Wind Farm Control

Report
Controller
design
forfor
a wind
farm,
Controller
design
a wind
farm,
considering
bothpower
power
and
load
considering both
and
load
aspects
aspects
Maryam Soleimanzadeh
Maryam Soleimanzadeh
Rafael Wisniewski
Contents:
• Introduction & Overview
• Wind farm control
• Control strategy
• Load
• Power
• Results
Introduction
•Motivation:
• A wind flow model in the form of
•The wind farm controller should
(based on the model):
• Provide power reference for each WT
• Minimize load
Overview
Overview
Overview
Wind Farm Control
• The Wind Farm Controller block controls the power
production of the wind farm by sending out reference
signals to each individual wind turbine.
• Wind turbine controller: responsible to execute the
references sent from the wind farm controller
Wind Farm Configuration
Load Reduction
Structural Loads (dynamic):
• The tower fore-aft motion
• The tower side-to-side
The blade flap motion
Blade edge & Drive train torsion
Reducing the tower fluctuations (fore-aft and side-to-side), will
significantly reduce fatigue loads
Load Reduction
Depending on wind turbines
operating region
Control
Strateg
y
Wind Farm Control
•Farm control Strategy : (Idea from WT control strategy, following figure)
• Below rated wind speed
•Farm
windController
turbines are
to produce
produces:
as much power as possible
• Rotor speed reference
• the pitch angle is kept
signals
almost
constant.
• Above rated wind speed
• wind turbines are to follow
Farm Controller produces:
the power reference signal
• Power reference
• thesignals
rotor speed is kept
almost
constant.
•Pitch
angle reference
Figure:
Bianchi, F. et al. , Wind turbine control systems , 2006
Wind Farm Control
• Below rated Wind speed:
• pitch angle: constant,
• Additional thrust by rotor speed variations: to increase damping
Wind Farm Control
• Below rated Wind speed:
Wind Farm Control
• Below rated Wind speed:
Increasing tower fore-aft damping
Maximize Power
Minimize load
• S.T.
Minimize load
Increasing tower side-to-side damping
x = V (Wind Speed), u= Ct
Wind Farm Control
• Above rated Wind speed:
• Rotor speed: constant,
• Additional thrust by pitch angle variations: to increase damping
Wind Farm Control
• Above rated Wind speed:
Power Reference Determination
Minimize load
• S.T.
Increasing tower
fore-aft damping
Minimize load
Increasing tower
side-to-side damping
x = V (Wind Speed), u= Ct
Wind Farm Control
Optimal control solution for below rated wind speed
Comparison of total produced
power by each WT in low wind
speed, with and without wind
farm controller
Wind Farm Control
Optimal control solution for above rated wind speed
Total power reference for each wind
turbine in high wind speed, with and
without controller. Total demanded
power from the wind farm for both
cases are equal.
Conclusion
• It is founded on the dynamical model of the flow in wind
farms.
• The wind farm controller focuses on optimization of both
power and load simultaneously.
• Determines the reference signals for each individual wind
turbine controller in two scenarios based on low and high
wind speed. In low wind speed, the reference signals for
rotor speed are adjusted. In high wind speed, the power
and pitch reference signals are determined.
But
• It does not consider the interactions between wind
turbine controllers and the farm controller.
Thank you!

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