4-46 DGC-2020 BESTCOMSPlus Software 9400200990 Rev I
kW Control - Real Power Control Settings
When enabled
K
, the DGC-2020, used in conjunction with an optional LSM-2020, can accomplish kW
sharing between similarly equipped generators. kW control is disabled when an optional LSM-2020 is not
connected.
kW control is accomplished with a PID controller that controls the speed bias signal from the LSM-2020 to
the speed governor. The controller adjusts the bias output to drive the error between desired kW
generation and measured kW generation to zero.
Settings are provided for proportional gain
L
, integral gain
M
, derivative gain
N
, derivative filter constant
O
,
and loop gain
P
of the PID controller.
The percent speed droop to be used when the unit is in droop mode is determined by the droop
percentage setting
Q
. Speed droop mode is entered any time the generator breaker is open. Speed droop
is also the mode when the generator breaker is closed if kW load sharing is disabled. If it is desired to
disable speed droop, set the droop percentage to 0. The speed droop gain setting
R
determines the gain
factor applied to the speed droop percentage to compensate for governor differences and achieve
desired droop performance. In order to test the operation of droop, the unit must be loaded to full load
and the resulting generator speed should be compared to the desired droop. If it is not possible to load
the unit to full load, the droop test may be performed at partial load. The expected speed is determined by
the following equation.
Expected rpm reduction in droop - (actual load/machine capacity) ∗ (droop percentage/100) ∗ rated
speed.
If the actual rpm drop does not match the expected value, calculate the error by dividing the expected
drop by the actual drop, and putting the result in as the droop gain.
Load rate
S
is defined as the rate, in percentage of machine capacity, at which the machine will ramp up
its real power when loading or coming online. The machine also uses this rate to unload prior to cooling
down. If a machine is the only machine online, ramping will not be in effect.
The base load level setting
T
determines the percent of machine capacity at which the kW controller will
regulate if the generator is paralleled to the utility. If paralleled to the utility, the Parallel to Mains logic
element in BESTlogic+ must be driven by logic or a contact input. If parallel to utility operation is
undertaken and the Parallel to Mains logic element is not implemented, the DGC-2020 will remain in kW
load share and will either move toward operation at 100% of capacity or 0 capacity resulting in damage to
the machine or system.
When the unit unloads, the generator breaker will open when the power generated by the unit falls below
the breaker open setpoint
U
.
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