Analysis and control of modular multilevel converters under asymmetric arm impedance conditions

Zeng, Rong and Xu, Lie and Yao, Liangzhong and Finney, Stephen J. (2016) Analysis and control of modular multilevel converters under asymmetric arm impedance conditions. IEEE Transactions on Industrial Electronics, 63 (1). pp. 71-81. ISSN 0278-0046

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    Abstract

    This paper presents a detailed analysis and improved control strategy for Modular Multilevel Converters (MMC) under asymmetric arm inductance conditions. Unlike symmetric conditions, the fundamental ac current is not split equally between the upper and lower arms under asymmetric conditions, and the dc and double-frequency components in the common-mode current also flow into the ac side. To solve these issues, a theoretical analysis of the effect of asymmetric conditions on MMC operation is carried out using equivalent circuits at different frequencies. Three control targets are then presented to enhance the operational performance. A control strategy providing the control of differential-mode current, common-mode current and power balance is designed. The feasibility and validity of the proposed analysis and control strategy are demonstrated by simulation results from a threephase MMC system, and simulation and experimental results from a single-phase MMC system.

    Author(s):Zeng, Rong, Xu, Lie ORCID logoORCID: https://orcid.org/0000-0001-5633-7866, Yao, Liangzhong and Finney, Stephen J. ORCID logoORCID: https://orcid.org/0000-0001-5039-3533
    Item type:Article
    ID code:54225
    Notes:(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, 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 components of this work in other works
    Keywords:modular multilevel converter, asymmetric conditions, common mode current, differential mode current, power balance, Electrical engineering. Electronics Nuclear engineering, Electrical and Electronic Engineering
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:08 Sep 2015 15:40
    Last modified:15 Nov 2019 05:46
    URI:https://strathprints.strath.ac.uk/id/eprint/54225
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