ELectricity from Ocean Waves

OCEAN WAVE ENERGY
MT5009
ANALYZING HI-TECH OPPORTUNITIES

Team members
Aryoko Wibowo S. A0082149A
Jerico Juico A0091472E
Lim Shoa Siong A0068312L
Padmanaban Vivek A0035842H
Prakash Sambasivam A0027237J
Yeo Lian Sheng A0081976N

OUTLINE

• INTRODUCTION TO WAVE ENERGY
• WAVE ENERGY CONVERSION SYSTEMS
 OSCILLATING WATER COLUMN (OWC)
 OVERTOPPING
• WAVE ENERGY STATUS & OPPORTUNITIES
• CONCLUSION

2

Wave-Energy’s Characteristics

The Process Conversion of Wave’s Potential and Kinetic energy into
Electrical energy.
Constantly generated.
Do not deplete
Notable More depict able and reliable as a source of energy
Characteristics Can be harnessed close to the shoreline, offshore, or
anywhere in-between.
Good forecast ability.
With 12 m/s wave velocity, 10hrs or more forecast ability.
Significance Estimated that 0.2% of Ocean’s untapped energy could
provide power sufficient for the entire world ! [1]

[1] Ocean Wave energy Current Status and Future Prospective by João Cruz 3

Approximate global distribution of wave
power levels (kW/m of wave front)

- Wave resource is strongest on the west coasts, and toward the poles
- At approx. 30 kW/mcl in the Northwest (yearly avg.), a single meter (3.3 feet) of wave has the raw power
for 23 coastal homes. 4

Wave-Energy’s Potential

Wave power available compared to electricity consumption for continents.
The error bars show the 95% confidence intervals.
Quantifying the global wave power resource 5
Kester Gunn*, Clym Stock-Williams E.ON New Build & Technology, Technology Centre, Ratcliffe-on-Soar, Nottingham, England, UK

Methods of Wave Capturing
Oscillating Water Column Overtopping

Point-Absorber
Attenuator

6

Wave Energy Conversion
(1) Control System of WEC

Primary
Power
Energy Generator
Takeoff
Capture

(2) Wave Capturing Methods
Device Name Wave Capturing Method Power Takeoff Generator Storage

Limpet (1) Oscillating Water Column Wells Turbine Induction Flywheel

Wave Dragon (2) Overtopping Kaplan Turbine PMSG Reservoir

DFIG: Doubly-Fed Inductor Generator PMSG: Permanent Magnet Synchronous Generator
LPMG: Linear Permanent Magnet Generator

Source: Frost & Sullivan, “European Wave Energy Market Assessment”, Published Jan 2012
7
Mohamed, K.H.; Sahoo, N.C.; Ibrahim, T.B., “A Survey of Technologies Used in Wave Energy Conversion Systems”

OUTLINE

• Overview
• Efficiency
• Cost
• Scaling
• Components
 OVERTOPPING
• CONCLUSION

8

Oscillating Water Column (OWC)
1 As the wave rises
within the
Oscillating Water
Column (OWC),
Air is compressed
and pushed
through the
turbine

2 As the wave
recedes, the air is
sucked back into
the OWC and past
the turbine

3 The turbine rotates
in the same
direction
regardless of the
direction of air
flow 9

Oscillating Water Column (OWC)

Video Link

Hydrokinetic & Wave Energy Technologies Technical & Environmental Issues Workshop October 26-28, 2005 Cynthia Rudge –Business 10
Development EnergetechAustralia

Typical OWC Efficiencies

11
Source: The Carbon Trust, 2005. Marine energy challenge: oscillating water column wave energy converter evaluation report.

