×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

REACTIVE DROOP VS. VOLTAGE CONTROL

REACTIVE DROOP VS. VOLTAGE CONTROL

REACTIVE DROOP VS. VOLTAGE CONTROL

(OP)
We have 3 generators rated 30MW running in parallel not connencted to the grid.  They are run in reaactive droop mode and not in speed droop.  What does reactive droop actually mean.  If one generator would trip, the load, both real power and var would increase on the other two generators.  What would happen to the bus voltage and why.  Is it possible for the AVR to adjust the voltage back to the normal level.

RE: REACTIVE DROOP VS. VOLTAGE CONTROL

Reactive droop is a means of ensuring the machines share the reactive load. If all three machines were in voltage control with the same target voltage there would be slight differences between them due to tolerances. The unit which would produce the highest voltage if it were islanded will hog the reactive load when part of a group. Reactive droop causes the AVR to back off the field excitation slightly, shifting the VAr loading in a leading direction.

If one unit were to trip the active and reactive loads will redistribute onto the remaining generators, assuming that they have capacity to accept the additional load. The voltage should recover quickly to nominal level.
 

----------------------------------
  
If we learn from our mistakes I'm getting a great education!

RE: REACTIVE DROOP VS. VOLTAGE CONTROL

Speed droop and reactive droop are not related.
Speed droop is a characteristic of the governor and reactive compensation adjusts the voltage so as to share the reactive current.

Bill
--------------------
"Why not the best?"
Jimmy Carter

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources