Synchronizing Problem

On the face of it, I would say that having your droop settings at least matched between the two gensets would be key.

I can adjust droop settings on my HVPS's over and over again. When I do them independently to the same calibrated settings, I find that the droop settings are identical. Each power source must know what the other power source is "willing to do".

If one power source takes more of the load, and the other one gives it then you will have an unbalanced condition. The reverse voltage realy settings, however, will fight that, which is the whole idea of the reverse voltage relay...one purpose being to prevent damage to your generator's prime mover.

Hi,

I have gone through similar situation, I am sharing the learings from the Incedent-

1. Droop Setting of Alternators is course setting, where as Sync Setting of Woodward is fine setting.

2. But unfortunitely these two does not work together. The AVR Droops the voltage depending upon the Load on the alternator with the help of Droop CT provided in W Phase of the Alternator, Where as Woodward Governer droops the voltage with the help of Aux Input facility (+/- 5 V DC Signal will be feb by the Governer) of the AVR, the woodward governer send such signal to raise or lower the terminal voltage depending upon the KVAr sharing of the alternators. Hence both can not work together.

3 If opted for Droop Setting then the Woodward governer load sharing should be disabled..

4. you need to set the Droop of All alternators to be sync and the Voltage droop should be set at SAME % for same Load. If first alternators droop is set at 4% at one particular load, the rest all alternators droop needs to be set at same 4% with the SAME Load.

5 If the Droops are not SAME, one alternator will work as Alternator and other will work as Motor and eventually the System will trip on Reverse Power..This you can get from the PF meters of both alternator, one alternator's PF would be leading and another will be lagging.

I think if you follow the procedure correctly, then you will be successful.

If in doubt please call the expert form the OEM, who has supplied you the genset and the sync system.

Regards,