Factors Affecting Wave Capture
Efficiency
Generates useful
power
Power
Water column take-off
heave (PTO)

Front wall
Outgoing
swash /down-
waves
rush

Incoming Water Viscous
waves column slosh losses

Power losses
12

Optimum Damping To Reduce
Power Loss

13

Available Energy Flux vs Ocean
Depth

Available
wave energy
flux
increases as
ocean depth
increases

14

Damaging Waves Occurrence vs
Ocean Depth

Occurrence
of
damaging
waves
decreases
as ocean
depth
increases
15

CAPEX vs Ocean Depth

CAPEX generally
increases as ocean
depth increases

16

Cost Power Production vs Ocean
Depth

Lowest cost of
power production
occurs at ocean
depth of 10 metres

17

Unit Power Cost vs Scale of
Power Plant

Unit cost of power
production decreases
as scale of power
plant increases

18

Deeper Water and Larger Scale
Reduces Power Production Cost
Shallow water with Deep water with multiple
single wave collector wave collectors

Low energy High
flux energy flux

Low High
CAPEX CAPEX

High unit
cost of Low unit cost
power of power
production production
19

Improvement Sensitivity

Improvements in available
wave energy resource and
capture efficiency has greatest

Quality improvement
impact on reducing unit cost of
power production

Cost reduction

20

Geometrical Scaling
in Wave Power Capture
• Geometric Scaling Factor, S = LP / LM
Parameter Symbol Scaling Ratio For Constant Fr
Length L LP / LM S
Area A AP / AM S2
Volume V VP / VM S3
Mass M MP / MM S3
Time T TP / TM S0.5
Velocity V VP / VM S0.5
Acceleration g N.A. 1.0 (g is constant)
Force F FP / FM S3
Power P PP / PM S3.5

By Definition, Power = Rate of Work Done
Work Done Force x Distance Mass x Accelerati on x Length
Power    Massive
Time Time Time
M gL M S L S g
3
3
M L g  scaling
S S
P P M M M M
 
T S 
3.5
P P 0.5 0.5
X S X P M potential!
T P M S T M

Thus for 1:10 geometrical scaling, PP increases by S3.5 which is equivalent to ~3000 times
21
(Assuming all the system components scale up proportionally)

Limitations to Geometric Scaling

• Collector that is linked to a crest in one location
and a trough in another would have reduced
capture efficiency

• Max of 40m wave collector width recommended

• Hence, most companies are scaling up power
plant capacity by using multiple collectors instead
of further scaling up the size of each collector

22

Air Turbines - (Wells) OWC

23

Air Turbine Scaling, Material & Price

24

Oscillating Water Column
Potential for different types of Generator

Per Unit (P.U.) Power

Induction Generator has lower cost
since it is not using expensive
permanent magnet

Machado, I.R.; Bozzi, F.A.; Watanabe, E.H.; Garcia-Rosa, P.B.; Martinez, M.; Molina, M.G.; Mercado, P.E.; , "Wave energy conversion system using
asynchronous generators - a comparative study," Power Electronics Conference (COBEP), 2011 Brazilian , vol., no., pp.286-291, 11-15 Sept. 2011doi:
10.1109/COBEP.2011.6085300URL: http://ieeexplore.ieee.org.libproxy1.nus.edu.sg/stamp/stamp.jsp?tp=&arnumber=6085300&isnumber=6085159
25

Oscillating Water Column
Output Power at Different Sea State

Variable speed generator
performs more efficient in
lower power sea states
otherwise with fixed speed
generator

Synchronous and
Permanent Magnet
generator output
power is more
efficient compare to
Induction Generator

O'Sullivan, D.L.; Lewis, A.W.; , "Generator selection for offshore oscillating water column wave energy converters," Power Electronics and Motion
Control Conference, 2008. EPE-PEMC 2008. 13th , vol., no., pp.1790-1797, 1-3 Sept. 2008doi: 26
10.1109/EPEPEMC.2008.4635525URL: http://ieeexplore.ieee.org.libproxy1.nus.edu.sg/stamp/stamp.jsp?tp=&arnumber=4635525&isnumber=4635237

