| With the inter-connection of large-scale power grid and development of electric power market in China, the operation of power system become more flexible. Fast and accurately method for stability control is required. it is hardly to satisfy the stability control requirement by traditional schemes based on "offline stability analysis and simple decentralized control ". We should pay more attention to research a novel stability control system based on "online pre-decision and real-time match"method . First , the necessarily and the feasibility of on-line pre-decision transient stability control system based EMS real-time data have been discussed . With the development of the EMS system, the real-time data of EMS is satisfied for transient stability analysis and control; The soft of the transient stability analysis (such as PSASP or BPA) has improved quick in these year ; And the research of novel intelligent regional stability executive devices has made rapid progress . All of these could help us reality the new stability control system. Then the paper devotes to solve some project problem by the working in the novel on-line pre-decision transient stability control system of Central China Power System based on online stability calculation using real-time data from EMS . The method of achieve real-time information of whole the power system from EMS system using AQL interface is described.And a interface with the classical program of stability-analysis has been designed. In order to process the EMS data ,expert system and divided area theory are introduced . In an addition , the centralize-manage of the strategy sheet and the method of Optimal control decision-searching are two another advantages of the novel control system . Finally , the parallel technology is been studied to speed the online stability calculation . And the on-line pre-decision transient stability control system of Central China Power System has been test well .
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