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http://dx.doi.org/10.5370/KIEE.2015.64.6.864

The Coordination Control of DC Microgrid on the Whole Operation Range  

Choi, Daehee (Dept. of Electrical Engineering, Tsinghua University, China, Hyosung Corporation)
Zhu, Shou-Zhen (Dept. of Electrical Engineering, Tsinghua University)
Min, Yong (Dept. of Electrical Engineering, Tsinghua University)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.64, no.6, 2015 , pp. 864-871 More about this Journal
Abstract
Recently, one of the main research on the power distribution system is the microgrid. The microgrid is a combination of power sources and loads, which is controllable and has separable connection. The main objective of microgrid is the deployment of the renewable clean energy and the enhancement of load-side reliability. The modern power sources and loads have DC I/O interfaces, which is the major advantage of DC microgrid compared to the conventional AC grid. The components in the microgrid have diverse features, so there is need of proper coordination control. For achieving economic feature, the active power of renewable energy resources is regarded as major control parameter and the whole operation modes of DC microgrid are defined, and the proper operations of each component are described. From the inherent characteristics of DC, there are two control variables: voltage and active power. Through analysis of operation modes, it is possible to determine exact control objectives and optimized voltage & power control strategy in each mode. Because of consideration of whole operation modes, regardless of the number and capacity of components, this coordination control method can be used without modification. This paper defines operation mode of DC microgrid with several DC sources and suggests economic and efficient coordinated control methods. Simulation with PSCAD proves effectiveness.
Keywords
Smartgrid; DC Microgrid; Coordination Control; DER;
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