Simplified Continuous-Control-Set Model Predictive Control for LCL-Equipped High-Speed PMSM With High Dynamic Performance

Abstract

In high-speed motor drives, the installation of inductance-capacitance-inductance (LCL) filter can alleviate the additional losses caused by current harmonics and mitigate the $\boldsymbol{dv/dt}$ voltage significantly. However, sophisticated current controller design is required to eliminate the resonance introduced by the filter. Numerous active damping techniques based on frequency domain analysis have been presented, which realize satisfactory resonance suppression effect but typically have limited dynamic performance. Several model predictive control (MPC) methods have been developed to substitute the existing active damping designs and improve the control performance. However, these methods always contain the high-order observer, which increases the complexity of tuning and digital implementation. This article proposes a novel continuous-control-set MPC design that simultaneously achieves high dynamic and desirable steady-state performance without the need for a high-order observer or additional active damping. Furthermore, this article provides the frequency domain analysis and parameter design method for the proposed MPC. The simulation and experimental results demonstrate the superiority of the proposed method and its suitability for implementation in digital controllers.