Renewable electricity

1. Reg. No. T16EE010
Vulisi Narendra Kumar
M. Tech
Department of Electrical Engineering
NIT Meghalaya

2. Contents
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1) INTRODUCTION
2) CONSTRUCTION
3) OPERATION
4) KEY FEATURES
5) MAINTENANCE
6) CURRENT MARKET
7) MERITS AND DEMERITS
8) CONCLUSION

3. 1. INTRODUCTION
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 In recent years, there has been an increasing emphasis on
sustainable-energy sources as part of ongoing efforts to
combat climate change.
 The greatest success in the history of sustainable energy is
hydroelectric power, which has been performing reliably for
over 100 years.
TECHNOLOGIES USED IN WAVE ENERGY CONVERSION
(WEC)
• PELAMIS
• WAVE STAR
• WAVE DRAGON
• WAVE ROTOR

4. INTRODUCTION
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• Pelami is derived from pelami
platura.
Fig. 1: Detailed Pelamis wave energy converter structure.
• The Pelamis Wave
Energy Converter
technology uses the
motion of ocean
surface waves to create
electricity as shown in
Fig.1.

5. 2) CONSTRUCTION
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Pelamis P-750 wave energy converter mainly consists of two segments:
• Main tube segment
• Power conversion module
The main tube is a semi submerged articulated cylinder linked by
hinged joints which swings head-on to incident waves as shown in Fig.
2.
Fig. 2: Structure of pelamis main tube segment.

6. 2) CONSTRUCTION
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The power conversion module mainly consists of sway hinged joints,
hydraulic rams, high pressure accumulators, motor/generator set,
main fold, reservoir and heave hinged joint as shown in Fig. 3.
Fig. 3: Construction of power Conversion module.

7. 3) OPERATION
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Fig. 4: Overview of pelamis wave generator.

8. 3) OPERATION
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9. 3) OPERATION
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Fig. 5: Mooring system for ocean power delivery.

10. 4) KEY FEATURES
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● SURVIVABILITY
● HIGHEST SPECIFIC POWER RATING
● POWER LIMITING
● 100% AVAILABLE TECHNOLOGY
● MINIMUM ON-SITE WORK
● POWER CAPTURE EFFICIENCY
● IMPACT ON THE ENVIRONMENT

11. 5) MAINTENANCE
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• The Pelamis is designed with a rapid attachment/detachment
system which allows machines to be towed back to sheltered
water for maintenance.
• The system allows the machine to be connected to its mooring
and electrical system in around 90 minutes and disconnected in
less than 15 minutes.
• This patented system can be operated in a wide range of
weather conditions.

12. 6) CURRENT MARKET
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● Aguçadoura
Under this project, a capacity of 2.25MW were installed
5km off the Atlantic coastline of northern Portugal
● Aegir-Shetland
It is located 1-10km off the west coast of main Shetland,
Scotland. Under this up to 26 Pelamis machines of
capacity 20MW were installed.
● Bernera wave farm
PWP Ltd. is planning to install up to 26 Pelamis
machines of capacity 20MW off the west coast of Great
Bernera, West Isles Scotland.

13. 6) CURRENT MARKET
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14. 7) MERITS AND DEMERITS
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• Robustness & redundancy, fault tolerance.
• Available technology, no prototypes within prototypes .
• Non site specific.
• Hydraulic power take-off system - powerful, efficient &
controllable.
• Problem of Power transmission to shore.
• Noise production at the site.
• Navigation disruptions are possible.

15. 8) CONCLUSION
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Wave energy is not expensive to operate and maintain, no
fuel is needed and no waste is produced. However, it depends on the
intensity of the waves and needs a suitable site where waves are
consistently strong. The infrastructure must be able to withstand very
rough weather.

16. REFERENCES
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1)"Two Major Energy Players Join Forces on Wave Power", New
Energy Focus, 7 April 2011.
2)"Wave power firm Pelamis calls in administrators", 21 November
2014.
3)"Update on EMEC activities, resource description, and
characterisation of wave-induced velocities in a tidal flow" , 3 December
2010.
4) “Wave Energy Scotland Briefing Note”, Available:
http://www.gov.scot/Resource/0048/00483663, [Accessed: 13 November
2016].

17. REFERENCES
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5) "Making Waves", Scottish Government, 7 April 2011.
6)"ScottishPower Renewables Purchase Pelamis Wave Power Device",
Available: http://www.ScottishPowerRenewables.com. [Accessed: 16
June 2010].
7)"ScottishPower Renewables at EMEC", Available:
http://www.pelamiswave.com. [Accessed: 3 March 2013].
8)"Dismantling Pelamis P2 001 in Orkney", Wave Energy Scotland, 15
March 2016.
9)"ScottishPower Renewables To Develop Major Marine Power Sites In
The Pentland Firth", ScottishPower Renewables, 7 April 2011.
10)"Development History", Pelamis Wave Power, 29 June 2012.
11)"Wave energy contract goes abroad", BBC Scotland, 19 May 2005.

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