Browse > Article
http://dx.doi.org/10.5370/KIEEP.2017.66.4.169

Development of Low-voltage Seamless Transfer Microgrid on Grid-connected Type Islands by Autonomous Operation  

Kim, Jeong Hun (Korea Electric Power Corporation (KEPCO) Research Institute)
Kwon, Jung-Min (Department of Electrical Engineering, Hanbat National University)
Yun, Sang-Yun (Korea Electric Power Corporation (KEPCO) Research Institute)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.66, no.4, 2017 , pp. 169-176 More about this Journal
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.
Keywords
Low-voltage microgrids; Grid-connected islands; Seamless transfer; Autonomous operation; Power conditioning system;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 W.-K. Chae et al., "Design and field tests of an inverted based remote microgrid on a Korean island," Energies, vol. 8, pp. 8193-8210, August 2015.   DOI
2 Navigant Consulting Inc., Microgrid multi-client study, Navigant(Burlington, USA), 2015.
3 Y. I. Mohamed and A. A. Radwan, "Hierarchical control system for robust microgrid operation and seamless mode transfer in active distribution systems," IEEE Trans. on Smart Grid, vol. 2, no. 2, pp. 352-362, June 2011.   DOI
4 T. L. Vandoorn et al., "Transition from islanded to grid-connected mode of microgrids with voltagebased droop control," IEEE Trans. on Power Systems, vol 28, no. 3, pp. 2545-2553, August 2013.   DOI
5 Y. Chen et al., "Seamless transfer control strategy for three-phase inverter in microgrid," IPEMC-ECCE Asia, Hefei(China), pp. 1759-1763, May 2016.
6 F. Tang et al., "Distributed active synchronization strategy for microgrid seamless reconnection to the grid under unbalance and harmonic distortion," IEEE Trans. on Smart Grid, vol. 6, no. 6, pp. 2757-2769, November 2015.   DOI
7 S. I. Gkavanoudis and C. S. Demoulias, "A control strategy for enhancing the fault ride-through capability of a microgrid during balanced and unbalanced grid voltage sags," Sustainable Energy, Grids and Networks, vol. 3, pp. 1-11, June 2015.   DOI
8 J. Xiao, P. Wang and L. Setyawan, "Implementation of multiple-slack-terminal DC microgrids for smooth transitions between grid-tied and islanded states," IEEE Trans. on Smart Grid, vol. 7, no. 1, pp. 273-281, January 2016.   DOI
9 J.-M. Kwon, "Three-phase power equalizing system with UPS function based on battery storage," Trans. Korean Inst. Power Electron, vol. 17, no. 4, pp. 353-358, August 2012.   DOI
10 E.-H. Kim, J.-M. Kwon and B.-H. Kwon, "Transformerless three-phase on-line UPS with high performance," IET Power Electronics, vol. 2, no. 2, pp. 103-112, 2009.   DOI
11 J.-M. Kwon, B.-H. Kwon and K.-H. Nam, "Grid-connected photovoltaic multistring PCS with PV current variation reduction control," IEEE Trans. on Industrial Electronics, vol. 56, no. 11, pp. 4381-4388, November 2009.   DOI
12 IEEE Std. 1547, IEEE standard for interconnecting distributed resources with electric power systems, IEEE, 2003.