자율운전에 의한 계통연계형 도서의 저압 무순단 마이크로그리드 구축

• Published in: 전기학회 논문지 P권, 66(4) Vol. 66P; no. 4; pp. 169 - 176
• Main Authors: 김정헌(Jeong Hun Kim), 권정민(Jung-Min Kwon), 윤상윤(Sang-Yun Yun)
• Format: Journal Article
• Language: Korean
• Published: 대한전기학회 2017
• Subjects: 전기공학; Seamless transfer; Autonomous operation; Power conditioning system; Low-voltage microgrids; Grid-connected islands
• ISSN: 1229-800X; 2586-7792

This paper presents research on low-voltage microgrids to maintain a continuous power supply to critical loads on grid-connected islands in Korea. The low-voltage microgrids of this paper focused on that changes public office buildings into uninterrupted microgrids by autonomous operation. For this, a microgrid controller (MGC) and a power conditioning system (PCS) that allow a seamless transfer between grid-connected and grid-isolated operation are proposed. The proposed PCS operates with a silicon controlled rectifier (SCR) switch and employs a simple structure. It supplies power continuously without operators through a coordinated operation between MGC and PCS. In addition, proposed MG has a schedule operation for minimizing electricity charges and provides ancillary services that enable the utilization of resources according to the operation purpose of utility distribution networks. To demonstrate the uninterrupted low-voltage microgrid proposed in this study, a microgrid was implemented and tested in a public office building in Anjwa Island, Jeollanam-do in Korea. A seamless, autonomous operation history, despite system disturbances, was obtained through a long-term demonstration of operation. The results showed that the proposed microgrid technology can be used to achieve energy resilience in grid-connected island areas.