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Energies 2017, 10(6), 822; doi:10.3390/en10060822

Multi-Frequency Control in a Stand-Alone Multi-Microgrid System Using a Back-To-Back Converter

Department of Electrical Engineering, Incheon National University, Songdo-dong, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Wenxin Liu
Received: 4 May 2017 / Revised: 7 June 2017 / Accepted: 13 June 2017 / Published: 17 June 2017
(This article belongs to the Special Issue Advanced Operation and Control of Smart Microgrids)

Abstract

A stand-alone multi-microgrid (MMG) system can be formed by connecting multiple stand-alone microgrids (MGs). In the stand-alone MMG system where the frequencies of each MG system are different, a back-to-back (BTB) converter can be used for interconnecting the adjacent MG system. The frequency control performance of the MMG system can be improved by designing the suitable controller of the BTB converter. This study proposes a multi-frequency control in the BTB converter to improve the performance of frequency regulation in the MMG system. Autonomous power sharing between each MG system is achieved by using the proposed multi-frequency control. The stand-alone MMG system where two stand-alone MG systems with different nominal frequencies are interconnected using the BTB converter is simulated in this study to show the feasibility of the proposed multi-frequency controller. Each stand-alone MG system consists of an inverter-based distributed generator (DG) that uses a grid-forming converter with a conventional frequency droop controller. The inverter-based DG is responsible for the primary frequency control in each MG system. To show the effectiveness of the proposed multi-frequency control, a comparison study of the multi-frequency control and the single frequency control is presented in this study. Simulation results show that the system stability can be improved by using the proposed multi-frequency controller. View Full-Text
Keywords: interconnecting microgrids; stand-alone multi-microgrid system; multi-frequency control interconnecting microgrids; stand-alone multi-microgrid system; multi-frequency control
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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

Yoo, H.-J.; Nguyen, T.-T.; Kim, H.-M. Multi-Frequency Control in a Stand-Alone Multi-Microgrid System Using a Back-To-Back Converter. Energies 2017, 10, 822.

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