Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines

This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are...
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Autor*in:	Liu, Dong [verfasserIn] Polinder, Henk Abrahamsen, Asger B Ferreira, Jan A

Format:	Artikel
Sprache:	Englisch

Erschienen:	2017

Schlagwörter:	high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron _2 ">MgB _2 superconducting (SC) generator low temperature superconductor (LTS)

Übergeordnetes Werk:	Enthalten in: IEEE transactions on applied superconductivity - New York, NY : Inst., 1991, 27(2017), 5, Seite 1-11
Übergeordnetes Werk:	volume:27 ; year:2017 ; number:5 ; pages:1-11

Links:	Volltext Link aufrufen

DOI / URN:	10.1109/TASC.2017.2707661

Katalog-ID:	OLC1996312545

Internformat


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520			\|a This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K.
650		4	\|a high temperature superconductor (HTS)
650		4	\|a Direct drive
650		4	\|a Topology
650		4	\|a Stress
650		4	\|a potential
650		4	\|a Magnetic cores
650		4	\|a Generators
650		4	\|a wind turbine
650		4	\|a Current density
650		4	\|a performance
650		4	\|a Superconducting magnets
650		4	\|a Iron
650		4	\|a MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content>
650		4	\|a superconducting (SC) generator
650		4	\|a low temperature superconductor (LTS)
700	1		\|a Polinder, Henk \|4 oth
700	1		\|a Abrahamsen, Asger B \|4 oth
700	1		\|a Ferreira, Jan A \|4 oth
773	0	8	\|i Enthalten in \|t IEEE transactions on applied superconductivity \|d New York, NY : Inst., 1991 \|g 27(2017), 5, Seite 1-11 \|w (DE-627)130969559 \|w (DE-600)1070182-5 \|w (DE-576)025189840 \|x 1051-8223 \|7 nnns
773	1	8	\|g volume:27 \|g year:2017 \|g number:5 \|g pages:1-11
856	4	1	\|u http://dx.doi.org/10.1109/TASC.2017.2707661 \|3 Volltext
856	4	2	\|u http://ieeexplore.ieee.org/document/7933999
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952			\|d 27 \|j 2017 \|e 5 \|h 1-11

