Power Oscillation Damping using VSC-based Multi-terminal HVDC grids

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    Abstract

    This paper presents a Power Oscillation Damping (POD) controller for use with Voltage Source Converter based Multi-terminal Direct Current (VSC-MTDC) grids. The controller has been tested on a large meshed AC network into which a five bus, six line VSC-MTDC network has been incorporated. The controller is designed using a Modal Linear Quadratic Gaussian (MLQG) approach allowing targeted control action on critical low-frequency oscillatory modes. By taking multiple delayed wide area signals and modulating active power injection by multiple VSC-MTDC converter stations, significant improvement in system stability is seen. The effect of blocking the POD controller's active power modulation signals to specific VSC-MTDC converter stations is assessed. Such a blocking feature may be desirable at points of connection with weak AC networks which might be temporarily unable to tolerate modulation in active power injection and instead require a fast return to steady state constant power injection. Even with modulation signals blocked, the post disturbance system performance is significantly enhanced, demonstrating the redundancy in using VSC-MTDC for oscillation damping. The controller performance has been assessed through both small and large disturbance analysis.
    Original languageEnglish
    Title of host publicationIFAC Proceedings Volumes (IFAC-PapersOnline)|IFAC Proc. Vol. (IFAC-PapersOnline)
    Pages20-25
    Number of pages5
    Volume8
    DOIs
    Publication statusPublished - 2012
    Event8th Power Plant and Power System Control Symposium, PPPSC 2012 - Toulouse
    Duration: 1 Jul 2012 → …

    Conference

    Conference8th Power Plant and Power System Control Symposium, PPPSC 2012
    CityToulouse
    Period1/07/12 → …

    Keywords

    • Electromechanical modes
    • LQG control
    • MTDC
    • Power oscillation damping
    • VSC-HVDC
    • WAMS

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