Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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71% Common-mode voltage suppression modulation strategy for indirect matrix converters

  • Shanhu Li (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology) ;
  • Zijing Lu (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology) ;
  • Sunpeng Cao (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology) ;
  • Xu Liu (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology) ;
  • Zhaoyang Jin (Department of Electrical Engineering and Bioscience, School of Advanced Science and Engineering, Waseda University) ;
  • Weitao Deng (School of Information Science and Engineering, Hunan Institute of Science and Technology)
  • Received : 2022.06.22
  • Accepted : 2022.09.15
  • Published : 2023.02.20
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Abstract

Common-mode voltage (CMV) with a high amplitude and frequency is generated when an indirect matrix converter (IMC) is operating, which damages the motor winding insulation and accelerates motor aging. Existing IMC modulation methods can only suppress the CMV by 42.3%. However, this paper proposes a modulation strategy with a 71% reduction in the peak CMV. The proposed method selects active vectors based on the characteristics of the CMV amplitude under each of the active vectors. The rectifier stage selects two active vectors within each modulation sector. According to the sector where the input reference current vector is located, the inverter stage chooses active-voltage vectors whose corresponding peak CMV is 1/3 the minimum peak line voltage for modulation. Moreover, the CMV spikes caused by the dead zone effect are eliminated by reasonably arranging the switching sequence of the voltage vectors in the inverter stage. The proposed approach considerably lowers the peak CMV and has a good suppression effect on the amplitude of high-frequency CMV. Finally, experimental results illustrate the CMV reduction efficiency of the modulation strategy.

Keywords

Acknowledgement

This research was funded by National Natural Science Foundation of China, Grant nos [52207052 51907049], The Central Guidance on Local Science and Technology Development Fund of Hebei Province, Grant no [226Z1805G], Natural Science Foundation of Hebei Province, Grant no [E2020202095].

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