Dynamics of inverter-based resources in weak distribution grids

Mehdi Ghazavi Dozein, Bikash C. Pal, Pierluigi Mancarella

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

This work presents the modelling fundamentals to study the dynamics of inverter-based resources (IBRs) in weak distribution grids and derive disturbance performance characteristics describing how they should behave under different conditions. More specifically, with respect to small-signal disturbances we study the possible voltage violations following frequency response from IBRs due to low system strength and also propose specific design requirements for IBR d-q current control to guarantee a stable response. In the context of large-signal disturbances, we highlight how active power-voltage control may not be effective due to a delay imposed by the physical features of the distribution network. Further, we mathematically discuss how IBR reactive power control could enhance its phase-locked loop stability. The proposed disturbance performance characteristics are then integrated into the IBR converter control via a novel voltage-priority reference generation strategy. Simulation results on a real Australian network show the efficacy of the proposed operational and control design requirements, and highlight possible unexpected active/reactive power interactions in weak distribution grids.

Original languageEnglish
Pages (from-to)3682-3692
Number of pages11
JournalIEEE Transactions on Power Systems
Volume37
Issue number5
DOIs
Publication statusPublished - Sept 2022
Externally publishedYes

Keywords

  • Disturbance performance characteristics
  • dynamic supports
  • IBR stability
  • inverter-based resources
  • system strength
  • weak distribution grids

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