Identification of critical load-parameters in power systems using bifurcation analysis

The importance of an uninterrupted electric power service was illustrated in 2003 and 2004 by several outages of electric power systems all over the world. In order to prevent such incidents information about the possible critical parameters are needed. Because of lack of information about this part of the system parameters of the load components are of special interest. Special recently developed tools are capable to analyze parameter influences. Together with test functions they are even capable to identify and classify so called bifurcation. This work presents a systematical analysis of load parameter changes. Points where the system changes its behavior qualitatively (=bifurcations) are identified. Furthermore, their dependence of second or third parameters are analyzed as well. This is illustrated by considering an often-used example: a nine bus power system.