Environmental Engineering Reference
In-Depth Information
100
100
f g
f g
f
f
80
80
60
60
40
40
20
20
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]
(a) Frequency tracking
50
50
v m
v m
E
E
45
45
40
40
35
35
30
30
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]
(b) Amplitude tracking
60
60
30
30
0
0
−30
−30
−60
−60
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]
(c) Recovered voltage
15
15
10
10
5
5
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
θ
v
θ
v
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]
(e) Phase tracking
Figure 22.14 Extracting the fundamental component from a noisy distorted square wave: Experimental
results with the SOGI-PLL (left column) and with the STA (right column)
 
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