Damping control for power systems using energy storage

This paper proposes a controller for energy storage (ES) to improve damping of power system oscillation. The controller manages charge and discharge of an ES device to respond to the real-time frequency deviation measured locally to provide positive damping effects. The expected damping ratio improvement from an ES equipped with this controller is derived mathematically from a single-machine-infinite-bus system considering different placements of the ES. Then, the ES with this new controller is tested on both the Kufndur's two-area power system and the WECC 179-bus system to damp a targeted oscillation mode. Simulation results verify the effectiveness of the proposed controller.