Environmental Engineering Reference
In-Depth Information
Fig. 1.16 Active and
reactive power from WF to
PCC for load variation
Active power from W F to PCC(pu)
3.65
3.6
3.55
3.5
3.45
3.4
Reactive power from W F to PCC(pu)
1.2
1
Mode2
0.8
0.6
0.4
0.2
0
M ode1
-0.2
0
-0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Time(sec)
Fig. 1.17 Voltage observed
at the PCC for voltage sag in
the infinite bus
1.16
1.14
Mode2
1.12
1.1
1.08
1.06
1.04
1.02
Mode1
1
0.98
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Time(sec)
1.4.4 Fault-Ride Through Study
A three-phase symmetrical fault was assumed in the middle of TL with wind speed
12 m/s. To emulate this fault scenario, the fault was assumed at t = 0.2 s and was
subsequently cleared at t = 0.36 s by restoring the initial TL impedance. As can
be noted in Fig. 1.19 , the fault resulted in significant voltage swings that can
undesirably interfere with the protection circuitry and possibly trip the WT. From
this point of view, it is desirable to minimize and/or suppress the voltage swings.
During the fault, the voltage drop has been slightly improved in Mode 2. After the
fault was cleared, faster voltage recovery to reach to its predefined voltage at the
 
Search WWH ::




Custom Search