| A kind of security and stability control model based on on-line Predictability is presented in this article, according to the increasingly complicated structure and the imperative problem in the process of safe and steady operation of power system. The model is given out after having studied the existing measure of secure and stable control and summarizing the lack of itThis model is based on the on-line emergency control framework of "On-line Preconceive Calculation and Real-time Matching" of EEAC and performs the effective control of system through the integration of the Whole Model Stability Quantification Analysis Software with EMS and the Area Energy Stability Control System. It traces the on-line state of power system ,uses the stability threshold index provided by the controlled power system to search the control strategy of the minimum cost rapidly which corresponds with the given fault sets and satisfies definite system stability threshold value, refreshes the control decision table of the control executable equipments regularly and has a strong ability to adapt itself to the change of the development of the power system the operation ways.The Transient Stability Control System of the on-line Predictability is described.On the basis of the system structure model, the technique of realizing the theory foundation, data algorithm, control mechanism, system function and others of this system is further analyzed, and the feasibility and validity of the Transient Stability Control System of the on-line Predictability is demonstrated.Finally the security and stability control system of ErTan power plant is introduced, which is designed and implemented using the model given by this article. The system includesOPS, FWK and SCMS connected by the communication channel and realizes the on-line management of the entire security control system. The practical operation of the system in ErTan proved primarily the economic and social benefits it bringing to the power grid.
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