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5.2.7.5. FRT (Fault ride through)
Some electricity regulations requests that inverter should keep connected
to grid when grid voltage drops suddenly in few seconds. In these areas,
users can enable FRT function and adjust the parameters to meet the
requirement.
FRT – 1/2
a
Dead band - Vh
Dead band - Vl
b
K factor
c
Vdrop
d
t1
e
U1
f
t2
FRT – 2/2
g
t3
h
Mode
21. Jun 2010 13:50
[
+10
] %
[
-10
] %
[
2.0
]
[
5
]
%
[
]
ms
150
%
[
]
20
[
1.5
] s
21. Jun 2010 13:50
[
3.0
] s
b
[
ON
]
f
Udrop
d
Figure 5-22 FRT setting page.
I
/I
B
n
K factor
-10
+10
c
K factor
b
a
U
U
grid/
nom
100%
Umin
1 connect
U1
0
t1
a
Fault occurence
37
Turn on/off PV inverter
c
U/Un
2
disconnect
t3
time
g
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