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Simple Solution to Overcome Fault Recovery Issues of Grid-Forming Inverter With Current Limiter
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DOI：10.1109/TPEL.2025.3649588.png)
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Abstract
En 中文
Grid-forming inverters with priority current limiter suffer the fault recovery issue, commonly manifested as the failure to exit from current limitation after fault clearance. To overcome this issue, this article proposes a virtual power <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">P</i><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">IVS</sub>-feedback method. This method employs the virtual power of the internal voltage source <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">P</i><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">IVS</sub> as power feedback, rather than relying on the actual output power <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">P</i><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</sub>. The inherent fault recovery issue of priority current limiters can be well-solved in this simple yet efficient way. Furthermore, the proposed universal virtual power <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">P</i><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">IVS</sub>-feedback framework can be expanded from a specific case of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</i>-axis priority current limiter to other cases of circular current limiters. Besides, a comparative study of typical virtual power feedback methods shows the feasibility and superior applicability of the proposed method. Compared to existing methods, the proposed method eliminates the necessity for complex control design, additional line or grid information, and control structure reconfiguration. Comprehensive theorical analysis and hardware-in-loop experiments verify the effectiveness of the proposed method.
Keywords:
Current limitation
current limiter
fault recovery
grid-forming (GFM) control
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6.5
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8.3W
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