Danish Near Shore Wind Projects
Workshop 2 April 2013
Electrical benefits
By: Niels H. Jørgensen
SEMCO MARITIME
energy experience
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WIND POWER
strengthening wind power
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Wind Power
• EPC wind power projects
• Yard and production facilities
• Engineering and design
• Work shops and storage
• Electrical infrastructure - BOP
• Electrical and instrumentation
• Consultancy, engineering and
project management
• Products, technologies and
components
• Offshore substation
• Accommodation modules
• Service, maintenance and
modifications of offshore windfarms
• Manpower and Rope Access
− Telecommunication systems
− Automation
− Intelligent network and services
− Fire fighting and Fire protection
− Hydraulic systems
• Installation and commissioning
2000+ dedicated
employees providing
services for the global
energy sector.
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Influencing conditions
• Offshore and nearshore systems
• Distance from shore
• Depth of water
• Substation platform
• Ancillary equipment
• System voltage
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System offshore 1
Shore zone
Nearshore
zone
Offshore zone
(145 kV)
(170 kV)
220/33 kV
400/220 kV
< 10 -15 km
< 70 km AC
> 70 km DC
8 - 10 STRINGS
8 - 10 WTG/ STRING
< 50 MW/ STRING
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System offshore 2
Shore zone
Nearshore
zone
Offshore zone
(145 kV)
(170 kV)
220/33 kV
220 kV
< 10 -15 km
< 70 km AC
> 70 km DC
8 - 10 STRINGS
8 - 10 WTG/ STRING
< 50 MW/ STRING
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System nearshore 1
Shore zone
Nearshore
zone
Offshore zone
400/33 kV
>10 -15 km
8 - 10 STRINGS
8 - 10 WTG/ STRING
< 50 MW/ STRING
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System nearshore 2
Nearshore
zone
Shore zone
Offshore zone
400/33 kV
>10 -15 km
8 - 10 STRINGS
8 - 10 WTG/ STRING
< 50 MW/ STRING
Improved
reliability
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System nearshore 3
Nearshore
zone
Shore zone
Offshore zone
400/66 kV
> 20 - 30 km
8 - 10 STRINGS
8 - 10 WTG/ STRING
> 50 MW/ STRING
Improved
reliability
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Nearshore zone
36 kV nearshore wind farms to be located < 10 to 15 km from shore.
72.5 kV nearshore wind farms to be located < 20 to 30 km from shore.
72.5 kV nearshore wind farms to be located < 10 to 15 km from shore and
each WTG to be doubled in size to approx 5 - 7 MW.
Higher short-circuit levels due to a short distance to the stiff primary grid system.
The offshore transformer platform is eliminated.
No need for helicopters, accommodation platform or hotelship.
Less expensive installation vessels and transportation ships.
Easily accessible O&M.
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Nearshore zone, continued
Shorter foundations and transition pieces.
Less costly installation due to shorter foundations.
Reduced travel time to sites.
Increase in daily production time on site.
Reduced construction time.
Significant increase in underwater diving time without the risk of decompression.
There may be higher environmental requirements (noise levels).
Reduced wind and wind energy content due to higher temperatures.
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Depth of water
Water depths not exceeding 5 metres create huge installation challenges like
too deep water for land-based excavators
too shallow waters for installation vessels
Only small leisure boats are allowed to enter shallow waters - therefore
cables shall be laid directly on the sand bed
cables shall alternatively be flushed into the sand bed
cables are to be conventional land cable types
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Conclusion
• Faster construction and installation
period
• Reduced equipment costs
• Higher reliability
• Reduced O&M costs
• Less tied up capital
• Broader investor interest
• Faster payoff
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www.semcomaritime.com
Dedicated people, exceeding expectations