Static Synchronisation - Deif Multi-line 2 Designers Reference Handbook

AGC
It is obvious that this type of synchronisation is able to synchronise relatively fast because of the
adjusted minimum and maximum slip frequencies. This actually means that when the unit is aiming
to control the frequency towards its setpoint, then synchronising can still occur as long as the
frequency is within the limits of the slip frequency adjustments.
Dynamic synchronisation is recommended where fast synchronisation is
required, and where the incoming gen-sets are able to take load just after the
breaker has been closed.
In static synchronisation the synchronising gen-set is running very close to the same speed as the
generator on the busbar. The aim is to let them run at exactly the same speed and with the phase
angles between the three-phase system of the generator and the three-phase system of the busbar
matching exactly.
It is not recommended to use the static synchronisation principle when relay
regulation outputs are used. This is due to the slower nature of the regulation
with relay outputs.
The static principle is illustrated below.
Synchronisation principle - static synchronisation
Speed:
1500.3 RPM
50.01 Hertz
Synchronising generator
α α
L1
L1
L3
L3
L2
Angle
L1 /L1
gen bus
[deg]
20°
10°
0°
DEIF A/S

Static synchronisation

Load
GB
α
L1
L1
L3 L3
L2
L2
L2
t [s]
GB
Generator on load
L1 L1
L3 L2 L3 L2 L3
Synchronised
Designer's Reference Handbook
Speed:
1500 RPM
50.00 Hertz
L1 L1
L2 L3 L2
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