Environmental Engineering Reference
In-Depth Information
Table 10.3
Incidence table for single faults using the DOS
r
f
1
f
2
f
3
r
1
1
0
0
r
2
0
1
0
r
3
0
0
1
10.5.3.3 Simulation Scenario
The performance of the designed FDI system is tested via simulations where
additive sensor faults in the stator currents and voltages, changes in the reference
variables (T
g
and Q
s
) and in the disturbances (X
g
), as well as additive sensor faults
in the rotor currents are carried out. Changes in the reference of the generator
torque T
g
and in the generator speed X
g
are related to changes in the mean wind
speed (V) since the wind-driven DFIG is operating according to its ideal power
curve shown in Fig.
10.6
a. Changes in operating points can also be characterized
in terms of the slip of the DFIG, which is defined as s
¼ð
x
s
n
p
X
g
Þ=
x
s
with n
p
the number of pole pairs of the generator (see Fig.
10.6
b).
For validation purposes, a simulation of the DFIG including parameter varia-
tions, as described in [
15
] is performed. To avoid too lengthy simulations, given
the small step size needed for the numerical resolution of the differential equations
describing the generator dynamics, the variations of the operating point that are
simulated are much faster than the ones expected in a real wind turbine. Indeed, for
a wind turbine the operating point variations depend mainly on the wind speed
variations, that lie in the low frequency range (up to 10 Hz). In addition, according
Table 10.4
Incidence table using GOS
r
f
1
f
2
f
3
f
4
f
5
f
6
r
1,1
0
1
0
0
0
0
r
1,2
0
0
1
0
0
0
r
2,1
1
0
0
0
0
0
r
2,2
0
0
1
0
0
0
r
3,1
1
0
0
0
0
0
r
3,2
0
1
0
0
0
0
r
4,1
0
0
0
0
1
0
r
4,2
0
0
0
0
0
1
r
5,1
0
0
0
1
0
0
r
5,2
0
0
0
0
0
1
r
6,1
0
0
0
1
0
0
r
6,2
0
0
0
0
1
0
