Environmental Engineering Reference
In-Depth Information
30
4
u
A
i
A
15
2
0
0
−15
−2
−30
−4
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
Time [s]
Time [s]
(a) Local load voltage
(b) Local load current
60
5
THD of i
A
=53.92%
THD of u
A
=4.35%
4
40
3
2
20
1
0
0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Harmonics order
Harmonics order
(c) Spectra of the local load voltage
(d) Spectra of the local load current
Figure 18.9
Loading performance in the stand-alone mode with a non-linear load
18.5.2.2 With a Non-linear Load
The results are shown in Figure 18.9. Although the load current was extremely distorted with
a THD of 53
.
92%, the output voltage was clean with a THD below 5%.
18.5.2.3 With an Unbalanced Load
The results are shown in Figure 18.10. Although there was no load connected to Phase
B
,the
other two phases worked well. The THD of the output voltage was 0
.
48%.
30
4
u
A
u
B
u
C
i
A
i
B
i
C
15
2
0
0
−15
−2
−30
−4
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
Time [s]
Time [s]
(a) Local load voltages (b) Local load currents
5
5
THD of i
A
=0.47%
THD of u
A
=0.48%
4
4
3
3
2
2
1
1
0
0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Harmonics order
Harmonics order
(c) Spectra of the local load voltage
(d) Spectra of the local load current
Figure 18.10
Loading performance in the stand-alone mode with an unbalanced load
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