A piecewise global small-disturbance voltage-stability analysis of structure-preserving power system models

This paper provides a tutorial introduction to the small-disturbance voltage-stability analysis as applied to the structure-preserving power system model. Salient features of this approach are: (1) both dynamic and static models that are relevant to voltage stability are included-in particular, the effect of load dynamics and generator current limits are considered; (2) realistic load increases and a generation sharing scheme with relevant limits are included; and (3) for a given load increase and generation sharing scenario, all possible critical points that may lead to voltage instability are systematically traced and identified.