ON BIFURCATIONS, VOLTAGE COLLAPSE AND LOAD MODELING

This paper discusses the relation between bifurcations and power syste ms stability through a thorough analysis of several examples, to clari fy some ideas regarding the usefulness and limitations of bifurcation theory in network studies and operation, particularly in voltage stabi lity related issues. Different types of load models are used in a samp le system to analyze their effect on system stability and bifurcation. Finally, the Ecuadorian National Interconnected System (SNI in Spanis h) is used to depict and discuss the effect of load modeling in saddle -node bifurcation analysis of real power systems.