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

The Modular multilevel matrix converter (M3C) is a promising topology for medium-voltage, high-power applications. Due to the modular structure, it is scalable, produces high quality output waveforms and can be fault tolerant. However, the M3C suffers from capacitor-voltage fluctuation if the output frequency is similar to the input frequency. This problem could limit the circuit’s application in the adjustable speed drives (ASD). This paper introduces a theoretical analysis in the phasor-domain to find the branch energy equilibrium point of the M3C when operating with equal input and output frequencies. 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, the M3C can effectively overcome the capacitor voltage fluctuation without using balancing techniques based on common mode voltage or applying reactive power at the input side.

Citation

Fan, B., Wang, K., Gu, C., Wheeler, P., & Li, Y. (2016). A branch current reallocation based energy balancing strategy for the modular multilevel matrix converter operating around equal frequency

• Conference Name: 42nd Annual Conference of IEEE Industrial Electronics Society (IECON 2016)
• Start Date: Oct 25, 2016
• End Date: Oct 27, 2016
• Acceptance Date: Jun 27, 2016
• Publication Date: Oct 25, 2016
• Deposit Date: Feb 8, 2017
• Publicly Available Date: Feb 8, 2017
• Peer Reviewed: Peer Reviewed
• Keywords: Modular multilevel matrix converter (M3C); Energy and balancing control; Equal frequency
• Public URL: http://eprints.nottingham.ac.uk/id/eprint/40442
• Publisher URL: http://ieeexplore.ieee.org/document/7792966/
• Related Public URLs: http://www.iecon2016.org/
• Additional Information: © 2016 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.