Short-circuit characteristics of superconducting permanent magnet generators for 10 MW wind turbines

Dong Liu, Xiaowei Song, Xuezhou Wang, Mohamed Elhindi, Urfan Hasanov, Xiaofan Gou, Changqing Ye

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Abstract

Superconducting permanent magnet generators (SCPMGs) are a potential candidate for 10 MW direct-drive wind turbine applications. This paper presents two 10 MW SCPMG designs using MgB<sub>2</sub> cables for the armature winding and investigates the short-circuit characteristics of the designed SCPMGs. The first part of the results shows that the SCPMGs can double the shear stress of a conventional low-speed permanent magnet (PM) generator (from 65 kPa to 130 kPa) whilst avoiding demagnetization of the PMs in rated-load operation. However, the power factor has to drop to a range of 0.7-0.8. The second part of the results shows that during a sudden three-phase short circuit, the superconducting armature winding is prone to quench and the PMs are likely to be demagnetized in both proposed designs.

Original languageEnglish
Article number5201005
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Volume31
Issue number5
DOIs
Publication statusPublished - 2021

Keywords

  • Demagnetization
  • MgB2
  • permanent magnet
  • short circuit
  • superconducting generator
  • wind turbine

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