Environmental Engineering Reference
In-Depth Information
Table 15.2 Wind turbine characteristics
Reference wind turbine
Rated power
5 MW
Number of blades
3
Rotor/hub diameter
126, 3 m
Hub height
90 m
Cut-in, rated, cut-out wind speed
3, 11.4, 25 m/s
Rated generator speed (x
ng
)
1173.7 rpm
Gearbox ratio
97
Fig. 15.3
Sample wind
speed
22
20
18
16
14
0
200
400
600
time (s)
• The roughness factor is set to 0.01 m which corresponds to a terrain type of
open country without significant buildings and vegetation.
It can be seen from Fig.
15.3
that the wind speed covers the full load region
(also called region 3). In particular, note that from 350 to 400 s its value ranges
from the minimum 12.91 m/s up to the maximum of 22.57 m/s.
15.5 Control Strategy
In this section a baseline torque controller and a proposed chattering torque
controller are introduced. As the generator may not be able to supply the desired
electro-mechanic torque depending on the operating conditions, both torque
controllers are saturated to a maximum of 47402.91 Nm and a maximum generator
torque rate saturation of 15000 Nm/s, see [
9
].
15.5.1 Baseline Torque Controller
The torque control and the pitch control, both, will use the generator speed
measurement as input. As proposed by [
9
] to mitigate high-frequency excitation of
