An Active Damping Control Strategy Based on Current Differential Feedback for High-Speed SPMSM Systems Fed by the Current Source Inverter

An active damping control strategy based on the motor current differential feedback for the high-speed surface-mounted permanent magnet synchronous motor (SPMSM) system fed by the current source inverter is proposed to suppress output resonance. This strategy is only based on the motor current sampling. Therefore, extra voltage sensors in conventional methods can be cancelled. In order to suppress high-frequency noises introduced by the differential feedback, a low-pass filter is employed in the feedback channel. Next, the relationship between the cut-off frequency and the damping interval is discussed. On this basis, the cut-off frequency design method is presented. Moreover, considering the effect of control delay on the performance of the high-speed SPMSM system, the collaborative design method of the controller parameters and the active damping coefficient are designed in the discrete domain. Finally, the experimental results verify the effectiveness and robustness of the proposed strategy.