Multivariable Feedback Damping Control of <i>LC</i>-Filtered PMSM for Resonance Suppression With Fast Dynamic Response

Active damping is essential to suppress resonance for permanent magnet synchronous motor (PMSM) with the LC filter, however, it is difficult for the conventional damping schemes to selectively improve the dynamic response and the damping effect. Based on the inverter-side current, motor-side current and voltage, this article proposes a novel multivariable feedback (MVF) active damping scheme for the LC-filtered PMSM to flexibly enhance the damping effect and dynamic performance. Moreover, the MVF parameter design is very simple. By using the variable MVF parameters, the resonance peak and the open-loop cutoff frequency of the MVF current loop can be changed freely, hence, the selective damping targets can be balanced damping effect and dynamic performance, better damping effect, and faster dynamic response, respectively. The physical interpretation is presented, the stability, robustness, damping effect and dynamic response of the proposed MVF active damping system are analyzed. The experimental results about a 1.1-kW PMSM are provided to verify the effectiveness of the proposed MVF damping scheme.