Control Method of High-power Flywheel Energy Storage System Based on Position Sensorless Algorithm

In this paper, a direct arcsine method based on motor-side voltage is proposed to estimate rotor position and speed. However, under high power, the inductive voltage drop of the flywheel motor is larger, and the motor-side voltage has a larger phase difference with the counter-electromotive force of the motor. By analyzing the operating state of the voltage circle during flywheel charging and discharging at high power, the angle is compensated, so that the angle can be corrected. This paper also gives the control method for charging and discharging the flywheel energy storage system based on the speed-free algorithm. Finally, experiments are carried out on real hardware to verify the correctness and effectiveness of the control method of flywheel energy storage system based on the speed sensorless algorithm.