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http://dx.doi.org/10.5370/KIEE.2013.62.2.201

Seamless Transfer Operation Between Grid-connected and Stand-Alone Mode in the Three-phase Inverter  

Lee, Wujong (Dept. of Electrical Engineering, Cuingnam National University)
Jo, Hyunsik (Dept. of Electrical Engineering, Cuingnam National University)
Lee, Hak Ju (Korea Electri Power Research Institute)
Cha, Hanju (Dept. of Electrical Engineering, Cuingnam National University)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.62, no.2, 2013 , pp. 201-207 More about this Journal
Abstract
This paper propose seamless transfer operation between grid-connected and stand-alone mode in the three-phase inverter for microgrid. The inverter operates grid-connected mode and stand-alone mode. Grid-connected mode is the inverter connected to grid and stand-alone mode is to deliver energy to the load from inverter at grid fault. When conversion from gird-connected to stand-alone mode, the inverter changes current control to voltage control. When grid restored, the inverter system is conversion from stand-alone to grid-connected mode. In this case, load phase and grid phase are different. Therefore, synchronization is essential. Thus Seamless transfer operation stand-alone to grid-connected mode. In this paper, propose sealmless transfer operation between grid-connceted and stand-alome mode, and this method is verified through simulation and experiment.
Keywords
Microgrid; Grid-connected; Stand-alone; PLL Synchronization;
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