Delta RPI-M8 Manual page 31

to shift the borderline 2 if the generating plant's connection concept requires to
do so. Also in consultation with the network operator, a short-time disconnection
from the network is permissible if the generating plant can be resynchronized 2
seconds, at the latest, after the beginning of the short-time disconnection. After
resynchronization, the active power must be increased with a gradient of at least
10% of the nominal capacity per second (TC2007; 3.3.13.5, section 14).
Figure 6-4 Borderlines of the voltage profile of a type-2 generating plant at the network
connection point
RPI-M8/ M10/ M12/ M15/ M15A/ M20/ M20A/ M30 implements the FRT behavior
as the figure below, in area
1. Keep normally operate
2. Feed-in reactive current according to ΔU/Un and K factor
3. Short time disconnect
4. Long time disconnect
I /I
B n
U U
grid/ nom
100%
1
K factor
U2
-10 +10
U/Un
2 3
K factor
U1
4
Udrop
0 t1
t2 t3
time
Fault occurence
Figure 6-5 FRT characteristic
30