Basler Electric DGC-2020 - Manual (Page 344)

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 Var/PF controller gains are:
(1) Var/PF Controller Kp - Proportional Gain
(2) Var/PF Controller Ki - Integral Gain
(3) Var/PF Controller Kd - Derivative Gain
(4) Var/PF Controller Td - Derivative filter time constant
(5) Var/PF Controller Kg - Loop Gain, must be nonzero for control to occur
xiv. Droop Percentage (%) - This setting defines the percentage of voltage droop that is
desired when the DGC-2020 is operating in voltage droop mode. The default setting
of zero effectively disables voltage droop.
xv. Voltage Droop Gain - This gain factor is used to compensate for variations in AVRs
and their tuning. After tuning the controller, if a nonzero voltage droop percentage is
desired, set the value of droop percentage accordingly. Perform a test by exporting
kvar, and observe the voltage 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 what is desired, set the droop gain
to two. Then, the observed droop should correspond to the Droop Percentage
setting.
xvi. Ramp Rate (%) - This rate is in terms of percentage of the machine’s Rated kvar
Capacity (calculated from Rated kW and Rated Power Factor) at which the
generator’s kvar output will ramp from 0 kvar to the required kvar demand level when
the generator breaker is closed and the generator is paralleled to the utility.
Paralleled to utility status is indicated to the DGC-2020 by the parallel to mains
(ParToMains) logic element in BESTlogicPlus Programmable Logic. As an example,
assume the Ramp Rate is set at 10% per second. If the demand is 50% of the
machine’s capacity, and the generator breaker is closed to parallel the generator to
the utility, it will take 5 seconds for the output to come up to the required level. If the
demand is 80 percent, it will take 8 seconds to come up, etc. This is also the rate at
which the machine will ramp down when going off line in a normal machine stop.
xvii. kvar Setpoint (%) - When the kvar controller is in Var Control Mode, this setting
defines the level of the machine’s Rated kvar Capacity (calculated from Rated kW
and Rated Power Factor) that the DGC-2020 will regulate when the generator is
paralleled to the utility as indicated by the parallel to mains (ParToMains) logic
element in BESTlogicPlus Programmable Logic.
xviii. kvar Setpoint Source - The set point for the kvar controller when it is in kvar control
mode can either be the level set in the kvar Setpoint (%) setting, or it can be derived
from an analog input on the LSM-2020, or the AEM-2020 (Analog Expansion
Module). Set this parameter to User Setting or to an available analog input on the
LSM-2020 or AEM-2020 as required for machine implementation.
xix. kvar Analog Max (%) - This setting defines the value of kvar that is requested when
the kvar Setpoint Source is set to an analog input and the input is at its maximum.
This parameter cannot be configured when the kvar Setpoint Source is set for User
Setting.
xx. kvar Analog Min (%) - This setting defines the value of kvar that is requested when
the kvar Setpoint Source is set to an analog input and the input is at its minimum.
This parameter cannot be configured when the kvar Setpoint Source is set for User
Setting.
xxi. PF Setpoint Source - The set point for the kvar controller when it is in power factor
control mode can either be the level set in the PF Setpoint setting, or it can be
derived from an analog input on the LSM-2020, or the AEM-2020 (Analog Expansion
Module). Set this to User Setting or to an available analog input on the LSM-2020 or
AEM-2020 as required for the machine implementation.
7-56 DGC-2020 Setup 9400200990 Rev X