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In order to forecast the unstable modes of an electric power system, a new generator coherency identification approach was proposed by analyzing the state matrix of the system in unstable state. 爲準確預(yù)測系統(tǒng)失穩(wěn)模式，提出了基於系統(tǒng)失穩(wěn)時刻狀態(tài)矩陣分析的同調(diào)識別方法。