Basler Electric DGC-2020 - Manual (Page 341)

settings have been configured and is the last step in setting up a DGC-2020 and
LSM-2020 for load sharing or load control.
The speed controller gains are:
(1) Speed Controller Kp - Proportional Gain
(2) Speed Controller Ki - Integral Gain
(3) Speed Controller Kd - Derivative Gain
(4) Speed Controller Td - Derivative filter time constant
(5) Speed Controller Kg - Loop Gain, must be nonzero for control to occur
vii. Speed Trim Setpoint (Hz) - When speed trim is enabled, the speed trim controller
maintains system speed at the level specified by this setting.
viii. Speed Trim Deadband - When the difference between the measured speed and the
speed trim set point is less than the trim dead band, the speed trim controller will
treat this as zero error. If system operation appears "nervous" when speed trim is
enabled, setting a nonzero dead band may result in smoother system operation. In
addition, if machines do not appear to share kW equally when speed trim is enabled,
setting a nonzero dead band will likely result in improved kW sharing.
ix. Remote Speed Bias - The Remote Speed Bias setting provides for biasing the speed
of a group of generators on a bus, by as much as ±5%, for synchronizing to the
utility. When the Remote Speed Bias setting is configured for the LSM-2020 input or
an AEM-2020 input, the speed trim setpoint is calculated based on the specific
analog input.
x. Remote Speed Bias (%) - The Remote Speed Bias (%) setting corresponds to the
maximum and minimum analog input range.
xi. kW Load Control Enabled - Select Enabled when load sharing and kW control are
required.
xii. kW Controller Gains (Kp, Ki, Kd, Td, Kg) - There are four Proportional - Integral -
Derivative (PID) controllers involved when a DGC-2020 and LSM-2020 are used in a
load sharing or load control system. The gains of the controllers involved with kW
control are discussed below. All controller gains are configured as part of the
controller tuning procedure. The tuning procedures for all PID controllers are
presented in Appendix C, Tuning PID Settings. Controller tuning is performed after all
other settings have been configured and is the last step in setting up a DGC-2020
and LSM-2020 for load sharing or load control.
The kW controller gains are:
(1) kW Controller Kp - Proportional Gain
(2) kW Controller Ki - Integral Gain
(3) kW Controller Kd - Derivative Gain
(4) kW Controller Td - Derivative filter time constant
(5) kW Controller Kg - Loop Gain, must be nonzero for control to occur
xiii. Droop Percentage (%) - This is the percentage of speed droop that is desired when
the DGC-2020 is operating in speed droop mode. Setting this to the default setting of
zero disables speed droop.
xiv. Speed Droop Gain - This gain factor is used to compensate for variations in
governors and their tuning. After controller tuning has occurred, if a nonzero speed
droop percentage is desired, set the value of droop percentage accordingly. Perform
a test by exporting kW, and observe the speed droop. If the observed droop does not
match the Droop Percentage setting, set the droop gain as a scale factor to achieve
the desired droop. For instance, if the observed droop was only half of what is
desired, set the droop gain to two. Then, the observed droop should correspond to
the Droop Percentage Setting.
xv. Ramp Rate (%) - This rate is in terms of percentage of the machine’s Rated kW at
which the generator’s kW output will ramp from 0 kW to the required kW demand
level when the generator breaker is closed and the generator is paralleled to the
9400200990 Rev X DGC-2020 Setup 7-53