dc.contributor.advisor | Macpherson, Ewen | en |
dc.contributor.advisor | Mueller, Markus | en |
dc.contributor.author | Keysan, Ozan | en |
dc.date.accessioned | 2014-05-23T13:28:23Z | |
dc.date.available | 2014-05-23T13:28:23Z | |
dc.date.issued | 2014-06-30 | |
dc.identifier.uri | http://hdl.handle.net/1842/8841 | |
dc.description.abstract | This 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.sponsor | Institute for Energy Systems | en |
dc.language.iso | en | |
dc.publisher | The University of Edinburgh | en |
dc.relation.hasversion | O. 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=5948361 | en |
dc.relation.hasversion | O. 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=6136084 | en |
dc.relation.hasversion | O. 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/S1875389212019761 | en |
dc.relation.hasversion | O. 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=6242150 | en |
dc.relation.hasversion | O. 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/s10948-012-1950-1 | en |
dc.relation.hasversion | O. 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=2043 | en |
dc.relation.hasversion | O. 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=6505968 | en |
dc.subject | superconducting generators | en |
dc.subject | wind turbines | en |
dc.subject | direct drive | en |
dc.title | Superconducting generators for large off shore wind turbines | en |
dc.type | Thesis or Dissertation | en |
dc.type.qualificationlevel | Doctoral | en |
dc.type.qualificationname | PhD Doctor of Philosophy | en |