ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...
ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ... ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...
4. MODELING OF PROPOSED DVR Mustafa İNCİ where k affects the bandwidth of the closed-loop system(Ciobotaru et al.,2006). 4.3.1.4. Reference Generation Using Sag Detection Methods Sag detection methods are used to detect balanced/unbalanced sag and swells. Firstly, all voltage signals are converted to per unit values. Magnitude signal (A(t)) is extracted form EPLL, SRF and SOGIPLL. A(t) signal is subtracted from reference signal (1 pu), the voltage sag/swell depth is calculated as shown in Figure 4.14. It shows the structure of sag/swell depth detection method based on EPLL, SRF and SOGIPLL. Figure 4.14. Block diagram of proposed method based on EPLL, SRF and SOGIPLL(Köroğlu,2012) Sag/swell depth is calculated using (4.35): S depth = 1− A( t) (4.46) Figure 4.15 shows a single phase sag condition for three sag detection methods. As shown in figure, voltage sag initiates at 0.3s with a 0.1s duration and %30 sag depth. 69
4. MODELING OF PROPOSED DVR Mustafa İNCİ 10.0 8.0 6.0 4.0 2.0 0.0 -2.0 -4.0 -6.0 -8.0 -10.0 Voltage Sag Vbusbar A Vbusbar B Vbusbar C 0.280 0.300 0.320 0.340 0.360 0.380 0.400 0.420 (a) Voltage Sag Detection Signal(EPLL) Voltage Sag Detection(SRF) Voltage Sag Detection (SOGIPLL) (b) (c) Figure 4.15. (a) Busbar, (b) magnitude(sag depth) and (c) sag detection signals It is shown Figure 4.15, SRF is the best way to detect voltage sag and swell compared to EPLL and SOGIPLL. SRF is more superior than EPLL and SOGIPLL due to its speed and The advantages of SRF are fast and more accurately than EPLL and SOGIPLL. EPLL and SOGIPLL extract phase information which is an advantage compared to SRF. However, It is clear that EPLL and SOGIPLL have more oscillatory than SRF. 70
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4. MODELING <strong>OF</strong> PROPOSED DVR Mustafa İNCİ<br />
10.0<br />
8.0<br />
6.0<br />
4.0<br />
2.0<br />
0.0<br />
-2.0<br />
-4.0<br />
-6.0<br />
-8.0<br />
-10.0<br />
Voltage Sag<br />
Vbusbar A Vbusbar B Vbusbar C<br />
0.280 0.300 0.320 0.340 0.360 0.380 0.400 0.420<br />
(a)<br />
Voltage Sag Detection Signal(EPLL)<br />
Voltage Sag Detection(SRF)<br />
Voltage Sag Detection (SOGIPLL)<br />
(b) (c)<br />
Figure 4.15. (a) Busbar, (b) magnitude(sag depth) and (c) sag detection signals<br />
It is shown Figure 4.15, SRF is the best way to detect voltage sag and swell<br />
compared to EPLL and SOGIPLL. SRF is more superior than EPLL and SOGIPLL<br />
due to its speed and The advantages of SRF are fast and more accurately than EPLL<br />
and SOGIPLL. EPLL and SOGIPLL extract phase information which is an<br />
advantage compared to SRF. However, It is clear that EPLL and SOGIPLL have<br />
more oscillatory than SRF.<br />
70
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