Domestic flywheel energy storage unit exceeds 1MW for the first time

On November 10, the single-unit output power of flywheel energy storage in the Inner Mongolia Autonomous Region's major science and technology project "Research on Key Technologies of MW-level Advanced Flywheel Energy Storage" led by China National Nuclear Energy reached 1MW for the first time. This is the maximum grid-connected power achieved by a single flywheel in China for the first time. The core components of the flywheel, motor, magnetic bearing and single-unit integrated control tests have been completed. According to the plan, the three 1MW flywheels will continue to conduct array coordinated control tests and then be incorporated into the China National Nuclear Energy Erenhot 99MW wind farm, forming a hybrid energy storage system with 3MW/3MWh of battery energy storage, providing primary frequency regulation services for the Erenhot wind farm. This project will provide important experimental data and practical experience for exploring the practical application of flywheel energy storage array systems in primary frequency regulation of wind farms.

Under the guidance of the "dual carbon" goals, it is of great significance to accelerate the construction of a new power system. As a strategic platform for the development of non-nuclear clean energy of China National Nuclear Corporation and China National Nuclear Power, CNNC Energy has taken the initiative to assume the responsibility for the stable operation of the power grid and actively explored solutions to the primary frequency regulation problem. In July 2020, a scientific experiment in which a flywheel and battery hybrid energy storage system participated in the primary frequency regulation of the power grid in Shanxi proved that the flywheel's fast and high-frequency response characteristics are most suitable for primary frequency regulation applications, and can effectively improve the operating conditions of the battery energy storage system and achieve the purpose of extending battery life. The demonstration project carried out at the Erenhot Wind Farm will explore the operating mode of flywheels, batteries and wind farms working together to meet the requirements of primary frequency regulation through the long-term operation of the hybrid energy storage system on the grid, and find the most economical solution for the primary frequency regulation of wind farms.