Digital Load Sharing (Datalink) - Datakom D-500 MK2 User Manual

D-500 MK2 User Manual
Load sharing may be performed in 3 different ways:
•
Digital load share, based on Datalink communication
•
Active power sharing based on the Analog Load Share Line
•
Uncontrolled load share, based on droop operation

30.1. DIGITAL LOAD SHARING (DATALINK)

The Datalink is an isolated Canbus line where all controllers communicate between them. The default
Datalink bit speed is factory set to 250kbps. However speeds from 50kbps to 500kbps may be manually
selected.
All units on the same Datalink bus must operate with the same bit
speed.
The Datalink is the best performing way of load sharing. All controllers will broadcast all their power
parameters and both active and reactive powers will be shared.
The load sharing display of each unit will show precisely the total system power loading and the individual
genset power loading.
Based on the total power demand and own parameter setting, each genset will decide when to run.
When a genset decides to run, it will synchronize to the busbar, close its genset contactor and ramp-up
until reaching the necessary power rate.
When a genset decides to stop, it will ramp-down, then open its genset contactor, then cooldown and
stop.
The load sharing takes into account the genset nominal power settings. Gensets of various power ratings
may be used in parallel. Each genset will be loaded with the same percentage of its nominal power.
Parameters used in the load sharing: (detailed descriptions are in the programming section)
Genset Active Power Rate
Genset Reactive Power Rate
Genset Number in Multi Genset Systems
Minimum Genset Fault Action
Multi Genset Start-Up Options
Multi Genset Start-Up Power
Insufficient Multi Genset Start-Up Power Alarm
Level
System Reserve Power
Load Management Method
Governor Droop Enable
Governor Output Droop
AVR Droop Enable
AVR Output Droop
Dwell Timeout
Active Power Ramp (kW/sec)
Reactive Power Ramp (kVAr/sec)
Ramp On High Limit
Ramp Off Low Limit
Active Power Share G Gain
Reactive Power Share G Gain
Nominal Frequency G Gain
Nominal Voltage G Gain
Multi Genset Delayed Start
Multi Genset Quick Start
Multi Genset Delayed Stop
Multi Genset Run/Stop Delay
Load Management Inhibit Delay
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Firmware V-6.3