Droop; Load Sharing In Droop - ComAp IG-NT GC Reference Manual

Curr recon level
BO Load shed 3
BO Load shed 2
BO Load shed 1
BI Man load recon

DROOP

The droop regulation of kW/kVAr is the alternative to the isochronous Load Sharing and VAr Sharing. In the
isochronous regulation are all information about the kW/kVAr shared via intercontroller communication line
whereas in droop no intercontroller communication is needed. The droop regulation is based on voltage and
frequency which are measured on the common bus. The requested kW/kVAr are calculated in each
controller from the actual bus voltage and bus frequency. This principle of regulation needs the voltage and
frequency beeing changing within defined limits. Type of regulation depends on settings of setpoint
ProcCrtlMulti: Reg kW/kVAr.
ProcCrtlMulti: Reg kW/kVAr
STD Standard isochronous Load Sharing and VAr Sharing are based on CAN
intercontroller communication.
DROOP Load Sharing and VAr Sharing regulations are based on droop. Requested power of
each gen-set is calculated based on bus voltage and bus frequency.
EMERG DROOP Load Sharing and VAr Sharing regulation are based on standard CAN intercontroller
communication, but can be conditionally switched to droop. All controllers are
continually checking the CAN16/CAN32 register (value in group "Info") to see witch
addresses are they in cooperation (use the LBI EmergDroopEnab to confirm the
supervised constalation of addresses on CAN). In case of lost of any controller from
CAN the regulations are automatically switched to droop (yellow alarm EmergDroop
act appears in alarm list, message EmergDROOPon is writen in history). Load Sharing
and VAr Sharing regulation are switched back to the standard mode 60 s after the
constalation of addresses on CAN returns back to the original state (message
EmergDROOPoff is written in history, alarm EmergDroop act has to be confirmed
manually). The purpose of this function is protection against the cut off the CAN
intercontroller line.

Load Sharing in droop

Characteristics of Load Sharing in droop are given by settings of these parameters:
Sync/load ctrl: Load droop, LdDroopOffset
Load droop
This setpoint defines the slope of the load droop correlation. The slope is set as a
droop of frequency in percentages of the requested frequency (Basic settings:
Nominal freq + Nom frq offset) on the range of the requested power from 0 to 100% of
Basic settings: Nomin power.
LdDroopOffset This setpoint defines the value of requested power on the requested frequency (Basic
settings: Nominal freq + Nom frq offset). Allows to shift the droop correlation line up
or down.
Inteli NT GeCon-MARINE MINT, SW Version 3.2, ©ComAp – July 2015
IGS-NT-GeCon-MARINE-MINT-3.2.PDF
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