Environmental Engineering Reference
In-Depth Information
10
30
v o
i
20
8
6
10
4
0
−10
2
0
−20
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.9
0.91
0.92
0.93
0.94
0.95
0.96
Time [s]
Time [s]
(a) C-inverter with C o = 4500 μ F
10
30
v o
i
20
8
6
10
0
4
2
−10
−20
0
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.9
0.91
0.92
0.93
0.94
0.95
0.96
Time [s]
Time [s]
(b) C-inverter with C o = 3100 μ F
10
30
v o
i
8
20
10
6
4
0
−10
2
0
−20
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.9
0.91
0.92
0.93
0.94
0.95
0.96
Time [s]
Time [s]
(c) R-inverter with K i =0 . 4
10
30
v o
i
8
20
10
6
4
0
−10
2
0
−20
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.9
0.91
0.92
0.93
0.94
0.95
0.96
Time [s]
Time [s]
(d) L-inverter
Figure 7.10 Experimental results for the case with L = 0 . 25 mH: output voltage and current (left
column) and THD of the output voltage (right column)
7.7 Impact of the Filter Capacitor
It has been demonstrated that the filter capacitor can be regarded as a part of the load instead
of a part of the inverter. The impact of the filter capacitor on the inverter can be analysed as
below. The no-load voltage is
1
sC
1
v o =
Z o ( s ) v r =
sCZ o ( s ) v r
1
1
+
sC +
and the equivalent output impedance after considering the capacitor is
1
sC Z o ( s )
Z o ( s )
Z o ( s )
=
Z o ( s ) =
sCZ o ( s ) .
1
sC +
1
+
 
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