Current Limiting Control with Enhanced Dynamics of Grid-Forming Converters during Fault Conditions

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Abstract

With an increasing capacity in the converter-based generation to the modern power system, a growing demand for such systems to be more grid-friendly has emerged. Consequently, grid-forming converters have been proposed as a promising solution as they are compatible with the conventional synchronous-machine-based power system. However, most research focuses on the grid-forming control during normal operating conditions without considering the fundamental distinction between a grid-forming converter and a synchronous machine when considering its short-circuit capability. The current limitation of grid-forming converters during fault conditions is not well described in the available literature and present solutions often aim to switch the control structure to a grid-following structure during the fault. Yet, for a future converter-based power system with no or little integration of synchronous machines, the converters need to preserve their voltage-mode characteristics and be robust toward weak-grid conditions. To address this issue, this article discusses the fundamental issue of grid-forming converter control during grid fault conditions and proposes a fault-mode controller which keeps the voltage-mode characteristics of the grid-forming structure while simultaneously limiting the converter currents to an admissible value. The proposed method is evaluated in a detailed simulation model and verified through an experimental test setup.

Original languageEnglish
Article number8779657
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume8
Issue number2
Pages (from-to)1062-1073
Number of pages12
ISSN2168-6777
DOIs
Publication statusPublished - Jun 2020

Keywords

  • Grid-Connection
  • Voltage-Source Converter
  • Grid-Forming Control
  • Fault Ride-Through
  • Current limitation

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