A branch current reallocation based energy balancing strategy for the modular multilevel matrix converter operating around equal frequency

Fan, Boran; Wang, Kui; Gu, Chunyang; Wheeler, Patrick; Li, Yongdong

Abstract

Modular multilevel matrix converter (M3C) is a promising topology for medium-voltage high-power applications. Due to the modular structure, it features easy scalability, high quality output waveforms and superior fault tolerance. However, M3C suffers serious capacitor-voltage fluctuation if the output frequency gets closer to the input frequency. This limits its use in the adjustable-speed-drive (ASD) applications. This paper introduces a theoretical analysis in phasor-domain to find the branch energy equilibrium point of M3C when operating around equal frequency. On the basis of this equilibrium point, a branch current reallocation based energy balancing control method is proposed to equalize the energy stored in the nine converter branches. With this novel control method, M3C can effectively overcome the capacitor voltage fluctuation with neither using common voltage nor applying reactive power at the input side.

Citation

Fan, B., Wang, K., Gu, C., Wheeler, P., & Li, Y. (2018). A branch current reallocation based energy balancing strategy for the modular multilevel matrix converter operating around equal frequency. IEEE Transactions on Power Electronics, 33(2), 1105-1117. https://doi.org/10.1109/TPEL.2017.2685431

• Journal Article Type: Article
• Acceptance Date: Mar 6, 2017
• Online Publication Date: Mar 21, 2017
• Publication Date: Feb 28, 2018
• Deposit Date: Jan 23, 2018
• Publicly Available Date: Jan 23, 2018
• Journal: IEEE Transactions on Power Electronics
• Print ISSN: 0885-8993
• Electronic ISSN: 1941-0107
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 33
• Issue: 2
• Pages: 1105-1117
• DOI: https://doi.org/10.1109/TPEL.2017.2685431
• Keywords: modular multilevel matrix converter (M3C); energy and balancing control; equal frequency
• Public URL: https://nottingham-repository.worktribe.com/output/917123
• Publisher URL: http://ieeexplore.ieee.org/document/7883960/
• Additional Information: c2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works