Charging-Discharging Control Strategies of Flywheel Energy Storage Based on a Dual Three-Phase Permanent Magnet Synchronous Motor

To solve the random, intermittent, and unpredictable problems of clean energy utilization, energy storage is considered to be a better solution at present. Due to the characteristics of large instantaneous power, high energy density, and fast charging and discharging speed, flywheel energy storage currently occupies an important position in new energy storage. In this paper, a dual-three-phase permanent magnet synchronous motor is introduced into the flywheel energy storage system to output higher power and smaller current harmonics at lower bus voltage. A flywheel energy storage model is established, and a charge-discharge control strategy based on the model is proposed. The charge-discharge control is tested through simulation experiments. The results show that the proposed control strategy can effectively control the system for charging-discharging control in the flywheel energy storage using dual three-phase permanent magnet synchronous motors.