Nonlinear Power System Stability Study by Liapunov Function and Zubov´s Method

Although there are many publications on power system stability, the application of Liapunov´s direct method to the study is relatively new. Gless[l] used an energy integral as a Liapunov function to study 1-, 2-, and 3-machine problems. El-Abiad and Nagappan,[2] also based their studies of the transient stability of a multi-machine system with losses on energy concepts.