A Robust Suboptimal Current Control of an Interlink Converter for a Hybrid AC/DC Microgrid

Ismi Rosyiana Fitri, Jung-Su Kim and Hwachang Song
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Ismi Rosyiana Fitri: Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
Jung-Su Kim: Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
Hwachang Song: Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea

Energies, 2018, vol. 11, issue 6, 1-15

Abstract: A hybrid AC/DC microgrid is established with the aim of exploiting numerous types of renewable energy to meet the needs of different loads. The microgrid is decomposed by AC DC sub-grids which are connected by an interlink converter (IC). To maintain the security and reliability of the microgrid, an automatic controller for the interlink converter is needed. In this paper, we propose a Linear Matrix Inequalities (LMI)-based current control method for the interlink converter. As the main features here, the interlink converter permits bidirectional power exchange between both sub-grids when a power–demand imbalance occurs in one sub-grid regardless of the converter system parameters. Simulations with various filter parameters are performed using the Matlab/Simulink software to validate the effectiveness of the proposed controller. In comparison with the existing Linear Quadratic Regulator (LQR)-based current control, the proposed method is more robust against unknown system parameters and high load perturbation.

Keywords: bidirectional AC-DC converter; current control; hybrid microgrid; interlink converter; LQR (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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