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Microgrid Systems

D07.5 - Fault Detection and Current Limitation Strategy for Grid-Forming Converters Under Balanced Faults

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
In this paper, the authors present a control strategy for grid-forming inverters that aims to detect short circuits, limit the output current of power converters, and improve the voltage unbalance index during fault conditions in islanded microgrids. An islanded microgrids was modeled, comprising one grid-following unit and two grid-forming generating units, each equipped with the proposed embedded algorithm. Short-circuit detection was based on the Teager-Kaiser Energy Operator, while current limitation was achieved through the application of virtual impedance with dynamically adjusted values for the positive-sequence components. The results demonstrated a fault detection time of just 0.2 ms, highlighting the effectiveness of the proposed method in rapidly identifying faults. Additionally, the current-limiting strategy successfully maintained current levels below the predefined threshold.