VAWTs for offshore applications - orbit.dtu.dkorbit.dtu.dk/files/141971694/Wind_Turbine_Loads... · Target: Twin VAWT 2-bladed floating system with active pitch . Fully coupled (wind-waves)

VAWTs for offshore applications

Workshop on VAWTs for offshore applications

UiS Stavanger 14/12 2016

Uwe Schmidt Paulsen, [email protected]

Wind turbine Loads and Control

14 December 2016 DTU Wind Energy, Technical University of Denmark

DTU Wind energy

Resource Assessment Modelling

Meteorology and Remote

Sensing

Integration and Planning

Loads and Control

Fluid Mechanics

Aerodynamic Design

Structures and

Component Design

Test and Measure-

ments

Material Science &

Characterization

Composites & Materials Mechanics

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Offshore wind energy

Siting and integration

Wind turbine technology

Research based consultancy and tests

Education and teaching

14 March 2016


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Resource Assessment Modelling

Microscale modelling

COAWST-WBLM Coupled-Ocean-Atmosphere-Wave-Sediment-Transport – Wave Boundary Layer Model by DTU Wind Energy and DHI

COAWST-WBLM

COAWST-WBLM


COAWST-WBLM

Wind speed at 10 m, 2006-11-01, 4 a

Significant wave height, 2006-11-01, 4

Example of how the modeling system can be used for special case study, here


Turbine response analysis is the key The Wind Turbine Loads and Control section (LAC) focuses on • modeling and analysis of loads and dynamics, • aero-elastic stability • control of wind turbines and wind farms • conceptual design studies LAC implements the research in cooperation with industry and in software tools and in courses

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The aero-elastic code HAWC2

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HAWC2 (Horizontal Axis Wind turbine simulation Code 2nd generation) is a FE-aero-elastic code intended for calculating wind turbine response in time domain.


Wind turbine load & production prediction

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EU INFLOW Project

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[1] http://www.inflow-fp7.eu

Initial design: 3-bladed stall regulated VAWT

Target: Twin VAWT 2-bladed floating system with active pitch

Fully coupled (wind-waves) aeroelastic analysis of the system using HAWC2 code


Airfoil Design tool: AirfoilOpt/AirfoilOpt2 using Xfoil and EllipSys2D

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Risø-A1-18

Risø-P-18

Risø-B1-18

Risø-C2-18


Details from DeepWind project

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Concept components description

14 5 January 2018

1. Darrieus Rotor

2. Spar buoy

3. Pultruded Rotor blades

4. Torque absorption system

5. Mooring line system

Bearing system at 4

PM Generator module

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4

2

5

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Scientific contents DeepWind (2010-2014)

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MARIN,

9. Dissemination of results


1. Baseline 5MW scaled down to 1kW

2. Proof of concept 1kW scaled up to 5MW

Details of the past project

Scaling dimensions with 1:70.71

Scaling masses with 1:353,500

Property Dim Demonstrator 5MW to 1kW Rated power kW 1.000 1.000 Swept area m2 2.55 2.399 Rotor radius m 1.000 0.853 Rotor height m 2.000 2.016 Rotor tube diameter (top) m 0.150 0.0653 Rotor tube diameter (bottom) m 0.150 0.0905 No of blades - 2 2 Blade chord m 0.12 0.071 Solidity - 0.240 0.1653 Floater hull height m 3.000 1.648 Floater hull diameter (max) m 0.400 0.1174 Total height m 5.000 3.670 Rated rotational speed rpm 300 421 Rated wind speed m/s 14 14 Cut in wind speed m/s 4 4 Cut out wind speed m/s 25 25 Blade mass (1 blade) kg 4.55 0.136 Rotor mass kg 8.20 1.003 Floater mass kg 12.30 3.1850 Ballast mass kg - 10.646 Generator mass kg 138.0 0.820 Torque arm mass (1 arm) kg - 0.048 Total floating mass kg 167.6 16.332 Mooring mass (1 chain) kg - 0.308


DeepWind Demonstration-lab & near-to-real testing


Selected Results FVAWTs DeepWind

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Ragni 2014

Tailored Airfoil development


Selected Results FVAWTs DeepWind

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Tip speed ratio

CP

Milano wind tunnel Ø2m rotor(deepwind) upright

SNL Ø2m rotor-free field measurements

Wind turbine effciciency


DTU activities Resources analysis(met-ocean conditions)

Integration of design and simulation tools(loads- turbine response, fused/MDAO

approach)

Detailed design of aerodynamic and mechanical parts(tailored airfoils design)

Benchmarking HAWC2 with high fidelity codes)

Built(prototype)

Testing and results comparison

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Topics to be addressed • How can we achieve better COE and guaranty less costly floating offshore

wind turbines – Systematic survey on high performance airfoils for deep stall – Design of tailored airfoils(target CP≈ 0.4-0.5) – Simple vs pitch control – A robust simple mechanical and electrical design – Demonstrate a robust resource prediction tool for siting

• Demonstration – Adaptions of design for demo – Demonstrate technology with testing at site – How to boost value for money?(fish/marine food farming technology) – Cost study

• Capitalisation of existing knowhow – Integration of electrical and mechanical solutions from DeepWind

Enabling Marine technologies for better food in offshore environment • BG-04-2017: Multi-use of the oceans marine space, offshore and near-

shore: Enabling technologies (H2020-BG-2016-2017) 21

https://ec.europa.eu/research/participants/portal/desktop/en/opportunities/h2020/calls/h2020-bg-2016-2017.html


Challenge BG-04-2017 • Combining several activities such as renewable energy, aquaculture,

maritime transport and related services in the same marine space, including in multi-use platforms, can serve to divide and reduce the costs of offshore operations and the demand on the space needed for different activities. Research on multi-use platforms funded under the FP7 call ‘The Oceans of Tomorrow’ has already provided promising designs, technological solutions and models for combining activities in terms of economic potential and environmental impact. However, before reaching a demonstration pilot stage, further technological research and innovations are needed to reduce risks for operators and investors.

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Documents

VAWTs for offshore applications - orbit.dtu.dkorbit.dtu.dk/files/141971694/Wind_Turbine_Loads... · Target: Twin VAWT 2-bladed floating system with active pitch . Fully coupled (wind-waves)