Method of static stability dominant identification

Two extreme cases of static stability are voltage and power angle stability. The general analysis only focuses on one the or limit state change studied for a certain kind characteristics. In this paper, limits derived, respectively. Therefore, different characteristics their interrelationships can be further studied. index to judge dominant characteristic is defined. proposed needs system wide-area measurement information quickly accurately instability (DI) in paper equal 1 −1, which help identify whether dominant. effectiveness method proved by simple system.