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High-Temperature Superconducting Generators for Direct Drive Applications. [email protected] Institute for Energy Systems The University of Edinburgh. OZAN KEYSAN. April 2011. Superconductor?. Abolish the OHM’s Law. Zero Resistivity. Kakani2009. MERCURY. - PowerPoint PPT Presentation
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High-Temperature Superconducting Generators for Direct Drive Applications
OZAN [email protected] for Energy SystemsThe University of EdinburghApril 2011
Superconductor?Abolish the OHMs LawKakani2009Zero Resistivity
MERCURYThe First Superconductor Material Discovered in 1911Critical Temp = 4.2 K (-269 C)
Other SuperconductorsLIQUID NITROGEN?? OH NO!Schiferl2006
Infinite Current? Unfortunately NOT.www.superox.ru
YBCO (YBa2Cu3O7 )Current Density > 200 A/mm2 (5-10 A/mm2 for copper)
Perfect Diamagnetism
Applications: MagLev Train
Applications: Large Hadron ColliderSuperconducting Magnets Up to 16 T, Normal PM ~1.5 T
Applications: MRI
Power ApplicationsCourtesy AMSC, InnoPower SuperconductorTransmission LinesFault Current Limiter
Power Applications : Electrical MachinesCourtesy of Siemens, Converteam (ALSTOM)Siemens: 400 kWConverteam (ALSTOM): 5 MW HTS
Power Applications : Electrical Machines36.5 MW, 120 rpm (U.S. Navy, AMSC)Courtesy of AMSC
Wind Turbine Applications?
M. Lesser, J. Mller, Superconductor Technology Generating the Future of Offshore Wind Power, BARD 5MW
Direct-Drive Solutions
Cost Comparison (HTSG vs. PMG)Lesser2009
Types of HTS MachinesRotating DC Superconducting FieldMost Common TypeTransient Torques on HTS wireCryocooler Coupler + Brushes Low ReliabilityCooling TimesMagnetized Bulk HTSVery Difficult to HandleDemagnetizationAll Superconducting MachinesAC Losses on HTS wire
Reliability?Stationary SC CoilNo Cryogenic CouplerNo BrushesNo Transient Torque on SCSimplified Cooling, IsolationDC FieldNo AC lossesMaximized Current
Homopolar HTSG
Homopolar HTSG
Axial Bipolar HTS Machine
Bonus: Bipolar Linear HTSGSuitable for WECs
Transversal Flux HTSG
Hasta la Vista!Thanks.
Larger Offshore Wind Turbines (>5MW)Gearboxes unfeasibleDirect DriveLow Speed High TorqueMore ReliableHigh Generator MassHigh Installation Cost