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Energies 2014, 7(10), 6477-6491; doi:10.3390/en7106477

Voltage Control Scheme with Distributed Generation and Grid Connected Converter in a DC Microgrid

1
Department of Electrical Engineering, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Korea
2
Department of Electrical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
3
Department of Electrical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Korea
*
Author to whom correspondence should be addressed.
Received: 20 March 2014 / Revised: 19 September 2014 / Accepted: 25 September 2014 / Published: 10 October 2014
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Abstract

Direct Current (DC) microgrids are expected to become larger due to the rapid growth of DC energy sources and power loads. As the scale of the system expends, the importance of voltage control will be increased to operate power systems stably. Many studies have been performed on voltage control methods in a DC microgrid, but most of them focused only on a small scale microgrid, such as a building microgrid. Therefore, a new control method is needed for a middle or large scale DC microgrid. This paper analyzes voltage drop problems in a large DC microgrid and proposes a cooperative voltage control scheme with a distributed generator (DG) and a grid connected converter (GCC). For the voltage control with DGs, their location and capacity should be considered for economic operation in the systems. Accordingly, an optimal DG allocation algorithm is proposed to minimize the capacity of a DG for voltage control in DC microgrids. The proposed methods are verified with typical load types by a simulation using MATLAB and PSCAD/EMTDC. View Full-Text
Keywords: voltage control; DC microgrid; distributed generation; optimal allocation; battery energy storage system voltage control; DC microgrid; distributed generation; optimal allocation; battery energy storage system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Choi, J.-C.; Jeong, H.-Y.; Choi, J.-Y.; Won, D.-J.; Ahn, S.-J.; Moon, S.-I. Voltage Control Scheme with Distributed Generation and Grid Connected Converter in a DC Microgrid. Energies 2014, 7, 6477-6491.

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