Environmental Engineering Reference
In-Depth Information
x
10
4
4.5
D
Below Rated
Transition Zone
Above Rated
4
3.5
C
3
2.5
2
F
G
1.5
1
H
E
0.5
B
A
0
300
400
500
600
700
800
900
1000
1100
1200
Generator Speed (rpm)
Fig. 5.1
Power production curve for upwind wind turbine
6
x
10
6
30
20
4
10
2
0
0
0
5
10
15
20
25
0
5
10
15
20
25
Wind Speed (m/s)
Wind Speed(m/s)
6
x
10
4
1500
4
1000
Below Rated
Above Rated
Transiti
o
n Zone
2
500
0
0
0
5
10
15
20
25
0
5
10
15
20
25
Wind Speed (m/s)
Wind Speed (m/s)
Fig. 5.2
Operating points for the upwind wind turbine
• Generator speed regulation varying the generator torque in AB and CD zones.
• Generator speed regulation varying the collective pitch angle in above rated zone.
• Drive train mode damping varying the generator torque to mitigate loads in the
drive train.
• Tower fore-aft first mode damping varying the collective pitch angle and tower
side-to-side first mode damping varying the generator torque to mitigate loads
in the tower.
