Page 80 - Modern Control of DC-Based Power Systems
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Small-Signal Analysis of Cascaded Systems 45
Bode plot of T VM
100
Magnitude (dB) –100 0
–200
Frequency (Hz)
0
Phase (deg) –180
–90
–270
10 0 10 2 10 4 10 6
Figure 2.18 Bode plot of the voltage loop gain T VM ðsÞ with Phase Margin 50.4
degrees, Delay Maring 0.000138 s, at f 5 1010 Hz, Closed Loop stable 5 Yes.
Bode plot of G iLd
50
Magnitude (dB) 30
40
20
10
0
Frequency (Hz)
90
Phase (deg) 45 0
–45
–90
10 0 10 1 10 2 10 3 10 4
Figure 2.19 Bode plot of the control-to-inductor current transfer function G i L d sðÞ:
G i L d ð jω c PICM Þ 5 9:4350 (2.83)
arg G i L d ðjω c PICM Þ 52 89:8862 (2.84)
