Since voltage is a local variable, reactive power sharing
makes sense only for generators connected to the same
busbar. Generators connected to different busbars may have
very different reactive power outputs as required to maintain
the voltage they are controlling. Attempting to have all
generators produce equivalent amounts of reactive power will
have very detrimental effects of voltage levels throughout the
plant. The fact that the power factor of GTGs and STGs
connected at different locations in the plant may be very
different has no consequences on system stability or on
correct operation. Systems studies must demonstrate
however, that there are no parts of the power system that lack
reactive power.