Indonesian Journal of Electrical Engineering and Computer Science Vol. 32, No. 2, November 2023, pp. 620~631 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v32.i2.pp620-631  620 Journal homepage: http://ijeecs.iaescore.com Power management on DC microgrid with new DC coupling based on fuzzy logic Adhi Kusmantoro 1 , Irna Farikhah 2 1 Department of Electrical Engineering, Faculty of Engineering and Informatics, Universitas PGRI Semarang, Semarang, Indonesia 2 Department of Mechanical Engineering, Faculty of Engineering and Informatics, Universitas PGRI Semarang, Semarang, Indonesia Article Info ABSTRACT Article history: Received May 5, 2023 Revised Jul 5, 2023 Accepted Aug 8, 2023 In DC microgrids, the utilization of renewable energy results in disruptions. This paper proposes coordinated control of multiple batteries using a fuzzy logic controller (FLC). The goal is to regulate the voltage and power on the DC microgrid. Method used with a modified DC coupling configuration. The proposed new DC coupling topology uses 2 photovoltaic (PV) arrays. Part of the PV array output will be stored in the battery, and part will be provided to the DC bus. Apart from being connected to the DC bus, PV array1 (PV-A1) and PV array2 (PV-A2) are also connected to battery 1 (B1) and battery 2 (B2) via a buck converter. Instead, battery 3 (B3) is connected to the public grid source. The results of the study show that with FLC the voltage deviation and DC bus power are lower when in comparison to the proportional integral (PI) controller. As well, voltage on the DC bus response time with FLC produces a settling time of 0.5 seconds and an overshoot of 0.5%, while the PI controller produces a settling time of 1.15 seconds with an overshoot of 27.6%. Keywords: DC microgrid DC-coupling Multi-battery Power management Photovoltaic array This is an open access article under the CC BY-SA license. Corresponding Author: Adhi Kusmantoro Department of Electrical Engineering, Faculty of Engineering and Informatics, Universitas PGRI Semarang Semarang, Indonesia Email: adhikusmantoro@upgris.ac.id 1. INTRODUCTION In the following few years, newly developed energy has reduced the majority of the world's demand for listicles. Microgrids, which integrate renewable energy sources into their distribution systems, are gaining favor as a potential technology. A combination of load demand and resource integration, such as solar panels, wind turbines, diesel generators, and battery storage systems. In order to deliver electrical energy to the consumer, the microgrid integrates a variety of distributed power, load, energy storage, and control devices. A practical and appropriate method for maximizing the usage of distributed energy is microgrid technology [1]. The scientific community is embracing microgrids as the electricity grid of the future. A small-scale energy network made up of loads and distributed energy resources is what is commonly referred to as a microgrid. However, neither has a well-defined concept nor a well-defined scope. The monitoring units are under additional strain due to the integration of renewable energy resources (RER). The RER depends on intermittent natural events, leading to an unreliable power supply. A demand-supply mismatch could result from network instability brought on by RER power production changes. Researchers proposed many strategies to address these issues [2]. To increase the stability of the DC microgrid, a DC bus voltage regulation can be used. Voltage-mode or current-mode proportional integral (PI) controllers are frequently used to manage voltage on the DC bus. However, the main problem with PI controllers is that it might be challenging for them to successfully satisfy both dynamic response performance and stability requirements and stability criteria because they are frequently at odds with one another [3], [4].