Long-term operational experience with first siemens 400 kW HTS machine in diverse configurations

Frank, Michael P.; Frauenhofer, J.; Hasselt, Peter van; Nick, W.; Neumueller, H.-W.; Nerowski, G.

doi:10.1109/tasc.2003.813013

Cited by 78 publications

(37 citation statements)

References 2 publications

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“…However, since synchronous reactance of HTS generator in this design is 0.1 p.u, voltage regulation is a relatively low levels as 3.65% with resistance load. This value is a below level of that of 5% without excitation controls and does not pass PCS [7]. Therefore, it is concluded that the margin for improvement of voltage regulation remains.…”

Section: Electrical Characteristics Analysis Of a 10-mw-class Hts Synmentioning

confidence: 81%

3D electromagnetic design and electrical characteristics analysis of a 10-MW-class high-temperature superconducting synchronous generator for wind power

Kim¹,

Park²,

Le³

et al. 2014

Progress in Superconductivity and Cryogenics

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In this paper, the general electromagnetic design process of a 10-MW-class high-temperature superconducting (HTS) synchronous generator that is intended to be utilized for large scale offshore wind generator is discussed. This paper presents three-dimensional (3D) electromagnetic design proposal and electrical characteristic analysis results of a 10-MW-class HTS synchronous generator for wind power. For more detailed design by reducing the errors of a two-dimensional (2D) design owing to leakage flux in air-gap, we redesign and analyze the 2D conceptual electromagnetic design model of the HTS synchronous generator using 3D finite element analysis (FEA) software. Then electrical characteristics which include the no-load and full-load voltage of generator, harmonic contents of these two load conditions, voltage regulation and losses of generator are analyzed by commercial 3D FEA software.

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Section: Electrical Characteristics Analysis Of a 10-mw-class Hts Synmentioning

confidence: 81%

3D electromagnetic design and electrical characteristics analysis of a 10-MW-class high-temperature superconducting synchronous generator for wind power

Kim¹,

Park²,

Le³

et al. 2014

Progress in Superconductivity and Cryogenics

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“…The difference in the cost of these cooling systems can be consider marginal with respect to the overall cost of the system and it will be mainly related to the efficiency in the thermal insulation. A liquid neon based cooling system with additional thermosyphon has been recently used by Siemens in a prototype superconducting motor [7]. Today the liquid neon is very costly mainly due to its very limited market; but now there are signals that the cryogenic industry can substantially reduce its cost by introducing large liquefaction plants [8].…”

Section: Discussionmentioning

confidence: 99%

THE LEVITATION CHARACTERISTICS OF MGB[sub 2] PLATES ON TRACKS OF PERMANENT MAGNETS

Perini¹,

Bassani²,

Giunchi³

et al. 2010

AIP Conference Proceedings

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The bulk MgB 2 can be manufactured in large plates by an innovative process: the reactive liquid Mg infiltration (Mg-RLI). According to this process it is possible to produce, even at lab scale, plates of 10 ÷ 20 cm in lateral dimensions. The superconducting material resulting is very dense and, even if it is in polycrystalline form, it levitates with respect to Permanent Magnets (PM), like the textured YBCO samples, up to 35 K. In order to control the levitation forces and stiffnesses of an MgB 2 plate (10x10x1 cm 3 ) moving with respect to a track of PM's (NdFeB bars arranged in 4 lines according to an Halbach disposition and separated by Iron flux concentrators), we have used an instrumented Cryogenic Levitation Apparatus (CLA). We have studied different kind of movements of the PM's track with respect to the MgB 2 plate. First, we consider the vertical movement, assumed z direction, which describes the properly levitation characteristics. Secondly, we consider two kinds of lateral movements of the track, assumed x direction, with the long size of the magnets either perpendicular or parallel to the movement direction. The resulting configurations simulate the main movements that a superconducting levitating vehicle will do in a real track, either of axial or of guidance type. The levitation axial forces, measured in Field Cooling or Zero Field Cooling conditions, indicate that at the distance between superconducting plate and PM's of 4 mm it is possible to have an overall levitating pressure of 7 N/cm 2 .

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“…The first machine was 400kW, 1500rpm with HTS field windings made from 1G BSCCO coils, with a slotless armature winding [34]. The machine was operated at 25K, cooled by a GM cryocooler placed outside the machine, where liquid neon served as the cooling medium [35].…”

Section: Hts Machine Demonstratorsmentioning

confidence: 99%

Development of superconducting wind turbine generators

Jensen

Mijatović

Abrahamsen

2013

Journal of Renewable and Sustainable Energy

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In this paper the commercial activities in the field of superconducting machines, particularly superconducting wind turbine generators, are reviewed and presented. Superconducting generators have the potential to provide a compact and light weight drive train at high torques and slow rotational speeds, because high magnetic fields can be produced by coils with very little loss.Three different superconducting wind turbine generator topologies have been proposed by three different companies. One is based on low temperature superconductors (LTS); one is based on high temperature superconductors (HTS); and one is a fully superconducting generator based on MgB 2 . It is concluded that there is large commercial interest in superconducting machines, with an increasing patenting activity.Such generators are however not without their challenges. The superconductors have to be cooled down to somewhere between 4K and 50K, depending on what type of superconductor is employed, which poses a significant challenge both from a construction and operation point of view. The high temperature superconductors can facilitate a higher operation temperature and simplified cooling, but the current price and production volumes prohibit a large scale impact on the wind sector. The low temperature superconductors are readily available, but will need more sophisticated cooling.Eventually the CoE from superconducting wind turbines, with particular emphasis on reliability, will determine if they become feasible or not and for such investigations large-scale demonstrations will be needed.

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Long-term operational experience with first siemens 400 kW HTS machine in diverse configurations

Cited by 78 publications

References 2 publications

3D electromagnetic design and electrical characteristics analysis of a 10-MW-class high-temperature superconducting synchronous generator for wind power

3D electromagnetic design and electrical characteristics analysis of a 10-MW-class high-temperature superconducting synchronous generator for wind power

THE LEVITATION CHARACTERISTICS OF MGB[sub 2] PLATES ON TRACKS OF PERMANENT MAGNETS

Development of superconducting wind turbine generators

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