Control and Operation of a Small Autonomous DC Microgrid with Improved Dynamic Performance

Abstract

An islanded DC Microgrid comprises dispatchable and renewable generation units, battery energy storage systems, and loads. An islanded DC microgrid presents several operational challenges due to load and renewable generation fluctuations. Therefore, a dynamic performance analysis is required to ensure that a DC Microgrid operates satisfactorily. In this study, we have analyzed the dynamic performance of an islanded DC microgrid in detail. Based on the dynamic analysis, we have proposed a primary control method for improving the system dynamic response. We have derived a small-signal model of the entire DC Microgrid and carried out an eigenvalue and participation factor analysis. Based on the participation factor analysis, suitable system states are identified, and a controller is designed for a better transient performance of the system. Time-domain simulations in EMTDC/PSCAD are carried out to verify and establish that the method proposed in this paper yields a satisfactory system performance.