Core Insights - The project led by North China Electric Power Research Institute has achieved international leading-level key technologies in the integration of large-capacity AC excitation variable-speed pumped storage units into high-power systems, filling a domestic gap in testing and verification systems for such units [1] Group 1: Project Overview - The project is based on the first domestic 300 MW AC excitation variable-speed pumped storage unit in Fengning, Hebei, and has been in development since 2018 [1] - Collaborating institutions include Tsinghua University, Zhejiang University, Harbin Institute of Technology, and various research and industry units [1] - Key breakthroughs were made in optimizing network performance, detailed electromechanical transient modeling, and ensuring safe and stable operation of power plants [1] Group 2: Technological Contributions - The variable-speed pumped storage unit's unique power regulation capabilities allow for efficient and stable storage and flexible utilization of intermittent renewable energy sources [1] - The project has established a comprehensive technology and management system covering demand analysis, function positioning, performance optimization, testing, and field trials [1] - The results provide a paradigm for managing the network performance of large-capacity power electronic equipment and have reference value for the development of other new large-capacity power electronic devices [1] Group 3: Future Directions - North China Electric Power Research Institute will continue to focus on supporting large-scale renewable energy consumption in Hebei and enhancing the safety and efficiency of the Zhangbei flexible DC grid [2] - The institute aims to further improve the key technology system for large-capacity variable-speed pumped storage units and expand the application of these technologies [2] - Efforts will be made to develop national and industry technical standards to support the country's energy transition and the construction of new power systems [2]