Environmental Engineering Reference
In-Depth Information
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
0
0
0.04
0.08
0.12
0.16
0.2
0
0.04
0.08
0.12
0.16
0.2
Time [s]
Time [s]
(a) Frequency tracking
30
30
25
25
20
20
15
15
10
10
5
5
0
0
0
0.04
0.08
0.12
0.16
0.2
0
0.04
0.08
0.12
0.16
0.2
Time [s]
Time [s]
(b) Detection of the voltage amplitude
30
30
15
15
0
0
−15
−15
−30
−30
0
0.04
0.08
0.12
0.16
0.2
0
0.04
0.08
0.12
0.16
0.2
Time [s]
Time [s]
(c) Voltage tracking
10
10
8
8
6
6
4
4
2
2
0
0
0.1
0.12
0.14
0.16
0.18
0.2
0.1
0.12
0.14
0.16
0.18
0.2
Time [s]
Time [s]
(d) THD of
8
8
6
6
4
4
2
2
0
0
0
0.04
0.08
0.12
0.16
0.2
0
0.04
0.08
0.12
0.16
0.2
Time [s]
Time [s]
(e) Phase tracking
Figure 22.11 Tracking the grid voltage: Experimental results with the SOGI-PLL (left column) and
with the STA (right column)
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