Superconducting Generators for Large Wind Turbines Ozan Keysan [email protected]

Institute for Energy Systems The University of Edinburgh 26/09/2012

Motivation BARD 5MW In 2020, 85% of offshore wind turbine installations will be larger than 5 MW Global Offshore Wind Energy Markets and Strategies,2009

 Wind Turbines: Constantly Growing

How big?

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UpWind Project: A 20 MW Wind Turbine is Feasible

www.upwind.eu

Superconducting Machines  Converteam (ALSTOM): 5 MW HTS  Siemens: 400 kW Courtesy of Siemens, Converteam (ALSTOM)

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

Mass of Direct-Drive Generators Enercon 4.5 MW, 13 rpm 220 tonnes Harakosan 1.5MW,18 rpm,47 tonnes All data available at goo.gl/ZZivv (*) D. Bang et.al. “Review of Generator Systems for Direct-Drive Wind Turbines,” 2008,

Mass of Direct-Drive Generators All data available at goo.gl/ZZivv

Reliability of Wind Turbines ~1MW, 1500 onshore turbines Hahn, B., & Durstewitz, M. (2007). Wind Energy-Reliability of Wind Turbines.

Reliability?

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Issues with Superconducting Generators Cooling System Cryogenic Couplers Electric Brushes Transient torques on SC Demagnetization for Bulk SC AC losses on SC wire

SeaTitan AMSC, 10 MW, 10 rpm Direct-drive superconducting generator

Transverse Flux HTSG

Transverse Flux HTSG  

Pros

 Single Stationary SC Coil    No Brushes No Cryogenic Coupler Bidirectional flux  High Torque Density

Cons

  Magnetic Attraction Forces 3D Flux (Soft magnetic composites needed)

Linear Prototype

Linear Prototype Some Photos & A Short Video

Next Stage 

A Superconducting Field Winding

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Simple Insulation

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LN2 bath

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Design for Large Wind Turbine

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10 MW 10 rpm

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Mass/Cost Estimation

THANKS