Aalborg Universitet
Wind Energy Systems and Technologies, Aalborg University
Frigaard, Peter Bak
Publication date:
2007
Document Version
Publisher's PDF, also known as Version of record
Link to publication from Aalborg University
Citation for published version (APA):
Frigaard, P. (2007). Wind Energy Systems and Technologies, Aalborg University. Aalborg: Department of Civil
Engineering, Aalborg University.
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Faculty of Engineering, Science and Medicine - Aalborg University
Wind Energy Systems and Technologies
Aalborg University
Research areas:
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Energy planning
•
Power electronics and power systems
•
Control
•
Blade design – composite materials
•
Aerodynamics and aeroelasticity
•
Structural dynamics
•
Foundation
•
Load and safety
Master and PhD programs in wind energy
Offshore wind
turbine at Aalborg
Østhavn
Faculty of Engineering, Science and Medicine - Aalborg University
Department of Energy Technology
Research Focus in Wind Turbine Systems:
Control System
Rotor
Wind
Energy
Gearbox
Generator
Power
electronics
Mechanical
Energy
Transformer
Grid
Electrical
Energy
Grid Requirements!
Faculty of Engineering, Science and Medicine - Aalborg University
Research Projects
Examples of Project :
•
•
•
•
•
•
•
•
Stability and control of Wind farms in Power Systems
Integration and Control of Wind Farms
in the Danish Electricity System
Offshore Wind Power Grid Connection and Reliability
Operation and control of distribution systems with high
level integration of renewable generation units
Modeling and Control of Grid Converter
Simulation Platform for Wind Turbines
Monitoring and Advanced Control of Three Phase DPGS
Project
Advanced Power Converter for UNIversal and FLEXible
Power Management in Future Electricity Network (EU)
Faculty of Engineering, Science and Medicine - Aalborg University
Simulation Platform
Home Page for Simulation Platform Project:
http://www.iet.aau.dk/Research/spp.htm
Faculty of Engineering, Science and Medicine - Aalborg University
Department of Electronic Systems
- Section for Automation & Control
Current wind energy activities:
•
Industrial study group in model based control of wind
turbines
•
Research in connection with MSc projects
•
Industrial PhD project regarding robust control of wind
turbines
•
Industrial PhD project regarding model predictive
control of wind turbines
Faculty of Engineering, Science and Medicine - Aalborg University
Department of Mechanical Engineering
Wind energy activities:
•
•
Almost exclusively devoted to characterisation,
modelling/analysis, design and optimization of advanced
composite materials and sandwich structures for wind
turbine blades
Several ongoing and recent projects with partners in
wind energy sector (wind turbine blade manufacturers,
material suppliers, research institutions)
Faculty of Engineering, Science and Medicine - Aalborg University
Examples of research projects
“Structural Instability Phenomena in Wind Turbine Blades”
Objectives:
• Characterisation and modelling of
buckling phenomena in wind
turbine blades:
Faculty of Engineering, Science and Medicine - Aalborg University
“Buckling of wind turbine rotor blades: Analysis, design and
experimental validation”
Industrial Ph.D. project with Vestas Wind Systems A/S - 2002-2007
Objectives:
• Development of analysis tools for
the prediction of local buckling.
• Analytical (closed-form) and
numerical methods.
• Verification/validation of analysis
results through comparison with
experimenatal data obtained form
model tests as well as full scale
tests.
• Structural design optimization of
wing/blade.
Faculty of Engineering, Science and Medicine - Aalborg University
9 m test section – 4 pt. bending
Faculty of Engineering, Science and Medicine - Aalborg University
Department of Civil Engineering
Wind energy activities:
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•
•
Loads and safety – risk analysis
Foundation – geotechnics
Wave and current loads - scour
Faculty of Engineering, Science and Medicine - Aalborg University
Load & Safety – Risk analysis
Probabilistic design of wind turbines:
• Reliability & risk analysis of components using probabilistic
methods:
– Blades + hub + tower + foundation
– Gearboxes, generators, …
• Reliability updating using measurements / condition monitoring
• Probabilistic adjustment of safety factors
using test results etc.
Faculty of Engineering, Science and Medicine - Aalborg University
Load & Safety – Risk analysis
Risk-based operation & maintenance of offshore wind turbines:
Key aspects:
• Reliability - Availability
• Maintenance costs
• Energy production (benefits)
Offshore:
• Weather windows
• Availability of transport and equipment
Probabilistic
approach
Probabilistic
approach
Optimal decisions: Minimum total expected costs in lifetime
Experience from RBI for offshore oil & gas structures
Faculty of Engineering, Science and Medicine - Aalborg University
Foundation and Geotechnics
• Soil - Structure interaction of foundations for offshore wind
turbines
• Wind-turbine footings on layered ground
• Verification by tests
– Laboratory model test
– Field trials at reduced scale
– Full-scale tests and measurements
Faculty of Engineering, Science and Medicine - Aalborg University
Foundation and Geotechnics
Soil - Structure interaction of foundations for offshore wind
turbines:
gravity based foundation - bucket foundation - monopile foundation - tripod foundation
Faculty of Engineering, Science and Medicine - Aalborg University
Foundation and Geotechnics
Wind-turbine footings on layered ground:
Faculty of Engineering, Science and Medicine - Aalborg University
Foundation and Geotechnics
Laboratory tests:
Faculty of Engineering, Science and Medicine - Aalborg University
Foundation and Geotechnics
Test site for offshore wind turbine research in Frederikshavn:
Faculty of Engineering, Science and Medicine - Aalborg University
Foundation and Geotechnics
Test site for offshore wind turbine research in Frederikshavn:
Faculty of Engineering, Science and Medicine - Aalborg University
Wave and current loads - Scour
Characterization of the environmental loads related to the offshore
position:
In order to
evaluate the
structure
•Waves; irregular breaking
•Currents; wave generated / tidal
•Loads from wave/current
•Loads from ice
•Erosion holes (Scour)
•Scour protection
Faculty of Engineering, Science and Medicine - Aalborg University
Wave and current loads - scour
Wave Run-up Height (level) of Spray
Slamming forces on Boat Landings
Total Wave Forces on Shaft
Laboratory tests:
Faculty of Engineering, Science and Medicine - Aalborg University
Measurements of Scour hole
in laboratory test
(Pile removed)
Area:1.5 m x 0.93 m
Step:1.5 cm
Time:35 min
Faculty of Engineering, Science and Medicine - Aalborg University
Wave and current loads - scour
Comparative tests with Scour Protection:
Faculty of Engineering, Science and Medicine - Aalborg University
Contacts
Energy: www.iet.aau.dk/
Assoc. Professor John K. Pedersen: jkp@iet.aau.dk
Control: www.control.aau.dk
Professor Jakob Stoustrup: jakob@es.aau.dk
Mechanical: www.ime.auc.dk
Professor Ole Thybo Thomsen: ott@ime.aau.dk
Civil Engineering:
Professor John Dalsgaard Sørensen jds@civil.aau.dk