Hywind. Deep offshore wind operational experience.Finn Gunnar Nielsen, Statoil RDI

The starting point -2001

• Inspired by floating sailing marks.

− “Seawind” matured during 2002

Tong, K.C. OWEMES seminar , Atena, Rome,Feb. 1994

2

Key features

Combines known technologies

Designed for harsh environment

”Standard” offshore turbine

Water depth >100 m

Assembled in sheltered waters, towed to field

Relies upon experience from :Floating platforms

Electrical power production

Onshore wind turbines

The Hywind concept

3

From idea to commercial concept

Demo

Pilot park

Model test

Concept & theory

Onshore connected parks

2002

2005

2009

Technical Focus

Cost Focus

Market Focus

2013

Idea

2003

4

Onshore connected parks

What does it take?

Demo

Pilot park

Model test

Concept & theory

Onshore connected parks

2002

2005

2009

Technical Focus

Cost Focus

Market Focus

2013

Idea

2003

5

Onshore connected parks

•Creativity•Competence & experience •Endurance •Business understanding •Professional project execution •Management commitment•Timing •Funding

MODEL SCALE EXPERIMENTS 2005• Demonstration of system behaviour • Validation of numerical tools• Model scale 1:47• Irregular waves, turbulent wind, and various control strategies

6

Assembly and installation of Hywind Demo Summer 2009

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Operation in harsh environment

• Max wind velocity: 40 m/sec

• Max sign wave height: 10.5 m

8

• A total of more than 200 sensors:

− Waves wind and current (magnitude and direction)

− Motion (6 DOF) and position of floater

− Mooring line tension

− Strain gauges at tower and hull (4 levels – bending moments and axial force)

− Rotor speed, blade pitch and generator power

− Flap- and edgeways rotor bending moments

− Motion (tower pitch) / blade pitch controllers

Full scale measurements

9

Hywind Operation and monitoring

10

Databases and data management

•Integration of people process and technology

•Use of data, collaborative technology and multidisciplinary work

Integrated Operations – implementing O&G experience

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A base for testing vessels and access systems• Fob Trim, Stril Merkur (MSDC12), Buddy, Fob Swath1, Bayard 3 • Undertun prototype access system, MaXccess access system

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Hywind performance in 2012

• 2 stops in Q1 due to external grid faults, total 57 days. Production loss of ~1,5 GWh

• Production 2012 is 7,4 GWh (8,9 GWh without grid error)

• 11% lower than normal wind speed

• Capacity factor 2012: 37% (would be 44% without grid error)

• September production 1,1 GWh, Capacity factor 54%.

• Focus on improvements, lower O&M cost

Grid faults

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Production during a storm condition• 24 hour period during

storm “Dagmar”, Dec 2011

• Avg. wind speed 16 m/sec

• Max wind speed 24 m/sec

• Max significant wave height 7.1m

• Power production 96.7% of rated

14

Metocean data. Measured versus design basis

Nacelle wind distribution

Wind statistics

5%

10%

15%

WEST EA ST

SOUTH

NORTH

Wind distribution from turbine.Direction is interpreted as coming from

Distribution from Design Basis

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Data interpretation and validation

0 100 200 3000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Amplitude [ton2-s-1]

Freq

uenc

y [H

z]

Hull_MoorForceX_Pos1_Backup - Black curve is generator speed [RPM/1e4]

Time

Freq

uenc

y [H

z]

Oct/100

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1Gen. below 800Gen. above 800

3P

Surge

Pitch

Poor/No data

• Spectrogram of mooring line force

• 1 month of data shown

• Used for:

− Error detection

− Identification of natural frequencies.

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Full scale versus computations• Wind speed 17.5 m/sec, Significant wave height 4.0m, Current 0.4 m/sec

• Estimated wave time history.

• Computed motion response

• Wind forces included from measured wind spectrum

• Visualization

Tower pitch motion

17

Bending moment in tower.

• Mean wind: 13.2 m/s Hs: 3.2 m Tp: 9.0 s

• East – West and North – South axis

0 0.1 0.2 0.3 0.4 0.5 0.60

1

2

3

4

5

6

7x 10

8 Bending moments about North-axis - Level 3

frequency [Hz]

bend

ing

mom

ent [

(kN

m)2 s]

simulationmeasurement

0 0.1 0.2 0.3 0.4 0.5 0.60

1

2

3

4

5

6

7

8x 10

8 Bending moments about West-axis - Level 3

frequency [Hz]

bend

ing

mom

ent [

(kN

m)2 s]

simulationmeasurement

18

Importance of motion controller

50 100 150 200 250 300 350 400 450 500 550-6

-4

-2

0

2

4

6

time [s]

tow

er p

itch

angl

e [d

eg]

Conventional controller

Motion stabilizing controller

Shut down

19

Hywind evolution Use of experience - Improved design

Hywind Demo Hywind II

• Bigger turbine• Smaller hull• Lower costs• Site specific

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Floating wind will compete with conventional bottom fixed solutions in a mature market

The next step

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Presentation title

Presenters namePresenters titleE-mail address ……@statoil.comTel: +4700000000

www.statoil.com

Thank You23