A THEORETICAL PROOF OF DEEAC
Xue Yusheng (Nanjing Automation Research Institute)
The dynamic equal area criterion (DEEAC) proved theoretically to be both sufficient and necessary conditions for multimachine system stability in this paper, in a sence of multi- step Taylor expansion' s accuracy. This proof is independent of both swing modes and modeling sophistication. Recent achievements are reported on: (1) Safe filtering of cases with CCTs larger than a predefined threshold; (2) reliably finding a start condition for EEAC under unstable cases where no candidate clusters of small size might lose stability; (3) good results for multi -cluster cases; (4) reliable identification of large errors; (5) reliable identification of multi-swing instability. Two kinds of strategies to incorporate detailed models in DEEAC are also suggested with sound reasoning and successful practice.