Three-Vector Model Predictive Current Control of Permanent Magnet Synchronous Motor Based on SVM

Abstract

Aiming at the problem that the conventional model predictive current control (MPCC) of permanent magnet synchronous motor (PMSM) fed by two level voltage-source inverter (VSI) applies only one voltage vector during a control period, which makes the stator current tracking control over-regulated or under-regulated, a three-vector model predictive current control algorithm based on space vector modulation (SVM) is investigated in this paper. The principle of SVM, the parallelogram law, is adopted to synthesize the expected voltage vector with two adjacent active vectors, so that the expected voltage vector can cover any phases and amplitudes. The durations of the basic voltage vectors are calculated by the principle of deadbeat current control. The time delay caused by the computing time will cause the stator current to oscillate around its reference and increase the torque ripples. To address this, the delay compensation method is employed to improve the control performance of the system. The validity and feasibility of the proposed method is verified by the comparative researches of simulation modeling.