Model-Free Predictive Current Control for Three-Phase AC/DC Converters Based on Hybrid SVM to Minimize Current Harmonics

Model-based predictive current control based on space vector modulation (SVM-MBPCC) is widely used in three-phase pulse-width-modulated (PWM) AC/DC converters because of its good steady-state performance. However, the conventional SVM-MBPCC method depends on the accuracy of system model and parameters. Recently, model-free predictive current control based on SVM (SVM-MFPCC) has been proposed to solve the problem of parameter robustness. However, its steady-state performance is inferior to that of SVM-MBPCC with accurate parameters. This paper combines the conventional SVM-MFPCC with a hybrid SVM method (HSVM-MFPCC), which inherits the strong parameter robustness and reduces current harmonics significantly by selecting the optimal vector sequence of SVM online. The simulated results indicate that the proposed HSVMMFPCC can reduce the current total harmonic distortion (THD) by 27.4% than conventional SVM-MFPCC in high range of modulation indexes.