Autonomous Decentralized Cooperative Control DC Microgrids Realized by Directly Connecting Batteries to the Baseline

Recent years have seen increasing attention paid to autonomous decentralized microgrids that are disaster-resistant and suitable for local consumption of locally generated renewable energy power. Although various methods have been discussed for achieving microgrids through autonomous decentralized cooperative control, there are few reports that have reached the stage of field testing. In this study, I propose a novel method for configuring the baseline of DC microgrids, where storage batteries are distributed and directly connected to the DC bus. I have built a testbed to demonstrate the operation of the DC microgrid through autonomous decentralized cooperative control. My method simply employs the droop characteristics inherent in batteries, and I introduce the new concept of a ‘weakly coupled grid’. This approach allows the realization of microgrids with autonomous decentralized cooperative control without the need for advanced and complex grid control technologies using DC/DC converters, and with a simple configuration. Additionally, by directly connecting batteries to the baseline, I introduce a grid stabilization method achieved by imparting electrical inertia to the baseline. This paper describes the construction method, the operation principle, and safe and stable operational methods for autonomous decentralized microgrids using this approach, aiming to serve as a guide for those who wish to build autonomous decentralized controlled microgrids in practice.