Environmental Engineering Reference
In-Depth Information
100
100
f g
f g
f
f
80
80
60
60
40
40
20
20
0.2
0.22
0.24
0.26
0.28
0.3
0.2
0.22
0.24
0.26
0.28
0.3
Time [s]
Time [s]
(a) Frequency tracking
50
50
v m
v m
E
E
45
45
40
40
35
35
30
30
0.2
0.22
0.24
0.26
0.28
0.3
0.2
0.22
0.24
0.26
0.28
0.3
Time [s]
Time [s]
(b) Amplitude of the fundamental component
60
60
v−v h
v−v h
e
e
30
30
0
0
−30
−30
−60
−60
0.2
0.22
0.24
0.26
0.28
0.3
0.2
0.22
0.24
0.26
0.28
0.3
Time [s]
Time [s]
(c) Tracking the fundamental component
15
15
10
10
5
5
0
0
0.2
0.22
0.24
0.26
0.28
0.3
0.2
0.22
0.24
0.26
0.28
0.3
Time [s]
(d) THD of the recovered fundamental component e
Time [s]
8
8
v−v h
v−v h
θ
θ
6
6
4
4
2
2
0
0
0.2
0.21
0.22
0.23
0.24
0.25
0.2
0.21
0.22
0.23
0.24
0.25
Time [s]
Time [s]
(e) Phase tracking
Figure 23.4 Extracting the fundamental component from a noisy distorted square wave: Simulation
results with the SLL (left column) and with the SOGI-PLL (right column)
 
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