1.State Grid Corporation of China, Beijing 100031, China;2.China Electric Power Research Institute, Beijing 100192, China;3.NARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 211106, China

To adapt to the challenges faced in the construction process of new power systems, according to the concept of “inheritance, integration and innovation”, the overall architecture for the new generation of online security analysis is proposed. In the areas of model data, functional systems, business scenarios, and human-computer interaction, through the orderly cooperation of basic platform, real-time measurement, electrical network analysis and simulation computation, the connection and interaction between multi-source data and online analysis applications are realized, such as equipment model parameters, real-time measurement information, stability control model, stability limits. For the emerging new characteristics of power system operation, new functions are developed such as online electromechanical-electromagnetic hybrid simulation and online evaluation of rotational inertia and renewable energy multi-feed short-circuit ratio, which make the new generation of online security analysis architecture more scientific, analysis faster, simulation more accurate, ecology more open, and human-computer more friendly. The relevant achievements have been deployed on the dispatching and control cloud platform and served for dispatching agencies at or above the provincial level of the power system. Finally, the future development trends are proposed from four aspects of equipment modeling, computing efficiency, simulation analysis, and result application.