Environmental Engineering Reference
In-Depth Information
30
30
u
ref
u
A
u
ref
u
A
15
15
0
0
−15
−15
−30
−30
4
4
e
u
e
u
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 voltage
u
A
, its reference
u
ref
and the voltage tracking error
e
u
4
4
i
ref
i
a
i
ref
i
a
2
2
0
0
−2
−2
−4
−4
2
2
e
i
e
i
1
1
0
0
−1
−1
−2
−2
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]
(b) Grid current
i
a
, its reference
i
ref
and the current tracking error
e
i
9
9
THD of u
A
=1.21%
THD of u
A
=0.97%
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
u
A
9
9
THD of i
a
=2.32%
THD of i
a
=5.24%
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
(d) Spectra of
i
a
Figure 6.12
Experimental results in the grid-connected mode with a balanced linear load: current-
voltage
H
∞
repetitive controller (left column) and PR current-
H
∞
repetitive voltage controller (right
column)
Search WWH ::
Custom Search