| Title |
Study on the Dynamic Synchronizing Control of An Islanded Microgrid |
| Authors |
조창희(Cho, Chang-Hee) ; 전진홍(Jeon, Jin-Hong) ; 김종율(Kim, Jong-Yul) ; 권순만(Kwon, Soon-Man) ; 김성신(Kim, Sung-Shin) |
| DOI |
https://doi.org/10.5370/KIEE.2011.60.6.1112 |
| Keywords |
Microgrid ; Synchronization ; Static transfer switch ; Energy storage system ; Microgrid central controller |
| 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. |