Interlink Converter with Linear Quadratic Regulator Based Current Control for Hybrid AC/DC Microgrid
AbstractA 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
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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.
Aryani DR, Kim J-S, Song H. Interlink Converter with Linear Quadratic Regulator Based Current Control for Hybrid AC/DC Microgrid. Energies. 2017; 10(11):1799.Chicago/Turabian Style
Aryani, Dwi R.; Kim, Jung-Su; Song, Hwachang. 2017. "Interlink Converter with Linear Quadratic Regulator Based Current Control for Hybrid AC/DC Microgrid." Energies 10, no. 11: 1799.
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