Superconducting Generators for Large Wind Turbines Ozan Keysan o.keysan@ed.ac.uk Institute for...

Superconducting Generators for Large Wind Turbines

Ozan Keysan

o.keysan@ed.ac.ukInstitute for Energy SystemsThe University of Edinburgh

26/09/2012

Motivation

BARD 5MWGlobal Offshore Wind Energy Markets and Strategies,2009

In 2020, 85% of offshore wind turbine installations will be larger than 5 MW

Wind Turbines: Constantly Growing How big?

UpWind Project: A 20 MW Wind Turbine is Feasible

www.upwind.eu

Superconducting Machines

Courtesy of Siemens, Converteam (ALSTOM)

Siemens: 400 kW

Converteam (ALSTOM): 5 MW HTS

Power Applications : Electrical Machines

36.5 MW, 120 rpm (U.S. Navy, AMSC)

Courtesy of AMSC

Mass of Direct-Drive Generators

Harakosan 1.5MW,18 rpm,47 tonnes

(*) D. Bang et.al. “Review of Generator Systems for Direct-Drive Wind Turbines,” 2008,

All data available at goo.gl/ZZivv

Enercon4.5 MW, 13 rpm220 tonnes

All data available at goo.gl/ZZivv

Mass of Direct-Drive Generators

Reliability of Wind Turbines

Hahn, B., & Durstewitz, M. (2007). Wind Energy-Reliability of Wind Turbines.

~1MW, 1500 onshore turbines

Reliability?

Cooling System Cryogenic Couplers Electric Brushes Transient torques on

SC Demagnetization for

Bulk SC AC losses on SC wire

Issues with Superconducting GeneratorsSeaTitan

AMSC, 10 MW, 10 rpm

Direct-drive superconducting generator

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)

Transverse Flux HTSG

Linear Prototype

Linear Prototype

Some Photos & A Short Video

Next Stage A Superconducting

Field Winding Simple Insulation LN2 bath

Design for Large Wind Turbine 10 MW 10 rpm Mass/Cost

Estimation

THANKS