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
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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
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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
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• 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
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Hywind Operation and monitoring
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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
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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
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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
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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
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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