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rohitg93
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Join Date: Jan 2013
Posts: 1

Question on Generator Capacity Curve

01/31/2013 9:10 AM

for a generator capacity curve why there are limits of Qmin and Q max.

what is reason for Qmin and Q max...
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Anonymous Poster #1
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Re: ques on Generator capacity curve

01/31/2013 9:21 AM

Q?...
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7anoter4
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Re: Question on Generator Capacity Curve

01/31/2013 9:54 AM

The maximum reactive power capability corresponds to the maximum reactive power that the generator may produce when operating with a lagging power factor. The minimum reactive power capability corresponds to the maximum reactive power the generator may absorb when operating with a leading power factor.See: http://home.eng.iastate.edu/~jdm/ee553/PowerFlow.pdf

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juleselec
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Re: Question on Generator Capacity Curve

01/31/2013 1:30 PM

There are typically three factors that limit the reactive power capability of a generator, all of which have to do with thermal limits:

  1. Armature heating limit: the armature windings heat up as more Q (and P) flow through it. At some point, there is a safe thermal limit that needs to be respected. If you need more Q, you can get around this by oversizing the armature windings.
  2. Field current limit: same as 1) except for the field winding. The effects of over/under excitation limiters in the voltage regulator will also have an influence.
  3. End-region heating limit: caused by eddy-currents in the stator laminations at the (axial) ends of the generator. Heating effects are worse in the underexcited condition.
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