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Droop Control for Parallel Inverers in Islanded Microgrid Considering Unbalanced Low-Voltage Line Impedances

마이크로그리드 독립 운전 모드시 저전압 불평형 선로 임피던스를 고려한 드룹 방식의 인버터 병렬 운전 제어 연구

  • Lim, Kyung-Bae (Dept. of Electrical Eng., Chungbuk National University) ;
  • Choi, Jaeho (Dept. of Electrical Eng., Chungbuk National University)
  • Received : 2013.02.08
  • Accepted : 2013.04.22
  • Published : 2013.08.20

Abstract

This paper investigates the droop control of parallel inverters for an islanded mode of microgrid. Frequency and voltage droop control is one of power control and load demand sharing methods. However, although the active power is properly shared, the reactive power sharing is inaccurate with conventional method due to the unequal line impedances and the power coupling of active - reactive power. In order to solve this problem, an improved droop method with virtual inductor concept and a voltage and current controller properly designed have been considered and analyzed through the PSiM simulation. The performance of improved droop method is analyzed in not only low-voltage line but also medium voltage line.

Keywords

References

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