Repetitive control‐based single‐phase bidirectional rectifier with enhanced performance

Abstract

In this study, a single-phase pulse-width modulation rectifier with regenerative capability has been presented. Here, the main purpose is to achieve unity power factor with least harmonics on AC-side source current while having regulated DC voltage at output. It is very difficult to achieve aforementioned goals with commonly used proportional-integral (PI) regulators due to their limited control bandwidth, especially under rapidly varying input AC and dynamic load conditions. The disturbances on DC side are mainly due to double frequency ripple components, which are periodic in nature and are very much prominent in single-phase rectification. The problem may be further exaggerated due to the presence of periodic noise/disturbances in input AC supply. Hence, a repetitive controller (RC) is designed, which is well known for its capabilities in tracking periodic disturbances. The systematic design and modelling of stable RC controller based on internal model principle theory has been presented. The proposed control technique has been developed and simulated in MATLAB/SimPower System. The experimental results have been presented and analysed in detail to validate the performance of the proposed RC control technique in comparison with its PI counterpart.