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A novel bridgeless flying capacitor multilevel rectifier
  • +3
  • Yaopu Li,
  • Hong Cheng,
  • Cong Wang,
  • Zhihao Zhao,
  • Wei Yuan,
  • Jun Wang
Yaopu Li
China University of Mining and Technology - Beijing

Corresponding Author:li.yaopu@hotmail.com

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Hong Cheng
China University of Mining and Technology - Beijing
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Cong Wang
China University of Mining and Technology - Beijing
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Zhihao Zhao
China University of Mining and Technology - Beijing
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Wei Yuan
China University of Mining and Technology - Beijing
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Jun Wang
Beijing Polytechnic College
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Abstract

A novel transformerless three-phase unidirectional bridgeless flying capacitor (UBFC) rectifier for medium-voltage and high-voltage applications is presented by this paper. The rectifier consists of three single-phase rectifiers in wye connection, the DC outputs of the three single-phase rectifiers are connected in parallel to provide a high common DC-link bus which makes it convenient to connect with NPC or FC multilevel inverters. To avoid phase to phase current circulation, an additional inductor and diode are added to each single-phase rectifier. Compared with conventional bidirectional multilevel converters, only half IGBTs are employed with lower voltage stress, line-frequency transformers are no longer be required, which makes the proposed rectifier has a series of advantages such as reduced cost, simplified control complexity, increased reliability and improved overall efficiency. The basic operating principle of the proposed rectifier in continuous conduction mode is discussed, an improved carrier-based level-shifted PWM modulation method integrated with voltage balancing and the double closed-loop control strategy are proposed to achieve more voltage levels and keep the flying capacitors in balance. The feasibility of proposed rectifier is verified by the simulation as well as experimental results.
04 Apr 2023Submitted to International Journal of Circuit Theory and Applications
05 Apr 2023Review(s) Completed, Editorial Evaluation Pending
05 Apr 2023Submission Checks Completed
05 Apr 2023Assigned to Editor
06 Apr 2023Reviewer(s) Assigned
26 May 2023Editorial Decision: Revise Minor
04 Jul 20231st Revision Received
10 Jul 2023Submission Checks Completed
10 Jul 2023Assigned to Editor
10 Jul 2023Review(s) Completed, Editorial Evaluation Pending
14 Jul 2023Reviewer(s) Assigned
19 Jul 2023Editorial Decision: Accept