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

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 20092 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

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 20096 6

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)

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 20098 8

►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

First Of the First - Barrow (UK), 90 MW

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 20099 9

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

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200910 10

Painting Systems / Materials Selection

Typical hand rail socket

External module door hinge

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200911 11

Mechanical Design Concepts

Typical door sill with external seal

Typical optimised door design

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200913 13

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

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200914 14

Robin Rigg (UK), 180 MWcont’

Twin platforms, each

Length – 50 m

Width – 30 m

Heigh – 12 m

Weight – 680 tons

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200915 15

►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

Alpha Ventus (Germany), 60 MW

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200916 16

Alpha Ventus (Germany), 60 MW cont‘d

Quelle: IMS Ingenieurgesellschaft mbH

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200917 17

Onshore Erection Site - Alpha Ventus 60 MW

GIS – Installation in container

Offshore batterie system

Erection site (w/o transformer)

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200918 18

Offshore Installation - Alpha Ventus 60 MW

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200919 19

Hermetic Transformer for Alpha Ventus

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200921 21

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)

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200923 23

The sea-water cooling system

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200926 26

AREVA Offshore Platform (AOP) Patent pending

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200928 28

Use of jacking system as part of Transformer off loading solution

STRAND JACKS

TRANSFORMER & SUPPORT GRILLAGE

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200930 30

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

Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 200931 31