KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Analysis of Voltage Control of Stand-Alone Microgrid for High Quality Power Supply

고품질 전력공급을 위한 독립형 마이크로그리드의 전압제어 해석

  • Jo, Jongmin (Dept. of Electrical Engineering, Chungnam National University) ;
  • Lee, Hakju (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Shin, Chang-hoon (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Cha, Hanju (Dept. of Electrical Engineering, Chungnam National University)
  • Received : 2016.02.29
  • Accepted : 2016.04.19
  • Published : 2016.06.30
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Abstract

This paper analyzes voltage control method in order to supply high-quality power for stand-alone microgrid. Stand-alone microgrid is composed of battery bank, stand-alone PCS and controllable loads. The main role of stand-alone PCS is to supply high-quality power to loads as main source by using stable voltage method regardless of load conditions. In particularly, output voltage of stand-alone PCS gets severely unbalanced voltage under unbalanced loads. Fundamental positive and negative sequences are transformed by two coordinates transformation which are rotated in each opposite direction, respectively. Each fundamental d-q voltage is regulated by each fundamental PI control. In addition, low-order harmonics are compensated through resonant controllers. Performance of stand-alone microgrid is tested for feasibility, and it is verified that output voltage of THD is improved to 1% from 2.2% under 50 kW balanced load, and is improved to 1.1% from 2.6% under 50 kW unbalanced load.

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References

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