On October 16, 2015, Shanghai Institute of Electrical Engineering held a conference on the identification of scientific and technological achievements in Shanghai. The key technologies for modeling, analysis and control of EHV AC / DC hybrid power grids in China are shouldered by the State Security and Stability Control Technology Branch of NARI Power Grid. Research and application of "scientific and technological projects through the identification. Accreditation Committee agreed that the research results are generally in the international advanced level, which applied to UHV AC-DC interaction study of electromagnetic transient general modeling technology, UHVDC quasi-steady-state modeling method to suppress DC commutation failure of the dynamic Power compensation device optimization configuration and DC control parameters optimization method is in the leading international level. "Research and Application of Key Technologies for Modeling, Analysis and Control of UHV AC / DC Hybrid Power Grids in East China" The science and technology project was launched in February 2014 to establish an all-round and comprehensive technology system for AC / DC hybrid power grids with a focus on UHV AC / DC Hybrid power grid modeling and simulation technology, UHV AC / DC hybrid power grid security and stability analysis and control technology, UHV AC / DC hybrid power grid frequency modulation and frequency modulation coordinated control technology and UHV AC / DC hybrid power grid equipment operation technology four major issues. The project has made a number of innovative achievements and comprehensively analyzed the challenges to the safe and stable operation of East China Power Grid. It also studied and formulated corresponding safety control strategies to enhance the technical level of power system analysis and ensure the safe and stable operation of UHV AC / DC hybrid power grids. After the UHV network security and stability of the national grid to provide technical support. A number of achievements have been applied in the Binjin UHVDC Project, Zhejiang Ford High Voltage AC Project and the on-line system, which effectively ensured the smooth operation of the Binjin UHV DC Project and Zhejiang Ford UHV AC Project.