Model-Free Predictive Combined Control for Three-Phase Grid-Connected Voltage Source Converters

Abstract

This paper proposes a model-free predictive combined control for three-phase grid-connected voltage source converters. It controls current components in the grid virtual flux reference frame according to the combined control method, along with the current prediction based on the predictive control method. The method has an inherent rapid dynamic response and high power quality with low sampling frequency. It avoids using any system parameters in the control structure, leading to a proper performance even with no information of system parameters. The method is simple and has a low computation burden, and lacks any pulse-width modulation (PWM) sub-system, additional sensor, and lookup table. The method is evaluated through simulation studies, where the results represent the effectiveness of the proposed method and its superiority over conventional method under parameter mismatch conditions.