A rigorously quantitative stability assessment method is the prerequisite for optimal stability controls of modem power systems. This method should be able to identify all potentially unstable modes, recognize both dangerous and the safest reloading stratcgy and offer sensitivity information. Besides, it should be general and fast enough for on-line tracking system changes and decision searching. Possibly negative effects on transient stability are uncovered for many kinds of emergency actions, including generator tripping, load shedding and rapidly increasing excitation by using extended equal-area criterion (EEAC). An online pre-analysis-based real-time-matching frarnework using EEAC method is presented.
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