Environmental Engineering Reference
In-Depth Information
Table 5.1
Modal analysis for the upwind 5 MW wind turbine
Element
Mode
Frequency (Hz)
at 11 m/s
Frequency (Hz)
at 19 m/s
Rotor
In-plane 1st collective
3.68
3.69
In-plane 2st collective
7.85
7.36
Out-of-plane 1st collective
0.73
0.73
Out-of-plane 2nd collective
2.00
2.01
Drive train
Drive train
1.66
1.63
Tower
1st tower side-to-side
0.28
0.28
1st tower fore-aft
0.28
0.28
2nd tower side-to-side
2.85
2.87
2nd tower fore-aft
3.05
3.04
Non-structural
1P
0.2
0.2
3P
0.6
0.6
Bode Diagram: From Collective Pitch (rad) To: Generator Speed (rad/s
)
100
50
0
-50
Wind Speed of 13 m/s
Wind Speed of 19 m/s
Wind
S
p
eed
of 2
5 m
/
s
-100
-150
10
-3
10
-2
10
-1
10
0
10
1
10
2
Frequency (Hz)
Fig. 5.3
Family of linear models for the upwind wind turbine
w
g
T
br
¼
K
opt
ð
5
:
2
Þ
A Drive Train Damping filter (DTD) is essential in the control design of wind
turbines and it has to be firstly designed because the drive train mode is critically
coupled in most control loops. The aim of the DTD is to damp the drive train mode
and it has to be used in all control zones during the power production. The DTD
used in the baseline control strategy for the Upwind model (Eq.
5.3
) consists of
