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

Content Provider	IEEE Xplore Digital Library
Author	Liu, Dong Polinder, Henk Abrahamsen, Asger B. Ferreira, Jan A.
Copyright Year	2015
Description	Author affiliation: DC systems, Energy, Conversion & Storage Group, Delft, University of Technology, Delft 2628 CD, the Netherlands (Liu, Dong; Polinder, Henk; Ferreira, Jan A.) \|\| Department of Wind Energy, Technical University of Denmark, Roskilde 4000, Denmark (Abrahamsen, Asger B.)
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.
Starting Page	709
Ending Page	714
File Size	893519
Page Count	6
File Format	PDF
e-ISBN	9781479979417
DOI	10.1109/IEMDC.2015.7409137
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Generators Windings Superconducting magnets Torque Iron Integrated circuit modeling Wind turbines wind turbine Direct drive electromagnetic shield field current finite element method magnesium diboride short circuit superconducting generator torque
Content Type	Text
Resource Type	Article

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