Voltage Stability Monitoring Methods for Distribution Grids Using The Thevenin Impedance

Research output: Contribution to conferencePaper

Abstract

This paper focuses on a method to monitor voltage stability in sub-transmission grids with a real-time calculation of the Thevenin impedance seen from the concerned bus requiring only information of the system topology, PMU and SCADA data. The voltage stability status is assessed by an impedance stability index (ISI) and a power stability index (SSI) based on the maximum power transfer to the load according to the Thevenin theorem. Due the influence of the nonlinear behaviour of generation units, especially synchronous generators, it is necessary to adjust the magnitude of the calculated Thevenin impedance according to their operational status. This problem is approached by adding an additional impedance at the generator bus, whereby its magnitude is calculated with two algorithms. The validation and a comparison of these algorithms is achieved by simulations with IEEE-9-bus-network topology.
Original languageEnglish
DOIs
Publication statusPublished - 2017
EventCIRED 2017 - Glasgow, United Kingdom
Duration: 12 Jun 201715 Jun 2017

Conference

ConferenceCIRED 2017
CountryUnited Kingdom
CityGlasgow
Period12/06/1715/06/17

Keywords

  • in impedance, voltage stability, influence of generator capability

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  • Projects

    NetzReg - Optimum Grid Control

    Polster, S. C.

    1/08/1731/07/20

    Project: Research project

    Activities

    • 1 Poster presentation
    • 1 Talk at conference or symposium

    Voltage Stability Monitoring Methods for Distribution Grids Using The Thevenin Impedance

    Stefan Christian Polster (Speaker)
    Jun 2017

    Activity: Talk or presentationPoster presentationScience to science

    Voltage Stability Monitoring Methods for Distribution Grids Using The Thevenin Impedance

    Stefan Christian Polster (Speaker)
    Jun 2017

    Activity: Talk or presentationTalk at conference or symposiumScience to science

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