Voltage balancing in a 1-level modular multilevel matrix converter

LI Yao; XU Lie; LI Yongdong

doi:10.16511/j.cnki.qhdxxb.2017.21.031

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (11) : 1220-1227. DOI: 10.16511/j.cnki.qhdxxb.2017.21.031

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Voltage balancing in a 1-level modular multilevel matrix converter

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Abstract

A modular multilevel matrix converter (MMMC) can convert three phase AC input to three phase AC output. The converters use four-quadrant operation with good modularity and low frequency performance for high-voltage high-power variable frequency drive systems. MMMC designs include the topology without branch inductors and the topology with branch inductor. The MMMC without branch inductors are smaller and lighter.This paper describes a 1-level MMMC with the voltage of the H-bridge branches calculated numerically. The switching times are optimized to balance the voltages in the H-bridge branches. Tests show the effectiveness of the voltage balancing strategy.

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modular multilevel matrix converter (MMMC) / optimal switching times / voltage balance

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LI Yao, XU Lie, LI Yongdong. Voltage balancing in a 1-level modular multilevel matrix converter[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(11): 1220-1227 https://doi.org/10.16511/j.cnki.qhdxxb.2017.21.031

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