Environmental Engineering Reference
In-Depth Information
Table 11.1
Frequency-related parameters
Frequency
Value
fundamental frequency
f
50 Hz
harmonics up to 31st
100
∼
1550 Hz
outer loop frequency
ω
o
10000 rad/s
inner loop frequency
ω
i
10000 rad/s
switching frequency
f
s
10 kHz
11.5.4 With a DC Neutral Current
When the single-phase converter works at 0 Hz with an output voltage of 360 V and the load
is
R
5 mH, the neutral line current is about 72 A. The
simulation results are shown in Figure 11.12. The shift is almost 0 when the neutral current
is stable.
=
5
in series with an inductor
L
=
11.6 Summary
Based on (Zhong
et al.
, 2005a, 2005b), the independently-controlled neutral leg is analysed
in detail in this chapter. A controller is designed with classical control techniques, from which
the inductor and the capacitor can be selected. Simulation results are provided to demonstrate
the control performance.
There are several frequency-related parameters involved, which are summarised in
Table 11.1. If the frequency
ω
o
=
ω
i
=
10000 rad/s leads to instability in real-time implemen-
tation, then it can be reduced.
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