Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
www.ecn.nl
Integrated Wind Farm Design Flow project P201102_004
Wind Farm Wake Modelling, Fatigue Loads and Control Bernard Bulder ([email protected])
Rotterdam; Windkracht 14 January 23rd 2014
Content
• Introduction integrated design • Optimisation or development of objectives • Project developments • Example
• Pieter Gebraad’s (DUT- DCSC) Presentation on
Controlling the wakes for improved wind farm operation
• Questions
Introduction – What is integrated design or system engineering.
Integrated design in the conventional sense is to bring designers from all disciplines together from the start of the project
Nowadays it translated into coupling of proven design tools of all disciplines to and control the design process through a single interface to determine all factors of an objective function. Benefits are: Cost reductions during the development / faster time to market Higher reliability of the design / less surprises during integration of the
system Ultimately lower cost of energy
WIND FARM INTEGRATED DESIGN
4
Integral optimization Levelised Costs of Energy
Component choice
WF operation
HVac vs. HVdc
grid operation
Optimisation - Cost of Energy
The Cost of Energy is depending on a large number of factors or cost components.
To evaluate the cost function it will be necessary to have (detailed) models of all (most) major costs & benefits (yield)
Some of these aspects are developed or upgraded int this project
Just an example LCOE model, see model of the Crown Estate (UK)
Project developments
The FLOW project has three main research lines: Upgrading and extending the wake modelling o Lot’s of small and larger improvements have been made in the code, especially for the
near wake modelling and atmospheric stability, which is now an input parameter. Developing a fatigue load model to predict the fatigue load influence due
to wind farm operation in relation to the design load o Model has been made, including meandering on the basis of the stochastic wind field
data. Model is being implemented into FarmFlow. Develop control strategies using the yield and load information o Apply ECN’s active wake control to influence the fatigue load and yield in a
demonstration project
Project developments
ECN’s FARMFLOW wake model is validate against full scale measurement of the EWTW , 5 N80 wind turbines of 2,5 MW
The overall wake effects are very well predicted
Example
Wind farm output and wind direction
High variability of power output Low(er) variability of power output
Project developments
Development of Fatigue Load prediction model:
Based on characteristic shape of the wake in front of each wind turbine in the wind farm for all wind speeds and all wind direction the ratio of the fatigue equivalent load is compared to the design loads according to IEC – 61400-1 standard.
Final result: the ratio of the actual fatigue equivalent load over the design fatigue equivalent load (for all load components) investigated.
Due to large amount of calculations use is made of a database method where the calculation are performed on a reference wind turbine
Project developments
Wind Farm control using active wake control: reducing the rotor axial
induction or deviating the wake from
the down stream machine
Results: Lower fatigue loads and; an increase in yield!
Presentation by Pieter Gebraad Controlling the wakes for improved wind
farm operation
Thank you for your attention
This presentation is a cooperation between DUT – DCSC & ECN wind energy.
Questions?
ECN Westerduinweg 3 P.O. Box 1 1755 LE Petten 1755 ZG Petten The Netherlands The Netherlands T +31 88 515 49 49 [email protected] F +31 88 515 44 80 www.ecn.nl