Environmental Engineering Reference
In-Depth Information
30
30
u
A
u
B
u
C
u
A
u
B
u
C
15
15
0
0
−15
−15
−30
−30
4
4
i
A
i
B
i
C
i
A
i
B
i
C
2
2
0
0
−2
−2
−4
−4
4
4
i
a
i
b
i
c
i
a
i
b
i
c
2
2
0
0
−2
−2
−4
−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 (top), filter inductor currents (middle) and the grid currents (bottom)
9
9
THD of u
A
=1.09%
THD of u
A
=1.00%
8
8
7
7
6
6
5
5
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
(b) Spectra of
u
A
9
9
THD of i
a
=2.36%
THD of i
a
=5.20%
8
8
7
7
6
6
5
5
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
i
a
Figure 6.14
Experimental results in the grid-connected mode with unbalanced loads: current-voltage
H
∞
repetitive controller (left column) and PR current-
H
∞
repetitive voltage controller (right column)
Search WWH ::
Custom Search