concrete floating platform for wind turbines - eu-japan.eu · pdf filespar buoy monolithic...
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Concrete Floating Platform for Wind Turbines
Dr. Climent Molins
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01What is Windcrete?
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Integrated concept of an offshore wind floating
platform plus tower for supporting the wind
turbine, without any joint
Made of reinforced and prestressed concrete
Spar type platform (ballast stabilized)
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The philosophy
2012: Concept
UPC patent
20th Century
HYDRO POWER
• Large passive structures
• Minimum OPEX costs
OPEX MAINLY FOCUSED ON
THE TURBINE SYSTEM
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2012: Concept
UPC patent
• Active or passive structure
• Robustness
• Foundation OPEX costs
21st Century
OFFSHORE WIND?
The philosophy
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Avoiding joints between the tower and the floater
Substructure Grouted Connection
Problems in the connection between monopiles and tower, i.e. Princess Amalia Wind Farm
The philosophy
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Spar buoy
Monolithic
concrete
platform (buoy
+ tower) without
jointsReduced
OPEX
Variable Draft
(80 m – 130 m)
Operational
depth (100 m to
>1000 m)
Low cost –
reduced
CAPEX
Adaptative
design, able
to support
wind turbines
up to 15 MW
Life-span
>50 years
Reduced
LCOE
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02Proof of Concept
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Proof of conceptKIC Innoenergy AFOSP project – Simulations & Experiments
Free decay
tests
1:100 scaled
experiments
Numerical
results validated
in the CIEM-UPC
wave flume
Wave and wind
force experiments,
composed
in different directions
& different wave
heights
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Proof of conceptKIC Innoenergy AFOSP project – Simulations & Experiments
The scaled model (1:100) Laboratori d’Enginyeria Marítima (CIEM-LIM)
• Length: 100m.
• Width: 3m.
• Max depth: 7m.
• Max. Wave height: 1,6m.
• Regular & Irregular wave
generation.
• CIEM wave flume:
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Proof of conceptKIC Innoenergy AFOSP project – Simulations & Experiments
Numerical models calibration
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NREL 5WT WT Campbell’s diagram
Modal Analysis
Proof of conceptKIC Innoenergy AFOSP project – Simulations & Experiments
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Coupled aero-hydro-servo-elastic FAST simulation
IEC61400-3 DLC‘s
Proof of conceptKIC Innoenergy AFOSP project – Simulations & Experiments
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d=0
Bending moments and shear forces
Limit State SF
Ultimate Limit State 1.35Fatigue Limit State 1.00
Axial force
Structural analysis: ULS
Proof of conceptKIC Innoenergy AFOSP project – Simulations & Experiments
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Structural Analysis: Fatigue assessment
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
0,4
0 5 10 15 20 25 30 35 40 45 50
D
Years
Floater Mid tower Tower Base
Max. D ≤ 0.4
50 years cumulated damage (D)
Proof of conceptKIC Innoenergy AFOSP project – Simulations & Experiments
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03Installation
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Construction & Dry dock
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Transport & Tug boat
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Erection
- Water ballasting - Dynamic control
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Wind turbine installation
- Catamaran ship
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Emerging
- Aggregate ballasting
Ballast: black slag, a by-product of electrical furnaces, to reduce costs and environmental footprint.
25 kN/m3 specific weight
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04Cost analysis
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Concrete Steels Ballast
522
5,910
1,454
175 278
Steel SPAR
Concrete SPAR
Concrete vs. Steel cost comparison
2,000
4,000
6,000
8,000
10,000
0
5MW WT SPAR equivalent designs
Campos et al. “Spar concrete monolithic design for offshore wind turbines”. Proceedings of the Institution of Civil Engineers –
Maritime Engineering. Volume 169 Issue 2, June, 2016, pp. 49-63
k€
The Product: Platform + tower
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LCOE WINDCRETE: 14.27 €ct/kwh(1)
Scenario:
Gross Load Factor: 51%
Water depth: 145m
Distance to shore: 20km
Turbine size: 10MW
Including 1.77€ct/kwh of transimission charges without seabed rent
Substructure plus tower CAPEX is 1,498 k€/MW
(1) Ebenhoch, R., Matha, D., Marathe, S., Cortés, P. & Molins, C. (2015) Comparative Levelized Cost of Energy Analysis,
EERA DeepWind 2015 Conference
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Milestones
2012: Concept
UPC patent
2013-2014:
KIC InnoenergyAFOSP project
Proof of Concept
2016-2018:
Detail
engineering for
100 kW
prototype
2018-2020:
100 kW unit
and field tests
2021:
Prototype
…
Industrialization &
Commercialization
1 2
3 4