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

3상 인버터의 계통연계 및 독립운전모드 전환 연구

  • 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)
  • Received : 2012.08.10
  • Accepted : 2012.12.06
  • Published : 2013.02.01

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.

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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