Analysis and Criterion for Inherent Balance Capability in Modular Multilevel DC–AC–DC Converters

X. Xiang; Y. Qiao; Y. Gu; X. Zhang; T. C. Green

doi:10.1109/TPEL.2019.2954304

Analysis and Criterion for Inherent Balance Capability in Modular Multilevel DC–AC–DC Converters

X. Xiang, Y. Qiao, Y. Gu, X. Zhang, T. C. Green

Department of Electronic & Electrical Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

Modular multilevel dc-ac-dc converters (MMDAC) have emerged recently for high step-ratio connections in medium-voltage distribution systems. Extended phase-shift modulation has been proposed and was found to create the opportunity for inherent balance of submodule capacitor voltages. This letter presents fundamental analysis leading to clear criterion for the inherent balance capability in MMDAC. A sufficient and necessary condition, with associated assumptions, to guarantee this capability is established. Using the mathematics of circulant matrices, this condition is simplified to a coprime criterion which gives rise to practical guidance for the design of an MMDAC. Experiments on downscaled prototypes and simulations on full-scale examples both provide verification of the analysis and criterion for the inherent balance capability of MMDAC.

Original language	English
Article number	8906076
Pages (from-to)	5573-5580
Number of pages	8
Journal	IEEE Transactions on Power Electronics
Volume	35
Issue number	6
Early online date	19 Nov 2019
DOIs	https://doi.org/10.1109/TPEL.2019.2954304
Publication status	Published - 30 Jun 2020

Keywords

Circulant matrix
inherent voltage balance
low voltage dc (LVdc)
medium voltage dc (MVdc)
modular multilevel dc-ac-dc converters (MMDAC)

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/TPEL.2019.2954304

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https://spiral.imperial.ac.uk/handle/10044/1/75253

Cite this

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abstract = "Modular multilevel dc-ac-dc converters (MMDAC) have emerged recently for high step-ratio connections in medium-voltage distribution systems. Extended phase-shift modulation has been proposed and was found to create the opportunity for inherent balance of submodule capacitor voltages. This letter presents fundamental analysis leading to clear criterion for the inherent balance capability in MMDAC. A sufficient and necessary condition, with associated assumptions, to guarantee this capability is established. Using the mathematics of circulant matrices, this condition is simplified to a coprime criterion which gives rise to practical guidance for the design of an MMDAC. Experiments on downscaled prototypes and simulations on full-scale examples both provide verification of the analysis and criterion for the inherent balance capability of MMDAC.",

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PY - 2020/6/30

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Analysis and Criterion for Inherent Balance Capability in Modular Multilevel DC–AC–DC Converters

Abstract

Keywords

ASJC Scopus subject areas

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Analysis and Criterion for Inherent Balance Capability in Modular Multilevel DC–AC–DC Converters

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

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Fellowship - Grid-Supportive Power Electronics for Power System Security

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