Dynamic resonance analysis and oscillation damping of multiterminal DC grids

Liu, Yuchao and Raza, Ali and Rouzbehi, Kumars and Li, Binbin and Xu, Dianguo and Williams, Barry W. (2017) Dynamic resonance analysis and oscillation damping of multiterminal DC grids. IEEE Access, 5. pp. 16974-16984. ISSN 2169-3536 (https://doi.org/10.1109/ACCESS.2017.2740567)

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Abstract

Voltage source converter (VSC) based multi-terminal high voltage direct current (VSC-MTDC) systems/grids are prone to system instability. This critical issue is overlooked in literature. In order to improve the system stability, this paper proposes an effective active damping method as a remedy to suppress voltage and power resonances in the VSC-MTDC grids by injecting damping signals into the inner current loops of VSC-MTDC stations. With dynamic regulation of the damping current, resonance is suppressed by power converter controllers without any additional current and voltage measurement. In this study, modeling and stability analysis of VSC-MTDC system/grid is presented considering the dc-side energy storage components, and control with a droop control structure. Then, single-frequency and multi-frequency resonance mechanisms of dc-bus voltage and power in the event of transients are analyzed. Later, stability effect of MTDC system/grid inductance and capacitance values to the resonance amplitude and frequency droop coefficients is investigated. A PSCAD/EMTDC platform is developed to conduct dynamic simulations, and a scaled-down four-terminal 20 kW experimental prototype is used to validate the effectiveness of proposed control methodology.

  • Item type:Article
    ID code:61855
    Dates:
    Date
    Event
    27 August 2017
    Published
    5 August 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:26 Sep 2017 10:25
    Last modified:20 Nov 2024 01:14
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/61855
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