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)
f
= 49
.
85
Hz
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]
(b)
f
= 49
.
90
Hz
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]
(c)
f
= 49
.
95
Hz
Figure 5.14
Responses when the grid frequency was below 50 Hz: with the frequency-adaptive mech-
anism (left column) and without the frequency-adaptive mechanism (right column)
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