Analysis and Design of an Air-Coupled DC Transformer with a Hybrid Modulation Control Method

Song Xu, Wei Jiang and Seiji Hashimoto
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Song Xu: Division of Electronic and Informatics, Gunma University, Kiryu 376-8515, Japan
Wei Jiang: Department of Electrical Engineering, Yangzhou University, N. 196 Huayang West Road, Yangzhou 225-000, China
Seiji Hashimoto: Division of Electronic and Informatics, Gunma University, Kiryu 376-8515, Japan

Energies, 2019, vol. 12, issue 13, 1-19

Abstract: DC micro-grid is gaining increasing attention recently due to its highly efficient energy utilization and flexible energy exchange capabilities. In this paper, an air-coupled DC–DC transformer is proposed for the interconnection between the active load and the DC microgrid. The generic problems in an air-coupled power transfer system without ferromagnetic structure are discussed. A bidirectional half-bridge topology is also proposed to suit the characteristics of the stationary load and to realize the bidirectional power transfer between the active DC load and the DC grid. A Hybrid Modulation Method (HMM) is proposed; the small signal model is derived and linear control techniques are applied to the forward power transfer control, and phase model control is applied to the reverse power transfer model. The open-loop system is simulated by PSIM to get the characteristics of the forward and reverse transfer model, and the closed system is built in the MATLAB/SIMULINK to verify the effect of the forward frequency control method and the reverse phase control method. The prototype is built with a dsPIC controller, tests are performed to evaluate the characteristics of the transformer and the power flow control of the bidirectional power transfer.

Keywords: DC micro-grid; wireless power transfer; DC–DC transformer; Hybrid Modulation Method; bidirectional power transfer (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: 2019
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