A Repetitive Control- based Approach for Power Sharing among Boost Converters in DC Microgrids

Abstract

In this paper a repetitive control (RC) approach to improve current sharing between parallel-connected boost converters in DC microgrids is presented. The impact of changes in line impedance on current sharing is investigated. A repetitive controller is designed and connected in series with current controller of the boost converters to control the switching signals such that by regulating of the output voltage of each converter, the circulating current is minimized. The performance of the proposed control strategy is validated through simulation.

Keywords

• DC microgrid
• repetitive control
• current sharing
• boost converter