Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines

Dong Liu, Henk Polinder, Asger Bech Abrahamsen, Jan A. Ferreira

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

To reduce the cost of energy of offshore wind energy conversion, large individual wind turbines of 10 MW or higher power levels are drawing more attention and expected to be desirable. Conventional wind generator systems would be rather large and costly if scaled up to 10 MW. Direct drive superconducting generators have been proposed to reduce the generator size, because the electrical machines with superconducting windings are capable of achieving a higher torque density. However, a superconducting machine is likely to produce an excessive torque during a short circuit because of its small reactance. An electromagnetic (EM) shield between the rotor and the stator as well as iron or non-magnetic composite (NMC) armature teeth affects the sub-transient reactance of a superconducting machine so that they play a role in the short-circuit performance of a superconducting wind generator. This paper presents a 10 MW superconducting generator design and studies the effects of material, thickness and position of an EM shield and the effects of NMC and iron armature teeth on the torque and the field current density during a three-phase short circuit at the generator terminal. One result shows that the short circuit torque is not able to be effectively reduced by varying the EM shield and the armature tooth material. The other result shows that the field current density is likely to exceed its critical value during a short circuit although the EM shield material and the armature tooth material take some effect.
Original languageEnglish
Title of host publicationProceedings of 2015 IEEE International Electric Machines & Drives Conference (IEMDC)
PublisherIEEE
Publication date2015
Pages709 - 714
DOIs
Publication statusPublished - 2015
EventIEEE International Electric Machines & Drives Conference 2015 - Coeur d'Alene, ID, United States
Duration: 10 May 201513 May 2015

Conference

ConferenceIEEE International Electric Machines & Drives Conference 2015
CountryUnited States
CityCoeur d'Alene, ID
Period10/05/201513/05/2015

Keywords

  • Direct drive
  • Electromagnetic shield
  • Field current
  • Finite element method
  • Magnesium diboride
  • Short circuit
  • Superconducting generator
  • Torque
  • Wind turbine

Cite this

Liu, D., Polinder, H., Abrahamsen, A. B., & Ferreira, J. A. (2015). Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines. In Proceedings of 2015 IEEE International Electric Machines & Drives Conference (IEMDC) (pp. 709 - 714). IEEE. https://doi.org/10.1109/IEMDC.2015.7409137
Liu, Dong ; Polinder, Henk ; Abrahamsen, Asger Bech ; Ferreira, Jan A. / Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines. Proceedings of 2015 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2015. pp. 709 - 714
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title = "Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines",
abstract = "To reduce the cost of energy of offshore wind energy conversion, large individual wind turbines of 10 MW or higher power levels are drawing more attention and expected to be desirable. Conventional wind generator systems would be rather large and costly if scaled up to 10 MW. Direct drive superconducting generators have been proposed to reduce the generator size, because the electrical machines with superconducting windings are capable of achieving a higher torque density. However, a superconducting machine is likely to produce an excessive torque during a short circuit because of its small reactance. An electromagnetic (EM) shield between the rotor and the stator as well as iron or non-magnetic composite (NMC) armature teeth affects the sub-transient reactance of a superconducting machine so that they play a role in the short-circuit performance of a superconducting wind generator. This paper presents a 10 MW superconducting generator design and studies the effects of material, thickness and position of an EM shield and the effects of NMC and iron armature teeth on the torque and the field current density during a three-phase short circuit at the generator terminal. One result shows that the short circuit torque is not able to be effectively reduced by varying the EM shield and the armature tooth material. The other result shows that the field current density is likely to exceed its critical value during a short circuit although the EM shield material and the armature tooth material take some effect.",
keywords = "Direct drive, Electromagnetic shield, Field current, Finite element method, Magnesium diboride, Short circuit, Superconducting generator, Torque, Wind turbine",
author = "Dong Liu and Henk Polinder and Abrahamsen, {Asger Bech} and Ferreira, {Jan A.}",
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Liu, D, Polinder, H, Abrahamsen, AB & Ferreira, JA 2015, Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines. in Proceedings of 2015 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, pp. 709 - 714, IEEE International Electric Machines & Drives Conference 2015, Coeur d'Alene, ID, United States, 10/05/2015. https://doi.org/10.1109/IEMDC.2015.7409137

Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines. / Liu, Dong; Polinder, Henk; Abrahamsen, Asger Bech; Ferreira, Jan A.

Proceedings of 2015 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2015. p. 709 - 714.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

T1 - Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines

AU - Liu, Dong

AU - Polinder, Henk

AU - Abrahamsen, Asger Bech

AU - Ferreira, Jan A.

PY - 2015

Y1 - 2015

N2 - To reduce the cost of energy of offshore wind energy conversion, large individual wind turbines of 10 MW or higher power levels are drawing more attention and expected to be desirable. Conventional wind generator systems would be rather large and costly if scaled up to 10 MW. Direct drive superconducting generators have been proposed to reduce the generator size, because the electrical machines with superconducting windings are capable of achieving a higher torque density. However, a superconducting machine is likely to produce an excessive torque during a short circuit because of its small reactance. An electromagnetic (EM) shield between the rotor and the stator as well as iron or non-magnetic composite (NMC) armature teeth affects the sub-transient reactance of a superconducting machine so that they play a role in the short-circuit performance of a superconducting wind generator. This paper presents a 10 MW superconducting generator design and studies the effects of material, thickness and position of an EM shield and the effects of NMC and iron armature teeth on the torque and the field current density during a three-phase short circuit at the generator terminal. One result shows that the short circuit torque is not able to be effectively reduced by varying the EM shield and the armature tooth material. The other result shows that the field current density is likely to exceed its critical value during a short circuit although the EM shield material and the armature tooth material take some effect.

AB - To reduce the cost of energy of offshore wind energy conversion, large individual wind turbines of 10 MW or higher power levels are drawing more attention and expected to be desirable. Conventional wind generator systems would be rather large and costly if scaled up to 10 MW. Direct drive superconducting generators have been proposed to reduce the generator size, because the electrical machines with superconducting windings are capable of achieving a higher torque density. However, a superconducting machine is likely to produce an excessive torque during a short circuit because of its small reactance. An electromagnetic (EM) shield between the rotor and the stator as well as iron or non-magnetic composite (NMC) armature teeth affects the sub-transient reactance of a superconducting machine so that they play a role in the short-circuit performance of a superconducting wind generator. This paper presents a 10 MW superconducting generator design and studies the effects of material, thickness and position of an EM shield and the effects of NMC and iron armature teeth on the torque and the field current density during a three-phase short circuit at the generator terminal. One result shows that the short circuit torque is not able to be effectively reduced by varying the EM shield and the armature tooth material. The other result shows that the field current density is likely to exceed its critical value during a short circuit although the EM shield material and the armature tooth material take some effect.

KW - Direct drive

KW - Electromagnetic shield

KW - Field current

KW - Finite element method

KW - Magnesium diboride

KW - Short circuit

KW - Superconducting generator

KW - Torque

KW - Wind turbine

U2 - 10.1109/IEMDC.2015.7409137

DO - 10.1109/IEMDC.2015.7409137

M3 - Article in proceedings

SP - 709

EP - 714

BT - Proceedings of 2015 IEEE International Electric Machines & Drives Conference (IEMDC)

PB - IEEE

ER -

Liu D, Polinder H, Abrahamsen AB, Ferreira JA. Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbines. In Proceedings of 2015 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE. 2015. p. 709 - 714 https://doi.org/10.1109/IEMDC.2015.7409137