Page 194 Commissioning current injection
We take care it.
The small algorithm (Uns, Ici the parameterization) can used for most applications.
13.
Measurement points for the different algorithms:
Measu-
rement
point
Algorithm
Uod,Ici
Algorithm
Uns,Ici
Algorithm Uns,
Uod, Ins, If
Comment
Usync Synchronization voltage
UNS (Une) Zero sequence voltage P-
coil
U0D Zero sequence voltage on
open delta winding (on bus-
bar)
ICI Injection current
I0_S Current through the P-coil
I0_fix Current through addition-
al fixed coil
Note:
The Uns, Uod, Ins, algorithm was initially developed for the ENEL feature together with an
EDC-Sys. The zero
sequence voltage can tapped from the coil (Uns) 'behind' the transformer from the
busbar's open delta winding (specified here Uod) always corresponds the zero se-
quence voltage across the coil. not needed for standard applications.
.
In this case, Uns corresponds Une and also describes the zero sequence voltage.5 Selecting the right measurement points for Uen when inject-
ing current
The algorithm uses the measurement the zero sequence voltage (Uen) and the injected
current Ici calculate the grid parameters
