The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Power Balancing Strategy in the Microgrid During Transient

마이크로그리드 과도상태 시 전력 수급 균형 전략

  • 서재진 ((주)효성 중공업연구소 솔루션기술팀) ;
  • 이학주 (전력연구원(KEPRI)) ;
  • 정원욱 (전력연구원(KEPRI)) ;
  • 원동준 (인하대학교 IT공과대학 전기공학부)
  • Received : 2009.11.27
  • Accepted : 2010.02.12
  • Published : 2010.04.01
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Abstract

When problems such as line fault, breakdown of a substation or a generator, etc. arise on the grid, the Microgrid is designed to be separated or isolated from the grid. Most existing DGs(Distributed Generators) in distribution system use rotating machine. However, new DGs such as micro gas turbine, fuel cell, photo voltaic, wind turbine, etc. will be interfaced with the Microgrid through an inverter. So the Microgrid may have very lower inertia than the conventional distribution system. By the way, the rate of change of frequency depends on the inertia of the power system. Moreover, frequency has a strong coupling with active power in power system. Because the frequency of the Microgrid may change rapidly and largely during transient, appropriate and fast control strategy is needed for stable operation of the Microgrid. Therefore, this paper presents a power balancing strategy in Microgrid during transient. Despite of strong power or frequency excursions, power balancing in the Microgrid can be maintained.

Keywords

References

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