Deif PPM 300 - Page 158

Figure 5.4 Static synchronisation principle
Synchronised
L1
L2L3
L1
L2L3
L1
L2L3
L1
L2L3
Connected genset
Synchronising genset
L1
L2L3
Time [s]
20
10
0
L1 (genset) - L1 (busbar) [°]
30
1501 RPM
50.03 Hz
GB
GB
1500 RPM
50.0 Hz
G
G
Rotation (relative)
Rotation (relative)
α
L3
L1
L2
α
L3
L1
L2
α
L3
L1
L2
Phase synchronisation regulation
When static synchronisation starts, the frequency regulation regulates the synchronising genset frequency towards the busbar
frequency.
When the genset-busbar difference is 50 mHz, the phase synchronisation function takes over. The controller now ignores f
set point
.
The controlling parameter for the phase synchronisation regulation is the phase angle difference between the synchronising genset
and the busbar.
Close breaker signal
Breaker > [Breaker] > Control > [*B] Close is activated when phase angle difference between phase L1 of the synchronising
generator and the busbar is within the Phase window (after the Minimum time in phase window timer has run out). The voltage
differences must also be within the configured range (Delta voltage min. and Delta voltage max.). This is shown in the following
drawing. In addition, the frequency differences must be within the configured range (Delta frequency min. and Delta frequency
max.).
The response time of the breaker is not relevant when using static synchronisation, because the slip frequency should be either very
small or zero.
DESIGNER'S HANDBOOK 4189340911K UK Page 158 of 521