Delta PhotoVoltaic RPI-C500, Manual

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I
NSTALLATION
G
UIDE
39
I
NSTALLATION
A
CTIVE
/R
EACTIVE
P
OWER
C
ONTROL
A
ND
F
AULT
R
IDE
T
HROUGH

Below the blue line shown in Figure 2.5.1.2-2, there are no requirements saying that
generating plants have to remain connected to the network.
Voltage drops with values above the borderline 1 must not lead to instability or to the
disconnection of the generating plant from the network (TC2007; 3.3.13.5, section 13;
extended to asymmetrical voltage drops).
If the voltage drops at values above the borderline 2 and below the borderline 1, generating
units shall pass through the fault without disconnecting from the network. Feed-in of a short-
circuit current during that time is to be agreed with the network operator. In consultation with
the network operator, it is permissible 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 5-26. Borderlines of the voltage profile of a type-2 generating plant at the
network connection point
RPI-C500 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
U/Un
I
B
/I
n
K factor
K factor
+10 -10
100%
U1
0
t1
t2
Fault occurence
t3
time
U
grid/
U
nom
2 3
4
1
U2
Udrop
Figure 5-27. FRT characteristic