energy offshore wind farm development in vietnam...2018/01/01 · 1) stemat 79, 2) taklift 7, 3)...

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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…and right from the start involved in Offshore Wind

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DNV GL certified 65% of operating Offshore Wind Projects globally.


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


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


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


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


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


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


Extreme wind speed assessment

Typhoons/Cyclones are tracked by the Japan Meteorological Agency (JMA ) andJoint Typhoon Warning Center , Hawaii (JTWC).

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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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Monopile Jacket Tripod / Tri-pile GravityBase

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What type of foundations are suited for the seabed conditions


Fabrication Limits

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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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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


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


SAFER, SMARTER, GREENER

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are the properties of companies in the Det Norske Veritas group. All rights reserved.

Thank you

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Benoit [email protected]+65 8223 3274

energy offshore wind farm development in vietnam...2018/01/01 · 1) stemat 79, 2) taklift 7, 3)...

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