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http://dx.doi.org/10.5370/KIEE.2011.60.6.1112

Study on the Dynamic Synchronizing Control of An Islanded Microgrid  

Cho, Chang-Hee (한국전기연구원)
Jeon, Jin-Hong (한국전기연구원)
Kim, Jong-Yul (한국전기연구원)
Kwon, Soon-Man (한국전기연구원)
Kim, Sung-Shin (부산대 공대 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.60, no.6, 2011 , pp. 1112-1121 More about this Journal
Abstract
A microgrid is an aggregation of multiple distributed generators (DGs) such as renewable energy sources, conventional generators, and energy storage systems that provide both electric power and thermal energy. Generally, a microgrid operates in parallel with the main grid. However, there are cases in which a microgrid operates in islanded mode, or in a disconnected state. Islanded microgrid can change its operational mode to grid-connected operation by reconnection to the grid, which is referred to as synchronization. Generally, a single machine simply synchronizes with the grid using a synchronizer. However, the synchronization of microgrid that operate with multiple DGs and loads cannot be controlled by a traditional synchronizer, but needs to control multiple generators and energy storage systems in a coordinated way. This is not a simple job, considering that a microgrid consists of various power electronics-based DGs as well as alternator-based generators that produce power together. This paper introduces the results of research examining an active synchronizing control system that consists of the network-based coordinated control of multiple DGs. Consequently, it provides the microgrid with a deterministic and reliable reconnection to the grid. The proposed method is verified by using the test cases with the experimental setup of a microgrid pilot plant.
Keywords
Microgrid; Synchronization; Static transfer switch; Energy storage system; Microgrid central controller;
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