Environmental Engineering Reference
In-Depth Information
0.2
400
0.1
200
0
0
−0.1
−200
−0.2
−400
0
0.02
0.04
0.06
0.08
0.1
0
0.02
0.04
0.06
0.08
0.1
Time [s]
Time [s]
(a) Shift of the neutral point
(b) Filtered inductor voltage
60
1
i
N
i
L
30
0.5
0
0
−30
−0.5
−60
−1
0
0.02
0.04
0.06
0.08
0.1
0
0.02
0.04
0.06
0.08
0.1
Time [s]
Time [s]
(c) Inductor
and neutral
currents
(d) Filtered capacitor current
Figure 11.11
Simulation results when the main component of the neutral current is 34 A, 150 Hz
peak value of the shift is less than 0
1 V; the inductor current is almost the same as the neutral
current and
i
c
is very small. The neutral leg provides a voltage of about 200 V peak.
.
11.5.3 With a 150 Hz Neutral Current
When the buck converter has a single phase load
R
5mH
and works at 150 Hz, the peak amplitude of the output voltage is about 360 V. This offers a
neutral current of about 34 A peak at 150 Hz. The simulation results are shown in Figure 11.11.
The peak value of the shift is about 0
=
10
in series with an inductor
L
=
1 V; the inductor current is almost the same as the neutral
current and the current
i
c
is very small. The neutral leg provides a voltage of about 300 V
peak.
.
1
50
25
0
0
−1
−25
−2
−50
0
0.02
0.04
0.06
0.08
0.1
0
0.02
0.04
0.06
0.08
0.1
Time [s]
Time [s]
(a) Shift of the neutral point
(b) Filtered inductor voltage
50
1
i
N
i
L
0.5
0
0
−50
−0.5
−100
−1
0
0.02
0.04
0.06
0.08
0.1
0
0.02
0.04
0.06
0.08
0.1
Time [s]
Time [s]
(c) Inductor
and neutral
currents
(d) Filtered capacitor current
Figure 11.12
Simulation results when the main component of the neutral current is 72 A DC
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