Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Three-phase three-level four-leg NPC converters with advanced model predictive control

  • Roh, Chan (School of Electrical and Electronics Engineering, Chung-Ang University) ;
  • Kwak, Sangshin (School of Electrical and Electronics Engineering, Chung-Ang University) ;
  • Choi, Seungdeog (Department of Electrical and Computer Engineering, Mississippi State University)
  • Received : 2021.06.04
  • Accepted : 2021.06.30
  • Published : 2021.10.20
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Abstract

This paper presents a computational reduction algorithm for applying model predictive control to a three-level four-leg converter. An optimal switching state is selected by only considering 7 voltage vectors located near the reference voltage vector, rather than using 81 voltage vectors in every sampling period, as in the conventional method. The sector, prism, and tetrahedron are sequentially selected using the position of the reference voltage vector. In addition, the seven voltage vectors selected in advance are the vectors constituting the selected tetrahedron. Thus, the proposed method reduces the computational cost and provides an improved model predictive control that does not affect the performance. The proposed method comprises an experimental setup of the proposed three-level four-leg converter to compare its performance with that of the conventional method.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C1013413) and the Korea Electric Power Corporation (Grant number: R21XA01-3).

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