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High-Temperature Superconducting Generators for Direct Drive Applications OZAN KEYSAN Institute for Energy Systems The University of Edinburgh May 2011

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Ozan KEYSAN 2 Power Applications Courtesy AMSC, InnoPower Superconductor Transmission Lines Fault Current Limiter

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Ozan KEYSAN 3 Power Applications : Electrical Machines Courtesy of Siemens, Converteam (ALSTOM) Siemens: 400 kW Converteam (ALSTOM): 5 MW HTS

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Ozan KEYSAN 4 Power Applications : Electrical Machines 36.5 MW, 120 rpm (U.S. Navy, AMSC) Courtesy of AMSC

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Ozan KEYSAN 5 Wind Turbine Applications? M. Lesser, J. Müller, “Superconductor Technology – Generating the Future of Offshore Wind Power,” BARD 5MW

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Ozan KEYSAN 6 Direct-Drive Solutions

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Ozan KEYSAN 7 Cost Comparison (HTSG vs. PMG) Lesser2009

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Ozan KEYSAN 8 Types of HTS Machines Rotating DC Superconducting Field Most Common Type Transient Torques on HTS wire Cryocooler Coupler + Brushes Low Reliability Cooling Times Magnetized Bulk HTS Very Difficult to Handle Demagnetization All Superconducting Machines AC Losses on HTS wire

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Ozan KEYSAN 9 Reliability? Stationary SC Coil No Cryogenic Coupler No Brushes No Transient Torque on SC Simplified Cooling, Isolation DC Field No AC losses Maximized Current

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Ozan KEYSAN 10 Homopolar HTSG

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Ozan KEYSAN 11 Homopolar HTSG

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Ozan KEYSAN 12 Axial Bipolar HTS Machine

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Ozan KEYSAN 13 Bonus: Bipolar Linear HTSG Suitable for WECs

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Ozan KEYSAN 14 Transversal Flux HTSG

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Ozan KEYSAN 15 Prototype < 1m Diameter 250 rpm 5 kW

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Ozan KEYSAN 16 SC Winding – Cryocooler Inner Diameter:300mm Outer Diameter:400mm 125m YBCO Wire (0.1x12 mm) Excited with DC Source Liquid Nitrogen Cooled (maybe Neon) Similar cooling system to homopolar HTS motors. T. Zhang, K.Haran, E.T. Laskaris,J.W. Bray, “Design and Test of a Simplified and Reliable Cooling System for High Speed Superconducting Generator Applications,”

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