Current Limiting Control With Enhanced Dynamics of Grid-Forming Converters During Fault Conditions

By Mads Graungaard Taul, Xiongfei Wang, Pooya Davari, Frede Blaabjerg. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020

387 citations recorded by the source corpus.

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.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/193303b24dde7b429644b04320cc89067cee352e

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Citations in the corpus

Grid Forming Inverter Modeling, Control, and Applications (2021, methodology): “13, can be integrated into the control in the fault recovery process to suppress the poor transients [96].”
Frequency Stability of Synchronous Machines and Grid-Forming Power Converters (2020, background): “While numerous different strategies have been proposed to limit the ac current injection of voltage source converters with grid-forming controls [26], [33], [35]–[39] the problem of designing a robust ac current limitation strategy that effectively reacts to the load-induced over-current and grid fa”
Grid-Synchronization Stability of Converter-Based Resources—An Overview (2020, background): “One implementation of this is given in [86], where a grid-forming fault-mode controller including converter current limitation is reported.”