Capability Assessment of DTOcean Array Design Tool for Ocean Energy

Authors: Tianna Bloise Thomaz, Leonore van Velzen, Henry Jeffrey, Encarni Medina Lopez and Tom Wills

EWTEC 2019

This project has received funding from the European Union’s Horizon 2020 program under the grant agreement No. 745862

Services:• Techno and Socio-Economic Assessment

• Life Cycle Evaluation

• Array Optimization Analysis

• Technology Roadmaps

• Consultancy

Policy and Innovation GroupUniversity of Edinburgh

Main partners:

Team Leader Henry.Jeffrey@ed.ac.uk

policyandinnovationedinburgh.org

linkedin.com/company/policy-and-innovation-group

UK Ocean Energy Review 2018• Overview of developments in UK wave and tidal sector in 2017 in terms of:

• Key sector achievements• Supporting policies• Research and development• Technology demonstration

Wave and Tidal Energy: The Potential Economic Value• Potential of long-term economic benefits in terms of GVA of the wave and

tidal sectors out to 2050 by exploring an ambitions scenarios.

Policy and Innovation GroupUniversity of Edinburgh

policyandinnovationedinburgh.org

linkedin.com/company/policy-and-innovation-group

Objectives

• Assess DTOcean capabilities• Identified optimal and suboptimal

areas of DTOcean• Provide recommendations for tool

improvement

Objectives and AgendaCapability Assessment of DTOcean Array Design Tool for Ocean Energy

Agenda

• EnFAIT Project• DTOcean tool• Use of DTOcean on EnFAIT• Capability assessment of DTOcean• Conclusions

EnFAITEnabling Future Arrays in Tidal

• European Union Horizon 2020o Coordinated by Nova Innovation, 9 partners, 2017–

2022

• Demonstrate a grid-connected tidal energy array at a real-world tidal energy siteo Deployment of 3-6 turbines, in Shetland, Scotland

Current array layout

Possible future array layout

DTOcean1.0 2016

DTOcean2.0 2019

DTOceanPlus 2020/21

• DTOcean projecto European project FP7 (2013 – 2016)

Led by UEDIN, 18 partners from 11 countries

o Accelerate the industrial development of ocean energy

o Open source numerical tool for array optimisation

• DTOceanPlus projecto Ongoing project (2018 – 2021)o Will develop and demonstrate a 2nd

generation advanced design tool

DTOceanOptimal Design Tools for Ocean Energy Arrays

DTOcean versions

DTOceanArchitecture

User inputs & selections

RESULTSOptimisation

routines

Hydrodynamics ElectricalMoorings & Foundations Installations Operations &

Maintenance

Device

Site

Economics Reliability Environmental

• Array layout• Array orientation• Energy produced

• Electrical layout• Cable installation

technique

• Foundation type• Foundation mass

• Selection of vessel, equipment, port

• Installation plan

• Maintenance strategy• Downtime of devices• Availability

Use of DTOcean on EnFAITHow/why

Final assessmentLarger array

Use of DTOcean on EnFAITPlan

20212018 2019 2020 2022

Initial assessmentArray of 3 devices

Detailed assessmentArray of 6 devices

Sep 2019

Use of DTOcean on EnFAITMethodology

DTOcean results

NOVA design choices

STEP 1 Use of DTOcean

STEP 2Comparison between

results

STEP 3 Identification of areas

DTOcean strengths

DTOcean improvements

DTOcean limited design

choices

Capability AssessmentDTOcean strengths Tidal series

Gravity Foundation

Item DTOcean Existing array Area classification

AEP 102% 100% DTOcean strength

Foundation mass 71% 100% DTOcean strength

• Annual Energy Productiono Importance of AEP for the economic assessmento LCOE sensitive with AEP changeo High accuracy of AEP is extremely important

• Foundation masso Impact on costso Importance of foundation cost on total costso Mass calculation is correctly done by DTOcean specially

considering that no SF were applied by the user on the tool

Capability AssessmentDTOcean improvements

Item DTOcean Existing array Area classification

Offshore substation Yes No DTOcean

improvement

Cable layout One collector One cable per turbine

DTOceanimprovement

By the end of the project: 6 devices

• Substationo DTOcean: one offshore substationo Existing array: no offshore substation

• Export cableo DTOcean: one export cableo Existing array: three export cables (one per device)

Current stage: 3 devices

Capability AssessmentDTOcean limited design choices

Item DTOcean Existing array Area classification

Vessel selection Multiple One Limited design

choice

Preparationtime Cable loading Cable delivered

on reelsLimited design

choice

Existing Array vessel

DTOcean Library• Vessel selection

o DTOcean has a Library with commercial vesselso DTOcean makes a selection of the most cost effective combination of vesselso Nova Innovation designed turbines to be able to use Multicat vessels

• Preparation time for the installation of cableso DTOcean requires a cable loading rate to be considered for the calculation of

the preparation timeo Nova Innovation, considers the cable delivered on reels, negating the load rate

• This work: Identified optimum and suboptimum areas of DTOceanProvided recommendation for DTOceanPlus

• Suboptimum areas of DTOcean: DTOcean optimized for large commercial arraysTidal energy sector: Demonstration stage

• DTOcean (1.0 and 2.0) can be used to: Make strategic predictions for expanding array Assess cost reduction opportunities

• Use of DTOcean on EnFAIT will assist Nova Innovation to find an optimum array designThe sector development with Nova experience/feedback

ConclusionsDTOcean use on EnFAIT

DTOcean (1.0 and 2.0)DTOceanPlus

R&DTRL1-4

PrototypeTRL3-6

DemonstrationTRL5-7

Pre-commercialTRL6-8

Industry Roll-outTRL7-9

• Offsetting of wave and wind resource and resultant economic benefits: GB case study

• S. Pennock, N. Bharathi, D. Crooks, H. Jeffrey, P. Möller• Wednesday 14.20-14.40 : Room Agave

• Progress update on the development and testing of an advanced power take-off for marine energy applications

• S. Robertson, D, Noble, L. Castellini, M. Martini• Wednesday 16.00-16.20 : Room Elettra

• Towards Reliability-Based Geometry Optimization of a Point-Absorber with PTO Reliability Objectives

• C. Clark, A. Garcia-Teruel, B. DuPont and D. Forehand• Thursday 11.20 – 11.40 : Room Elettra

Other EWTEC presentationsPolicy and Innovation Group

Thank you!tbloise@ed.ac.uk

This project has received funding from the European Union’s Horizon 2020 program under the grant agreement No. 745862