Hybrid Energy Storage System consisting of a Flywheel and a Lithium-ion Battery for the Provision of Primary Control Reserve

The investigated Hybrid Energy Storage System consists of a flywheel and a lithium-ion battery. The system is integrated in a production plant, improving its power quality and intending to offer primary control reserve services to the grid. The electrical structure of the system and its basic components are analyzed. A one-day simulation for the provision of primary control reserve is analyzed. Additionally, a simulation for the four-year provision of primary control reserve reveals an improved battery lifetime. The reduction of the battery cyclical aging due to the flywheel operation is discussed.