The stability and security limits of power systems can be
closely approximated by voltage stability criteria [3]. In almost
all voltage instability incidents, one or more synchronous
generators reached its reactive power limits (Q-limits) [1];
thus, the proper modeling of the reactive power capabilities of
generators is of crucial importance for voltage stability studies.
Various models have been proposed for the representation of
Q-limits of synchronous generators in voltage stability and
market analyses. Therefore, this paper starts with comparing
the results of using these models in the aforementioned studies,
to highlight their shortcomings and advantages.