An Alternative Distributed Control Architecture for Improvement in the Transient Response of DC Microgrids

TL;DR

This paper proposes an alternative distributed control architecture for DC microgrids that enhances transient response and stability by reducing mutual interference between control loops, validated through experimental results.

Contribution

It introduces a novel control architecture based on small signal analysis to improve transient performance in DC microgrids, addressing mutual effects of traditional parallel controllers.

Findings

Improved transient response in current sharing control.

Enhanced DC bus voltage stability.

Experimental validation confirms performance improvements.

Abstract

Distributed secondary control plays an important role in DC microgrids, since it ensures system control objectives, which are power sharing and DC bus voltage stability. Previous studies have suggested using a control architecture that utilizes a parallel secondary bus voltage and current sharing compensation. However, the parallel controllers have a mutual impact on each other, which degrades the transient performance of the system. This paper reports on an alternative distributed secondary control architecture and controller design process, based on small signal analysis to alleviate the mutual effect of the current sharing and bus voltage compensation, and to improve the transient response of the system. Experimental results confirm the improved transient performance in the current sharing control and DC bus voltage stability utilizing the proposed control architecture.