Delta RPI Series, Operation And Installation Manual

Page: 37 / 154

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.
U/Un
I
B
/I
n
K factor
K factor
+10 -10
FRT
–
1/2
21. Jun 2010 13:50
Dead band - Vh
K factor
Vdrop
U1
t1
+10 [ ] %
[
[
[
[
2.0
5
20
150
]
]
]
]
%
%
ms
t2
[ 1.5 ] s
Dead band - Vl
-10 [ ] %
a
b
c
d
e
f
a b
c
c
100%
U1
0 t1
Fault occurence
t3
time
U
grid/
U
nom
2
Umin
Udrop
a
disconnect
1 connect
d
f
b
g
FRT
–
2/2
21. Jun 2010 13:50
t3 [ 3.0 ] s
Mode ON [ ]
g
h
Figure 5-22 FRT setting page.
37
Turn on/off PV inverter