A Branch Current Reallocation Based Energy Balancing Strategy for the Modular Multilevel Matrix Converter Operating Around Equal Frequency

Boran Fan, Kui Wang, Pat Wheeler, Chunyang Gu, Yongdong Li

Research output: Journal PublicationArticlepeer-review

37 Citations (Scopus)

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 and capable to produce high quality output waveforms and can be fault tolerant. However, the M3C suffers from low frequency capacitor voltage fluctuation if the output frequency is close to the input voltage frequency, which limits its application in adjustable speed drive fields. This paper presents a theoretical analysis in the phasor domain to find the branch-energy equilibrium point of the M3C when operating with equal input and output frequency first. Then, a branch energy balancing control method based on branch current reallocation is proposed to equalize the energy stored in the nine converter branches. With the proposed method, the M3C can effectively suppress the capacitor voltage fluctuation without injecting common-mode voltage or applying reactive power to the input side. Experimental results are presented to validate the proposed method.

Original languageEnglish
Article number7883960
Pages (from-to)1105-1117
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume33
Issue number2
DOIs
Publication statusPublished - Feb 2018
Externally publishedYes

Keywords

  • Energy and balancing control
  • equal frequency
  • medium-voltage high-power ASD
  • modular multilevel matrix converter (M3C)
  • triple-star bridge cells (TSBC) converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'A Branch Current Reallocation Based Energy Balancing Strategy for the Modular Multilevel Matrix Converter Operating Around Equal Frequency'. Together they form a unique fingerprint.

Cite this