Indexfelder

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publishDate	2017
allfields	10.1109/TASC.2017.2707661 doi PQ20170901 (DE-627)OLC1996312545 (DE-599)GBVOLC1996312545 (PRQ)i941-fb6e2a8888b7f85b97a5dfbc8a2c38a089ff5aa5a29854322529e41bec8dc3930 (KEY)0203240620170000027000500001potentialofpartiallysuperconductinggeneratorsforla DE-627 ger DE-627 rakwb eng 530 620 DNB Liu, Dong verfasserin aut Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K. high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> superconducting (SC) generator low temperature superconductor (LTS) Polinder, Henk oth Abrahamsen, Asger B oth Ferreira, Jan A oth Enthalten in IEEE transactions on applied superconductivity New York, NY : Inst., 1991 27(2017), 5, Seite 1-11 (DE-627)130969559 (DE-600)1070182-5 (DE-576)025189840 1051-8223 nnns volume:27 year:2017 number:5 pages:1-11 http://dx.doi.org/10.1109/TASC.2017.2707661 Volltext http://ieeexplore.ieee.org/document/7933999 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_70 AR 27 2017 5 1-11
spelling	10.1109/TASC.2017.2707661 doi PQ20170901 (DE-627)OLC1996312545 (DE-599)GBVOLC1996312545 (PRQ)i941-fb6e2a8888b7f85b97a5dfbc8a2c38a089ff5aa5a29854322529e41bec8dc3930 (KEY)0203240620170000027000500001potentialofpartiallysuperconductinggeneratorsforla DE-627 ger DE-627 rakwb eng 530 620 DNB Liu, Dong verfasserin aut Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K. high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> superconducting (SC) generator low temperature superconductor (LTS) Polinder, Henk oth Abrahamsen, Asger B oth Ferreira, Jan A oth Enthalten in IEEE transactions on applied superconductivity New York, NY : Inst., 1991 27(2017), 5, Seite 1-11 (DE-627)130969559 (DE-600)1070182-5 (DE-576)025189840 1051-8223 nnns volume:27 year:2017 number:5 pages:1-11 http://dx.doi.org/10.1109/TASC.2017.2707661 Volltext http://ieeexplore.ieee.org/document/7933999 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_70 AR 27 2017 5 1-11
allfields_unstemmed	10.1109/TASC.2017.2707661 doi PQ20170901 (DE-627)OLC1996312545 (DE-599)GBVOLC1996312545 (PRQ)i941-fb6e2a8888b7f85b97a5dfbc8a2c38a089ff5aa5a29854322529e41bec8dc3930 (KEY)0203240620170000027000500001potentialofpartiallysuperconductinggeneratorsforla DE-627 ger DE-627 rakwb eng 530 620 DNB Liu, Dong verfasserin aut Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K. high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> superconducting (SC) generator low temperature superconductor (LTS) Polinder, Henk oth Abrahamsen, Asger B oth Ferreira, Jan A oth Enthalten in IEEE transactions on applied superconductivity New York, NY : Inst., 1991 27(2017), 5, Seite 1-11 (DE-627)130969559 (DE-600)1070182-5 (DE-576)025189840 1051-8223 nnns volume:27 year:2017 number:5 pages:1-11 http://dx.doi.org/10.1109/TASC.2017.2707661 Volltext http://ieeexplore.ieee.org/document/7933999 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_70 AR 27 2017 5 1-11
allfieldsGer	10.1109/TASC.2017.2707661 doi PQ20170901 (DE-627)OLC1996312545 (DE-599)GBVOLC1996312545 (PRQ)i941-fb6e2a8888b7f85b97a5dfbc8a2c38a089ff5aa5a29854322529e41bec8dc3930 (KEY)0203240620170000027000500001potentialofpartiallysuperconductinggeneratorsforla DE-627 ger DE-627 rakwb eng 530 620 DNB Liu, Dong verfasserin aut Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K. high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> superconducting (SC) generator low temperature superconductor (LTS) Polinder, Henk oth Abrahamsen, Asger B oth Ferreira, Jan A oth Enthalten in IEEE transactions on applied superconductivity New York, NY : Inst., 1991 27(2017), 5, Seite 1-11 (DE-627)130969559 (DE-600)1070182-5 (DE-576)025189840 1051-8223 nnns volume:27 year:2017 number:5 pages:1-11 http://dx.doi.org/10.1109/TASC.2017.2707661 Volltext http://ieeexplore.ieee.org/document/7933999 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_70 AR 27 2017 5 1-11
allfieldsSound	10.1109/TASC.2017.2707661 doi PQ20170901 (DE-627)OLC1996312545 (DE-599)GBVOLC1996312545 (PRQ)i941-fb6e2a8888b7f85b97a5dfbc8a2c38a089ff5aa5a29854322529e41bec8dc3930 (KEY)0203240620170000027000500001potentialofpartiallysuperconductinggeneratorsforla DE-627 ger DE-627 rakwb eng 530 620 DNB Liu, Dong verfasserin aut Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K. high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> superconducting (SC) generator low temperature superconductor (LTS) Polinder, Henk oth Abrahamsen, Asger B oth Ferreira, Jan A oth Enthalten in IEEE transactions on applied superconductivity New York, NY : Inst., 1991 27(2017), 5, Seite 1-11 (DE-627)130969559 (DE-600)1070182-5 (DE-576)025189840 1051-8223 nnns volume:27 year:2017 number:5 pages:1-11 http://dx.doi.org/10.1109/TASC.2017.2707661 Volltext http://ieeexplore.ieee.org/document/7933999 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_70 AR 27 2017 5 1-11
language	English
source	Enthalten in IEEE transactions on applied superconductivity 27(2017), 5, Seite 1-11 volume:27 year:2017 number:5 pages:1-11
sourceStr	Enthalten in IEEE transactions on applied superconductivity 27(2017), 5, Seite 1-11 volume:27 year:2017 number:5 pages:1-11
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> superconducting (SC) generator low temperature superconductor (LTS)
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container_title	IEEE transactions on applied superconductivity
authorswithroles_txt_mv	Liu, Dong @@aut@@ Polinder, Henk @@oth@@ Abrahamsen, Asger B @@oth@@ Ferreira, Jan A @@oth@@
publishDateDaySort_date	2017-01-01T00:00:00Z
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Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. 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author	Liu, Dong
spellingShingle	Liu, Dong ddc 530 misc high temperature superconductor (HTS) misc Direct drive misc Topology misc Stress misc potential misc Magnetic cores misc Generators misc wind turbine misc Current density misc performance misc Superconducting magnets misc Iron misc MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> misc superconducting (SC) generator misc low temperature superconductor (LTS) Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines
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topic_title	530 620 DNB Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines high temperature superconductor (HTS) Direct drive Topology Stress potential Magnetic cores Generators wind turbine Current density performance Superconducting magnets Iron MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> superconducting (SC) generator low temperature superconductor (LTS)
topic	ddc 530 misc high temperature superconductor (HTS) misc Direct drive misc Topology misc Stress misc potential misc Magnetic cores misc Generators misc wind turbine misc Current density misc performance misc Superconducting magnets misc Iron misc MgB<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content> misc superconducting (SC) generator misc low temperature superconductor (LTS)
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title	Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines
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title_full	Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines
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title_sort	potential of partially superconducting generators for large direct-drive wind turbines
title_auth	Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines
abstract	This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K.
abstractGer	This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K.
abstract_unstemmed	This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm<inline-formula><tex-math notation="LaTeX">^2</tex-math> </inline-formula>. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB <inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula> superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K.
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title_short	Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines
url	http://dx.doi.org/10.1109/TASC.2017.2707661 http://ieeexplore.ieee.org/document/7933999
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