ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...
ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ... ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...
5. SIMULATION RESULTS AND CASE STUDIES Mustafa İNCİ Table 5.7. Sag inception and finish time for three methods Voltage Sag (Phase A) Inception Finish Result EPLL 0.3028 s 0.4046 s Medium SRF 0.3012 s 0.4019 s Fast SogiPLL 0.3039 s 0.4055 s Slow It is shown Table 5.7, SRF is the best way to detect voltage sag and swell compared to EPLL and SOGIPLL. Although EPLL and SogiPLL extract the phase information compared to SRF, SRF is more superior than EPLL and SOGIPLL due to its speed and accuracy. However, It is clear that EPLL and SOGIPLL have more oscillatory than SRF as shown in Figure 5.2 (c). Figure 5.3 and Figure 5.4 show injected voltages and load-side voltages by using three sag detection methods. Figure 5.3. Injected voltages by using three sag detection methods 87
5. SIMULATION RESULTS AND CASE STUDIES Mustafa İNCİ y y y 12.0 9.0 6.0 3.0 0.0 -3.0 -6.0 -9.0 -12.0 12.0 9.0 6.0 3.0 0.0 -3.0 -6.0 -9.0 -12.0 12.0 9.0 6.0 3.0 0.0 -3.0 -6.0 -9.0 -12.0 DVR : Graphs Vload_A_DQ Vload_B_DQ Vload_C_DQ Vload_A_DQ Vload_B_DQ Vload_C_DQ Vload_A_DQ Vload_B_DQ Vload_C_DQ 0.260 0.280 0.300 0.320 0.340 0.360 0.380 0.400 0.420 0.440 ... ... ... Figure 5.4. Source side voltages by using EPLL, SRF and SogiPLL methods 5.2. Simulation Results for Open Loop and Closed Loop Weather (lightning, wind, ice), animal contact, contamination of insulators, construction accidents, motor vehicle accidents, falling or contact with tree limbs can result in voltage sags. Such faults may be 3-phase, line-to-line, or single line-toground. The 3-phase faults are the most severe, but are relatively unusual(Bingham, 1998). In proposed DVR, the voltage sags with 12◦ phase jump have been generated by controlled short circuit impedance in the grid. 5.2.1. Open Loop Voltage Control Method Three case studies (Case 1, Case2 and Case 3) are presented for the following sag types using open loop control method: 88
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5. SIMULATION RESULTS <strong>AND</strong> CASE STUDIES Mustafa İNCİ<br />
y<br />
y<br />
y<br />
12.0<br />
9.0<br />
6.0<br />
3.0<br />
0.0<br />
-3.0<br />
-6.0<br />
-9.0<br />
-12.0<br />
12.0<br />
9.0<br />
6.0<br />
3.0<br />
0.0<br />
-3.0<br />
-6.0<br />
-9.0<br />
-12.0<br />
12.0<br />
9.0<br />
6.0<br />
3.0<br />
0.0<br />
-3.0<br />
-6.0<br />
-9.0<br />
-12.0<br />
DVR : Graphs<br />
Vload_A_DQ Vload_B_DQ Vload_C_DQ<br />
Vload_A_DQ Vload_B_DQ Vload_C_DQ<br />
Vload_A_DQ Vload_B_DQ Vload_C_DQ<br />
0.260 0.280 0.300 0.320 0.340 0.360 0.380 0.400 0.420 0.440 ...<br />
...<br />
...<br />
Figure 5.4. Source side voltages by using EPLL, SRF and SogiPLL methods<br />
5.2. Simulation Results for Open Loop and Closed Loop<br />
Weather (lightning, wind, ice), animal contact, contamination of insulators,<br />
construction accidents, motor vehicle accidents, falling or contact with tree limbs can<br />
result in voltage sags. Such faults may be 3-phase, line-to-line, or single line-toground.<br />
The 3-phase faults are the most severe, but are relatively unusual(Bingham,<br />
1998). In proposed DVR, the voltage sags with 12◦ phase jump have been generated<br />
by controlled short circuit impedance in the grid.<br />
5.2.1. Open Loop Voltage Control Method<br />
Three case studies (Case 1, Case2 and Case 3) are presented for the following<br />
sag types using open loop control method:<br />
88
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