Identifying and Mitigating Barriers to Using Lidar for Wind Energy Applications

IEA Wind Task 32: Wind Lidar

Andrew CliftonWindForS

Source: U. Stuttgart SWE

Focusses on the use of wind lidar technology for wind energy applications

• Identify and mitigate barriers to deploying wind lidar

• Tangible outcomes such as recommended practices

• 12 countries including AT, CAN, CN, DE, DK, FR, JP, NL, NO, SK, UK, US.

IEA Wind Task 32 2

What is IEA Wind Task 32?IEA Wind is an international framework for collaborative wind energy research

ResearchImplementation Loads &

ControlSite Assessment Power Performance

Complex Flow

Four application areas, each with unique issues

Site Assessment

Lidar systems’ cost, reliability and

accuracy

→ Explore ways to improve

technologies and methods

Power Performance

Gaps in standards and

transferability

→ Explore adaptation of standards

for the use of ground-based lidar

What Are The Barriers To Adoption?

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Four application areas, each with unique issues

Loads and Control

Relationship between lidar &

turbine

→ Develop data processing tools

→ Initiate guidelines

Complex Flow

Limitation of lidar in complex flow,

possibilities of multi-lidar

→ Understand needs and limits of

lidar use in complex flow

What Are The Barriers to Adoption?

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GENERAL MEETINGS WORKSHOPS

• Establish the state of the art in a

particular topic or application

• Identify the barriers to adoption of

lidar for that application

• Work out if those are real

• Suggest a path forward to get

through them

Task 32 Brings Experts Together

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#1: FLOATING LIDAR SYSTEMS

• Led by Julia Gottschall, Fraunhofer IWES

• Hosted by Offshore Renewable Energy

Catapult, Blyth, UK, Feb 2016

Roadmap for the improvement of the

technology’s maturity

#2: OPTIMIZING LIDAR FOR

TURBINE CONTROL

• Led by Eric Simley, Envision Energy

• Combined with ACC, Boston, July 2016

Tutorial on the use of lidar for wind turbine

controls

Workshops So Far

IEA Wind Task 32 6Source: J. Gottschall, IWES Fraunhofer

#3: LIDAR MEASUREMENTS OF

WAKES FOR MODEL VALIDATION

• Collaboration between two IEA Tasks

• Task 31: Javier Sanz Rodrigo, CENER

• Task 32: Davide Trabucchi, U. Oldenburg

Need for guidance in creating, sharing and

analysing lidar measurements for wake studies

#4: POWER PERFORMANCE:

ROUND ROBIN

• Collaboration with Power Curve Working Group

(www.pcwg.org), led by Luke Simmons, DNV-GL

• Identified need for well-defined uncertainty

Round robin results

Workshops So Far

IEA Wind Task 32 7Source: D. Schlipf, U. Stuttgart SWE

#5: USE CASES IN WAKE AND

COMPLEX FLOWS

• Led by Peter Clive, Wood Group.

Hosted by U. Glasgow

• Worked on use cases for lidar

measurements in complex flow

• Investigating uncertainty

estimates

Worked example of use cases

and uncertainty

Workshops So Far

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ResearcherTurbine

manufacturer

Lidar system

manufacturer

End

User

WS01

Floating lidar8 17 7

WS02

Controls19 10 5

WS03

Wake

assessment

41 9 3 11

WS04+RR

Power

performance

18 7 6 24

WS05

Use cases10 3 3 9

„So, what’s the uncertainty of the measurements?

Every end-user of lidar data, ever

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Where Do Lidar Uncertainties Come From?

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DeviceData

analysis

Operating

environment

Line of

sight

velocity

Decisions

Lots of interactions

Lidar measurements do not happen in isolation

Source: PNNL via Flickr

Use Case 2: Profiler in complex flow

Use Case 1: Profiler in uniform flow

• Use case combines…

• Data requirements (WS, WD)

• Situation (simple, complex)

• Methods (profiler)

• Defines a unique situation

• E.g. power performance

measurements in simple flows

(IEC 61400-12-1)

• Allows exchange of ideas

Use Cases

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Device

No sensitivity to location

Reference

Device

Reference

High sensitivity

to location

Use Case 2: Profiler in complex flow

Use Case 1: Profiler in uniform flow• How do we use models to help

interpret our data?

• How do we validate our models?

• What is the uncertainty of the

result?

• How do we modify our methods

for different situations?

• What can we do with lidar, that

we can’t do with other sensors?

Use Cases Help Identify Research Questions

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Device

Reference

Device

Reference

Longer term research directions:

• How do we generalize methods and

results?

• What could we do if we didn’t force

measurements back to a point

comparison?

• How do we make lidar a reliable,

standard tool for wind turbine and

farm control?

What Else Can We Do With Lidar?

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Source: www.pnnl.gov

Next Workshops

Power Performance Measurement Using Nacelle Lidars

• September 2017, DONG Energy, Denmark

• Led by Rozenn Wagner (DTU)Source: R. Wagner, DTU

Practicalities of Using Wind Lidar in Complex Terrain

• November 2017, Stuttgart,Germany

• Led by SWE and WindForS

Source: A. CliftonIEA Wind Task 32 14

Next Workshops

What would you like to see?Loads & Controls

• Certification of Lidar-Assisted

Control Applications

• January 30 & 31 2018, Hamburg,

Germany

• led by Nikolai Hille (DNV GL)

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• Participate in a workshop

• ieawindtask32@ifb.uni-

Stuttgart.de

• www.ieawindtask32.org

• General meeting

• Stuttgart, November 2017

www.ieawindtask32.org

How To Get Involved

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Source: USTUTT-SWE

Let’s Talk!

The IEA Wind TCP agreement, also known as the Implementing Agreement for Co-operation in the Research, Development, and Deployment of Wind

Energy Systems, functions within a framework created by the International Energy Agency (IEA). Views, findings, and publications of IEA Wind do not

necessarily represent the views or policies of the IEA Secretariat or of all its individual member countries.

To find out more, or to get involved:IEAWind.Task32@ifb.uni-stuttgart.dewww.ieawindtask32.org

Andrew Clifton

WindForS

clifton@windfors.dewww.windfors.de

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