OUTLINE

 OVERTOPPING
• Overview
• Capacity
• Cost
• Efficiency
• Components
• CONCLUSION
27

Overtopping – “Wave Dragon”
Electricity is generated
3
by running the water
through
turbines in the bottom 1
of the structure Two wave reflectors act
to focus the incoming
waves

2
Waves overtop the
double curved ramp to
reach the reservoir

28

Overtopping – “Wave Dragon”

Video Link
29

Installed Global Capacity of Wave
Power on Trial (MW)

1600 Based on National
Targets set by 4
1400 EU Countries

1200

1000

800

600

400
Ongoing
as planned
200

0
2000 2008 2009 2011 2012 2020
MW 0.5 2.25 0.34 6.4 73.6 1530

http://clean-future.com/renewable-energy/wave-power/wave-farms 30
EU Energy directive January 2008

Cost Comparison Amongst
Various Technologies

Natural Gas and
Wave Dragon Solar PV Wind Biomass
Coal
Energy Density High Moderate Moderate High High
Approx. 1000 x denser
Low – Moderate Low Moderate Very High NA
than wind
Predictability High. Moderate Moderate Moderate Moderate
Accurate forecasts Low except in Dispatchable,
Moderate Dispatchable Dispatchable
days in advance some sites subject to fuel supply
Capacity Factor 30% - 45% 12% - 25% 20% - 40% 85% 50% - 90%
Visual Impact Moderate Unobtrusive Moderate High Very High
Extensive but Extensive but
Limited for large
Potential Sites Extensive Moderate permitting process permitting process
capacity sites
can be lengthy can be lengthy
Cost Per Kilowatt
Hour – Utility Power 12¢* 9 - 19¢ 5 - 24¢ 9 - 14¢ 7 - 15¢

• By YEAR 2025: electricity costs of €0.08/kWh
• By YEAR 2050: electricity costs of €0.03-0.04/kWh*
OCEAN ENERGY TECHNOLOGIES for RENEWABLE ENERGY GENERATION
AUGUST 2009 Peter Meisen President, Global Energy Network Institute (GENI)
Alexandre Loiseau Research Associate, Global Energy Network Institute alexandre.loiseau.10@eigsi.fr
*Centre for Renewable Energy Sources. (2002). Wave energy utilization in Europe – Current status and 31
perspectives. European thematic network on wave energy.

Costs Reduction Opportunity

How is electricity cost expected to reach about
0.03-0.04 €/kWh by 2050?

Main part of the cost reduction and efficiency improvement
should be realized by:
• R&D
– Multi-Level Reservoirs
– Improvised Wave ramp
– Wave Prediction Control Algorithm
• Technical Learning Effects
• Cumulative effects on Costs
32

Multi-level
Reservoir

3-Levels
1-Level

 Maximize Potential Energy
 Improve Constant water
flow to turbine

EXPERIMENTAL STUDY OF A MULTILEVEL OVERTOPPING WAVE POWER DEVICE, Jens Peter http://waveenergy.no/res/animasjoner/workingprincipl
Kofoed, Tud Hald and Peter Frigaard, Hydrulics and Costal Engineering Laboratory, Department of
Civil Engineering Aalborg University, Sohngaardsholmsveu 57, DK-9000, Aalborg, Denmark e4raskere.gif

VERTICAL DISTRIBUTION OF WAVE OVERTOPPING FOR DESIGN OF MULTI LEVEL OVERTOPPING BASED WAVE ENERGY
CONVERTERS Jens Peter KOFOED M. Sc., Ph. D., Assist. prof. Department of Civil Engineering, Aalborg University E-mail: 33
i5jpk@civil.aau.dk

Improvised Wave Ramp

• This wave energy converter
makes use of overtopping
wave energy conversion
technology to rotate a dual
rotor system and convert
wave energy directly into
continuous rotary motion.
• This is done via mini
buckets which are lined up
along the ramp in a angled
direction to support the
rotation.
• Current Overall wave-to-
wire efficiency at 18% could
be increased up to 30%
http://www.kineticwavepower.com/
34

