| Title |
Development of Low-voltage Seamless Transfer Microgrid on Grid-connected Type Islands by Autonomous Operation |
| Authors |
김정헌(Kim, Jeong Hun) ; 권정민(Kwon, Jung-Min) ; 윤상윤(Yun, Sang-Yun) |
| DOI |
https://doi.org/10.5370/KIEEP.2017.66.4.169 |
| Keywords |
Low-voltage microgrids ; Grid-connected islands ; Seamless transfer ; Autonomous operation ; Power conditioning system |
| Abstract |
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. |