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December 2009
Challenge the future
DelftUniversity ofTechnology
The Delft Offshore Wind Turbine Concept (DOT)
Antonio Jarquín Laguna
A hydraulic solution for offshore wind energy
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2The Delft Offshore Wind Turbine Concept (DOT) | 16
Table of Contents
• Current turbine technology
• Delft Offshore Turbines
• Hydraulic energy transfer
• Overview DOT project
• Preliminary results
• Conclusions
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3The Delft Offshore Wind Turbine Concept (DOT) | 16
Current Turbine Technology
General
• Danish concept (3 blades)
• Heavy nacelle
• Huge gearbox + big generator
• Huge amounts of switch gear
Many components
�many failures
� high maintenance
Offshore
• Difficult installation
• Difficult maintenance
� Not yet cost effective without government subsidies
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4The Delft Offshore Wind Turbine Concept (DOT) | 16
Delft Offshore Turbines (DOT)
TU Delft: step away from incremental improvements
�Design turbines specifically for offshore
Two main drivers:
• Size
• Cost of energy
So, let us start by… ?
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5The Delft Offshore Wind Turbine Concept (DOT) | 16
Delft Offshore Turbines (DOT)
Everything out of the nacelle!
So, we only have:
• rotating kinetic energy• a point to deliver electrons
� Everything in between is for us to design
?
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6The Delft Offshore Wind Turbine Concept (DOT) | 16
Power Transmission
• Current systems:
• High top-mass• High cost of components• Dynamic loads• High maintenance
• Solution?
� use hydraulic power transmission: we pump!
Delft Offshore Turbines (DOT)
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Hydraulic energy transfer
Hydraulic Wind Turbines
• Advantages
• Gearless transmission
• More robust than mechanical
gearboxes
• High power-to-weight ratio
• Damping of dynamic loads
• High reliability/Low maintenance
• Challenges
• High efficiency
• Seawater as hydraulic fluid
• Wide operational range (!)
• Vital components not available
(Scaling effects)
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Overview DOT
Fixed displacement
pump
-No need of control without
significant loss of efficiency
- ηvol can be improved (internal seals and
scaling effects)
Fixed displacement
motor
Variable displacement
pump
-No need of control, high efficiency
-Control to get high performance
with high pressures and low flows
-Constant pressure to allow
connection with other turbines
-Reduced friction losses
Seawater line
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Centralized electricity generation
Hydro Plant
Electricity to shore
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Centralized electricity generation
• Hydraulic turbines
• Hydro- power plants have the highest operating
efficiency of all known generation systems
• No need of dam or large reservoir
• Large capacities up to 400 MW per unit
• High efficiency at partial loads (>90 %)
• Onshore operation and control
• Largely automated (operating costs are relatively low)
• High Voltage
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Hydraulic wind developments
Current hydraulic wind developments(Hydraulic transmission)
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Preliminary Results
For a single turbine
• Comparable power
compared with a
commercial turbine
• Limited by rotor loads
No longer limited by Max torque of individual generators!!
0 2 4 6 8 10 12 14 160
2
4
6
8
10
12Powercurves
Wind Speed U [m/s]
Pow
er [
MW
]
PDOT single turbine
PRePow er 5 MW
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Preliminary Results
For 20x turbinesConnected in parallel
• Lower energy
production for low
wind speeds
• High potential for high
wind speeds
0 2 4 6 8 10 12 14 160
50
100
150
200
Powercurves Total
Wind Speed U [m/s]
Pow
er [
MW
]
PDOT
PRePow er 5MW W20x
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Preliminary Results
Efficiencies
• Main limitation driven
by the variable
displacement pump
performance
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
ηgenerator
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
ηgenerator
ηpiping
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
ηgenerator
ηpiping
ηclosed loop
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
ηgenerator
ηpiping
ηclosed loop
ηvarpump
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
ηgenerator
ηpiping
ηclosed loop
ηvarpump
ηFinal
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Conclusions
• Centralized electricity generation can be possible with hydraulics
transmission
• High potential for high wind speeds
• Further analysis in dynamics and control
• Economical study needed
• Challenges
• Seawater as an hydraulic fluid (wear and corrosion)
• Availability of components
A solution for large wind offshore
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16The Delft Offshore Wind Turbine Concept (DOT) | 16
es, we can!
Thank you!!
Questions…?
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17The Delft Offshore Wind Turbine Concept (DOT) | 16
General configuration
~
M
20x
300 bar
∆p up to 350 bar
High pressure
Low
pressure
Rotor
Pump 1
Motor
Pump 2
Seawater
Pelton
turbine
Synch
Generator
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Concept of the DOT energy transfer system
Mechanical
Energy
Hydraulic
Energy
Electrical
Energy
Wind
Energy (KE)
RotorWind SpeedT
ωHydraulic
Pump
p
Q
Generato
r
Platform
Electrical
power
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0 2 4 6 8 10 12 14 160.7
0.75
0.8
0.85
0.9
0.95
1Energy transfer performance
Wind Speed U [m/s]
η max
Fix Dp
Var Dp
Variable displacement pump
0 2 4 6 8 10 12 14 160
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2Volumetric displacement of the pump
Wind Speed U [m/s]
Dp [
m3 /r
pm]
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
0.05 Dpnom
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
0.05 Dpnom
0.10 Dpnom
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
0.05 Dpnom
0.10 Dpnom
0.15 Dpnom
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
0.05 Dpnom
0.10 Dpnom
0.15 Dpnom
0.25 Dpnom
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
0.05 Dpnom
0.10 Dpnom
0.15 Dpnom
0.25 Dpnom
0.50 Dpnom
0 2 4 6 8 10 12 14 160
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Energy transfer performance
Wind Speed U [m/s]
η
0.05 Dpnom
0.10 Dpnom
0.15 Dpnom
0.25 Dpnom
0.50 Dpnom
1.0 Dpnom