Abstract
This paper proposes an energy management system (EMS) of direct current (DC) microgrid. In order to implement the proposed EMS, the control and operation method of EMS is presented in this work. While most of the studies have individually examined the grid-connected mode used in building and the stand-alone operation mode applicable to the island, the proposed EMS allows it to be used in both grid-connected mode and stand-alone mode with 10 modes. In order to determine each mode in EMS, not only the amount of generated power, load power, and the state of charge (SOC) of the battery, but also the rated power of the energy storage system (ESS) converter that performs charging and discharging operations is additionally considered. Thus, various uncertainties that may occur in the actual DC microgrid environment can be improved. A laboratory-scale DC microgrid is fabricated to conduct experimental validation of proposed EMS. Experiments of DC microgrid with proposed EMS were performed for each mode, and the experiment waveforms of each power conversion device are included in detail.
Highlights
Another is a study on direct current (DC) microgrid that can improve distribution efficiency by reducing power conversion stages along with designing a high-efficiency power conversion device to cope with the increasing demand for digital loads
Information from the components that make up DC microgrid can be divided into rated power and state of charge (SOC) of battery SOCbat
In order to confirm the validity of the proposed energy management system (EMS), experiments were conducted on on distributed energy resources (DERs), multilevel inverters and energy storage system
Summary
The first is to develop and expand alternative energy based on renewable energy sources (RESs) such as wind and solar energy. Another is a study on direct current (DC) microgrid that can improve distribution efficiency by reducing power conversion stages along with designing a high-efficiency power conversion device to cope with the increasing demand for digital loads. For this reason, research on distributed energy resources (DERs) using eco-friendly energy and research on DC microgrids is increasing rapidly around the world
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