Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Three-phase flying-capacitor MMC with six coupled inductors

  • Le, Duc Dung (Department of Electrical Engineering, Yeungnam University) ;
  • Lee, Dong-Choon (Department of Electrical Engineering, Yeungnam University) ;
  • Kim, Heung-Geun (Department of Electrical Engineering, Kyungpook National University)
  • Received : 2020.02.11
  • Accepted : 2020.05.04
  • Published : 2020.07.20
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Abstract

In this paper, the design and integration of coupled inductors have been proposed for a flying-capacitor (FC) modular multilevel converter (MMC) for induction motor drive applications. In the conventional three-phase FC-MMC, twelve discrete inductors are needed for three legs. However, by integrating one coupled inductor with two windings in two half-arms, the number of inductors required is reduced from 12 to 6. Accordingly, the overall volumes and weights of cores and windings can be reduced by 41.7% and 41.4% when compared with discrete inductors. To confirm the validity of the proposed coupled inductor, a 4160-V/1-MW simulation model of a FC-MMC and a 220-V/3-kW scaled-down prototype have been built, of which performance for induction motor drives has been tested from standstill to the rated speed.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20194030202310).

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