Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Study on Optimal Design of Hybrid System of New and Renewable Energy-Linked Microgrid

신재생에너지 연계형 마이크로그리드의 하이브리드시스템 최적 설계 연구

  • Lee, Jae-Kyung (Department of Electrical and Control Engineering, Mokpo National University) ;
  • Han, Yong-Chan (Department of Electrical and Control Engineering, Mokpo National University) ;
  • Kwon, Sung-Gi (Department of Electrical and Control Engineering, Mokpo National University) ;
  • Park, Gye-Choon (Department of Electrical and Control Engineering, Mokpo National University)
  • 이재경 (목포대학교 전기및제어공학과) ;
  • 한용찬 (목포대학교 전기및제어공학과) ;
  • 권성기 (목포대학교 전기및제어공학과) ;
  • 박계춘 (목포대학교 전기및제어공학과)
  • Received : 2022.08.18
  • Accepted : 2022.08.23
  • Published : 2022.11.01
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Abstract

Microgrid, which enables the production and consumption of electricity to be done independently on a small scale, has been studied on one of the solutions of reinforcement for flexibility of electronic system. This study examined the application effect of new microgrid by applying hybrid battery in electric power storage device. We designed the system to highlight the advantage of each battery and complement the disadvantage by using hybrid system with Lithium-ion battery and interval Redox flow battery. It runs with lithium-ion battery during the initial startup while the Redox flow battery operates for a long time at the end of excessive period, and it enables a discharge of Lithium-ion and Redox flow battery at the same time when the load has a large output. We chose Maldives as a subject of this study for organizing and optimizing independent microgrid. Maldives is the country to accomplish 100% domestic electricity in South Asia, but the whole electric power is supplied through diesel generation imported fossil fuel. We organized and optimized microgrid for energy independence on Malahini island to solve Maldives energy cost problem and global energy environment matters. We analyzed the daily power supply and accumulated the power supply from September 18, 2018~February 11, 2019. The accumulated power supply was about 120.4 MWh and the daily power supply was about 800~1000 kWh. Based on the collected information, we divided the cases into three models which are only diesel generator, solar generator as well as diesel generator, and solar+ESS+diesel generator. We analyzed the amount of oil consumption compared to the cost of construction and power output. The result showed that solar+ESS+diesel generator was most economically feasible. As well, we obtained that our considering hybrid battery system reduced the fuel consumption for diesel power generation about 10~15%.

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