Control and simulation of doubly-fed Control and simulation of doubly-fed induction generator for variable-speed induction generator for variable-speed wind turbine systems based on an wind turbine systems based on an integrated Finite Element approach integrated Finite Element approach Qiong-zhong Chen*, Michel Defourny Qiong-zhong Chen*, Michel Defourny # , Olivier , Olivier Brüls* Brüls* *Department of Aerospace and Mechanical Engineering (LTAS), University of Liège, Belgium # SAMTECH Headquarters, Liège, Belgium EWEA 2011, Brussels, Belgium
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Qiong-zhong Chen*, Michel Defourny # , Olivier Brüls*
Control and simulation of doubly-fed induction generator for variable-speed wind turbine systems based on an integrated Finite Element approach. Qiong-zhong Chen*, Michel Defourny # , Olivier Brüls* *Department of Aerospace and Mechanical Engineering (LTAS), University of Liège, Belgium - PowerPoint PPT Presentation
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Control and simulation of doubly-fed induction generator Control and simulation of doubly-fed induction generator for variable-speed wind turbine systems based on an for variable-speed wind turbine systems based on an
integrated Finite Element approachintegrated Finite Element approach
Qiong-zhong Chen*, Michel DefournyQiong-zhong Chen*, Michel Defourny##, Olivier Brüls*, Olivier Brüls*
*Department of Aerospace and Mechanical Engineering (LTAS), University of Liège, Belgium
# SAMTECH Headquarters, Liège, Belgium
EWEA 2011, Brussels, Belgium
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OutlineOutline
Background
Control of DFIG
Integrated simulation approach
Examples & validation
Conclusions
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BackgroundBackground
Wind turbine concepts
Evolution of WT size:
Increased flexibility Increased coupling effects
(Data source: A. Perdala, dynamic models of wind turbines, PhD thesis, 2008)
WT types Gen. types
DFIG WTs DFIG
FSWTs SCIG
FCWTs PMSG, SCIG etc.
Other OSIG
Equipped gen. types
(Figure from EWEA factsheets)
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BackgroundBackground
Computer-aided analysis for WT systems Software specialized in a certain field
Aerodynamics: AeroDyn etc. Structure: ADAMS/WT etc. Electrics: DIgSILENT etc.? Different systems on different simulation platforms?? No detailed coupling analysis
Integrated simulation packages: GH Bladed, Simpack Wind, HAWC2, FAST etc.
? Weak coupling (DLLs or co-simulation) ?? Numerical stability?
Need for integrated optimization tools (Bottasso, 2010)
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BackgroundBackground
Samcef for Wind Turbine (S4WT) Nonlinear FE flexible multibody solver: SAMCEF/MECANO One single platform:
Aeroelastics, multibody, control, electrodynamics etc. Flexibility in blades, shafts, tower etc. Simulation approaches: Weak & strong coupling
An integrated model on S4WT(Courtesy: Samtech)
…
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Highlights of the paperHighlights of the paper
Improved control strategies of DFIG WTs Grid-synchronization Power optimization
Strongly-coupled approach for mechatronic systems [B. & Golinval 2006]
Integrated structure-control-generator analysis on S4WT
Brüls, O. and Golinval, J. C. The generalized-α method in mechatronic applications. Zeitschrift für angewandte mathematik und mechanik (ZAMM) 86, 10 (2006), 748-758.
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Control of DFIGControl of DFIG
Working process of WT systems
Control of DFIG: soft grid connection power optimization
Gear box
Grid
AC/ DC
DC/ AC
SWs
SWg SWr
Transformer
DFIG
RSC GSC
Wind turbine
A schematic configuration of a DFIG wind turbine
E
A B
C
D
Power Optimization
Power Limitation
Win
d p
ow
er
Wind speed
0
Tu
rbin
e o
utp
ut
pow
er
Rotor speed
0 A
B
C
D, E Power Optimization
Power Limitation
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Grid synchronization controlGrid synchronization control
Strongly-coupled representation for mechatronic systems
Extended generalized-α solver Coupled 1st / 2nd order systems Second order accuracy Unconditional stability More details can be referred to [B. & Golinval 2006]
qMq Φ ( λ Φ) g(q,q, ) L y 0
Φ(q) 0
x f (q,q,q,λ, x, y, ) 0
y h(q,q,q,λ, x, y, ) 0
T ak p t
k
t
t
Mechanism
Control system
y ( , , , )q q q
Coupling in a mechatronic system
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Mechatronic Modelling on SAMCEFMechatronic Modelling on SAMCEF
Considerations for the Mechatronic modelling: Functional system decomposition Modularized, parameterized components
E.g. DFIG, PI, PID modules etc. Nodes are introduced for