Development of a HTS Squirrel Cage Induction Motor With HTS Rotor Bars

Sim, Jae Kyeom; Lee, Kwangyoun; Cha, Guesso; Lee, Ji-Kwang

doi:10.1109/tasc.2004.830317

Cited by 26 publications

(13 citation statements)

References 4 publications

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“…Superconducting technology has been proposed for several machine types [21,22,23,24,25,26,27,28,29] however, most high power demonstrations of superconducting machines have been synchronous machines with superconducting field windings.…”

Section: Types Of Superconducting Machinesmentioning

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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Section: Types Of Superconducting Machinesmentioning

confidence: 99%

Development of superconducting wind turbine generators

Jensen

Mijatović

Abrahamsen

2013

Journal of Renewable and Sustainable Energy

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“…Therefore, if the induction machine is of squirrel-cage type, maximum torque may be shifted to the plugging zone by proper design of the deep bar dimensions [17]. Fig.…”

Section: B Using Deep Rotor Bar or Double-cage Rotor To Increase Elementioning

confidence: 99%

Improving Transient Stability of Grid-Connected Squirrel-Cage Induction Generators by Plugging Mode Operation

Zamani

Fathi

Riahy

et al. 2012

IEEE Trans. Energy Convers.

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The majority of the fixed-speed wind turbines are equipped with squirrel-cage induction generators (IG) and acconnected to the power system. During a fault in power system, voltage and rotor speed instability may occur, especially when the strength of the system compared to the power delivered by the IG is relatively low. This paper investigates a new method for improving the transient stability of power systems equipped with squirrel cage IGs. For stability improvement, the unique property of the induction machines which is the possibility of reversing the direction of the rotating flux is employed. In this method, after clearing the fault, operating mode of the induction machine is changed from the generating to the plugging mode for a short time. This leads to opposition between the rotating flux and mechanical torques, thus preventing the generator from further acceleration. Simulation results show that the proposed method can be effective in enhancing the transient stability. Since in this method, there is no need for accessory equipment, the proposed method is more attractive than the previous ones, from economic point of view.

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“…Induction machines with HTS conductors Induction machine designs published so far had only a HTS rotor squirrel cage (93,94). In this way, a torque characteristic of an induction machine would have a different trend compared to a conventional machine, due to the ac loss in HTS bars, which is a function of slip (higher the slip, larger the rotor resistance) (95).…”

Section: Hts Machinesmentioning

confidence: 99%

“…In this way, a torque characteristic of an induction machine would have a different trend compared to a conventional machine, due to the ac loss in HTS bars, which is a function of slip (higher the slip, larger the rotor resistance) (95). Consequently, start and maximum torque of induction machine will become much higher (93) and due to very stiff characteristic (very small slip) the energy loss in the rotor can be very small (96,97). However, the dominant ac nature of induction machines (even at slip frequencies for rotor currents) requires improved HTS conductor with respect to ac operation.…”

Section: Hts Machinesmentioning

confidence: 99%

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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Development of a HTS Squirrel Cage Induction Motor With HTS Rotor Bars

Cited by 26 publications

References 4 publications

Development of superconducting wind turbine generators

Development of superconducting wind turbine generators

Improving Transient Stability of Grid-Connected Squirrel-Cage Induction Generators by Plugging Mode Operation

Superconducting wind turbine generators

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