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DNV GL © 12 March 2019 SAFER, SMARTER, GREENERDNV GL ©
Stefan Söderberg
12 March 2019
ENERGY
Sharing experiences of offshore wind measurements –potential approaches for wind farms in Swedish waters
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Wind power at sea - new needs and opportunities
Stockholm
DNV GL © 12 March 2019
Overview
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• DNV GL’s experience of offshore wind resource assessments
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• What are other markets doing?2
• Potential challenges in Sweden3
• Recommendations for offshore wind measurements Sweden
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DNV GL © 12 March 2019
DNV GL’s experience of offshore wind resource assessments
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DNV GL © 12 March 2019
About us1
The Renewable Energy Analytics
team provides a range of data
analysis services and products
that span the entire wind or
solar project lifecycle. These
services are based on over 30
years’ experience and more than
300 GW of projects. Our
recognised excellence and
independence makes us the
preferred consultancy of many
industry players.
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Our excellence stems from our core beliefs:
DNV GL © 12 March 2019
DNV GL’s experience – offshore wind resource1
UK Offshore IAV Study, 2017DNV GL Mesoscale Validation –Dutch North Sea, 2017
Carbon Trust OWA – updated floating Lidar Roadmap,
2018
Energy yield assessments for over >8GW offshore wind farms
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DNV GL © 12 March 2019
What are other markets doing?
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DNV GL © 12 March 2019
On-site or off-site
Conventional met masts
Typically off-site
Fixed Lidar devices
On-site or off-site
Floating Lidar Systems
Scanning Lidar / Met buoys / Existing measurements etc
Other
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Wind measurement options2
However, some limitations with Lidar
measurements remain.
Floating Lidar reaching higher level of industry acceptance –also significant cost savings.
Fixed platform masts becoming less
common.
DNV GL © 12 March 2019
Floating Lidar Technology2
The Carbon Trust Offshore Wind Accelerator Floating Lidar Roadmap provides guidance for floating LiDAR users, OEMs and other stakeholders
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Baseline:Lidar type considered as proven technology in onshore industry. Complementary use with offshore met mast.
Pre-Commercial:Pilot verification trial for FLS type completed successfully. Limited commercial use.
Commercial:Commercial use in a range of conditions following further successful sea trial and pre-commercial deployments.
• 84 FLS deployments• 13 FLS types• 40 locations • Europe, North America, Taiwan• 7 FLS types have reached Stage 2 maturity
Significant rise in Floating LiDAR System deployments:
DNV GL © 12 March 20199
Available Floating Lidar Systems according to Roadmap maturity2
More information available from Carbon Trust Floating LiDAR Repository available here:
https://www.carbontrust.com/offshore-wind/owa/wakes/
FugroSeawatch
None, yet …
STAGE 1
STAGE 2
STAGE 3
NASS&Wind AKROCEAN EOLFI
FraunhoferIWES
AXYS WindSentinel
EOLOSFLS200
Babcock, Forecast
AXYS FLiDAR4M
DeepCLidar
Baseline:Lidar type considered as proven technology in onshore industry. Complementary use with offshore met mast.
Pre-Commercial:Pilot verification trial for FLS type completed successfully. Limited commercial use.
Commercial:Commercial use in a range of conditions following further successful sea trial and pre-commercial deployments.
DNV GL © 12 March 2019
Developer led
Crown Estate makes wind measurements publicly available after 2 years
UK
Public measurements
Netherlands
Public measurements
Germany
Measurements provided by government
Denmark
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http://marinedataexchange.co.uk/wind-
data.aspx
https://english.rvo.nl/subsidies-
programmes/offshore-wind-energy
https://www.fino-offshore.de/en/index.html
https://ens.dk/sites/ens.dk/files/Globalcooperation/onestopshop_draft_2018_oct.pdf
Other market approaches to wind measurements2
DNV GL © 12 March 201911
Location of publicly available measurements2
DNV GL © 12 March 2019
Challenges for offshore wind measurements in Sweden
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DNV GL © 12 March 2019
Water depths Sea ice
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http://data.bshc.pro/#2/58.6/16.2 https://www.smhi.se/oceanografi/istjanst/havsis_en.php
Sweden - offshore environmental conditions3
Stable atmospheric conditions
~200m
–240m
tip
heig
hts
anticip
ate
d o
ut
to 2
030
DNV GL © 12 March 2019
Associated challenges3
Water depths
▪ Met masts become
prohibitively expensive in
deeper waters
▪ If using floating Lidar
systems, consideration
should be given to how other
necessary site conditions
such as turbulence and
extreme wind speeds will be
measured
Sea ice
▪ Survivability of wind
measurement equipment in
harsh conditions
▪ Availability of data due to icing –
consider regular ongoing checks
of wind measurements and build
in extra redundancy
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Stable atmospheric conditions
▪ Accurately considering impact in wind
flow and wake modelling
▪ With increasing turbine size, complex
wind flow events such as low level jets
become relevant
▪ Highlights importance of suitable high
quality measurements to represent
atmospheric conditions (masts + Lidars)
DNV GL © 12 March 2019
Recommendations for offshore wind measurements in Sweden
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DNV GL © 12 March 201916
Public bodies to undertake wind measurements and make publicly available.
Consider reaching out to owners of existing public available measurements (e.g. FINO-2 in Baltic Sea, Danish measurements in North Sea).
Using existing offshore structures for supplementary measurements.
Consider use of Floating Lidar Systems.
However, with strong recommendation for at least one high quality met mast in Baltic Sea – suggest between Gotland and Stockholm.
Recommendations for future offshore wind measurements in Sweden4
https://www.4coffshore.com/offshorewind/FINO-2
Danish measurements?Install at least one met mast
DNV GL © 12 March 2019
Summary
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DNV GL © 12 March 2019
Recap
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Market overview
• Several markets provide public measurements commissioned by government bodies
• Increasing use of floating Lidar systems
Potential challenges
• Water depth and sea ice considerations – potentially favouring floating Lidar systems
• Stable atmospheric conditions and low level jets with increasing turbine size
Approach for
Sweden
• Recommend making measurements publicly available
• Strongly recommend at least one high quality met mast in north Baltic Sea
• Consider additional floating Lidar deployments to supplement existing publicly available measurements in neighbouring markets
DNV GL © 12 March 2019
SAFER, SMARTER, GREENER
www.dnvgl.com
The trademarks DNV GL®, DNV®, the Horizon Graphic and Det Norske Veritas®
are the properties of companies in the Det Norske Veritas group. All rights reserved.
Thank you for your attention
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Presented by Stefan Söderberg: [email protected]
Prepared by Marie-Anne Cowan: [email protected]
