Generator MVAR Capability w.r.t grid reactive power

[constantins]

If a generator is connected to a grid, and the grid is supplying lagging MVAR's (+ve circulating), is it possible to operate the machine at lower excitations and still remain in a safe operating region (as described by generator capability curves) than if the grid were supplying leading MVAR's, i.e. do grid MVAR's add to the reactive power produced by the machine and thus push its operating point towards an over excited state?

Thanking you in advance

Con

 

[peterb]

Check thread238-4843, which discussed this subject at length

 

[jbartos]

Suggestion to the original posting marked by ///\\\:
do grid MVAR's add to the reactive power produced by the machine
///Yes, vectorially or in complex plane.\\ and thus push its operating point towards an over excited state?
///Notice that the generator is underexcited when the terminal current leads the terminal voltage. If you increase the current lead by capacitive load, then the generator current will lead the terminal voltage more, therefore, it will be more underexcited. Check the current "Standard Handbook for Electrical Engineers."\\