Calculation of AC loss in an HTS wind turbine generator

Fee, M; Staines, MP; Buckley, RG; Watterson, PA; Zhu, JG

Calculation of AC loss in an HTS wind turbine generator

Fee, M Staines, MP Buckley, RG Watterson, PA Zhu, JG

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Publication Type:: Journal Article
Citation:: IEEE Transactions on Applied Superconductivity, 2003, 13 (2 II), pp. 2193 - 2196
Issue Date:: 2003-06-01

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Field	Value	Language
dc.contributor.author	Fee, M	en_US
dc.contributor.author	Staines, MP	en_US
dc.contributor.author	Buckley, RG	en_US
dc.contributor.author	Watterson, PA	en_US
dc.contributor.author	Zhu, JG https://orcid.org/0000-0002-9763-4047	en_US
dc.date.issued	2003-06-01	en_US
dc.identifier.citation	IEEE Transactions on Applied Superconductivity, 2003, 13 (2 II), pp. 2193 - 2196	en_US
dc.identifier.issn	1051-8223	en_US
dc.identifier.uri	http://hdl.handle.net/10453/5813
dc.description.abstract	In order to achieve lower cost of energy the typical power rating of large wind turbine generators has steadily increased over recent years. However, with the mast-top weight of multi-megawatt generators exceeding 100 tonnes, installation becomes increasingly costly and difficult. Direct drive turbine designs can give significant weight and cost reductions. We have developed a design for a lightweight direct drive transverse flux generator with a rating of 2 MW. The design features a multi-pole permanent magnet rotor with a single global HTS stator coil of between 4 and 6 m diameter for each phase. As one consequence of this design approach, the HTS conductor is exposed to leakage field from the magnets and the self-field of the generated current. The magnitude of the loss associated with these time-varying fields is crucial to the viability of the HTS generator concept. The stator design seeks to minimize exposure of the HTS tape to alternating magnetic fields perpendicular to the face of the tape in order to reduce the AC loss in the stator coils to an acceptable level. For a coil operating at 50 Hz, the total AC loss is calculated as 15.1 W/m. Thus, AC losses within each of the three 6 m diameter HTS global coils of a 2 MW generator would be 285 W. The thermal load for the cryogenic system of the 2 MW generator is estimated to total 936 W, with the majority (90%) due to AC loss. Assuming a cryogenic specific power of 20, the energy required to cool the 2 MW generator represents less than 1% of total output.	en_US
dc.relation.ispartof	IEEE Transactions on Applied Superconductivity	en_US
dc.relation.isbasedon	10.1109/TASC.2003.813032	en_US
dc.subject.classification	General Physics	en_US
dc.title	Calculation of AC loss in an HTS wind turbine generator	en_US
dc.type	Journal Article
utslib.citation.volume	2 II	en_US
utslib.citation.volume	13	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0912 Materials Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
utslib.copyright.status	closed_access
pubs.issue	2 II	en_US
pubs.publication-status	Published	en_US
pubs.volume	13	en_US

Abstract:

In order to achieve lower cost of energy the typical power rating of large wind turbine generators has steadily increased over recent years. However, with the mast-top weight of multi-megawatt generators exceeding 100 tonnes, installation becomes increasingly costly and difficult. Direct drive turbine designs can give significant weight and cost reductions. We have developed a design for a lightweight direct drive transverse flux generator with a rating of 2 MW. The design features a multi-pole permanent magnet rotor with a single global HTS stator coil of between 4 and 6 m diameter for each phase. As one consequence of this design approach, the HTS conductor is exposed to leakage field from the magnets and the self-field of the generated current. The magnitude of the loss associated with these time-varying fields is crucial to the viability of the HTS generator concept. The stator design seeks to minimize exposure of the HTS tape to alternating magnetic fields perpendicular to the face of the tape in order to reduce the AC loss in the stator coils to an acceptable level. For a coil operating at 50 Hz, the total AC loss is calculated as 15.1 W/m. Thus, AC losses within each of the three 6 m diameter HTS global coils of a 2 MW generator would be 285 W. The thermal load for the cryogenic system of the 2 MW generator is estimated to total 936 W, with the majority (90%) due to AC loss. Assuming a cryogenic specific power of 20, the energy required to cool the 2 MW generator represents less than 1% of total output.

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http://hdl.handle.net/10453/5813