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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, also based their studies of the transient stability of a multi-machine system with losses on energy concepts.
Date of Publication: Dec. 1967