D-500 MK2 User Manual Firmware V-6.3
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The Distributed Power Export to Mains mode allows an unlimited number of gensets to export power
to the mains and share active and reactive loads without any communication between controllers.
The application of this feature is large independent areas, relying only on generators for power
generation. Gensets are distributed to the area, making any communication between controllers
impossible. Thus each controller has to determine the required power to export independently from other
controllers.
OPERATING PRINCIPLE:
When required to run, each generator is synchronized and closed to the mains independently. Usually
generators are run and stopped manually by staff charged of power generation. The energy request will
depend of the time of the day, thus the required number of gensets will vary.
The operating principle is based on the precise measurement of the mains frequency by the controllers.
When the frequency is below the nominal value, this means a need for extra power, and each controller
will slowly ramp-up the exported power. When the frequency is above the nominal value, this shows an
excess of power export, thus each controller will ramp-down its export power. For stability reasons a
frequency band of no-action is also defined.
The reactive power export is controlled by the grid voltage. The controller tends to maintain the mains
voltage at its nominal value, resulting in the production of the exact amount of reactive power requested
by the load.
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