Research on Control Strategy of Flywheel Energy Storage System in Urban Railway System

In recent years, China’s urban rail transportation has developed rapidly. It is in line with the direction of urban railway system development to study the technology of regenerative braking energy recovery and utilization and to add energy storage devices to enhance the utilization of regenerative braking energy. It not only plays a significant role in achieving the goal of “2030 carbon peak, 2060 carbon neutrality”, but also has significant meaning for energy saving and sustainable development. Flywheel Energy Storage System (FESS) has the advantages of high instantaneous power, high energy storage density, high efficiency, long service life and no environmental pollution. In this paper, the FESS charging and discharging control strategy is analyzed, and the active disturbance rejection control (ADRC) strategy is adopted and improved. In order to verify the effectiveness and feasibility of the proposed method, a simulation model is built in MATLAB/Simulink simulation platform. The control performance is compared with that of the traditional PI controller, and the simulation results show that the improved ADRC control strategy has certain advantages.