integrated simulation challenges with the deepwind floating vertical axis wind turbine … ·...
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Integrated simulation challenges with the DeepWind floating vertical axis wind turbine concept D. Verelst, H.A. Madsen, M. Borg, U.S. Paulsen, H.G. Svendsen, P.A. Berthelsen 12th Deep Sea Offshore Wind R&D Conference EERA DeepWind’2015
DTU Wind Energy, Technical University of Denmark
Outline • Context • Simulation tool • Design Approach • Integrated Simulation Challenges • Future Design Cycles • Conclusions
2 04 February 2015
DTU Wind Energy, Technical University of Denmark
Context
3 04 February 2015
Need to lower the cost of offshore wind energy
Novel Designs
Challenges for current simulation tools
DTU Wind Energy, Technical University of Denmark
Simulation Tool
4 04 February 2015
Aerodynamics
Hydrodynamics
Mooring dynamics Structural dynamics
Controller-generator dynamics
HAWC2
DTU Wind Energy, Technical University of Denmark
Simulation Tool
5 04 February 2015
Aerodynamics
Hydrodynamics
Mooring dynamics Structural dynamics
Controller-generator dynamics
HAWC2
DTU Wind Energy, Technical University of Denmark
Design Approach
DeepWind floating vertical axis wind turbine concept
Rotor & tower
Floating support
structure & mooring system
Generator & electrical system
Turbine controller
6 04 February 2015
DTU Wind Energy, Technical University of Denmark
Integrated Simulation Challenges Overview
Simultaneous development of design & design tool
↓ New tool capabilities, design changes, improved reference data
↓ Challenging design environment
↓ Issues with integrated simulation instabilities
7 04 February 2015
DTU Wind Energy, Technical University of Denmark
Integrated Simulation Challenges Stable operation – U=8m/s
8 04 February 2015
Torq
ue
Gen
erat
or
hous
ing
yaw
DTU Wind Energy, Technical University of Denmark
Integrated Simulation Challenges Stable operation – U=8m/s
9 04 February 2015
Flap
wis
e de
fln.
Edge
wis
e de
fln.
Blade mid-point
DTU Wind Energy, Technical University of Denmark
Integrated Simulation Challenges Blade Instabilities
• Very large 2p load fluctuations. • Stall controlled rotor → low, possibly negative blade edgewise damping
10 04 February 2015
DTU Wind Energy, Technical University of Denmark
Integrated Simulation Challenges Blade Instabilities
11 04 February 2015
DTU Wind Energy, Technical University of Denmark
Integrated Simulation Challenges Controller/Drivetrain Instabilities
• Conventional PI controller with gain scheduler • Simplified aerodynamic load model
12 04 February 2015
DTU Wind Energy, Technical University of Denmark
Future Design Cycles
Need to increase design iterations within limited timescale
↓ Multi-Discipinary Design, Analysis & Optimization
(MDAO)
↓ Integration of design and simulation tools
e.g. OpenMDAO, FUSED-wind
13 04 February 2015
DTU Wind Energy, Technical University of Denmark
Single Environment
Future Design Cycles
14 04 February 2015
Create simplified subsystem models
Integrate simplifiied models into system
model
Use simplified system model in an optimization context
Translate simplified model into a
complex model
Stability anaylsis: Linearize complex
model around operating points
Use complex model for further
optimisation
DTU Wind Energy, Technical University of Denmark
Conclusions • Design tool that integrates all phenomena taking place
• Independent subsystem design approach
• Simulation challenges when integrating subsystems
• Improve future design cycles
15 04 February 2015
Need for efficient integrated simulation tools and MDAO
DTU Wind Energy, Technical University of Denmark
Acknowledgements
16 10 February 2015
The work is a result of the contributions within the DeepWind project which is supported by the European Commission, Grant 256769 FP7 Energy 2010- Future emerging technologies, and by the DeepWind beneficiaries:
DTU(DK), AAU(DK), TUDELFT(NL), TUTRENTO(I), DHI(DK), SINTEF(N), MARINTEK(N), MARIN(NL), NREL(USA), STATOIL(N), VESTAS(DK) and NENUPHAR(F).
This project has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grant agreement No 256769
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