Environmental Engineering Reference
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− − − − 4
− − − − 4
Q 1
Q 2
Q 1
Q 2
0
1
2
3
4
5
6
7
8
9
10 11 12
0
1
2
3
4
5
6
7
8
9
10 11 12
Time [s]
Time [s]
(a) Reactive power
1 1 2 2 28
1 1 2 2 28
P 1
P 2
P 1
P 2
8
8
0
1
2
3
4
5
6
7
8
9
10 11 12
0
1
2
3
4
5
6
7
8
9
10 11 12
Time [s]
Time [s]
(b) Real power
50.8
50.8
f 1
f 2
f 1
f 2
50.6
50.6
50.4
50.4
50.2
50.2
50
50
49.8
49.8
0
1
2
3
4
5
6
7
8
9
10 11 12
0
1
2
3
4
5
6
7
8
9
10 11 12
Time [s]
Time [s]
(c) Frequency
16
16
12
12
8
8
4
4
0
0
0
1
2
3
4
5
6
7
8
9
10 11 12
0
1
2
3
4
5
6
7
8
9
10 11 12
Time [s]
Time [s]
(d) RMS value of the output voltage
1 1 2 24
1 1 2 24
8
8
0
1
2
3
4
5
6
7
8
9
10 11 12
0
1
2
3
4
5
6
7
8
9
10 11 12
Time [s]
Time [s]
(e) THD of the output voltage
Figure 21.8 Experimental results (I): without the harmonic droop controller (left column) and with a
3rd and 5th harmonics droop controller (right column)
 
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