| Title |
Seamless Transfer Operation Between Grid-connected and Stand-Alone Mode in the Three-phase Inverter |
| Authors |
이우종(Lee, Wujong) ; 조현식(Jo, Hyunsik) ; 이학주(Lee, Hak Ju) ; 차한주(Cha, Hanju) |
| DOI |
https://doi.org/10.5370/KIEE.2013.62.2.201 |
| Keywords |
Microgrid ; Grid-connected ; Stand-alone ; PLL Synchronization |
| 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. |