Environmental Engineering Reference
In-Depth Information
400
200
(external) grid
300
150
200
100
micro−grid
100
50
0
0
−100
−50
−200
−100
−300
−150
−400
−200
0.36
0.37
0.38
0.39
0.4
0
0.1
0.2
0.3
0.4
Time (sec)
Time (sec)
(a) Steady-state grid voltages
(b) Transient tracking error
Figure 4.11 Effect of a distorted public grid: the grid voltages and the tracking error
400
400
300
300
200
200
100
100
0
0
−100
−100
−200
−200
−300
−300
−400
−400
0.35
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.35
0.4
0.45
0.5
0.55
0.6
0.65
0.7
Time (sec)
Time (sec)
(b) Microgrid voltage
(a) External grid voltage
8
6
4
2
0
−2
−4
−6
−8
0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8
Time (sec)
(c) Transient tracking error
Figure 4.12 Effect of a shallow sag of 10% in the grid voltage from t = 0 . 4sto t = 0 . 6s
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