Robustness improvement of predictive current control for PMLSM integrating adaptive internal model with time delay compensation

This paper presents a robustness-improving discrete-time current controller utilizing predictive current control (PCC) for permanent magnet linear synchronous motor (PMLSM). The stability and robustness of the PCC system is highly affected by the parameters mismatch between the controller and the plant, and the inherent digital control delay can limit the bandwidth. Toward this, an integrated method considering both the parameters variation utilizing an adaptive internal model estimation with improved variable-gain adaptive law and the time delay compensation in discrete form is proposed. Validity and effectiveness of the proposed method is demonstrated by the simulation and experimental results.