Core Insights - The project led by North China Electric Power Research Institute has achieved international leading level in key technologies for large-capacity AC excitation variable-speed pumped storage units connected to 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 construction and application of the first domestic 300 MW AC excitation variable-speed pumped storage unit in Fengning, Hebei, and has been organized since 2018 by North China Electric Power Research Institute and State Grid North China Branch [1] - The project involved collaboration with well-known domestic universities, research institutes, and industry units to achieve breakthroughs in system coordination technology, ensuring the unit's timely production and stable operation [1] Group 2: Technological Achievements - Key technological breakthroughs include optimization of network performance for AC excitation variable-speed pumped storage units, detailed electromechanical transient modeling and simulation, and ensuring safe, stable, and economical operation of power plants [1] - The project has established a systematic technology framework for network coordination, which is crucial for the integration of renewable energy sources in the Beijing-Tianjin-Tangshan power grid [1] Group 3: Future Directions - North China Electric Power Research Institute will continue to focus on supporting large-capacity variable-speed pumped storage units for the large-scale consumption of renewable energy in northern Hebei and the safe and efficient operation of Zhangbei flexible DC grid [1] - The institute aims to further improve the key technology system for network coordination of large-capacity AC excitation variable-speed pumped storage units, expand the application fields of these technologies, and contribute to the development of national energy transition and new power system construction [1]