Wave Prediction Control Algorithm

Rc: Hs:
Ramp Wave
Height Height

• 20% higher power production with the improved water flow with
opportunity for further improvement
• This is achieved by improving controls algorithm to better predict Wave
Height, Hs so that Ramp Height, Rc could be adjusted accordingly
SIXTH FRAMEWORK PROGRAMME Project no: 502687 NEEDS; New Energy Externalities Developments for Sustainability INTEGRATED PROJECT 35
Priority 6.1: Sustainable Energy Systems and, more specifically, Sub-priority 6.1.3.2.5: Socio-economic tools and concepts for energy strategy.

Technical Learning Effects

€/kw

Installation cost depending of production accumulated sales volume in GW

• Learning Rate of 14% (progress ratio of 0.86) for the whole period, which is
at the same level as known from the wind industry.
• The investment cost will decrease with increasing accumulated sales


Cumulative effects on Costs

4000 0.25

3500
0.20
3000
2500 0.15
2000

1500 0.10

1000
0.05
500
0 0.00
€/kw 2007 2025 2050 €/kwh 2007 2025 2050

Very Optimistic Optimistic-realistic Pessimistic Very Optimistic Optimistic-realistic Pessimistic

Electricity Investment Cost for Years 2007, Electricity Production Cost for Years 2007,
2025, 2050 2025, 2050

• Gradual cost reduction is anticipated with the technical learning, volume
growth and R&D for improvement in overall efficiency and output.


Hydro Electric Turbine - Overtopping

high flow rate is required
for low headed turbine.

Kaplan turbine is the most
effective for Overtopping
devices.

Opportunity for Efficiency will be
the adjustable blades and
adjustable gates.

38

Structure Material

• Improved understanding of real-
sea performance should result in
is expected to lead to design
optimization and especially
reduction in safety factor of main
structures.
• Innovations in manufacturing
processes such as ‘batch
production’ of multiple units are
likely to reduce manufacturing
costs and improve design through
1. maintenance and servicing
learning. 2. surface treatment
• Use of alternative structural 3. assembly (adjustment on site, crane, earthing)
4. production (e.g. welding, manufacture, adjustment)
materials such GRP (glass- 5. material
6. project planning
reinforced plastics), concrete and http://fibrolux.com/main/grp-profiles/advantages-cost/
rubbers.
39

OUTLINE

 Current Status
 Motivations & Challenges
 Technology Roadmap
 Opportunities
• CONCLUSION

40

Current Status

Source: Frost & Sullivan, “Marine Energy in Europe”, Published Jul 2008
41

Current Status

42

Current Status

43

Breakdown Costs

44 44
Source: Hayward, "The potential of wave energy”, Published in 2011

Motivations & Challenges

45

Technology Roadmap

46

Opportunities

47

Opportunities In Singapore
MADE IN
SINGAPORE

Opportunities
in Singapore

48

MADE IN
SINGAPORE

 Keppel and Sembcorp Marine has shown that it is possible to produce 70% of the
world’s oil rig even though Singapore does not have any oil resources
 Similarly, Singapore could potentially venture into the wave energy market and
become a leader in designing and building WEC platforms (or even power
plants!)
 Cross leveraging from the Emerging regional hub for high-tech alternative energy
research
 Solar photovoltaic cell manufacturing plant, REC, YR 2006
 Wind Energy Giant, VESTAS $500 millions regional research facility setup, YR
2007
 Biodiesel plant (200,000 tonne) commissioned by Peter Cremer of Germany
 Home to the world's most advanced and largest commercial-scale biodiesel
facility producing diesel fuel from renewable feedstocks
 Singapore as Asia's Carbon Hub; Home to the only carbon emissions trading
exchange in Asia

