Environmental Engineering Reference
In-Depth Information
40
40
20
20
0
0
−20
−20
−40
−40
4.73
4.77
4.81
4.85
4.89
4.93
4.73
4.77
4.81
4.85
4.89
4.93
Time [s]
Time [s]
(a) Input signal
70
70
60
60
50
50
40
40
30
30
4.73
4.77
4.81
4.85
4.89
4.93
4.73
4.77
4.81
4.85
4.89
4.93
Time [s]
Time [s]
(b) Frequency tracking
40
40
20
20
0
0
−20
−20
−40
−40
4.73
4.77
4.81
4.85
4.89
4.93
4.73
4.77
4.81
4.85
4.89
4.93
Time [s]
Time [s]
(c) Recovered voltage
8
8
6
6
4
4
2
2
0
0
4.73
4.77
4.81
4.85
4.89
4.93
4.73
4.77
4.81
4.85
4.89
4.93
Time [s]
Time [s]
(d) Phase tracking
Figure 23.7 Tracking a distorted noisy signal with a variable frequency when the frequency jumped
from 40 Hz to 50 Hz: Experimental results with the SLL (left column) and with the SOGI-PLL (right
column)
23.9 Summary
Based on (Zhong and Nguyen 2012), a sinusoid-locked loop is discussed in this chapter to track
the fundamental component of a periodic signal following the idea of synchronverters (Zhong
and Weiss 2011). The underlying principle is that a grid-connected synchronous machine that
does not exchange any power with the grid generates the same voltage as the grid voltage. Both
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