a floating multi turbines platform - sintefwindsea as, january 2012 marc lefranc a floating multi...
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WindSea AS, January 2012 MARC LEFRANC
A floating multi‐turbines
platform
The Company
• Norwegian company based in Sandvika
• Established in 2008
• Fixed and floating foundations for offshore wind
• Owned by NLI and FORCE Technology
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•Norwegian company
•Engineering, fabrication, and
technology
•Offshore oil & gas, and hydropower
•2000 employees
•50% owner in WindSea
•Norwegian/Danish company
•Engineering, material technology
and Inspection
•Offshore oil & gas, and wind power
•1200 employees
•50% owner in WindSea
WindSea’s solutions
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Floating platform
Fixed jacket structure
Semi-submersible platform
Applicable from 45 meters to very deep water
Carries three full size (5MW+) turbines
Some R&D work still needed
Simple jacket structure
Applicable from 20-50 meters
Cost effective fabrication and installation
Concept is ready for commercial projects
0-10
10 -20
20-30
30-40
40-50
50-60
60-70
> 100
Wa
ter
de
pth
in
me
ters
- 1 000 2 000 3 000 4 000 5 000 6 000 7 000
0-10
10 -20
20-30
30-40
40-50
50-60
60-70
> 100
Wa
ter
de
pth
in
me
ters
Round 1
Round 2
Round 3
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The market for the WindSea’s foundations
Largest growth in water depth > 30m Water depth for use of technology
Potential installed capacity (MW)
Gra
vit
y b
ase
Tri
po
d
Mo
no
pile
Jacket Floating concepts
Source: Crown Estate 2009, edp (The WindFloat Project, May 2010) and WindSea
Fixed substructures
Sem
i su
bm
ers
ible
Sp
ar
bu
oy
WindSea
concepts
WindSea’s jacket concept - cost effective fabrication,
transport and installation
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The WindSea jacket Key facts
Design Vertical legs
Modular design
Piling through legs
Turbines All commercial offshore
turbines
Water depth: 20-50 meters
Access
system
Effective and secure boat
landing and staircase system
Status
Concept ready for commercial
use
•Semi-submersible
platform
• Three columns
•Three turbines
• Mooring system
connected by
a ”turret”.
•Self orientation
against the wind
• Inclined towers
WindSea Floater: Key Facts
Key Facts
• Build complete platform at yard
• Tow with commissioned turbines
• Pre-installed anchor system
• Platform self oriented to the wind
• Easy connection to mooring system
• Optimum power production
• Based on proven technology
•Easy access by helicopter or boat
•Large deck area: allow for maintenance
•May be easily towed back to yard for major repair and
inspection
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Wake Effect / Turbulence
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Wake Effect / Turbulence
•Reduction of power production at the
rear turbine
•No turbulence effect from the up wind
turbines on the rear turbine
•Inclined towers result in less interaction
with the rotor blades
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Power production
Based on a specific field
data, a specific turbine type.
•Total power production of 3
standing alone turbines:
• 44,5 GWh/year
Rear turbine power
reduction: 25 %
•Total power production for
Windsea: 41,4 GWh/year
• 93% of the theoretical
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Power production versus wind velocity
0
0,5
1
1,5
2
2,5
3
3,5
4
5 10 15 20 25
Wind velocity (m/sec)
Po
we
r (M
Wa
tt)
No wake losse With wake losses
Production versus wind velocity
0
1000
2000
3000
4000
5000
6000
7000
5 7 9 11 13 15 17 19 21 23 25 27
Velocity (m/sec)
Pro
du
cti
on
(K
Wh
/y
ea
r)
Model Test: Validation of the concept
•Validate the main principles of
the concept and prove its
physical feasibility.
•Verify interaction between
turbines.
•Verify effect of turbines on
vessel motion.
•Verify effect of vessel motion
on power production.
•Verify the self-orientation
property.
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Model Test: Wind Tunnel
• Aerodynamic interaction in-between the turbines. Scale 1:150
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Model Test: Wind Tunnel
•One wind velocity, 5 directions
•The power of the aft turbine
was reduced to 89% of the
average of port and starboard
turbine power.
•The forward turbines were only
marginally affected by one
another or by the aft turbine.
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7
7,2
7,4
7,6
7,8
8
8,2
8,4
-15 -10 -5 0 5 10 15
Ou
tp
ut
Angle of incidence
Power output
Port Turbine Aft Turbine Starboard turbine
Model Test: Wave Basin
• Interaction between Wave and wind induced motion. Scale 1:64
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Model Test: Wave Basin
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Maximum Motion
Hs Heave Pitch
Without turbine With turbine Without turbine With turbine
2,5 m 0,4 m 0,3 m 0,6° 1°
5,5 m 1,8m 1,6 m 2,2° 3,1°
13,8 m 8,5 m 8,7 m 1,8° 3,4°
Standard deviation
Hs Heave Pitch
Without turbine With turbine Without turbine With turbine
2,5 m 0,1 m 0,08 m 0,17° 0,2°
5,5 m 0,4m 0,38 m 0,38° 0,75° *
13,8 m 2,5 m 2,5 m 0,74° 0,76°
* This high value is due to operational problems during the test. A more refined analysis of the time history is required. Value around 0,3 is most likely.
Model Test: Wave Basin
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Power production
Hs Turbine 1 Turbine 2 Aft Turbine
0 m 3,0 3,0 1,4
2,5 m 3,0 3,0 1,2
5,5 m 3,1 3,3 1,4
13,8 m 3,5 3,0 1,3
Model Test: Conclusions
• Results in accordance with calculations
• No interaction between the two up-wind turbines
• Reduction of power production for the rear turbine
• Heave motion identical for both conditions: with and
without turbines
• Pitch motion slightly increased when turbines are in
action (Hs 5,5 m; 2,2˚ to 3,1˚)
• Power production almost independent of the sea
state
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CONCLUSION
• WindSea Concept has been proven to be
feasible.
• WindSea has a wide range of application area.
• WindSea reduces the cost of installation.
• WindSea reduces the maintenance cost.
• Economic analysis shows that the cost per MW
is at lower bound of today’s solutions.
• Further optimisation / tests will bring the cost
lower.
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Thank You for Your attention
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