Experimental Verification and Simulation Analysis of a Battery Directly Connected DC-Microgrid System

Abstract

The transformation towards renewable and sustainable energy, as well as the digitalization of energy, has promoted the development of the power system towards miniaturization, decentralization, and intelligence. As a solution, a battery-directly-connected DC microgrid has been proposed in previous studies for autonomous and decentralized coordination control (ADCC). We constructed a testbed of the battery directly connected DC-microgrid in our university campus which has been operating stably for more than one year. This study experimentally verifies the feasibility of the battery-directly-connected DC microgrid, and the process of autonomous, decentralized, and coordinated energy distribution between the distributed small batteries through power loading experiments. In addition, a simulator for analyzing the behavior of the DC microgrid test platform is built in MATLAB/Simulink, and its accuracy is verified based on an energy flow analysis, revealing its potential for cyber-physical-system (CPS) construction.