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http://dx.doi.org/10.5370/KIEE.2010.59.4.707

Power Balancing Strategy in the Microgrid During Transient  

Seo, Jae-Jin ((주)효성 중공업연구소 솔루션기술팀)
Lee, Hak-Ju (전력연구원(KEPRI))
Jung, Won-Wook (전력연구원(KEPRI))
Won, Dong-Jun (인하대학교 IT공과대학 전기공학부)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.59, no.4, 2010 , pp. 707-714 More about this Journal
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
Microgrid; Distributed Generator; Power balancing; Frequency Droop Control, Controllable Load; Load shedding;
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