Improved two-level voltage source converter for high-voltage direct current transmission systems

Adam, Grain Philip and Abdelsalam, Ibrahim and Fletcher, John Edward and Xu, Lie and Burt, Graeme M. and Holliday, Derrick and Finney, Stephen (2017) Improved two-level voltage source converter for high-voltage direct current transmission systems. IEEE Journal of Emerging and Selected Topics in Power Electronics. ISSN 2168-6777 (https://doi.org/10.1109/JESTPE.2017.2723839)

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Abstract

this paper presents an improved two-level voltage source converter for dc transmission systems with relatively low rated power and dc operating voltage. Unlike conventional two-level converter, the presented converter employs two distributed cell capacitors per three-phase; thus, do not contribute any current when converter is blocked during dc short circuit fault as in modular multilevel converter case. The use of three-phase cells is proven to be beneficial because the arm currents do not contain 2nd order harmonic currents, and cell capacitors tend to be small as they only experience high-order harmonic current associated with the switching frequency. For the same rated dc link voltage and switching devices, the rated power of the improved two-level converter will be twice that of the conventional two-level converter. Average, switching function and electromagnetic transient simulation models of the improved two-level converter are discussed and validated against detailed switch model. The viability of the improved two-level converter for HVDC applications is examined, considering dc and ac short circuit faults. Besides, reduced complexity of the control and power circuit of the improved two-level converter, it has been found that its transient responses to ac and dc faults are similar to that of the modular multilevel converter.

ORCID iDs

Adam, Grain Philip ORCID logoORCID: https://orcid.org/0000-0002-1263-9771, Abdelsalam, Ibrahim, Fletcher, John Edward, Xu, Lie ORCID logoORCID: https://orcid.org/0000-0001-5633-7866, Burt, Graeme M. ORCID logoORCID: https://orcid.org/0000-0002-0315-5919, Holliday, Derrick ORCID logoORCID: https://orcid.org/0000-0002-6561-4535 and Finney, Stephen;
  • Item type:Article
    ID code:61330
    Dates:
    Date
    Event
    13 July 2017
    Published
    4 June 2017
    Accepted
    Notes:(c) 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:24 Jul 2017 08:57
    Last modified:11 Nov 2024 11:44
    URI:https://strathprints.strath.ac.uk/id/eprint/61330
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