Influence of third harmonic injection on MMC-based HVDC transmission systems

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Li, Rui and Fletcher, John E. and Williams, Barry W. (2016) Influence of third harmonic injection on MMC-based HVDC transmission systems. IET Generation, Transmission and Distribution, 10 (11). pp. 5764-2770. ISSN 1751-8695 (https://doi.org/10.1049/iet-gtd.2015.1470)

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Abstract

Whilst third harmonic injection is extensively used in modular multilevel converter (MMC) control, its significant advantages over sinusoidal modulation have not been fully explored. This paper evaluates the influence of third harmonic injection on system power losses, submodule capacitance, circulating current, and fault current and mathematical models are derived. Station conduction losses are reduced by 11%, yielding higher efficiency and lowering cooling system capacity. The submodule capacitance is reduced by 24%, which significantly lowers the capital cost, weight, and volume of the station converter. Additionally, the phase energy variation is reduced by around 18%, which benefits circulating current control. Due to the lower AC currents, the semiconductor current stresses are correspondingly reduced. In addition to the performance improvement in normal operation, the third harmonic injection reduces the DC fault currents by 13.4% and thus the fault current stresses on semiconductors and DC circuit breakers are lowered. Simulation of a point-to-point HVDC system demonstrates the effectiveness of the above analysis.

ORCID iDs

Li, Rui ORCID logoORCID: https://orcid.org/0000-0001-8990-7546, Fletcher, John E. and Williams, Barry W.;
  • Item type:Article
    ID code:56404
    Dates:
    Date
    Event
    4 August 2016
    Published
    6 May 2016
    Accepted
    Notes:This paper is a postprint of a paper submitted to and accepted for publication in IET Generation, Transmission and Distribution and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:17 May 2016 10:50
    Last modified:19 Dec 2024 01:18
    URI:https://strathprints.strath.ac.uk/id/eprint/56404
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