BONKURI SAMARPAN,BANOTH SURESH,BABU RAO PADDAM 02 11 Energy storage is the capture of energy produced for use at a time to time Hybrid storage devices are used in microgrids to provide power backup solutions when the distributed energy resources DERs are unable to supply the load demands This work deals with the design and stability analysis of a DC microgrid with batterysupercapacitor energy storage system under variable supercapacitor operating voltage The conventional design method reported in the literature considers the rated supercapacitor voltage in the modeling and design of controllers However the supercapacitor unit can discharge as low as 10 of its rated voltage due to selfdischarge It is observed that the conventional method of controller design can potentially make the system unstable This paper proposed an optimal super capacitor voltage to be considered in the design is calculated and a design method is proposed to ensure the stability of DC microgrid in all operating modes Copyright (c) Journal of Science Engineering Technology and Management Science. All rights reserved 2026