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AREVA Energietechnik GmbH Königsbrücker Straße 124 01099 Dresden, Germany AREVA T&D UK Ltd

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW - experience from realized projects and future challenges. AREVA Energietechnik GmbH Königsbrücker Straße 124 01099 Dresden, Germany AREVA T&D UK Ltd St Leonards Avenue ST17 4LX STAFFORD

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AREVA Energietechnik GmbH Königsbrücker Straße 124 01099 Dresden, Germany AREVA T&D UK Ltd

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  1. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW - experience from realized projects and future challenges. AREVA Energietechnik GmbH Königsbrücker Straße 124 01099 Dresden, Germany AREVA T&D UK Ltd St Leonards Avenue ST17 4LX STAFFORD Staffordshire, United Kingdom Uwe Gierer, Sven Höpfner Richard Cooke

  2. Wind Power Goes Offshore • Introduction • First of the First • Painting Systems • Materials Selection • Mechanical Design Concepts • Two Years Later • The Hermetic Transformer • A new corrosion protection system for radiators • Larger Projects • The sea-water cooling system • The AREVA Offshore Platform (AOP) • Other Offshore Platform Concepts • Summary

  3. Possibilities to Connect Offshore GridsOverview • Selection criteria • Technical advantages vs. disadvantages • Fulfilment of grid connection requirements • Investment costs • Operation costs • Possibility to expand • Systems availability • Manufacturing capabilities + delivery times • Options • High voltage alternate current (HV AC) • High voltage direct current HVDC (VSC technology) • High volage direct current HVDC (LCC technology with synchronous compensators)

  4. First Of the First - Barrow (UK), 90 MW • Completion: 06-2006 • Platform: Substation 33 kV / 132 kV • Length – 23m • Width – 15m • Height – 10m • Weight – 440 tons • Power: 30 x 3 MW = 90 MW • AC connection to Heysham S/S (UK) • Cable length: 28 km (thereof 24 km sea cable) • Water depth: approx. 20 m • Tidal range 10 m • High waves

  5. Barrow (UK), 90 MWcont’d • Modularised equipment • 33kV Board – including protection • 33/132kV 120MVA Transformer with OLTC • 132kV GIS • Relay and control panel suite room • Container for LVAC und DC system (incl. UPS for nautical systems) • 225kVA auxiliary diesel generator • Emergency shelter und workshop container • 5MVAr Shunt capacitor bank modules • HVAC Systems • INERGEN / water fire extinguishing system

  6. Painting Systems / Materials Selection Typical hand rail socket External module door hinge

  7. Mechanical Design Concepts Typical door sill with external seal Typical optimised door design

  8. Robin Rigg (UK), 180 MW • Completion: 07-2009 • Platform: 33 kV / 132 kV • Power: 60 x 3 MW = 180 MW • AC connection to Seaton S/S (UK network) • Cable length: 12 km (thereof 9 km sea cable) • Water depth: approx. 30 m

  9. Robin Rigg (UK), 180 MWcont’ • Twin platforms, each • Length – 50 m • Width – 30 m • Heigh – 12 m • Weight – 680 tons

  10. Alpha Ventus (Germany), 60 MW • Completion: 09-2008 • Platform: 33 kV / 110 kV • Power: 12 x 5 MW = 60 MW • AC connection to German mainland via island Norderney • Cable length: 60 km • Water depth: approx. 30 m • Platform, • Length – 24 m • Width – 18 m • Height – 10 m • Weight – 700 tons

  11. Alpha Ventus (Germany), 60 MW cont‘d Quelle: IMS Ingenieurgesellschaft mbH

  12. Onshore Erection Site - Alpha Ventus 60 MW GIS – Installation in container Offshore batterie system Erection site (w/o transformer)

  13. Offshore Installation - Alpha Ventus 60 MW

  14. Hermetic Transformer for Alpha Ventus

  15. A new corrosion protection system for radiators radiator with cataphoretic painting Salt spray test after 1,500h max. undermining 0.7 µm (allowed 1 µm)

  16. The sea-water cooling system

  17. AREVA Offshore Platform (AOP) Patent pending

  18. STRAND JACKS TRANSFORMER & SUPPORT GRILLAGE Use of jacking system as part of Transformer off loading solution

  19. Summary • First projects of its kind projects have • Steep learning curves with fast transfer to new projects • Harsh operational conditions need • Increased corrosion protection for all systems • Learning from other industries (Oil & Gas, automotive,…) • Weather dependent restricted access need • Minimized offshore installation & service time • Integrated service concepts with wind farm operators • Future wind farms need offshore substations with • Innovations in technical design (such as self-floating and self-installing platforms, centralised water-cooled systems a.o.) • An integrated mechanical & electrical design approach

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