Enhanced multilevel modular converter with reduced number of cells and harmonic content

Vozikis, D. and Adam, G. and Rault, P. and Despouys, O. and Holliday, D. and Finney, S. (2019) Enhanced multilevel modular converter with reduced number of cells and harmonic content. IEEE Journal of Emerging and Selected Topics in Power Electronics. ISSN 2168-6777 (https://doi.org/10.1109/JESTPE.2019.2904205)

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Abstract

This paper presents an alternative implementation Several derivatives of modular multilevel converters that of a modular multilevel converter (MMC) that generates a large number of voltage levels per phase with high resolution voltage steps from a reduced number of cells per arm. The presented MMC employs a half-bridge chain-link of medium-voltage cells and a full-bridge chain-link of low-voltage cells in each of its arms. The total blocking voltage of the full-bridge chain-link is equivalent to half that of the medium-voltage half-bridge cell. The use of half and full-bridge cells with two distinct rated voltages in each arm permits full exploitation of the full-bridge cells to generate high resolution multilevel voltage waveforms with fine stepped transitions between major voltage steps of the medium-voltage half-bridge cells. In this manner, errors in the synthesis of the common-mode voltages of the three phase legs due to switching of the cell capacitors in and out the power path are reduced. The nested multilevel operation of the proposed MMC results in a number of voltage levels which is related to the product, rather than the sum, of the numbers of half and full-bridge cells. Detailed comparisons with existing MMC implementations show that the proposed MMC implementation offers the best design trade-offs (superior AC and DC waveforms with reduced control and power circuit complexity). The validity of the proposed MMC implementation is confirmed using simulations and experimentally.

  • Item type:Article
    ID code:67253
    Dates:
    Date
    Event
    11 March 2019
    Published
    11 March 2019
    Published Online
    4 March 2019
    Accepted
    Notes:© 2018 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.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:11 Mar 2019 16:40
    Last modified:21 Apr 2024 11:53
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/67253
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