Direct Calculation of Power System Stability Using the Impedance Matrix

The impedance matrix combined with the Norton equivalent and some loads as fixed impedances serve to reduce the number of buses that must be carried in high-speed computer memory. Noniterative techniques are used to gain speed and a Thevenin equivalent is used to check out-of-step conditions of individual machines. Representations of induction motors, generators (salient and nonsalient), govemors, and regulators are conventional.