Environmental Engineering Reference
In-Depth Information
Keywords Wind turbine
Robust control
Multivariable control
H
?
control
Load mitigation
Nomenclature
A
n
,B
n
,C
n
,D
n
State space matrices of system n
a
Tfa
Tower top fore-aft acceleration
a
Tss
Tower top side-to-side acceleration
C
Coleman transformation
C
-1
Anti-Coleman transformation
D
ux
Scalar constant in the control x channel
D
ex
Scalar constant in the output x channel
D
dx
Scalar constant in the disturbance x channel
e
wg
Generator speed error
K
opt
Optimum constant in below rated zone
M
oop
Blade root out-of-plane moment
M
flap
Blade root flapwise moment
M
edge
Blade root edgewise moment
M
tilt
Tilt moment in the rotor plane
M
yaw
Yaw moment in the rotor plane
p
Varying parameter
T
Generator torque
T
DTD
Torque contribution from drive train damping filter
T
br
Torque set-point in below rated zone
T
sp
Generator torque set-point
Unc
Uncertainty
w
g
Generator speed
b
sp
Pitch angle set-point
b
col
Collective pitch angle
B
fa
Pitch contribution from tower fore-aft damping filter
b
tilt
Pitch tilt angle in the rotor plane
b
yaw
Pitch yaw angle in the rotor plane
w
Azimuth angle
h
T
Twist angle in the blade root section
5.1 Introduction
The continuous increase of the size of wind turbines, due to the demand of higher
power production installations, has led to new challenges in the design of the
turbines. Moreover, new control strategies are being developed. Today's strategies
trend towards being multivariable and multi-objective, in order to fulfill the
