International Journal of Power Electronics and Drive Systems (IJPEDS) Vol. 13, No. 4, December 2022, pp. 2190~2198 ISSN: 2088-8694, DOI: 10.11591/ijpeds.v13.i4.pp2190-2198  2190 Journal homepage: http://ijpeds.iaescore.com Decentralized dynamic power control in an islanded DC microgrid with hybrid energy storage system Sharmila Nagaraju 1 , Nataraj Kanathur Ramaswamy 2 1 Department of Electrical and Electronics Engineering, JSS Science and Technology University, Mysuru, India 2 Department of Research and Development, Don Bosco Institute of Technology, Bengaluru, India Article Info ABSTRACT Article history: Received Jun 24, 2022 Revised Aug 31, 2022 Accepted Sep 13, 2022 The integration of renewable energy resources to utility grid calls for selection of suitable storage system to store generated energy with reliable supply of demand and selection of efficient control system for smooth control of the grid. Battery is the most common energy storage system. Combining a supercapacitor to it makes the system performance better during transients. This paper proposes a hybrid energy storage system with a battery and a supercapacitor to reduce transient power fluctuations and improve the life span of the battery by reducing the charging/discharging cycles with the incorporation of supercapacitor. The battery compensates constant power fluctuations whereas the supercapacitor compensates the transient power fluctuations. This system design offers improved performance, with better regulation of dc link voltage, frequency regulation compared to microgrid with single energy storage. The dynamic performance of the system under varying load conditions has been improved. The work proposes the power management algorithm, which helps in efficient monitoring and smooth control of the entire system. Integration of supercapacitor to the storage system enhances the performance of the microgrid, increases life span of battery and reduces the stress on battery. The DC link bus voltage is efficiently regulated and the demand is supplied reliably. Keywords: DC link voltage Hybrid energy storage system Hysteresis controller Microgrid Supercapacitor This is an open access article under the CC BY-SA license. Corresponding Author: Sharmila Nagaraju Department of Electrical and Electronics Engineering, JSS Science and Technology University Campus Rd, Mysuru, Karnataka 570006, India Email: sharmila.n.89@gmail.com 1. INTRODUCTION The increasing demand for electricity calls for research on different energy sources to generate electricity, storage systems to integrate into microgrids to store energy generated from renewable sources, control techniques to have effective control and co-ordination of the grid components. A well-designed grid including renewable energy sources like solar photovoltaic PV, windmills, hydro, bioenergy and suitable energy storage system can deliver reliable and uninterruptable power to demand like hospital, school, community or can work in grid connected mode to improve system’s reliability. Effective control circuit is the crucial part for the system’s satisfactory behavior. In the recent times, DC microgrid is gaining popularity and being implemented in residential and industrial sector [1]−[3]. Harnessing solar energy is gaining popularity due to the latest conversion technologies and advancement in solar panel design and fabrication process. However, integration of a suitable storage system to the microgrid becomes essential as the solar energy is intermittent and dilute in nature. Battery is a significant and popular energy storage device, finding application due to its high energy storage. Several