Enhanced independent pole control of hybrid MMC-HVDC system

Xiang, Wang and Ling, Weixing and Xu, Lie and Wen, Jingyu (2018) Enhanced independent pole control of hybrid MMC-HVDC system. IEEE Transactions on Power Delivery, 33 (2). pp. 861-872. ISSN 0885-8977 (https://doi.org/10.1109/TPWRD.2017.2715040)

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Abstract

This paper presents an enhanced independent pole control scheme for hybrid modular multilevel converter (MMC) based on full bridge sub-module (FBSM) and half bridge sub-module (HBSM). A detailed analysis of power distribution between upper and lower arms under asymmetrical DC pole voltages is presented. It is found that the fundamental AC currents in the upper and lower arms are asymmetrical. To enable operation under asymmetrical DC pole voltages, an enhanced independent pole control scheme is proposed. The controller is composed of two DC control loops, two AC control loops and circulating current suppression control based on current injection. Six modulation indices are presented to independently control the upper and lower arms. With this controller, the DC voltage operating region is significantly extended. To ride through pole to ground DC fault without bringing DC bias at the neutral point of interface transformer, a pole to ground DC fault ride through strategy is proposed. Feasibility and effectiveness of the proposed control scheme are verified by simulation results using PSCAD/EMTDC.

ORCID iDs

Xiang, Wang ORCID logoORCID: https://orcid.org/0000-0002-4619-5849, Ling, Weixing, Xu, Lie ORCID logoORCID: https://orcid.org/0000-0001-5633-7866 and Wen, Jingyu;
  • Item type:Article
    ID code:60885
    Dates:
    Date
    Event
    30 April 2018
    Published
    13 June 2017
    Published Online
    7 June 2017
    Accepted
    Notes:© 2017 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.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:09 Jun 2017 08:42
    Last modified:11 Nov 2024 11:43
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/60885
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