REFRAMING GLOBAL WARMING: TOWARD A STRATEGIC NATIONAL PLANNING FRAMEWORK Scott Victor Valentine 49
National University of Singapore, 469C Bukit Timah Road, Singapore 259772E-Mail: scott.valentine@nus.edu.sg

MADE IN
SINGAPORE

• Hann-Ocean Technology Pte Ltd
– 7030 Ang Mo Kio Avenue 5, #09-
61, Northstar @ AMK, Singapore
569880

• WEC product - Drakoo
– Patented Technology
– Sponsored by Sembcorp and
SPRING Singapore
– Status as of Dec 2011: Sea trial
& testing
– Maximum output 4kW
– Efficiency 65~80%

50

Conclusion

 Wave energy is a continuous, predictable and immerse source of
energy compared to other forms of renewable energy

 Wave energy has immerse potential to provide as much renewable
energy as wind energy

 Wave energy technology is currently at the same stage as that of wind
energy industry 10 years ago

 Increasing fossil fuel prices will drive the growth of wave energy

 Wave energy is expected to become competitive by 2025 with projected
technology improvement and cost reduction

 Singapore could potentially venture into the wave energy market and
become a leader in designing and building WEC systems
51

Are you ready to ride the wave !?

References

• Journal / Conference Articles
– Ted Brekken, “Fundamentals of Ocean Wave Energy Conversion, Modelling and Control”, IEEE International
Symposium on Industrial Electronics (ISIE), 2010, Page(s): 3921 - 3966
– Lagoun, M.S.; Benalia, A.; Benbouzid, M.E.H., “Ocean Wave Converters: State of the Art and Current Status”,
IEEE International Energy Conference and Exhibition (EnergyCon), 2010, Page(s): 636 – 641
– Mohamed, K.H.; Sahoo, N.C.; Ibrahim, T.B., “A Survey of Technologies Used in Wave Energy Conversion
Systems”, International Conference on Energy, Automation, and Signal (ICEAS), 2011, Page(s): 1 – 6
– Kazmierkowski, M.P.; Jasinski, M., “Power electronic grid-interface for renewable ocean wave energy”, 7th
International Conference-Workshop Compatibility and Power Electronics (CPE), 2011, Page(s): 457 – 463
– Sabzehgar, R.; Moallem, M., “A review of ocean wave energy conversion systems”, IEEE Electrical Power &
Energy Conference (EPEC), 2009, Page(s): 1 - 6
– António F. de O. Falcão, “Wave energy utilization: A review of the technologies”, Review Article, Renewable
and Sustainable Energy Reviews, Volume 14, Issue 3, April 2010, Pages 899-918
– AbuBakr S. Bahaj, “Generating electricity from the oceans”, Review Article, Renewable and Sustainable
Energy Reviews, Volume 15, Issue 7, September 2011, Pages 3399-3416
– Drew, B, Plummer, A R, Sahinkaya, M N, “A review of wave energy converter technology”, Proceedings of the
Institution of Mechanical Engineers – A, Volume 23, Issue 8, June 2009, Pages 887 - 902

53

References

• Market Research Report
– Frost & Sullivan, “European Wave Energy Market Assessment”, Published on 12 Jan 2012
– Frost & Sullivan, “Hydro, Wave, and Tidal Power--Market Penetration and Roadmapping (Technical Insights)”,
Published on 30 Mar 2010
– Frost & Sullivan, “An Assessment of Current Technologies in Ocean Energy (Technical Insights)”, Published
on 31 Dec 2008
– Frost & Sullivan, “Marine Energy in Europe”, Published on 23 Jul 2008

• Books
– Joao Cruz, “Ocean Wave Energy: Current Status and Future Perspectives”, SpringerLink 2008
– “Wave energy conversion”, Engineering Committee on Oceanic Resources, Working Group on Wave Energy
Conversion, Elsevier 2003

54

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