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dc.contributor.advisorMacpherson, Ewenen
dc.contributor.advisorMueller, Markusen
dc.contributor.authorKeysan, Ozanen
dc.date.accessioned2014-05-23T13:28:23Z
dc.date.available2014-05-23T13:28:23Z
dc.date.issued2014-06-30
dc.identifier.urihttp://hdl.handle.net/1842/8841
dc.description.abstractThis thesis describes four novel superconducting machine concepts, in the pursuit of finding a suitable design for large offshore wind turbines. The designs should be reliable, modular and light-weight. The main novelty of the topologies reside in using a single loop shaped stationary superconducting field winding, which eliminates the rotating transfer couplers and electric brushes or brushless exciters. Furthermore, the electromagnetic forces in the superconducting wire are also eliminated, which simplifies the design and manufacturing of the cryostat and the support structure. Among the four topologies presented, the claw pole type machine is the most promising one. The rotor of the machine composes of claw-poles made from laminated electrical sheets, the superconducting field winding and the armature winding are stationary. The machine is analysed using 3D FEA simulations and a small linear machine prototype is manufactured to verify the simulations. For large scale applications, a double-sided claw pole machine is proposed, which has balanced magnetic attraction forces in the rotor. The machine has a modular cryostat structure, which increases the availability of the machine. Thus, even if a fault occurs in the cryocoolers or in the armature coils, the rest of the machine can operate at partial load until the maintenance is performed. Moreover, it is much easier to replace the faulty parts, as full disassemble of the machine is not required, and a small on-site crane can be used. As a result, it offers operational advantages over the existing superconducting topologies. A 10 MW, 10 rpm generator design is presented, which has a diameter of 6.6 m and an axial length of 1.4 m. The total active mass of the generator is 58 tonnes, and the structural mass is 126 tonnes, which gives a total mass of 184 tonnes. There are four independent cryostats and two independent armature windings in the machine to improve modularity. The biggest advantage of the design is the significantly less superconducting wire usage compared to any other designs; 10 MW machine just needs 15 km of MgB2 wire at 30 K. Thus, it is believed that the proposed topology is a very cost effective and suitable candidate for a successful entry to the wind turbine market.en
dc.contributor.sponsorInstitute for Energy Systemsen
dc.language.isoen
dc.publisherThe University of Edinburghen
dc.relation.hasversionO. Keysan and M. A. Mueller. A Homopolar HTSG Topology for Large Direct- Drive Wind Turbines. IEEE Transactions on Applied Superconductivity, 21(5): 3523-3531, October 2011. ISSN 1051-8223. 10.1109/TASC.2011.2159005. URL https://ieeexplore.ieee.org/xpls/icp.jsp?arnumber=5948361en
dc.relation.hasversionO. Keysan and M. Mueller. Superconducting generators for renewable energy applications. In IET Conference on Renewable Power Generation (RPG 2011), volume 2020, pages 12-12, Edinburgh, 2011. IET. 10.1049/cp.2011.0102. URL http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6136084en
dc.relation.hasversionO. Keysan and M. A. Mueller. A Transverse Flux High-Temperature Superconducting Generator Topology for Large Direct Drive Wind Turbines. In Super- conductivity Centennial Conference, volume 01, pages 1-6, 2011. URL http: //www.sciencedirect.com/science/article/pii/S1875389212019761en
dc.relation.hasversionO. Keysan and M. Mueller. A linear superconducting generator for wave energy converters. In 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012), pages B134-B134, Bristol, 2012. IET. ISBN 978-1- 84919-616-1. 10.1049/cp.2012.0298. URL http://ieeexplore.ieee.org/xpl/ articleDetails.jsp?arnumber=6242150en
dc.relation.hasversionO. Keysan, D. Olczak, and M. A. Mueller. A Modular Superconducting Generator for O shore Wind Turbines. Journal of Superconductivity and Novel Magnetism, pages 1-5, December 2012. ISSN 1557-1939. 10.1007/s10948-012-1950-1. URL http://www.springerlink.com/index/10.1007/s10948-012-1950-1en
dc.relation.hasversionO. Keysan. Application of high temperature superconducting machines to direct drive renewable energy systems. In M. Mueller and H. Polinder, editors, Electrical Drives for Direct Drive Renewable Energy Systems. Woodhead Publication, 2013. ISBN 84569-783-9. URL http://www.woodheadpublishing.com/ en/book.aspx?bookID=2043en
dc.relation.hasversionO. Keysan, J. Burchell, and M. A. Mueller. Magnetic and Structural Analysis of a Transverse Flux Claw Pole Linear Machine (Invited Paper). In IEEE Interna- tional Conference on Industrial Technology, pages 1-5, Cape Town, 2013. URL http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6505968en
dc.subjectsuperconducting generatorsen
dc.subjectwind turbinesen
dc.subjectdirect driveen
dc.titleSuperconducting generators for large off shore wind turbinesen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen


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