Environmental Engineering Reference
In-Depth Information
15
10
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0
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1400
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Time (s)
Fig. 4.16 System response to a wind rise profile. Gray lines PI controller, black lines H
?
controller
controller, was designed following the guidelines in [
6
,
17
]. Basically, the PI
controller was tuned as in [
6
] after linearizing the wind turbine model at the
operating point
ð
V
;
b
;
X
r
Þ¼ð
11
:
4 m/s
;
0
;
12
:
1 rpm
Þ
. The controller gains were
calculated to achieve appropriate damping (0.7) and natural frequency (0.6 rad/s)
[
17
]. As the controller ensures the desired behavior only at the design operating
point, a pitch-dependent gain is applied to compensate for the nonlinear rotor
torque. This gain is a function of b obtained by fitting the values of k
b
along the
