deexcitations, thus incurring AC Losses in the HTS tapes. AC loss is an important factor for HTS electric equipment in that it determines the capacity of the accompanying cryogenic cooling system [3]. References [3][4][5][6][7] have experimentally researched the AC loss behavior of superconducting tapes under AC ripple superimposed on a DC offset current, providing useful guidance for the evaluation of AC losses when the DC and AC ripple currents exist simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…AC loss is an important factor for HTS electric equipment in that it determines the capacity of the accompanying cryogenic cooling system [3]. References [3][4][5][6][7] have experimentally researched the AC loss behavior of superconducting tapes under AC ripple superimposed on a DC offset current, providing useful guidance for the evaluation of AC losses when the DC and AC ripple currents exist simultaneously. References [8][9][10][11][12][13] provide some measuring methods of AC losses, but the applied frequencies of AC ripple currents are not typical in actual power systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Simulation Research of AC Ripple Losses in a High Temperature Superconductor Tape

Liu

Song

Zhang

et al. 2018

Advances in Condensed Matter Physics

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Current leads in superconducting magnets are widely adopted for heavy current transmission, and HTS DC cables have great advantages when used as current leads for such purposes. However, as an important parameter of HTS DC cables, AC loss has a strong impact on the stability and operation cost of current leads. In this paper, experiments were conducted to measure AC ripple losses of HTS tapes and HTS cables, and simulations of HTS tapes were carried out. The paper has reached conclusions on the relation between AC losses and power frequencies.

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Numerical and Experimental Analysis of AC Loss of YBCO Coated Conductor Carrying DC and AC Offset Transport Current

Cited by 12 publications

References 11 publications

Power dissipation in HTS coated conductor coils under the simultaneous action of AC and DC currents and fields

Power dissipation in HTS coated conductor coils under the simultaneous action of AC and DC currents and fields

A Study on AC Losses of HTS Pentagonal Conductors Consisting of 2G Wires Carrying DC Offset Transport Current

Experimental and Simulation Research of AC Ripple Losses in a High Temperature Superconductor Tape

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