Droop Control in Decentralized Inverter-Based AC Micro-Grid in MATLAB Simulink

Abstract

The paper delves into an in-depth analysis of power-sharing dynamics within a low-voltage AC microgrid with three inverters running in parallel. In microgrids, the absence of reliable AC sources poses a significant challenge, making regulating voltage, current, and frequency complex. To unravel these intricacies, the study strategically incorporates three distributed energy sources, three static loads, and a dynamic load into the experimental setup. However, it is worth noting that low voltage line impedance often leads to uneven power distribution among the microgrid components. In response to this issue, the paper introduces a novel virtual impedance-based distributed grid-supporting control method. This innovative approach aims to intelligently enhance power-sharing capabilities by leveraging positive and negative impedances. The proposed method effectively boosts power-sharing among the inverters by harnessing both impedances, thereby minimizing voltage dips and optimizing overall grid performance. Through this meticulous exploration and implementation of grid-supporting control strategies, the paper sheds light on the potential for improving the efficiency and stability of low-voltage AC microgrids, paving the way for enhanced reliability and performance in future microgrid systems.