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Based on the large power grid simulation and the existing security prevention and control mode, this paper further integrates the multi-step transient hybrid simulation architecture computing technology to research the high-performance analysis and situational awareness simulation technology of interconnected AC / DC large power grid security and stability characteristics. So as to realize the “panoramic situational awareness, wide area coordinated control, flexible and efficient service” of large power grid, and improve the super large scale power grid Comprehensive security defense and intelligent monitoring level of panoramic, multi-dimensional and three-dimensional.