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Energies 2017, 10(11), 1799; https://doi.org/10.3390/en10111799

Interlink Converter with Linear Quadratic Regulator Based Current Control for Hybrid AC/DC Microgrid

Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
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Received: 26 September 2017 / Revised: 1 November 2017 / Accepted: 1 November 2017 / Published: 8 November 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

A hybrid alternate current/direct current (AC/DC) microgrid consists of an AC subgrid and a DC subgrid, and the subgrids are connected through the interlink bidirectional AC/DC converter. In the stand-alone operation mode, it is desirable that the interlink bidirectional AC/DC converter manages proportional power sharing between the subgrids by transferring power from the under-loaded subgrid to the over-loaded one. In terms of system security, the interlink bidirectional AC/DC converter takes an important role, so proper control strategies need to be established. In addition, it is assumed that a battery energy storage system is installed in one subgrid, and the coordinated control of interlink bidirectional AC/DC converter and battery energy storage system converter is required so that the power sharing scheme between subgrids becomes more efficient. For the purpose of designing a tracking controller for the power sharing by interlink bidirectional AC/DC converter in a hybrid AC/DC microgrid, a droop control method generates a power reference for interlink bidirectional AC/DC converter based on the deviation of the system frequency and voltages first and then interlink bidirectional AC/DC converter needs to transfer the power reference to the over-loaded subgrid. For efficiency of this power transferring, a linear quadratic regulator with exponential weighting for the current regulation of interlink bidirectional AC/DC converter is designed in such a way that the resulting microgrid can operate robustly against various uncertainties and the power sharing is carried out quickly. Simulation results show that the proposed interlink bidirectional AC/DC converter control strategy provides robust and efficient power sharing scheme between the subgrids without deteriorating the secure system operation. View Full-Text
Keywords: battery energy storage system; hybrid AC/DC microgrid; interlink bidirectional AC/DC converter; linear quadratic regulator; power sharing battery energy storage system; hybrid AC/DC microgrid; interlink bidirectional AC/DC converter; linear quadratic regulator; power sharing
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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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Aryani, D.R.; Kim, J.-S.; Song, H. Interlink Converter with Linear Quadratic Regulator Based Current Control for Hybrid AC/DC Microgrid. Energies 2017, 10, 1799.

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