Construction of a 100 kVA High Temperature Superconducting Synchronous Generator

Al-Mosawi, M.K.; Beduz, C.; Yang, Y.

doi:10.1109/tasc.2005.849607

Cited by 42 publications

(25 citation statements)

References 5 publications

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“…Thus, the estimated heat transfer through the TTE is ∼10 W which is comparable to the design from (105,118) where TTE was made from composite material (G10) and 60W of heat in total was estimated for 77 K. The table includes the heat transfer estimate for the top shaft. This is included because the cryostat is operated as open LN 2 bath and the HTS field winding had the shaft as a top TTE.…”

Section: Cryostatmentioning

confidence: 70%

“…Often applied configuration is cooling in a closed cycle of helium with one or several cryocoolers where a coolant which can be either a gas or a liquid (nitrogen, oxygen, neon, hydrogen) is circulated between heat exchanger (cold head) and HTS coils. Since gas or liquid is possible to be transferred via rotating coupling between stationary cold head and rotating HTS coils, where either a thermosiphon or forced circulation of fluid is employed, this configuration has particular benefits for HTS SM machines and is by far the most readily used (58,63,82,105). Instead of convection cooling, where fluid is the heat transport media, it is also possible to employ a conduction cooling where HTS coils are in a good thermal contact with heat exchanger (cold head) (106).…”

Section: Hts Machinesmentioning

confidence: 99%

“…An obvious advantage of composite materials is a rather low heat conduction with strength comparable to that of steel. The fiberglass G10 TTE in the design of the 100 kW (∼320 Nm of rated torque) air core machine developed in Southampton consist of multiple parts, eight 180 mm long "dog−bone−shaped" arms tapered by fiberglass bracing cone (105), where the total heat input (including current leads and heat transfer through the cryostat and TTE) was estimated to be 60 W (105, 118) at 77 K. A G-FRP (glass-fiber reinforced plastics) monolithic TTE was developed by CrossLink Faserverbundtechnik GmbH for Siemens for the 400 kW ship propulsion machine with ∼2500 Nm for rated torque and only 22 W of total cooling power requirements (119) at ∼30 K. An even more impressive accomplishment for the 400 kW machined design is the fact that the torque tube was able to sustain torques up to 37 kNm, which is ∼15 times higher than rated torque. This was required since the machine had very low synchronous reactance x d = 0.15 p.u.…”

Section: Torque Transfer Element (Tte)mentioning

confidence: 99%

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Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

192

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We have examined the potential of 10 MW superconducting direct drive generators to enter the European offshore wind power market and estimated that the production of about 1200 superconducting turbines until 2030 would correspond to 10% of the EU offshore market. The expected properties of future offshore turbines of 8 and 10 MW have been determined from an up-scaling of an existing 5 MW turbine and the necessary properties of the superconducting drive train are discussed. We have found that the absence of the gear box is the main benefit and the reduced weight and size is secondary. However, the main challenge of the superconducting direct drive technology is to prove that the reliability is superior to the alternative drive trains based on gearboxes or permanent magnets. A strategy of successive testing of superconducting direct drive trains in real wind turbines of 10 kW, 100 kW, 1 MW and 10 MW is suggested to secure the accumulation of reliability experience. Finally, the quantities of high temperature superconducting tape needed for a 10 kW and an extreme high field 10 MW generator are found to be 7.5 km and 1500 km, respectively. A more realistic estimate is 200–300 km of tape per 10 MW generator and it is concluded that the present production capacity of coated conductors must be increased by a factor of 36 by 2020, resulting in a ten times lower price of the tape in order to reach a realistic price level for the superconducting drive train.

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Section: Cryostatmentioning

confidence: 70%

Section: Hts Machinesmentioning

confidence: 99%

Section: Torque Transfer Element (Tte)mentioning

confidence: 99%

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Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

192

View full text Add to dashboard Cite

show abstract

“…The rotor core (Fig. 1) is formed from a stack of 9% Ni steel plates that are held together by 9% Ni steel bolts and dowels [6]. This was considered the best material as it has good magnetic characteristics and its thermal contraction is a reasonably good match to the coils and their stainless-steel formers, thus ensuring that they do not shrink onto the pole necks.…”

Section: Cored Rotor Designmentioning

confidence: 99%

Alternative Designs of High-Temperature Superconducting Synchronous Generators

Goddard

Lukasik²,

Sykulski

2009

IEEE Trans. Appl. Supercond.

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Abstract-This paper discusses the different possible designs of both cored and coreless superconducting synchronous generators using high-temperature superconducting (HTS) tapes, with particular reference to demonstrators built at the University of Southampton using BiSCCO conductors. An overview of the electromagnetic, thermal, and mechanical issues is provided, the advantages and drawbacks of particular designs are highlighted, the need for compromises is explained, and practical solutions are offered. The scalability of results obtained from small demonstrators is considered.

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“…1) made of 9% nickel steal, a material suitable for low temperatures and of high saturation flux density. The rotor is placed in a 0.9 mm thick copper tube which acts as a shield against higher order harmonics induced by the stator winding [1].…”

Section: Hts Coreless Rotor Designmentioning

confidence: 99%

Finite Element Assisted Method of Estimating Equivalent Circuit Parameters for a Superconducting Synchronous Generator With a Coreless Rotor

2009

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The paper outlines methods developed to obtain circuit parameters of a superconducting synchronous generator with a coreless rotor. The need for full three-dmensional (3D) finite element modeling is emphasized and appropriate techniques devised to estimate relevant equivalent characteristics. The methods described use steady-state ac models, predominantly in the rotor frame of reference; the use of transient or full rotating machine models is avoided.

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Construction of a 100 kVA High Temperature Superconducting Synchronous Generator

Cited by 42 publications

References 5 publications

Superconducting wind turbine generators

Superconducting wind turbine generators

Alternative Designs of High-Temperature Superconducting Synchronous Generators

Finite Element Assisted Method of Estimating Equivalent Circuit Parameters for a Superconducting Synchronous Generator With a Coreless Rotor

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