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725KW Three DG set Synchronised but DG no-1 power showing
750KW DG n0-2 power showing 500KW DG no-03 showing 500KW.
DG is Shynchronised but why this different power showing?
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Answer Posted / jince
Regarding paralleling DG sets we sticks only on the theoratical conditions of same voltage frequency phase angle and phase sequence. And now a days its easy to achieve using sync relays. Load sharing is the major thing in paralleling the DG sets. Many factors are depending on it
1. Droop of individual DG set must be same
Droop implies both voltage and frequency droop. it is the percentage of noload voltage or frequency. ex. 1% 2% 3% etc. Ex.1% voltage droop of 420V(noload)is 4.2V and it means on full load DG voltage comes down to 415.8V and not any more
Same is the case with frequency droop. All DG's droop must be same
2. On loadsharing we adjust voltage of DG's to met REACTIVE POWER AND SPEED(FREQUENCY) TO SHARE ACTIVE POWER
In order to share the load evenly we must control the voltage and frequency of individual DG's constantly
And it depends on load nature
In my personal experience for resistive loads (lamps)
loadsharing is not required as no variation occurs
For varying loads like lifts motors ac chillers compressssors etc constant loiadsharing is required
For clarification please reply
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