This letter develops an equivalent circuit model of a grid-forming (GFM) converter with a circular current limiter and analyzes its transient stability. It is revealed that the inner control loop can be simplified as a voltage source behind an equivalent resistor. Based on the developed model, theoretical analysis and experimental tests demonstrate that the transient stability of a$P-f$droop-controlled GFM converter with the circular current limiter can be assured whenever there exist stable equilibrium points.
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Fan et al. (2022) studied this question.
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