Today is...
Friday, October 20, 2017
Welcome to Control.com, the global online
community of automation professionals.
Featured Video...
Featured Video
EtherCAT with CTC’s master lets your multivendor network play well together...
Our Advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive
Generator Voltage Regulation
Unstable voltage regulation at high load and unity PF

I have noticed on several of our generators that when we are operating at full load and trying to stay near unity power factor there is a significant change in the amount of VARS we see from the generator. We might fluctuate from -8 MVAR to +8 MVAR. However if we try and regulate at 20 MVARs we won't se more that 1-2 MVAR variations. Has anyone else noticed this kind of performance or have a possible explanation?

Thanks,
BCD

1 out of 1 members thought this post was helpful...

BCD,

Are the generators connected to the same bus? Does each generator have its own step-up transformer before the common bus?

When did the problem start? After some planned (or unplanned) outage? After a lightning strike?

Is the grid frequency stable when these problems are occurring?

Is the grid voltage stable when these problems are occurring?

There's really a lot of information we would need to be able to provide any meaningful suggestions or advice.