Study of Practical Applications of HTS Synchronous Machines

Maki, Naoki; Takao, T.; Fuchino, S.; Hiwasa, H.; Hirakawa, M.; Okumura, K.; Asada, M.; Takahashi, R.

doi:10.1109/tasc.2005.849603

Cited by 34 publications

(16 citation statements)

References 2 publications

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“…In the case of the SCSG being connected to a frequency converter, which provides a variable stator frequency according to the actual rotor speed, no relative movement between the stator and rotor field exists. The copper stator winding has double-layered and distributed three-phase winding [7][8][9][10].…”

Section: Fig 3 Schematic Diagram Of the Gearless Type Scsgmentioning

confidence: 99%

Optimal Design of a MW Class SCSG for a Tidal Current Power Generation System

Go¹,

Sung²,

Park³

et al. 2015

Journal of Electrical Engineering and Technology

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-A superconducting synchronous generator (SCSG) can be expected to decrease the size and weight compared to conventional tidal current generators. This paper proposes an optimal design of a 2 MW class SCSG for a tidal current power generation system. The proposed optimal design of the SCSG will reduce the length of the high-temperature superconducting wire as well as the weight and volume of the SCSG. The 3D finite element method is used to analyze the magnetic field distribution. The optimized 2 MW SCSG is compared with a 2 MW conventional generator. As the optimized SCSG is more compact and lighter than a conventional generator, it will be efficiently applied to practical tidal power systems.

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Section: Fig 3 Schematic Diagram Of the Gearless Type Scsgmentioning

confidence: 99%

Optimal Design of a MW Class SCSG for a Tidal Current Power Generation System

Go¹,

Sung²,

Park³

et al. 2015

Journal of Electrical Engineering and Technology

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“…There was a significant study of the components reliability, done by the ATP, using a mean time before failure system (MTBF), which revealed that the HTS rotor of Sea Titan with its HTS and cryogenic and vacuum system will have a lifetime of over 30 years without maintenance. The rotor stress occurs when it is thermally cycled; this reliability plan allocates a thermal cycle per year for which there is no need in practice [25,26] [51][52][53]. It consists of a method to design large HTS generators for wind power systems.…”

Section: Specifications Advantages Disadvantagesmentioning

confidence: 99%

“…An analysis of different wind HTSSG based on different variables of interest for electrical machines design as pole number, outer diameter and synchronous reactance had been done. This work focused on a range of power from 2 to 8 MW and a range of speed 21.5-12 rpm [52]. The analysis reveals that increasing the number of poles, the HTS length needed and the total weight of the generator are reduced but not the HTSSG overall efficiency [52].…”

Section: Specifications Advantages Disadvantagesmentioning

confidence: 99%

“…This work focused on a range of power from 2 to 8 MW and a range of speed 21.5-12 rpm [52]. The analysis reveals that increasing the number of poles, the HTS length needed and the total weight of the generator are reduced but not the HTSSG overall efficiency [52]. Moreover, the tendency of increasing the generator weight as the synchronous reactance of the generator increases is explained.…”

Section: Specifications Advantages Disadvantagesmentioning

confidence: 99%

“…HTS electrical machines with non-ferromagnetic rotor poles and with and air gap winding [52], 2. HTS electrical machines with magnetic poles (Ni alloy) and a conventional stator [52], 3. HTS electrical machines with conventional rotor and stator [52].…”

Section: Specifications Advantages Disadvantagesmentioning

confidence: 99%

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A review of high temperature superconductors for offshore wind power synchronous generators

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Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

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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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Study of Practical Applications of HTS Synchronous Machines

Cited by 34 publications

References 2 publications

Optimal Design of a MW Class SCSG for a Tidal Current Power Generation System

Optimal Design of a MW Class SCSG for a Tidal Current Power Generation System

A review of high temperature superconductors for offshore wind power synchronous generators

Superconducting wind turbine generators

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