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DNV GL © 07 June 2018 SAFER, SMARTER, GREENERDNV GL ©
07 June 2018Benoit Nguyen
ENERGY
Offshore Wind Farm development inVietnam
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GWEC Wind Conference in Hanoi
DNV GL © 07 June 2018
DNV GL – 150+ years of legacy
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DNV GL © 07 June 2018
…and right from the start involved in Offshore Wind
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DNV GL certified 65% of operating Offshore Wind Projects globally.
DNV GL © 07 June 2018
What does DNV GL offer?
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Global offshoreexperience•DNV GL involved in 90%global Offshore Windprojects
•Experienced multi-disciplinary team
•Global and Local APACPresence
•Experience from the Field– e.g. Thanet and BWII
Cost and riskreduction•DNV GL Cost ReductionManifesto and ProjectFORCE
•Suit of Industry LeadingDesign Tools Aimed atCost and Risk reduction
•DNV GL Riskmanagement tool
Setting thestandard inoffshore wind•DNV and GL OffshoreWind Design Standards
•DNV GL RenewablesCertification
•DNVGL-ST-0126
Onsite presence•Project Coordinator inClient’s Office
•Fabrication Surveillance
•Offshore Site-repExperience
•DevelopmentManagement Support
DNV GL © 07 June 2018
That’s why we always take a full lifecycle approach to provide thebest informed business decisions
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› Market intelligence
› Strategic advice
› Technology evaluation
› Concept selection
› Measurement
› Resource & energyoptimization
› Project engineeringoptimization
› Operation & maintenanceplanning
› Turbine & supportstructures consulting
› Construction optimization
› Monitoring & marinewarranty
› Project management
› Asset optimization
› Operation &maintenanceoptimization
› Performance &condition monitoring
DNV GL © 07 June 2018
Mesoscale wind resource map of Vietnam
Very large wind speeddifferences along the coast
Uncertainties frommesoscale wind flowmodels remain very large
High uncertainty
Not suitable for projectfinance
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Source: Vietnam Renewable Energy Atlas - ESMAP
DNV GL © 07 June 2018
Managing the risk of wind energy forecast
Robust measurements
- Long enough from reliable hardware and in the right places
Robust analysis / long term prediction
Reliable inputs
Independent verification
.. Quantify the uncertainty!
… Validate the methodology
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There will always be risk – but need to reduce it and understand it
DNV GL © 07 June 2018
Accurate measurements: Onshore/Offshore met mast - LiDAR
High P90/P50 confidence level
– gives banks more confidence to loan
Currently intertidal projects use coastalonshore met masts
– Very high wind speed gradient
– The closer to the tidal zone the better
Vertical LiDAR on offshore platform forintertidal project
– Accurate measurements in benign conditions
Floating LiDAR bring cost-effectivealternative for deep offshore development
– provides on-site data for much lower costscompared to offshore mast
– minimum 15-20 m water depth
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Image source: ECOFYS
DNV GL © 07 June 2018
Gedser200 kW
Bonus300 kW
Vestas V164
9.5 MW
Bonus1000 kW
RePower5 MW
1957, 24 m → 2016, 160 m diameter
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Growth in wind turbine size
DNV GL © 07 June 2018
Extreme wind speed assessment
Typhoons/Cyclones are tracked by the Japan Meteorological Agency (JMA ) andJoint Typhoon Warning Center , Hawaii (JTWC).
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DNV GL © 07 June 2018
Importance of Geophysical and Geotechnical Surveys
Varying and complex nature of the geotechnical material in the APAC region, andthe varying capabilities of the site investigation contractors operating there.
Imperative that a comprehensive and adequately supervised campaign ofgeophysical and geotechnical surveying is undertaken by experienced serviceproviders using appropriate techniques and equipment.
END RESULT = High Resolution Geological Model
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DNV GL © 07 June 2018
Monopile Jacket Tripod / Tri-pile GravityBase
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What type of foundations are suited for the seabed conditions
DNV GL © 07 June 2018
Fabrication Limits
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DNV GL © 07 June 2018
DP2 Heavy-Lift Cargo Vessel
Towed barge with crane Shearleg Crane-barge Semi-submersible/heavy-lift vessel
Leg-stabilised crane vessel Self-Propelled Jack-up1) Stemat 79, 2) Taklift 7, 3) Thialf
4) Jumbo Javelin 5) Sea Energy 6) MPI Resolution
Vessel availability - limiting lift weights
Vessels in Asia-Pacific are likely to need the same weight and under-hook height requirements as European craft for the near future.
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DNV GL © 07 June 2018
Multiple Interfaces – Understand the Connections with Design ElementsPre-FEED, FEED and Financial Investment Decision (FID)
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InstallationMethodology
O&M Strategy
WTG Layout
No of WTGs
WTG Model
Electrical Design
StructuralDesignStrong
ModerateWeak
Reasons for FEED:
Proven method from O&G andOW to reduce cost and risk
Determine the best options fordetailed design
Identify and consider criticalinterfaces
Helps answer the key question:what kind of wind farm is best forthis project?........
Design and Project Optimisation(limited time in detailed design)
Definition of Contracts getwhat you pay for! FEED as a basisfor comparing EPC/ EPCI bids
DNV GL © 07 June 2018
Complexity of Offshore Wind and additional challenges in Vietnam
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+ TYPHOONS
+ TYPHOON INDUCED WAVES
+ WEAK UNDER-CONSOLIDATED SOIL
+ LIQUFACTION+ SEISMIC LOADING
+ LOCAL SUPPLY CHAIN LIMITS SUITABLE TURBINES (IEC Class 2B or 3B)
FABRICATION FACILITIES
INSTALLATION VESSELS
DNV GL © 07 June 2018
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
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Benoit Nguyenbenoit.nguyen@dnvgl.com+65 8223 3274
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