This can actually reduce the zero sequence voltage during injection. There are two states that can au-
tomatically improved applying different HPCI measures:
0 Very symmetrical and 'small' grids (grid size capacitive current)
– The measure here would consist automatically adjusting the power (reducing the
injection power). smaller grids, the
HPCI ‘learns’ and reduces the injection power accordingly.Page 227
Commissioning the HPCI
Automatic power adjustment!
The current version the HPCI can adjust the power automatically.
LP
I CI
U1
Une
L2
L1
U2
K1
Figure 158: Switching the injection phase (L1 L2) automatically through relay K1
. The HPCI learns how high the impact and reduces the power
accordingly
0 Overhead transmission grids with higher natural unbalance and therefore higher zero
sequence voltage UNE)
– The measure here could consist switching the phase (L1 L2) that used for in-
jection.
14.
Based the absolute value and phase the natural zero sequence voltage, injecting high-
power current can increase the zero sequence voltage.3. The impact the zero sequence
voltage remains optimal ratio the exact calculation the grid's capacity.1 Automatic power adjustment and phase switching L1-L2
Basically, current injection impacts the zero sequence voltage
