High-speed Maglev Harmonic Current Suppression Strategy Based on Feedforward Compensation

In order to solve the problem of high harmonic content of phase current during operation of high-speed maglev train, a harmonic suppression strategy based on voltage feedforward compensation is proposed. The fifth and seventh harmonic currents with the highest harmonic content are detected by transforming the coordinates to the fifth or seventh rotating coordinate system and low-pass filtering the current. A harmonic mathematical model of the long-stator linear motor of the high-speed maglev train under double feeding mode (DF) is established, and on the basis of the model, the feedforward voltage is calculated as the harmonic compensation amount to complete the suppression of current harmonics. The simulation results show that the method based on the harmonic voltage feedforward compensation can effectively suppress the content of the harmonic current of the motor, and the strategy is practical and easy to implement.