If asymmetric Q load sharing is enabled, but equal P load sharing is enabled, there can then be a difference between the power
factors of the generators that supply the highest and lowest reactive power.
Power factor example for asymmetric Q load sharing with equal P load sharing
Three 100 kW gensets use equal P load sharing to supply 180 kW. Each genset supplies 60 kW.
The total system reactive power is 30 kvar. The asymmetric Q load sharing allocates 24 kvar to Genset A, while Genset B
and C share the remaining reactive power load equally, with each genset supplying 3 kvar. The power factor for Genset A
is around 0.93, while the power factor for Genset B and Genset C is around 1.00.
INFO
If you enable asymmetric Q load sharing, you can ensure that the power factor is the same for each genset by enabling
asymmetric P load sharing with the same set points.
Example of asymmetric Q load sharing
For an example of asymmetric Q load sharing, replace kW with kvar in the asymmetric P load sharing example.
More information
See
Asymmetric P load sharing
in this chapter for more information.
INFO
The load-dependent starts and stops (which are based on the power or apparent power load) do not necessarily
correspond to the reactive power (Q) load.
7.6.6 SHAFT generator base load
INFO
A SHAFT generator controller can only be assigned a base load.
The power management system distributes the load to keep the SHAFT generator at the base load set point. The GENSET
controllers share the rest of the load.
Parameters
These parameters are only visible in a SHAFT generator controller.
Configure the following parameter under
Configure > Parameters > Local power management > Shaft generator base load >
Enable
.
Parameter
Range
Default
Notes
Enable SG base
load
Not enabled,
Enabled
Not enabled
Not enabled
: The shaft generator cannot run in long-term parallel with
the gensets.
Enabled
: Base load is active for the SHAFT generator controller. The
GENSET-SHAFT parallel timer protection is disabled.
Configure the following parameter under
Configure > Parameters > Local power management > Shaft generator base load >
Power set point
.
Parameter Range
Default Notes
Set point
10 to 120
%
90 %
The set point for the base load, as a percentage of the shaft generator's nominal power.
DESIGNER'S HANDBOOK 4189340911K UK
Page 257 of 521